Rename modules chapter to 28a

287 files changed, 0 insertions, 27677 deletions

diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/IterPeeps.java b/chapter-modules/src/main/java/com/seaofnodes/simple/IterPeeps.java
deleted file mode 100644
index e65ef6d9..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/IterPeeps.java
+++ /dev/null
@@ -1,349 +0,0 @@
-package com.seaofnodes.simple;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Opto;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.node.*;
-import java.util.Arrays;
-import java.util.BitSet;
-import java.util.IdentityHashMap;
-import java.util.Random;
-
-/**
- * The IterPeeps runs after parsing. It iterates the peepholes to a fixed point
- * so that no more peepholes apply.  This should be linear because peepholes rarely
- * (never?)  increase code size.  The graph should monotonically reduce in some
- * dimension, which is usually size.  It might also reduce in e.g. number of
- * MulNodes or Load/Store nodes, swapping out more "expensive" Nodes for cheaper
- * ones.
- * <br>
- * The theoretical overall worklist is mindless just grabbing the next thing and
- * doing it.  If the graph changes, put the neighbors on the worklist.
- * <br>
- * Lather, Rinse, Repeat until the worklist runs dry.
- * <p>
- * The main issues we have to deal with:
- *
- * <ul>
- * <li>Nodes have uses; replacing some set of Nodes with another requires more graph
- *   reworking.  Not rocket science, but it can be fiddly.  Its helpful to have a
- *   small set of graph munging utilities, and the strong invariant that the graph
- *   is stable and correct between peepholes.  In our case `Node.subsume` does
- *   most of the munging, building on our prior stable Node utilities.</li>
- *
- * <li>Changing a Node also changes the graph "neighborhood".  The neighbors need to
- *   be checked to see if THEY can also peephole, and so on.  After any peephole
- *   or graph update we put a Nodes uses and defs on the worklist.</li>
- *
- * <li>Our strong invariant is that for all Nodes, either they are on the worklist
- *   OR no peephole applies.  This invariant is easy to check, although expensive.
- *   Basically the normal "iterate peepholes to a fixed point" is linear, and this
- *   check is linear at each peephole step... so quadratic overall.  It's a useful
- *   assert, but one we can disable once the overall algorithm is stable - and
- *   then turn it back on again when some new set of peepholes is misbehaving.
- *   The code for this is turned on in `IterPeeps.iterate` as `assert
- *   progressOnList(stop);`</li>
- * </ul>
- */
-public class IterPeeps {
-
-    public final WorkList<Node> _work;
-    final WorkList<CallEndNode> _workInline;
-    private int _cnt;
-
-    public IterPeeps( long seed ) {
-        _work       = new WorkList<>(seed);
-        _workInline = new WorkList<>(seed);
-    }
-
-    @SuppressWarnings("unchecked")
-    public <N extends Node> N add( N n ) { return (N)_work.push(n); }
-
-    public void addAll( Ary<Node> ary ) { _work.addAll(ary); }
-
-    /**
-     * Iterate peepholes and inlining to a fixed point
-     */
-    public void iterate( CodeGen code ) {
-        boolean didInline = false;
-        Ary<Node> defer = new Ary<>(Node.class);
-        while( true ) {
-            // Clean up everything that does not grow the code
-            iteratePeeps(code);
-
-            // Pick an inline candidate, no real heuristic, first come, first served
-            boolean inlined = false;
-            CallEndNode cend;
-            while( (cend=_workInline.pop()) != null) {
-                if( cend.isDead() ) continue;
-                byte inline = cend.maybeInline();
-                if( inline == -1 ) defer.add(cend);
-                if( inline > 0 ) {
-                    inlined = true;
-                    break;
-                }
-            }
-            // Inlined, run peeps until clean again
-            if( inlined ) { didInline = true; continue; }
-            // No more candidates, check the defer list
-            if( !didInline ) break; // No more progress, so all the "maybe inline after cleanup" do not progress
-            // Some inlining happened, retry all the "try again after cleanup" calls
-            didInline = false;
-            code.addAll(defer);
-            defer.clear();
-        }
-    }
-
-    // Run all the code-reduction and type-lifting peeps as possible
-    private void iteratePeeps( CodeGen code ) {
-        assert !CodeGen.expensiveAssert(0) || (progressOnList(code, _work) && schedulableUses(code));
-
-        Node n;
-        while( (n=_work.pop()) != null ) {
-            if( n.isDead() )  continue;
-            _cnt++;              // Useful for debugging, searching which peephole broke things
-            var obs = code._obs; // Collect peephole neighbors for graph display
-            if( obs != null ) obs.before(n);
-            Node x = n.peepholeOpt();
-            if( n instanceof CallEndNode cend )
-                _workInline.push(cend);
-            if( x != null ) {
-                assert !x.isDead(); // Peepholes return alive answers
-                // peepholeOpt can return brand-new nodes, needing an initial type set
-                if( x._type==null ) x.setType(x.compute());
-                // Changes require neighbors onto the worklist
-                if( x != n || !(x instanceof ConstantNode) ) {
-                    // All outputs of n (changing node) not x (prior existing node).
-                    for( Node z : n._outputs ) _work.push(z);
-                    // Everybody gets a free "go again" in case they didn't get
-                    // made in their final form.
-                    _work.push(x);
-                    // A self-returning peephole can have rewritten its input
-                    // edges.  The new defs gained a user and may have
-                    // backwards, user-sensitive peepholes of their own.
-                    for( Node z : x._inputs ) _work.push(z);
-                    // If the result is not self, revisit all inputs (because
-                    // there's a new user), and replace in the graph.
-                    if( x != n ) {
-                        //for( Node z : n. _inputs ) _work.push(z);
-                        for( Node z : x._outputs ) _work.push(z);
-                        n.subsume(x);
-                    }
-                }
-                // If there are distant neighbors, move to worklist
-                n.moveDepsToWorklist();
-                // Very expensive assert.
-                assert !CodeGen.expensiveAssert(_cnt) || (progressOnList(code, _work) && schedulableUses(code));
-            }
-            boolean unused = n.isUnused();
-            if( unused ) {
-                assert !(n instanceof StopNode); // StopNodes can die if all code in the compunit dies
-                n.kill();       // Just plain dead
-            }
-            if( obs != null ) obs.after(n, x!=null ? x : unused ? n : null, true);
-        }
-        assert !CodeGen.expensiveAssert(0) || schedulableUses(code);
-
-    }
-
-    // Visit ALL nodes and confirm the invariant:
-    //   Either you are on the _work worklist OR running `iter()` makes no progress.
-
-    // This invariant ensures that no progress is missed, i.e., when the
-    // worklist is empty we have indeed done all that can be done.  To help
-    // with debugging, the {@code assert} is broken out in a place where it is easy to
-    // stop if a change is found.
-
-    // Also, the normal usage of `iter()` may attempt peepholes with distance
-    // neighbors and these should fail, but will then try to add dependencies
-    // {@link #Node.addDep} which is a side effect in an assert.  The {@link
-    // #midAssert} is used to stop this side effect.
-    // Pessimistic solver assert
-    public static boolean progressOnList(CodeGen code, WorkList<Node> list ) {
-        code._midAssert = true;
-        Node changed = code._stop.walk( n -> {
-            // Ignore most in-progress things
-            if( n.iskeep() ) return null;
-            // Types must be forwards, even if on the worklist.
-            Type nval = n.compute();
-            assert nval.isa(n._type) : "Non-monotonic peep: "+n+"#"+n._nid+" old="+n._type+" new="+nval+" inputs="+inputTypes(n)+" peep="+n;
-            if( list.on(n) )
-                return null;    // On worklist is ok!
-            if( n instanceof CallEndNode cend ) {
-                if( code._iter._workInline.on(cend) )
-                    return null; // On inline worklist is ok!
-                assert cend.maybeInline() <= 0 : "Inline fired and not on worklist, CallEndNode#"+cend._nid;
-            }
-            // Off list: must be live, in GVN table, and no peeps.
-            assert n.nOuts() > 0 : "Unused live node: "+n;
-            assert code._gvn.get(n)==n : "Not in GVN table: "+n;
-            Node m = n.peepholeOpt();
-            assert m==null : "Peep fired and not on worklist, "+n.getClass().getSimpleName()+"#"+n._nid+" -> "+m;
-            return m;
-        });
-        code._midAssert = false;
-        return changed==null;
-    }
-
-    private static String inputTypes(Node n) {
-        StringBuilder sb = new StringBuilder("[");
-        for( Node in : n._inputs )
-            sb.append(in==null ? "null" : in.getClass().getSimpleName()+"#"+in._nid+"="+in+":"+in._type+":keep="+in.iskeep()).append(',');
-        return sb.append(']').toString();
-    }
-
-    // GCM assumes every movable node can be placed no earlier than its inputs
-    // and no later than the LCA of its uses.  Catch graphs where a use escapes
-    // above an input-defined branch before the later scheduling pass walks off
-    // the top of the idom tree.
-    private static final IdentityHashMap<Node,CFGNode> earlyCache = new IdentityHashMap<>();
-    private static final BitSet VISIT = new BitSet();
-    public static boolean schedulableUses(CodeGen code) {
-        earlyCache.clear();
-        Node bad = code._stop.walk( n -> {
-            if( n.iskeep() || n.isDead() || n.isConst() ||
-                n instanceof CFGNode || n instanceof PhiNode || n instanceof ProjNode )
-                return null;
-            assert VISIT.isEmpty();
-            CFGNode early = CFGNode.earlyCFG(n,earlyCache,VISIT);
-            VISIT.clear();
-            if( early == null ) return null;
-            CFGNode lca = null;
-            for( Node use : n._outputs ) {
-                CFGNode ublk = useBlock(n,use);
-                if( ublk != null )
-                    lca = ublk.domLCA(lca,null);
-            }
-            if( lca == null ) return null;
-            if( !early.sameFun(lca) )  return null;
-            assert early.dominates(lca,null) : badSchedule(n,early,lca);
-            return null;
-        });
-        return bad == null;
-    }
-
-    private static CFGNode useBlock(Node n, Node use) {
-        if( use == null )
-            return null;
-        if( use instanceof PhiNode phi ) {
-            CFGNode found = null;
-            for( int i=1; i<phi.nIns(); i++ )
-                if( phi.in(i)==n ) {
-                    if( i >= phi.region().nIns() )
-                        return null;
-                    found = phi.region().cfg(i).domLCA(found,null);
-                }
-            return found;
-        }
-        return CFGNode.safeCFG(use);
-    }
-
-    private static String badSchedule(Node n, CFGNode early, CFGNode lca) {
-        StringBuilder sb = new StringBuilder("Unschedulable data node ")
-            .append(n.getClass().getSimpleName()).append('#').append(n._nid)
-            .append(" early=").append(cfg(early))
-            .append(" use-lca=").append(cfg(lca))
-            .append(" node=").append(n).append("\ninputs:");
-        for( int i=0; i<n.nIns(); i++ ) {
-            Node in = n.in(i);
-            sb.append("\n  in").append(i).append(": ").append(node(in))
-              .append(" cfg=").append(cfg(CFGNode.safeCFG(in)));
-        }
-        sb.append("\noutputs:");
-        for( Node use : n._outputs )
-            if( use != null )
-                sb.append("\n  use ").append(node(use))
-                  .append(" block=").append(cfg(useBlock(n,use)));
-        return sb.toString();
-    }
-
-    private static String node(Node n) {
-        return n==null ? "null" : n.getClass().getSimpleName()+"#"+n._nid+" "+n;
-    }
-
-    private static String cfg(CFGNode cfg) {
-        return cfg==null ? "null" : cfg.getClass().getSimpleName()+"#"+cfg._nid+" "+cfg;
-    }
-
-    /**
-     * Classic WorkList, with a fast add/remove, dup removal, random pull.
-     * The Node's nid is used to check membership in the worklist.
-     */
-    @SuppressWarnings("unchecked")
-    public static class WorkList<E extends Node> {
-
-        private Node[] _es;
-        private int _len;
-        private final BitSet _on;   // Bit set if Node._nid is on WorkList
-        private final Random _R;    // For randomizing pull from the WorkList
-        private final long _seed;
-
-        /* Useful stat - how many nodes are processed in the post parse iterative opt */
-        private long _totalWork = 0;
-
-        public WorkList() { this(123); }
-        WorkList(long seed) {
-            _es = new Node[1];
-            _len=0;
-            _on = new BitSet();
-            _seed = seed;
-            _R = new Random();
-            _R.setSeed(_seed);
-        }
-
-        /**
-         * Pushes a Node on the WorkList, ensuring no duplicates
-         * If Node is null it will not be added.
-         */
-        public E push( E x ) {
-            if( x==null ) return null;
-            int idx = x._nid;
-            if( !_on.get(idx) ) {
-                _on.set(idx);
-                if( _len==_es.length )
-                    _es = Arrays.copyOf(_es,_len<<1);
-                _es[_len++] = x;
-                _totalWork++;
-            }
-            return x;
-        }
-
-        public void addAll( Ary<E> ary ) {
-            for( E n : ary )
-                push(n);
-        }
-        public void addAll( E[] es ) {
-            for( E n : es )
-                push(n);
-        }
-
-
-        /**
-         * True if Node is on the WorkList
-         */
-        public boolean on( E x ) { return _on.get(x._nid); }
-
-        /**
-         * Removes a random Node from the WorkList; null if WorkList is empty
-         */
-        public E pop() {
-            if( _len == 0 ) return null;
-            int idx = _R.nextInt(_len);
-            E x = (E)_es[idx];
-            _es[idx] = _es[--_len]; // Compress array
-            _on.clear(x._nid);
-            return x;
-        }
-
-        public boolean isEmpty() { return _len==0; }
-        //Node[] asAry() { return Arrays.copyOf(_es,_len); }
-        //public void clear() {
-        //    _len = 0;
-        //    _on.clear();
-        //    _R.setSeed(_seed);
-        //    _totalWork = 0;
-        //}
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/Parser.java b/chapter-modules/src/main/java/com/seaofnodes/simple/Parser.java
deleted file mode 100644
index 031d36c6..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/Parser.java
+++ /dev/null
@@ -1,3157 +0,0 @@
-package com.seaofnodes.simple;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.node.ScopeNode.Kind;
-
-import static com.seaofnodes.simple.util.Utils.TODO;
-
-import java.util.*;
-
-/**
- * The Parser converts a Simple source program to the Sea of Nodes intermediate
- * representation directly in one pass.  There is no intermediate Abstract
- * Syntax Tree structure.
- * <p>
- * This is a simple recursive descent parser. All lexical analysis is done here as well.
- */
-public class Parser {
-
-    // Compile driver
-    public final CodeGen _code;
-
-    // The Lexer.  Thin wrapper over a byte[] buffer with a cursor.
-    private Lexer _lexer;
-
-    // Class prefix string; TODO: use something short: "%"
-    public static final String CLZ = "class:";
-    private static final String clzPrefix = CLZ;
-    public static String addClzPrefix( String x ) {
-        assert !x.startsWith(clzPrefix);
-        return (clzPrefix+x).intern();
-    }
-    public static boolean startsClzPrefix( String s ) {
-        return s.startsWith(clzPrefix);
-    }
-    public static boolean isPublicClassName( String name ) {
-        if( startsClzPrefix(name) ) name = name.substring(clzPrefix.length());
-        return !name.isEmpty() && name.charAt(0)!='_' && name.indexOf("._")==-1;
-    }
-
-    // Source file for compilation
-    public CompUnit _ref;
-
-    // Current classname being parsed
-    private String _nestedType;
-    /**
-     * Current ScopeNode - ScopeNodes change as we parse code, but at any point of time
-     * there is one current ScopeNode. The reason the current ScopeNode can change is to do with how
-     * we handle branching. See {@link #parseIf()}.
-     * <p>
-     * Each ScopeNode contains a stack of lexical scopes, each scope is a symbol table that binds
-     * variable names to Nodes.  The top of this stack represents current scope.
-     * <p>
-     * We keep a list of all ScopeNodes so that we can show them in graphs.
-     * @see #parseIf()
-     * @see #_xScopes
-     */
-    public ScopeNode _scope;
-
-    /**
-     * List of keywords disallowed as identifiers
-     */
-    public static final HashSet<String> KEYWORDS = new HashSet<>(){{
-            add("bool");
-            add("break");
-            add("byte");
-            add("continue");
-            add("else");
-            add("f32");
-            add("f64");
-            add("false");
-            add("flt");
-            add("i16");
-            add("i32");
-            add("i64");
-            add("i8");
-            add("if");
-            add("int");
-            add("new");
-            add("null");
-            add("return");
-            add("struct");
-            add("true");
-            add("u1");
-            add("u16");
-            add("u32");
-            add("u8");
-            add("while");
-        }};
-
-    /**
-     * We clone ScopeNodes when control flows branch; it is useful to have
-     * a list of all active ScopeNodes for purposes of visualization of the SoN graph
-     */
-    public final Stack<ScopeNode> _xScopes = new Stack<>();
-
-    ScopeNode _breakScope;      // Merge all the while-breaks    here
-    ScopeNode _continueScope;   // Merge all the while-continues here
-    ScopeNode _returnScope;     // Merge all the function exits  here
-    Ary<FRefNode> _frefs;       // Forward refs created during this parse
-    TypeStruct _ctorOpenStruct; // Open struct being initialized by an allocation constructor block.
-    // Constructor exit types survive scope teardown until all fields are known.
-    // A null entry denotes a constructor with no returning path.
-    private ArrayList<IdentityHashMap<Var,Type>> _ctorExits;
-
-    // Mapping from a type name to a Type.  The string name matches
-    // `type.str()` call.
-    public static final HashMap<String, Type> TYPES = new HashMap<>();
-    public static final HashMap<String, Type> INIT_TYPES =
-        new HashMap<>() {{
-            put("bool",TypeInteger.U1 );
-            put("byte",TypeInteger.U8 );
-            put("f32" ,TypeFloat  .F32);
-            put("f64" ,TypeFloat  .F64);
-            put("flt" ,TypeFloat  .F64);
-            put("i16" ,TypeInteger.I16);
-            put("i32" ,TypeInteger.I32);
-            put("i64" ,TypeInteger.BOT);
-            put("i8"  ,TypeInteger.I8 );
-            put("int" ,TypeInteger.BOT);
-            put("u1"  ,TypeInteger.U1 );
-            put("u16" ,TypeInteger.U16);
-            put("u32" ,TypeInteger.U32);
-            put("u8"  ,TypeInteger.U8 );
-            put("val" ,Type.TOP);    // Marker type, indicates type inference
-            put("var" ,Type.BOTTOM); // Marker type, indicates type inference
-        }};
-
-
-    public Parser(CodeGen code ) {
-        _code = code;
-    }
-
-    @Override
-    public String toString() { return _lexer==null ? "" : _lexer.toString(); }
-
-    // Debugging utility to find a Node by index
-    public Node f(int nid) { return _code.f(nid); }
-
-    // Read and set CTRL
-    private Node ctrl() { return _scope.ctrl(); }
-    private <N extends Node> N ctrl(N n) { return _scope.ctrl(n); }
-    // Read and set Memory
-    private Node mem() { return _scope.mem(1); }
-    private void mem(Node mem) { _scope.mem(mem); }
-    // Structural label for precise memory Phis.  The '$' prefix cannot be
-    // referenced in Simple source.
-    public static String memName(int alias) { return ("$"+alias).intern(); }
-
-    // Ordinary parsing carries one whole-memory value.  Alias partitioning is
-    // graph optimization, not parser state.
-    private void storeMem( Node st, int alias, Node prior ) {
-        mem(alias==1 ? st : mergeAlias(prior,alias,st));
-    }
-
-    // A semantic graph partition representing the complete memory after a
-    // precise alias update.  ScopeNode treats this as one opaque value.
-    private Node mergeAlias(Node bulk, int alias, Node precise) {
-        assert bulk != null : "Missing bulk memory for alias #"+alias;
-        MemMergeNode merge = new MemMergeNode(null,bulk);
-        merge.alias(alias,precise);
-        return peep(merge);
-    }
-
-
-    public Ary<FRefNode> parse( CompUnit ref ) {
-        assert _scope == null && _breakScope == null && _continueScope == null && _returnScope == null;
-        assert _frefs == null;
-        _lexer = new Lexer(ref);
-        _frefs = new Ary<>(FRefNode.class);
-        // Starting Scope has control, memory, initial arguments
-        _scope = new ScopeNode();
-        _scope.define(ScopeNode.CTRL, Type.CONTROL   , false, null, _lexer);
-        _scope.define(ScopeNode.MEM0, TypeMem.BOT    , false, null, _lexer);
-        // Track active scopes for Graph display
-        _xScopes.push(_scope);
-        ctrl(_code.XCTRL);
-        mem(con(TypeMem.BOT));
-
-        // File-level struct declaration
-        _ref = ref;
-        _nestedType = ref._cname;
-        String typeName = addClzPrefix(ref._cname);
-
-        ReturnNode clzret = parseStruct( true, typeName );
-
-        if( !_lexer.isEOF() ) throw _errorSyntax("unexpected");
-
-        // All still-unresolved forward refs
-        // should immediately resolve to a file-based name which is a Simple
-        // class type.
-        Ary<FRefNode> frefs = new Ary<>(FRefNode.class);
-        for( FRefNode fref : _frefs ) {
-            if( fref.nIns() != 1 && fref._con == FRefNode.FREF_TYPE ) continue;
-            CompUnit cu = ParseAll.findCompUnitOrThrow(_code,_ref,fref._name);
-            fref._con = TypeMemPtr.make((byte)2,TypeStruct.make(addClzPrefix(cu._cname),true),true);
-            frefs.push(fref);
-        }
-
-        // The class being published
-        ref._clz = (TypeStruct)TYPES.get(typeName);
-
-        // Clean up and reset
-        _xScopes.pop();
-        _scope.kill();
-        _scope = null;
-        _frefs = null;
-
-        return frefs;
-    }
-
-
-    /**
-     *  Parses a function body, assuming the header is parsed.
-     */
-    private ReturnNode parseFunctionBody( TypeFunPtr sig, Lexer loc, String[] ids) {
-        return parseFunctionBody(sig, loc, null, ids);
-    }
-
-    private ReturnNode parseFunctionBody( TypeFunPtr sig, Lexer loc, java.util.BitSet finals, String[] ids) {
-        // Record & restore the existing scope vars.  The function parse might
-        // update fields, so when the parse is done reset back to the pre-parse
-        // state.
-        Node[] preParse = _scope.save();
-
-        // Parse function body normally
-        ReturnNode ret = _parseFunctionBody(null, sig,loc,finals,ids);
-
-        // Reset all fields to pre-parse days
-        _scope.restore(preParse);
-        return ret;
-    }
-
-
-    // Parse a function body
-
-    // Stack the {break,continue,return} scopes and a new lexical scope.
-    // Build a FunNode and parameters, extending scope by parm names.
-    // Parse the function body
-    // - while( not end-of-function )
-    // - - parseStatement
-    // - - If isInit, also incrementally extend the self-type.
-    // If isInit
-    // - upgrade and close the self-type
-    // - Gather fields and store values
-    // - <init> returns self, not last
-    // Unstack the {break,continue,return} scopes.
-
-    private ReturnNode _parseFunctionBody( String funName, TypeFunPtr sig, Lexer loc, String[] ids) {
-        return _parseFunctionBody(funName, sig, loc, null, ids);
-    }
-
-    private ReturnNode _parseFunctionBody( String funName, TypeFunPtr sig, Lexer loc, java.util.BitSet finals, String[] ids) {
-        Constructor outerCtor=_pendingCtor;
-        _pendingCtor=null;
-        boolean isInit = FunNode.isInit(funName);
-        boolean isCtor = isInit || isExplicitConstructorName(funName);
-        String typeName = isCtor ? ((TypeMemPtr)sig._sig[0])._obj._name : null;
-
-        // Stack parser state on the local Java stack, and unstack it later
-        _scope.push(new Kind.Func(funName,isCtor && !funName.endsWith(".<clinit>")));
-        ScopeNode    breakScope =    _breakScope;    _breakScope = null;
-        ScopeNode continueScope = _continueScope; _continueScope = null;
-        ScopeNode   returnScope =   _returnScope;   _returnScope = null;
-
-        int oldUID = _code.UID(); // Used to approximate function size
-        FunNode fun = (FunNode)peep(new FunNode(loc(),sig, funName, _ref, null, _ref._start));
-        // Once the function header is available, install in linker table -
-        // allowing recursive functions.  Linker matches on declared args and
-        // exact fidx, and ignores the return (because the fidx will only match
-        // the exact single function).
-        _code.link(fun);
-
-        Node rpc = new ParmNode("$rpc",0,TypeRPC.BOT,fun,ConstantNode.seed(TypeRPC.BOT).peephole()).peephole();
-
-        // Pre-call the function from Start, with worse-case arguments.  This
-        // represents all the future, yet-to-be-parsed functions calls and
-        // external calls.
-        _scope.ctrl(fun);              // Scope control from function
-        // Private mem alias tracking per function
-        Node defaultMem = new ProjNode(_ref._start,1,ScopeNode.MEM0).peephole();
-        Node privMem = new ParmNode(ScopeNode.MEM0,1,TypeMem.BOT,fun,defaultMem).peephole();
-        mem(privMem);
-        // All args, "as-if" called externally
-        for( int i=0; i<ids.length; i++ ) {
-            Type t = sig.arg(i);
-            // Args take a default input if called from Start/external-world
-            _scope.define(ids[i], t, (i==0 && ids[0]=="self") || (finals!=null && finals.get(i)), new ParmNode(ids[i],i+2,t,fun,ConstantNode.seed(t).peephole()).peephole(), loc);
-        }
-
-        if( isCtor && !isInit ) {
-            int lex=_scope.klast()._lexSize;
-            TypeStruct shape=(TypeStruct)TYPES.get(typeName);
-            for( Field fld : shape._fields ) {
-                int idx=fieldVarIdxBefore(lex,fld._fname);
-                if( idx<0 ) continue;
-                Var v=_scope.var(idx);
-                if( v._fref || v._extern!=0 || v._uninit || _scope.in(v)._type.isConstant() ) continue;
-                Node value=convertExpr(
-                    new LoadNode(loc,fld._fname,fld._alias,ctrl(),fun.parm(3),fun.parm(2),off(shape,fld._fname)).peephole(),v.type());
-                _scope.update(v,value);
-            }
-        }
-
-        // The initializer owns its run-once flag store. Parent initialization
-        // is a structural requirement, executed before this body by CLInit lowering.
-        if( fun.isClz() ) {
-            Node self = fun.parm(2);
-            Field flag = ((TypeMemPtr)self._type)._obj.field("$init");
-            Node prior = mem().keep();
-            Node st = peep(new StoreNode(loc,"$init",flag._alias,flag._t,ctrl(),prior,self,
-                                        fldoff(self,"$init"),con(1),false));
-            storeMem(st,flag._alias,prior);
-            prior.unkeep();
-        }
-
-        // Parse the function body.
-        Node last=_code.ZERO;   // Last statement as the default result
-
-        int nvar = 0;
-        while (!peek('}') && !_lexer.isEOF()) {
-            // Parse a statement; record last statement as default return
-            last = _code.add(parseStatement());
-            // For <init> and <clinit>, local vars are really struct fields and
-            // get exposed as discovered.  This allows late local functions to
-            // use early declared fields.
-            if( isInit )
-                nvar = updateSelfAsFieldsDiscovered( typeName, nvar );
-        }
-
-        if( isInit ) finishConstructor();
-        _pendingCtor=outerCtor;
-
-        ParmNode self = fun.parm(2);
-        // Last expression is the return
-        if( ctrl()._type==Type.CONTROL ) {
-            // Constructors get special return types
-            if( fun.isClz() ) {
-                assert last!=null;
-            } else if( isCtor ) {
-                last = fun.parm(3);
-            }
-            addReturn(last);
-            // exit path is now dead (nothing live after a "return")
-        }
-        if( isCtor )
-            upgradeSelfTypeAndStoreFields( typeName, fun.isClz(), self, fun.parm(3), isInit );
-
-        // Build a return from the _returnScope.
-        // Can be no returns for never-exit functions
-        Node rctl = _returnScope==null ? _code.XCTRL      : _returnScope.ctrl().peephole();
-        Node rmem = rctl==_code.XCTRL  ? con(TypeMem.TOP) : _returnScope.mem();
-        Node expr = rctl==_code.XCTRL  ? con(Type.TOP)    : _returnScope._inputs.last().peephole();
-        ReturnNode ret = (ReturnNode)peep(new ReturnNode(rctl, rmem, expr, rpc, fun));
-        fun.setRet(ret);
-        // Approximate function size, for inlining heuristics
-        fun._approxUIDs = _code.UID() - oldUID;
-        for( Node cend : ret.outs() )
-            if( cend instanceof CallEndNode )
-                throw TODO(); //_code.add(cend); // have call ends ALREADY? just barely made the Return
-
-        // Export (and keep-alive) functions until prove dead
-        _ref.addFun(_code,fun);
-
-        // Unstack parser state
-        if( _returnScope != null ) _returnScope.kill();
-        _returnScope   =   returnScope;
-        _continueScope = continueScope;
-        _breakScope    =    breakScope;
-        _scope.pop();
-
-        return ret;
-    }
-
-    private int updateSelfAsFieldsDiscovered( String typeName, int nvar ) {
-        int lex = _scope.klast()._lexSize + 2/*Skip self and selfMem*/;
-        // Load self type in and out of the TYPES hashtable.
-        TypeStruct tself = (TypeStruct)TYPES.get(typeName);
-        // Start looking for newly declared vars at the lexical scope start,
-        // skipping two ("self" and "selfmem") and fields seen already.
-        while( lex + nvar < _scope.nIns() ) {
-            Var v = _scope.var(lex + nvar++);
-            // Field with sharper type
-            Field old = tself.field(v._name);
-            Field fld = v._extern!=0
-                ? Field.make(v._name,v.type(),v._extern,false,true)
-                : old == null
-                ? Field.make(v._name,v.type(),_code.alias(_ref._cname),v._final)
-                : old.makeFrom(v.type());
-            tself = tself.addOrUpdate(fld);
-        }
-        TYPES.put(typeName,tself);
-        return nvar;
-    }
-
-
-    void upgradeSelfTypeAndStoreFields( String typeName, boolean isClz, ParmNode self, ParmNode smem, boolean upgrade ) {
-        int lex = _scope.klast()._lexSize;
-        assert _scope.var(lex)._name=="self";
-        TypeStruct tself = (TypeStruct)TYPES.get(typeName);
-        int base = lex+2;       // Skip ctrl, mem
-        if( upgrade ) {
-            // Default <init>/<clinit> defines the struct and can sharpen fields.
-            // A named constructor only initializes the already-closed struct.
-            for( int i=0; i<tself.nkids(); i++ ) {
-                Field tfld = tself._fields[i];
-                int vidx = fieldVarIdx(base,tfld._fname);
-                if( vidx == -1 )
-                    continue;
-                Var v = _scope.var(vidx);
-                // Forward-ref fields where placed in tself but will get promoted
-                // to an outer scope - and should not be in tself.
-                if( v._fref )
-                    tself = tself.remove(i--);
-                else if( v.type() != tfld._t ) {
-                    assert v.type().isa(tfld._t);
-                    tself = tself.replace( tfld.makeFrom( v.type() ) );
-                }
-            }
-
-            // Close Struct type after parsing struct body.
-            TYPES.put( tself._name, tself = tself.close() );
-            // Improve self, selfMem types in scope.
-            // Class self-type is a singleton pointer.  Instance <init> receives the
-            // broad allocation pointer, while private memory tracks initialized fields.
-            self._declaredType = self._type = isClz ? TypeMemPtr.make((byte)2,tself,true) : TypeMemPtr.make(constructorRecv(tself));
-            FunNode fun = self.fun();
-            fun.setSig(fun.sig().makeFrom(self._type,0));
-            if( !isClz )        // <init> returns upgraded private memory
-                smem._declaredType = smem._type = TypeMem.makePrivate(tself);
-        }
-
-        if( !upgrade ) {
-            IdentityHashMap<Var,Type> exit = null;
-            if( _returnScope!=null && !_returnScope.ctrl()._type.isHigh() ) {
-                exit = new IdentityHashMap<>();
-                int first = _scope._kinds.at(_scope.depth()-2)._lexSize+2;
-                for( int i=first; i<lex; i++ )
-                    exit.put(_scope.var(i),_returnScope.in(i)._type);
-            }
-            _ctorExits.add(exit);
-        } else if( !isClz ) {
-            checkInitFields(tself,base);
-        }
-
-        // When can _returnScope be null here? A never-exit constructor will
-        // not have any returns, and thus no need to gather values and store
-        // them into the (never) constructed object
-        if( _returnScope==null )
-            return;
-
-        // A MemMerge to gather field updates as stores.  Classes update the
-        // normal public memory.  <init> updates the private memory that got
-        // passed in - is treated like a normal argument and not like memory.
-        Node mmm = isClz ? _returnScope.mem(1) : smem;
-
-
-        // Store constructor results into fields
-        for( int i=0; i<tself.nkids(); i++ ) {
-            Field fld = tself._fields[i];
-            int vidx = upgrade
-                ? fieldVarIdx(base,fld._fname)
-                : fieldVarIdxBefore(lex,fld._fname);
-            if( vidx == -1 )
-                continue;
-            Var v = _scope.var(vidx);
-            if( v._fref || v._extern!=0 ) continue; // C storage has no Simple initializer
-            // NewNode's TOP field is the zero-code poison for a required
-            // field. Leave it alone unless the declaration body supplied a
-            // value; otherwise a user constructor must initialize it.
-            Node val = _returnScope.in(vidx);
-            if( upgrade && v._uninit &&
-                !initialized(val._type) ) continue;
-            // A numeric merge can still be untyped while parsing. Retain its
-            // declared conversion at the helper boundary, as assignments do.
-            if( fld._t instanceof TypeInteger || fld._t instanceof TypeFloat )
-                val=convertExpr(val,fld._t);
-            // Store value into extended struct
-            Node prior = mmm.keep();
-            Node st = peep(new StoreNode(null, fld._fname, fld._alias, fld._t, null, prior, self, off(tself,fld._fname), val, fld._final));
-            mmm = mergeAlias(prior,fld._alias,st);
-            prior.unkeep();
-        }
-        mmm = mmm.peephole();
-
-        if( !isClz )
-            // Stuff private mem into normal expression return value.
-            _returnScope.setDef(_returnScope.nIns()-1,mmm);
-        else
-            // Parser memory is one opaque whole-memory edge.  Publish the
-            // completed class-field aggregate as the <clinit> return memory.
-            _returnScope.mem(mmm);
-            //_code.add(mmm);
-    }
-
-    // Validate each user constructor, or an implicit empty one, before the
-    // declaration scope goes away. Later fields use their declaration defaults.
-    private static boolean initialized(Type t) {
-        return t!=Type.BOTTOM && !t.isHigh() && (!(t instanceof TypeNil tn) || tn.notNull());
-    }
-
-    private void checkInitFields(TypeStruct ts, int base) {
-        if( _returnScope==null || _returnScope.ctrl()._type.isHigh() ) return;
-        boolean implicit = _ctorExits.isEmpty();
-        if( implicit ) _ctorExits.add(new IdentityHashMap<>());
-        for( IdentityHashMap<Var,Type> exit : _ctorExits ) {
-            if( exit==null ) continue;
-            for( Field fld : ts._fields ) {
-                int idx = fieldVarIdx(base,fld._fname);
-                if( idx == -1 ) continue;
-                Var v = _scope.var(idx);
-                if( !v._uninit || v._fref ) continue;
-                Type t = exit.getOrDefault(v,_returnScope.in(idx)._type);
-                if( !initialized(t) )
-                    throw error("'"+ts._name+"' is not fully initialized, field '"+fld._fname+
-                                (implicit ? "' needs to be set in a constructor" :
-                                            "' is only partially set in the constructor"),v._loc);
-            }
-        }
-    }
-
-    private int fieldVarIdx( int base, String name ) {
-        for( int i=base; i<_scope.nIns(); i++ )
-            if( _scope.var(i)._name == name )
-                return i;
-        return -1;
-    }
-
-    // Named constructors update field Vars from the enclosing initializer
-    // scope.  Constructor arguments and locals begin at limit and must not
-    // shadow the field state gathered into private memory.
-    private int fieldVarIdxBefore( int limit, String name ) {
-        for( int i=limit-1; i>=0; i-- )
-            if( _scope.var(i)._name == name )
-                return i;
-        return -1;
-    }
-
-    private boolean isConstructorDecl(String name) {
-        TypeStruct self = _scope.constructorSelf();
-        return self != null && name == initFieldName(self._name);
-    }
-
-    private boolean inExplicitConstructor() {
-        Kind.Func func = (Kind.Func)_scope._kinds.at(_scope.enclosingFuncOrDecl());
-        return isExplicitConstructorName(func._name);
-    }
-
-    private boolean isExplicitConstructorName(String funName) {
-        TypeStruct self = _scope.constructorSelf();
-        return self != null && funName == (self._name+"."+initFieldName(self._name)).intern();
-    }
-
-    private static TypeStruct constructorRecv(TypeStruct self) {
-        Field[] fs = new Field[self._fields.length];
-        for( int i=0; i<fs.length; i++ ) {
-            Field fld = self._fields[i];
-            fs[i] = fld.makeFrom(fld._t.makeStorage());
-        }
-        return TypeStruct.make(self._name,self._open,fs);
-    }
-
-
-    /**
-     * Parses a block
-     *
-     * <pre>
-     *     '{' statements '}'
-     * </pre>
-     * Does not parse the opening or closing '{}'
-     * @return a {@link Node} or {@code null}
-     */
-    private Node parseBlock(Kind kind) {
-        // Enter a new scope
-        _scope.push(kind);
-        Node last = _code.ZERO;
-        while (!peek('}') && !_lexer.isEOF()) {
-            _code.add(last);
-            last = parseStatement();
-        }
-        // Exit scope
-        last.keep();
-        _scope.pop();
-        return last.unkeep();
-    }
-
-    /**
-     * Parses a statement
-     *
-     * <pre>
-     *     returnStatement | declStatement | blockStatement | ifStatement | expressionStatement
-     * </pre>
-     * @return a {@link Node} or {@code null}
-     */
-    private Node parseStatement() {
-        if(      matchx("return")  ) return parseReturn();
-        else if (matchx("if")      ) return parseIf();
-        else if (matchx("while")   ) return parseWhile();
-        else if (matchx("for")     ) return parseFor();
-        else if (matchx("break")   ) return parseBreak();
-        else if (matchx("continue")) return parseContinue();
-        else if (matchx("struct")  ) return parseStruct();
-        else if (inStructDeclaration() && matchx("new")) return parseConstructorDeclaration();
-        else if (matchx(";")       ) return _code.ZERO; // Empty statement
-        // Break ambiguity around leading function types and starting a block
-        else if (peek('{') && !isTypeFun() ) {
-            match("{");
-            return require(parseBlock(new Kind.Block()),"}");
-        }
-        // Declaration or normal assignment/expression
-        else return parseDeclarationStatement();
-    }
-
-    private boolean inStructDeclaration() {
-        return _scope.klast() instanceof Kind.Func fun && FunNode.isInstance(fun._name);
-    }
-
-    // Constructor declaration: new TypeName = { args -> body };
-    private record Constructor(String name, Lexer body) {}
-    private Constructor _pendingCtor;
-
-    private Node parseConstructorDeclaration() {
-        TypeStruct self = _scope.constructorSelf();
-        assert self != null;
-        String name = requireId();
-        String expect = initFieldName(self._name);
-        if( name != expect )
-            throw error("Constructor name '" + name + "' must match type name '" + expect + "'");
-        require("=");
-        if( _pendingCtor!=null ) throw error("Redefining constructor '"+name+"'");
-        _pendingCtor=new Constructor(name,loc());
-        // Parse the body after all field declarations are known, so self.x
-        // and x share a local slot even when x is declared below this body.
-        require("{");
-        int depth=1;
-        while( depth>0 ) {
-            _lexer.skipWhiteSpace();
-            if( _lexer.isEOF() ) throw error("Unclosed constructor body");
-            char ch=_lexer.nextChar();
-            if( ch=='{' ) depth++;
-            else if( ch=='}' ) depth--;
-            else if( ch=='"' || ch=='\'' ) {
-                char quote=ch;
-                while( !_lexer.isEOF() ) {
-                    ch=_lexer.nextChar();
-                    if( ch=='\\' ) _lexer.nextChar();
-                    else if( ch==quote ) break;
-                }
-            }
-        }
-        require(";");
-        return _code.ZERO;
-    }
-
-    private void finishConstructor() {
-        if( _pendingCtor==null ) return;
-        Constructor ctor=_pendingCtor;
-        _pendingCtor=null;
-        Lexer after=_lexer;
-        _lexer=new Lexer(ctor.body());
-        defineConstructor(ctor.name());
-        _lexer=after;
-    }
-
-    private void defineConstructor(String name) {
-        TypeStruct self=_scope.constructorSelf();
-        Node ctor = constructorFunc(name);
-        TypeFunPtr sig = (TypeFunPtr)ctor._type;
-        String clzName = addClzPrefix(self._name);
-        TypeStruct clz = (TypeStruct)TYPES.get(clzName);
-        Field old = clz==null ? null : clz.field("<ctor>");
-        if( old != null )
-            throw error("Redefining constructor '" + name + "'");
-        Field fld = Field.make("<ctor>",sig,_code.alias(_ref._cname),true);
-        TYPES.put(clzName,clz==null ? TypeStruct.make(clzName,true,fld) : clz.add(fld));
-        require(ctor,";");
-    }
-
-    /**
-     * Parses a while statement
-     *
-     * <pre>
-     *     while ( expression ) statement
-     * </pre>
-     * @return a {@link Node}, never {@code null}
-     */
-    private Node parseWhile() {
-        require("(");
-        return parseLooping(false);
-    }
-
-
-    /**
-     * Parses a for statement
-     *
-     * <pre>
-     *     for( var x=init; test; incr ) body
-     * </pre>
-     * @return a {@link Node}, never {@code null}
-     */
-    private Node parseFor() {
-        // {   var x=init,y=init,...;
-        //     while( test ) {
-        //         body;
-        //         next;
-        //     }
-        // }
-        require("(");
-        _scope.push(new Kind.Block()); // Scope for the index variables
-        if( !match(";") )        // Can be empty init "for(;test;next) body"
-            parseDeclarationStatement(); // Non-empty init
-        Node rez = parseLooping(true);
-        _scope.pop();           // Exit index variable scope
-        return rez;
-    }
-
-    // Shared by `for` and `while`
-    private Node parseLooping( boolean doFor ) {
-
-        var savedContinueScope = _continueScope;
-        var savedBreakScope    = _breakScope;
-
-        // Loop region has two control inputs, the first is the entry
-        // point, and second is back edge that is set after loop is parsed
-        // (see end_loop() call below).  Note that the absence of back edge is
-        // used as an indicator to switch off peepholes of the region and
-        // associated phis; see {@code inProgress()}.
-
-        ctrl(new LoopNode(loc(),null,ctrl()).peephole()); // Note we set back edge to null here
-
-        // At loop head, we clone the current Scope (this includes all
-        // names in every nesting level within the Scope).
-        // We create phis eagerly for all the names we find, see dup().
-
-        // Save the current scope as the loop head
-        ScopeNode head = _scope.keep();
-        // Clone the head Scope to create a new Scope for the body.
-        // Create phis eagerly as part of cloning
-        _xScopes.push(_scope = _scope.dup(true)); // The true argument triggers creating phis
-
-        // Parse predicate
-        var pred = peek(';') ? con(1) : parseAsgn();
-        require( doFor ? ";" : ")" );
-
-        // IfNode takes current control and predicate
-        Node ifNode = new IfNode(ctrl(), pred.keep()).peephole();
-        // Setup projection nodes
-        CFGNode ifT = new CProjNode(ifNode.  keep(), 0, "True" ).peephole().keep();
-        CFGNode ifF = (CFGNode)new CProjNode(ifNode.unkeep(), 1, "False").peephole();
-
-        // for( ;;next ) body
-        int nextPos = -1, nextEnd = -1;
-        if( doFor ) {
-            // Skip the next expression and parse it later
-            nextPos = pos();
-            skipAsgn();
-            nextEnd = pos();
-            require(")");
-        }
-
-        // Clone the body Scope to create the break/exit Scope which accounts for any
-        // side effects in the predicate.  The break/exit Scope will be the final
-        // scope after the loop, and its control input is the False branch of
-        // the loop predicate.  Note that body Scope is still our current scope.
-        ctrl(ifF);
-        _xScopes.push(_breakScope = _scope.dup());
-        _breakScope.addGuards(ifF,pred,true); // Up-cast predicate
-
-        // No continues yet
-        _continueScope = null;
-
-        // Parse the true side, which corresponds to loop body
-        // Our current scope is the body Scope
-        ctrl(ifT.unkeep());     // set ctrl token to ifTrue projection
-        _scope.addGuards(ifT,pred.unkeep(),false); // Up-cast predicate
-        parseStatement().isKill();                 // Parse loop body
-        _scope.removeGuards(ifT);
-
-        // Merge the loop bottom into other continue statements
-        if (_continueScope != null) {
-            _continueScope = jumpTo(_continueScope);
-            _scope.kill();
-            _scope = _continueScope;
-        }
-
-        // Now append the next code onto the body code
-        if( doFor ) {
-            int old = pos(nextPos);
-            if( !peek(')') )
-              parseAsgn();
-            if( pos() != nextEnd )
-                throw errorSyntax( "Unexpected code after expression" );
-            pos(old);
-        }
-
-        // The true branch loops back, so whatever is current _scope.ctrl gets
-        // added to head loop as input.  endLoop() updates the head scope, and
-        // goes through all the phis that were created earlier.  For each phi,
-        // it sets the second input to the corresponding input from the back
-        // edge.  If the phi is redundant, it is replaced by its sole input.
-        var exit = _breakScope;
-        head.balanceLoopFRefs(_scope);
-        exit.balanceLoopFRefs(_scope);
-        head.endLoop(_scope, exit);
-        head.unkeep().kill();
-
-        _xScopes.pop();       // Cleanup
-        _xScopes.pop();       // Cleanup
-
-        _continueScope = savedContinueScope;
-        _breakScope = savedBreakScope;
-
-        // At exit the false control is the current control, and
-        // the scope is the exit scope after the exit test.
-        // During sys parsing, there is no xscope here.
-        if( !_xScopes.isEmpty() ) {
-            _xScopes.pop();
-            _xScopes.push( exit );
-        }
-        _scope = exit;
-        return _code.ZERO;
-    }
-
-    private ScopeNode jumpTo(ScopeNode toScope) {
-        ScopeNode cur = _scope.dup();
-        ctrl(_code.XCTRL); // Kill current scope
-        // Prune nested lexical scopes that have depth > than the loop head
-        // We use _breakScope as a proxy for the loop head scope to obtain the depth
-        while( cur.depth() > _breakScope.depth() )
-            cur.pop();
-        // If this is a continue then first time the target is null
-        // So we just use the pruned current scope as the base for the
-        // "continue"
-        if( toScope == null )
-            return cur;
-        // toScope is either the break scope, or a scope that was created here
-        assert toScope.depth() <= _breakScope.depth();
-        toScope.ctrl(toScope.mergeScopes(cur,loc()).peephole());
-        return toScope;
-    }
-
-    private void checkLoopActive() { if (_breakScope == null) throw error("No active loop for a break or continue"); }
-
-    private Node parseContinue() { checkLoopActive(); _continueScope = require(jumpTo( _continueScope ),";"); return _code.ZERO; }
-    private Node parseBreak   () {
-        checkLoopActive();
-        // At the time of the break, and loop-exit conditions are only valid if
-        // they are ALSO valid at the break.  It is the intersection of
-        // conditions here, not the union.
-        _breakScope.removeGuards(_breakScope.ctrl());
-        _breakScope = require(jumpTo(_breakScope ),";");
-        _breakScope.addGuards((CFGNode)_breakScope.ctrl(), null, false);
-        return _code.ZERO;
-    }
-
-    // Look for an unbalanced `)`, skipping balanced
-    private void skipAsgn() {
-        int paren=0;
-        while( true )
-            // Next X char handles skipping complex comments
-            switch( _lexer.nextXChar() ) {
-            case Character.MAX_VALUE:
-                throw TODO();
-            case ')':
-                if( --paren<0 ) {
-                    posT( pos() - 1 );
-                    return; // Leave the `)` behind
-                }
-                break;
-            case '(': paren ++; break;
-            default: break;
-            }
-    }
-
-
-    /**
-     * Parses a statement
-     *
-     * <pre>
-     *     if ( expression ) statement [else statement]
-     * </pre>
-     * @return a {@link Node}, never {@code null}
-     */
-    private Node parseIf() {
-        // Parse predicate
-        require("(");
-        var pred = require(parseAsgn(), ")");
-        return parseTrinary(pred,"else");
-    }
-
-    // Parse a conditional expression, merging results.
-    private Node parseTrinary( Node pred, String fside ) {
-        // IfNode takes current control and predicate
-        pred.keep();
-        Node ifNode = new IfNode(ctrl(), pred).peephole();
-        // Setup projection nodes
-        CFGNode ifT = new CProjNode(ifNode.  keep(), 0, "True" ).peephole().keep();
-        CFGNode ifF = new CProjNode(ifNode.unkeep(), 1, "False").peephole().keep();
-        // In if true branch, the ifT proj node becomes the ctrl
-        // But first clone the scope and set it as current
-        ScopeNode fScope = _scope.dup(); // Duplicate current scope
-        fScope.ctrl(ifF);       // The pending arm already starts at False
-        _xScopes.push(fScope); // For graph visualization we need all scopes
-
-        // Parse the true side
-        ctrl(ifT.unkeep());     // set ctrl token to ifTrue projection
-        _scope.addGuards(ifT,pred,false); // Up-cast predicate
-        // Parse true-side flavor
-        Node lhs = switch( fside ) {
-        case "else" -> parseStatement(); // if( pred )  stmts;
-        case ":"    -> parseAsgn();      //     pred ?  asgn;
-        case "&&"   -> parseLogical();   //     pred && expr
-        case "||"   -> pred;             //     pred || expr_is_ignored
-        default     -> throw TODO();
-        };
-        lhs.keep();
-        _scope.removeGuards(ifT);
-
-        // See if a one-sided def was made: "if(pred) int x = 1;" and throw.
-        // See if any forward-refs were made, and copy them to the other side:
-        // "pred ? n*fact(n-1) : 1"
-        fScope.balanceIf(_scope);
-
-        ScopeNode tScope = _scope;
-
-        // Parse the false side
-        _scope = fScope;        // Restore scope, then parse else block if any
-        ifF.unkeep();           // fScope already owns the false control
-        // Up-cast predicate, even if not else clause, because predicate can
-        // remain true if the true clause exits: `if( !ptr ) return 0; return ptr.fld;`
-        _scope.addGuards(ifF,pred,true);
-        // Parse false-side flavor
-        boolean doRHS = false;  // RHS is optional for if/else and trinary
-        Node rhs = switch( fside ) {
-        case "else" -> (doRHS=match(fside)) ? parseStatement() : con(lhs._type.makeZero());
-        case ":"    -> (doRHS=match(fside)) ? parseAsgn()      : con(lhs._type.makeZero());
-        case "&&"   -> con(lhs._type.makeZero()); // pred && expr_is_ignored
-        case "||"   -> parseLogical();            // pred || expr
-        default     -> throw TODO();
-        };
-        rhs.keep();
-        _scope.removeGuards(ifF);
-        // The RHS of `||` is parsed on the false side, so retain its updated
-        // control, memory and locals just as an explicit else arm does.
-        if( doRHS || fside.equals("||") )
-            fScope = _scope;
-        pred.unkeep();
-
-        // Check the trinary widening int/flt
-        if( !fside.equals("else") ) {
-            rhs = widenInt( rhs.unkeep(), lhs._type ).keep();
-            lhs = widenInt( lhs.unkeep(), rhs._type ).keep();
-        }
-
-        _scope = tScope;
-        _xScopes.pop();       // Discard pushed from graph display
-        // See if a one-sided def was made: "if(pred) int x = 1;" and throw.
-        // See if any forward-refs were made, and copy them to the other side:
-        // "pred ? n*fact(n-1) : 1"
-        tScope.balanceIf(fScope);
-
-        // Merge results
-        RegionNode r = ctrl(tScope.mergeScopes(fScope,loc()));
-        Node ret = peep(new PhiNode("",r,lhs.unkeep(),rhs.unkeep()));
-        // Immediately fail e.g. `arg ? 7 : ptr`
-        ParseException err;
-        if( !fside.equals("else") && (err=ret.err()) !=null ) throw err;
-        ret.keep();
-        r.peephole();
-        return ret.unkeep();
-    }
-
-    /**
-     * Parses a return statement; "return" already parsed.
-     * The $ctrl edge is killed.
-     *
-     * <pre>
-     *     'return' expr ;
-     * </pre>
-     * @return an expression {@link Node}, never {@code null}
-     */
-    private Node parseReturn() {
-        var expr = require(parseAsgn(), ";");
-        return addReturn(expr);
-    }
-    private Node addReturn(Node expr) {
-        expr.keep();
-        // Need default memory, since it can be lazy, need to force
-        // a non-lazy Phi
-        mem();                 // Force a pending lazy bulk-memory Phi
-        // For <init> and <clinit> - all fields in scope will be live-on-exit
-        // and stored into `self` and need to have lazy-phi's inserted.
-        int lexN = _scope.enclosingFuncOrDecl();
-        Kind.Func k = (Kind.Func)_scope._kinds.at(lexN);
-        if( FunNode.isInit(k._name) ) {
-            int nestedLexSize = lexN+1 < _scope.depth() ? _scope._kinds.at(lexN+1)._lexSize : _scope.nIns();
-            for( int i=k._lexSize; i<nestedLexSize; i++ )
-                _scope.update(_scope.var(i),null);
-            if( _returnScope != null ) {
-                Var vexpr = _returnScope._vars.pop();
-                Node oldX = _returnScope.removeLast();
-                int rlen = _returnScope.nIns();
-                while( rlen  < nestedLexSize ) {
-                    _returnScope._vars.add(_scope.var(rlen));
-                    _returnScope.addDef(con(_scope.var(rlen++).type().makeZero()));
-                }
-                _returnScope._vars.add(vexpr);
-                _returnScope.addDef(oldX);
-            }
-        } else if( isExplicitConstructorName(k._name) ) {
-            // Field bindings live in the enclosing declaration, not among the
-            // constructor's arguments/locals. Force lazy Phis on every exit.
-            int first = _scope._kinds.at(lexN-1)._lexSize+2;
-            for( int i=first; i<k._lexSize; i++ )
-                _scope.update(_scope.var(i),null);
-        }
-
-        // No prior merge point?  Just clone and hang on to it
-        if( _returnScope == null ) {
-            _returnScope = _scope.dup();
-            while( lexN+1 < _returnScope.depth() )
-                _returnScope._pop(); // Pop a nested block scope until we hit the function scope
-            _returnScope.define("$expr", inferredReturnType(expr._type), true, expr, null);
-
-        } else {
-            // For <init> and <clinit> - ALL FIELDS IN LAST SCOPE are live
-            // and need to have lazy-phi's inserted.
-
-            // And fields might not match.... will need matching Var/define with default values
-            int rlen = _returnScope.nIns()-1;
-            RegionNode r = ctrl(new RegionNode(null, null,_returnScope.ctrl(), _scope.ctrl()).init().keep());
-            _returnScope._merge(_scope, r, rlen);
-            Node oldExpr = _returnScope.in(rlen);
-            _returnScope.setDef(rlen,new PhiNode("$expr", r, oldExpr, expr).peephole());
-            _code.add(r);
-            _returnScope.ctrl(r.unkeep());
-        }
-        ctrl(_code.XCTRL);      // Kill control
-        return expr.unkeep();
-    }
-
-    /** Parse: [name '='] expr
-     */
-    private Node parseAsgn() {
-        int old = pos();
-        String name = _lexer.matchId();
-        // Just a plain expression, no assignment.
-        // Distinguish `var==expr` from `var=expr`
-        if( name==null || KEYWORDS.contains(name) || !matchOpx('=','=') )
-            {  pos(old);  return parseExpression();  }
-
-        // Find variable to update
-        Var def = _scope.lookup(name);
-        if( def==null )
-            def = defineOpenConstructorField(name);
-        if( def==null )
-            throw error("Undefined name '" + name + "'");
-
-        if( def._extern!=0 )    // Parse the C binding as a memory lvalue
-            {  pos(old);  return parseExpression();  }
-
-        // TOP fields are for late-initialized fields; these have never
-        // been written to, and this must be the final write.  Other writes
-        // outside the constructor need to check the final bit.
-        if( _scope.in(def._idx)._type!=Type.TOP && def._final &&
-            // Inside an allocation, final assign is OK, outside nope.
-            // The alloc() call added the allocation scope
-            !_scope.canInit(def) )
-            throw error("Cannot reassign final '"+name+"'");
-        checkSharedFunction(def);
-
-        // Parse assignment expression
-        Node expr = parseAsgn();
-
-        // Lift expression, based on type
-        Type decl = def.type(); // Declared type
-        Node lift = convertExpr(expr.keep(), decl).keep();
-        // Update
-        _scope.update(name,lift);
-
-        // Check for storing into an instance field instead of a local var
-        int kx = _scope.kindx(def); // Declaration scope
-        int fx = _scope.enclosingFunction(); // Enclosing function scope
-        Kind kk = _scope._kinds.at(kx);
-        Kind fk = _scope._kinds.at(fx);
-        // Access instance field from 'self'
-        if( kx+1 == fx && kk instanceof Kind.Func inst && FunNode.isInstance(inst._name) &&
-            fk instanceof Kind.Func method && !inExplicitConstructor() ) {
-            // Named field offset on an unknown struct type
-            TypeMemPtr self = (TypeMemPtr)_scope.var(fk._lexSize).type();
-            TypeStruct sobj = (TypeStruct)TYPES.get(self._obj._name);
-            Field fld = sobj.field(name);
-            int alias = fld._alias;
-            Node ptr = _scope.in(method._lexSize);
-            Node off = fldoff(ptr,name);
-            Node prior = mem().keep();
-            Node st = new StoreNode(loc(), name, alias, decl, ctrl(), prior, ptr, off, lift, inExplicitConstructor()).peephole().keep();
-            storeMem(st,alias,prior);
-            st.unkeep();
-            prior.unkeep();
-        }
-        lift.unkill();
-
-
-        // Return un-lifted expr
-        return expr.unkeep();
-    }
-
-    // Widen ints to floats; narrow wide int types.
-    // Early error if types do not match variable.
-    private Node convertExpr( Node expr, Type t ) {
-        if( !expr._type.accessISA(t) )
-            throw error("Type "+expr._type.str()+" is not of declared type "+t.str());
-        if( t instanceof TypeMemPtr tmp && tmp.isFinal() )
-            expr = peep(new ReadOnlyNode(expr));
-        // A FunPtr carries the semantic edge to its function's Return.  Do not
-        // hide that edge behind a Convert which can fold to a plain constant.
-        if( expr instanceof FunPtrNode && t instanceof TypeFunPtr )
-            return expr;
-        // Auto-widen array to i64 (cast ptr to raw int bits)
-        if( t == TypeInteger.BOT && expr._type instanceof TypeMemPtr tmp && tmp._obj.isAry() )
-            return peep(new AddNode(peep(new PtrToIntNode(expr)),off(tmp._obj,"[]")));
-        // Widen ints to floats, narrow wide types
-        return peep(new ConvertNode(t,expr));
-    }
-
-    // Inferred `var` declarations describe writable slots, not the exact
-    // value used to initialize them.  Explicitly typed locals retain the
-    // user's nullability and numeric-width guarantees; `val` retains the
-    // initializer's precise type.
-    private static Type mutableInferredType(Type t) {
-        return switch( t ) {
-        case TypeInteger ti -> TypeInteger.BOT;
-        case TypeFloat   tf -> TypeFloat.F64;
-        case TypeMemPtr tmp -> tmp.makeVar();
-        case TypeFunPtr tfp -> tfp;
-        case TypeConAry<?> a -> a;
-        case TypePtr     ptr -> TypePtr.PTR;
-        case TypeScalar  ts -> TypeScalar.BOT;
-        default             -> t;
-        };
-    }
-
-    private Type constructorFieldType(Type t) {
-        if( t instanceof TypeMemPtr ptr && ptr._obj.isConAry() ) {
-            TypeStruct declared=(TypeStruct)TYPES.get(ptr._obj._name);
-            TypeStruct shape=typeAry(declared._fields[1]._t,ptr._obj._fields[1]._final);
-            return TypeMemPtr.make((byte)2,shape,false).withAccess(ptr._ro);
-        }
-        return mutableInferredType(t);
-    }
-
-    // Seed an inferred return merge with the declared numeric family instead
-    // of a transient constant/range.  Pointer nullability remains part of the
-    // inferred function result and is combined by the later Phi.
-    private static Type inferredReturnType(Type t) {
-        return switch( t ) {
-        case TypeInteger ti -> TypeInteger.BOT;
-        case TypeFloat   tf -> TypeFloat.F64;
-        default             -> t;
-        };
-    }
-
-    private Node widenInt( Node expr, Type t ) {
-        return (expr._type instanceof TypeInteger || expr._type==Type.NIL) && t instanceof TypeFloat
-            ? peep(new ToFloatNode(expr)) : expr;
-    }
-
-    /**
-     * Parse declaration or expression statement
-     * declStmt = type var['=' exprAsgn][, var['=' exprAsgn]]* ';' | exprAsgn ';'
-     * <p>
-     * exprAsgn = var '=' exprAsgn | expr
-     */
-    private Node parseDeclarationStatement() {
-        int old = pos();
-        Type t = type();
-        if( peek('.') )         // Ambiguity static vars: "type.var", parse as expression
-            { pos(old); t=null; }
-        if( t == null )
-            return require(parseAsgn(),";");
-
-        // now parse var['=' asgnexpr] in a loop
-        Node n = parseDeclaration(t);
-        while( match(",") )
-            n = parseDeclaration(t);
-        return require(n,";");
-    }
-
-    // The binding modifier sits immediately before the name. It never
-    // changes permissions on the referenced object.
-    private boolean bindingFinal(Type t) {
-        if( match("!") ) return false;
-        if( match("~") ) return true;
-        return t==Type.TOP || t instanceof TypeNil;
-    }
-
-    /** Parse final: [!|~]var['=' asgn]
-     */
-    private Node parseDeclaration(Type t) {
-        assert t!=null;
-        // Has var/val instead of a user-declared type
-        boolean inferType = t==Type.TOP || t==Type.BOTTOM;
-        boolean xfinal = bindingFinal(t);
-        Lexer loc = loc();
-        String name = requireId();
-        // Optional initializing expression follows
-        boolean fld_final = false; // Field is final, but not deeply final
-        boolean uninit = false;    // Required non-null constructor field
-        Node expr;
-        if( match("=") ) {
-            if( isExternDecl() ) {
-                if( !(t instanceof TypeFunPtr) ) {
-                    Node ptr = externData(name,t);
-                    // The lexical binding is a fixed address; its contents are mutable.
-                    if( !_scope.define(name,t,true,ptr,loc) )
-                        throw error("Redefining name '"+name+"'",loc);
-                    _scope.lookup(name)._extern = _code.externAlias(name);
-                    return _code.ZERO;
-                }
-                expr = externDecl(name,t);
-                t = expr._type; // Upgrade declared type to the exact extern decl type
-            } else if( isConstructorDecl(name) ) {
-                expr = constructorFunc(name);
-            } else {
-                expr = parseAsgn();
-            }
-            // var/val, then type comes from expression
-            if( inferType ) {
-                if( expr._type==Type.NIL )
-                    throw error("a not-null/non-zero expression");
-                t = expr._type;
-                if( !xfinal ) t = mutableInferredType(t);
-                // Instance fields may change until the constructor finishes.
-                // Keep the declared family/access, not the default's constant
-                // value or string contents. Class constants remain static.
-                else if( _scope.klast() instanceof Kind.Func fun && FunNode.isInstance(fun._name) && !(t instanceof TypeFunPtr) )
-                    t = constructorFieldType(t);
-            }
-
-            // expr is a constant function
-            if( t instanceof TypeFunPtr decl && expr._type instanceof TypeFunPtr tfp && tfp.isConstant() ) {
-                t = decl.makeFrom(tfp.fidx());
-                FunNode fun = _code.link(tfp);
-                if( fun != null )
-                    fun.setName(name); // Assign debug name to Simple function
-            }
-
-        } else {
-            // Since no initializer, not-final but might need an initializer
-
-            // Need an expression to infer the type.
-            // Also, if not-null then need an initializing expression.
-            // Allowed in a class def, because type/init will happen in the constructor.
-            if( (inferType || (t instanceof TypeNil tn && !tn.nullable() )) && !_scope.inConstructor() )
-                throw errorSyntax("=expression");
-            // Initial value for uninitialized struct fields.
-            expr = switch( t ) {
-                // Required pointers retain their declared shape, but include
-                // null until every constructor path assigns them.
-            case TypeNil tn -> tn.nullable() ? con(Type.NIL) : con(t.meet(Type.NIL));
-            case TypeInteger ti -> xfinal ? con(Type.BOTTOM) : _code.ZERO;
-            case TypeFloat tf -> con(xfinal ? Type.BOTTOM : TypeFloat.FZERO);
-            // Bottom signals type inference: they must be initialized in
-            // the constructor and that's when we'll discover the type.
-            case Type tt -> { assert tt==Type.BOTTOM; yield con(tt); }
-            };
-            // Every non-null pointer without a default is constructor-required.
-            // Without `!` it is also shallow-final; mutability and definite
-            // initialization are independent properties.
-            if( (xfinal && !(t instanceof TypeNil)) || (t instanceof TypeNil tn && !tn.nullable()) ) {
-                uninit = true;
-                if( xfinal ) fld_final = true;
-            }
-        }
-
-        // Lift expression, based on type
-        // Do not let an authoritative Convert hide the nullable
-        // not-yet-initialized state from constructor-local type flow.
-        Node lift = uninit ? expr : convertExpr(expr, t);
-
-        // Define a new name
-        if( !_scope.define(name,t,xfinal || fld_final,lift, loc) )
-            throw error("Redefining name '" + name + "'", loc);
-        _scope.lookup(name)._uninit = uninit;
-        return lift;
-    }
-
-
-    /**
-     * Parse a struct declaration, and return the following statement.
-     * Structs cannot be redefined, but can be nested.
-     *
-     * @return zero
-     */
-    private Node parseStruct( ) {
-        // keyword "struct" already parsed, so expect the struct name next.
-        String typeName = requireId();
-        require("{");
-
-        // create type class:NESTED.typeName; no fields.
-
-        String old = _nestedType;
-        String fullName = _scope.depth()==1 && _nestedType.endsWith(typeName) ? old : (old+"."+typeName).intern();
-        _nestedType = fullName; // Recursive structs start with this as their basename
-
-        ReturnNode ret = parseStruct( false, fullName );
-
-        _nestedType = old;
-
-        // Insert a field into class:NESTED.typeName of "val typeName = fcn-ptr-to-init"
-        // Function does malloc internally.
-        // Future self: means subtyping has to deal with "who does the malloc"
-        String clzName = addClzPrefix(fullName);
-        TypeFunPtr sig = ret.fun().sig();
-        TypeStruct ts = (TypeStruct)TYPES.get(clzName);
-        String initName = initFieldName(fullName);
-        Field oldFld = ts==null ? null : ts.field(initName);
-        Field fld = oldFld==null
-            ? Field.make(initName,sig,_code.alias(_ref._cname),true)
-            : oldFld.makeFrom(sig);
-        Field ctorFld = ts==null ? null : ts.field("<ctor>");
-        // A same-named struct shares its file's class object and flag.
-        Field flag = ts==null ? null : ts.field("$init");
-        ts = ctorFld==null
-            ? TypeStruct.make(clzName,false,fld)
-            : TypeStruct.make(clzName,false,fld,ctorFld);
-        if( flag!=null ) ts=ts.add(flag);
-        TypeFunPtr alloc = makeAllocator((TypeStruct)TYPES.get(fullName),ret,ctorFld);
-        ts = ts.add(Field.make("<new>",alloc,_code.alias(_ref._cname),true));
-        TYPES.put(clzName,ts);
-
-        // Insert a field in the containing class with the nested class type.
-        // This is basically sugar for "val CLZNAME = <init>"
-        // and is a nicer version of updateSelfAsFieldsDiscovered.
-        _scope.define(typeName, sig, true, new FunPtrNode(sig,_code._start,ret).peephole(), loc());
-
-        require("}");
-        return require(_code.ZERO,";");
-    }
-
-    // Build the declaration-side allocation helper.  Allocation sites only
-    // call this function; all layout, initialization and publication choices
-    // are made here, where the complete struct and constructor are known.
-    private TypeFunPtr makeAllocator(TypeStruct ts, ReturnNode initRet, Field ctorFld) {
-        TypeFunPtr ctor = ctorFld==null ? null : (TypeFunPtr)ctorFld._t;
-        int nargs = ctor==null ? 0 : ctor.nargs()-2; // Hide self and selfMem
-        Type[] atypes = new Type[nargs];
-        for( int i=0; i<nargs; i++ ) atypes[i] = ctor.arg(i+2);
-        TypeMemPtr ptr = TypeMemPtr.make(ts);
-        TypeFunPtr sig = TypeFunPtr.make1((byte)2,true,atypes,ptr,_code.fidx(_ref._cname));
-        String name = (ts._name+".<new>").intern();
-
-        int oldUID = _code.UID();
-        FunNode fun = (FunNode)new FunNode(loc(),sig,name,_ref,null,_ref._start).peephole();
-        _code.link(fun);
-        Node rpc = new ParmNode("$rpc",0,TypeRPC.BOT,fun,ConstantNode.seed(TypeRPC.BOT).peephole()).peephole();
-        Node pub = new ParmNode(ScopeNode.MEM0,1,TypeMem.BOT,fun,
-                                new ProjNode(_ref._start,1,ScopeNode.MEM0).peephole()).peephole();
-        Node[] parms = new Node[nargs];
-        for( int i=0; i<nargs; i++ )
-            parms[i] = new ParmNode("arg"+i,i+2,atypes[i],fun,ConstantNode.seed(atypes[i]).peephole()).peephole();
-
-        NewNode nnn = new NewNode(ts,fun,off(ts," len")).init();
-        Node self = new ProjNode(nnn,0,ts.str()).init();
-        Node priv = new ProjNode(nnn,1,"#selfMem").init();
-        Node[] initArgs = new Node[]{fun,pub,self,priv,
-            new FunPtrNode(initRet.fun().sig(),_code._start,initRet).peephole()};
-        CallEndNode cend = rawCall(initArgs,initRet.fun());
-        Node ctl = new CProjNode(cend,0,ScopeNode.CTRL).peephole();
-        pub = new ProjNode(cend,1,ScopeNode.MEM0).peephole();
-        priv = new ProjNode(cend,2,"#selfMem").peephole();
-
-        if( ctor != null ) {
-            Node[] cargs = new Node[nargs+5];
-            cargs[0]=ctl; cargs[1]=pub; cargs[2]=self; cargs[3]=priv;
-            for( int i=0; i<nargs; i++ ) cargs[i+4]=parms[i];
-            FunNode cfun = _code.link(ctor);
-            cargs[cargs.length-1] = new FunPtrNode(ctor,_code._start,cfun.ret()).peephole();
-            cend = rawCall(cargs,cfun);
-            ctl = new CProjNode(cend,0,ScopeNode.CTRL).peephole();
-            pub = new ProjNode(cend,1,ScopeNode.MEM0).peephole();
-            priv = new ProjNode(cend,2,"#selfMem").peephole();
-        }
-
-        priv.keep();
-        for( Field field : ts._fields ) {
-            Type storage = field._t.makeStorage();
-            Field escaped = field._final ? field : field.makeFrom(storage).makeFrom(true);
-            pub.keep();
-            Node esc = new EscapeNode(escaped,self,priv,pub).peephole();
-            MemMergeNode merge = new MemMergeNode(null,pub);
-            merge.alias(field._alias,esc);
-            Node next = merge.peephole();
-            pub.unkeep();
-            pub = next;
-        }
-        priv.unkill();
-        ReturnNode ret = (ReturnNode)new ReturnNode(ctl,pub,self,rpc,fun).peephole();
-        fun.setRet(ret);
-        fun._approxUIDs = _code.UID() - oldUID;
-        _ref.addFun(_code,fun);
-        return sig;
-    }
-
-    private CallEndNode rawCall(Node[] args, FunNode target) {
-        // Establish this known declaration-side edge immediately, but do not
-        // peephole or inline it while the surrounding factory is being built.
-        // IterPeeps therefore starts with the complete initializer caller set.
-        CallNode call = new CallNode(loc(),args).init();
-        CallEndNode cend = new CallEndNode(call,TypeRPC.constant(_code.rpc(_ref._cname))).init();
-        call.link(target);
-        return cend;
-    }
-
-    // Parse a struct declaration (not an allocation); file-level is a class-init, and scope structs are normal
-    private ReturnNode parseStruct( boolean isClz, String typeName ) {
-        var oldExits = _ctorExits;
-        _ctorExits = new ArrayList<>();
-        // Record & restore global state set during parsing the <init> code
-        Node oldCtrl= _scope.ctrl().keep();
-        Node oldMem = _scope.mem ().keep();
-
-        // Make the future clazz/instance struct.
-        TypeStruct tself = (TypeStruct)TYPES.get(typeName);
-        if( tself==null )
-            TYPES.put(typeName, tself = TypeStruct.make(typeName,true));
-        else {
-            assert tself._open;
-            TYPES.put(typeName,tself = tself.defined());
-        }
-
-        // Class object keeps a runtime flag to signal the <clinit> has run.
-        if( isClz )
-            TYPES.put(typeName,tself=tself.add(Field.make("$init",TypeInteger.BOOL,_code.alias(_ref._cname),false)));
-
-        // Signature of the default constructor
-        TypeFunPtr sig = structInitSig(isClz,tself);
-        // Function and argument names of default constructor
-        String fname = (typeName + (isClz ? ".<clinit>" : ".<init>")).intern();
-        String[] ids = new String[]{"self", isClz ? "arg" : "#selfMem"};
-
-        // Struct decls look like function bodies.  Parse function body normally.
-        ReturnNode ret = _parseFunctionBody(fname,sig,loc(),ids);
-        _ctorExits = oldExits;
-        // Unwind global state.
-        ctrl(oldCtrl.unkeep());
-        mem (oldMem .unkeep());
-        return ret;
-    }
-
-        // <cl/init> signature: { self arg/selfMem -> BOT/selfMem }
-        // Self-memory is the rare *private* (never aliased) memory for the new object.
-    private TypeFunPtr structInitSig( boolean isClz, TypeStruct tself ) {
-        // Private uninitialized memory from new object, no escaped values.
-        TypeMem privMem = isClz ? null : TypeMem.make(1,tself,true,isClz,false,null,null);
-        Type targ = isClz ? TypeInteger.BOT : privMem;
-        // Return for private memory has to name all escaped fields, which are not known yet.
-        // Escape ALL fields, and sharpen later.
-        Type tret = isClz ? Type.BOTTOM     : TypeMem.makePrivate(tself);
-        Type[] targs = new Type[]{ TypeMemPtr.make((byte)2,tself,isClz), targ };
-        // FIDX for FREFs is in the global namespace, needs the correct clz name.
-        String clzBare = tself._name;
-        int order = 3; // 3 is always the <init> order, 2nd in the file just behind the <clinit>
-        if( isClz ) {
-            assert startsClzPrefix( clzBare );
-            clzBare = clzBare.substring(clzPrefix.length()).intern();
-            order = 2; // 2 is always the <clinit> order, first in file and skipping reserved #1
-        }
-        return TypeFunPtr.make1((byte)2, true, targs, tret, _code.fidx(clzBare,order));
-    }
-
-    // A class type carries the constructor function as a required final field.
-    private TypeStruct classStruct( String typeName, TypeFunPtr init, boolean open ) {
-        return TypeStruct.make(addClzPrefix(typeName),open,Field.make(initFieldName(typeName),init,_code.alias(_ref._cname),true));
-    }
-
-    private static String initFieldName( String typeName ) {
-        if( startsClzPrefix(typeName) )
-            typeName = typeName.substring(clzPrefix.length());
-        int idx = typeName.lastIndexOf('.');
-        return (idx == -1 ? typeName : typeName.substring(idx+1)).intern();
-    }
-
-    private TypeStruct latestStruct( TypeStruct ts ) {
-        Type t = TYPES.get(ts._name);
-        return t instanceof TypeStruct ts2 ? ts2 : ts;
-    }
-
-    private Field fieldOrOpen( TypeStruct ts, String name, boolean xfinal ) {
-        ts = latestStruct(ts);
-        Field fld = ts.field(name);
-        if( fld != null ) return fld;
-        if( !ts._open || !ts._fref ) return null;
-        fld = Field.make(name,Type.BOTTOM,_code.alias(_ref._cname),xfinal);
-        TYPES.put(ts._name,ts = ts.add(fld));
-        if( _ctorOpenStruct != null && _ctorOpenStruct._name == ts._name )
-            _ctorOpenStruct = ts;
-        return fld;
-    }
-
-    private Var defineOpenConstructorField( String name ) {
-        if( _ctorOpenStruct==null ) return null;
-        Field fld = fieldOrOpen(_ctorOpenStruct,name,true);
-        if( fld == null ) return null;
-        _scope.define(name,fld._t,fld._final,con(Type.TOP),loc());
-        return _scope.lookup(name);
-    }
-
-
-    // Parse and return a type or null.  Valid types always are followed by an
-    // 'id' which the caller must parse.  This lets us distinguish forward ref
-    // types (which ARE valid here) from local vars in an (optional) forward
-    // ref type position.
-
-    // t = int|i8|i16|i32|i64|u8|u16|u32|u64|byte|bool | flt|f32|f64 | val | var | struct[?]
-
-    // Structs have nested names, and can be discovered with a partial name
-    // match.  Example, searching for a type name "C.D" in the namespace "A.B".
-    // This will match "A.B.C.D", then "A.C.D", then "C.D".
-
-    // Will also match external names like "sys.io" or "externModule.subtype.subtype"
-
-    private Type type() {
-        // Only type with a leading `{` is a function pointer...
-        if( peek('{') ) return typeFunPtr();
-
-        // Otherwise you get a type name
-        int old1 = pos();
-        boolean writable = match("!");
-        boolean readonly = !writable && match("~");
-        String tname = _lexer.matchId();
-        if( tname==null ) return posT(old1);
-
-        // Convert the type name to a type.
-        Type t0 = TYPES.get(tname), t1 = t0;
-        // No new types as keywords
-        if( KEYWORDS.contains(tname) ) {
-            if( t0 == null ) return posT(old1);
-            // Something like "int" or "f64" or "var".
-            // Can be "int[]" so still need to check array-ness
-        } else {
-            if( t0 == Type.BOTTOM || t0 == Type.TOP ) return t0; // var/val type inference
-
-            if( t0 != null ) {
-                while( true ) {
-                    int old2 = pos();
-                    if( !match(".") ) break;
-                    String sname = matchId();
-                    if( sname==null ) { pos(old2); break; }
-                    sname = tname+"."+sname;
-                    Type t = TYPES.get(sname);
-                    if( t==null ) { pos(old2); break; }
-                    tname = sname;
-                    t0 = t;
-                }
-            } else {
-                // Type A.B.C starts with just A.  Search our nested type path,
-                // e.g. path "X.Y.Z", in order:
-
-                // If A==X its now a local type.
-                //   If another dot, repeat for B==Y then C==Z
-                //   Else if AX.B exists, done
-                //   Else AX.B is a local forward ref.
-                //
-                // Else its a short cut form, one of:
-                //   X.Y.Z.A
-                //   X.Y.A
-                //   X.A
-                // Else this all failed, assume a forward ref with A as an external symbol:
-                //   A
-
-                String root = _nestedType;
-                int ridx = root.indexOf('.');
-                if( ridx != -1 ) root = root.substring(0,ridx);
-                if( tname.equals(root) ) {
-                    boolean localForward = false;
-                    while( true ) {
-                        int old2 = pos();
-                        if( !match(".") ) break;
-                        String sname = matchId();
-                        if( sname==null ) { pos(old2); break; }
-                        sname = tname+"."+sname;
-                        Type t = TYPES.get(sname);
-                        if( t==null && !(_nestedType.equals(tname) || _nestedType.startsWith(tname+".")) && !localForward ) {
-                            pos(old2);
-                            break;
-                        }
-                        tname = sname;
-                        t0 = t;
-                        localForward |= t==null;
-                    }
-                } else {
-                    String nest = _nestedType, fullq = tname;
-                    while( true ) {
-                        fullq = nest+"."+tname; // Full qualified name
-                        t0 = TYPES.get(fullq);
-                        if( t0 != null )
-                            { tname = fullq; break; } // Search succeeded
-                        // Subtract a layer from nested typenames
-                        int idx = nest.lastIndexOf('.');
-                        if( idx== -1 ) break; // Search failed; leave as an external symbol
-                        nest = nest.substring(0,idx);
-                    }
-                    if( t0==null ) {
-                        CompUnit cu = ParseAll.findCompUnit(_code,_ref,tname);
-                        if( cu != null ) {
-                            tname = cu._cname;
-                            t0 = TYPES.get(tname);
-                        }
-                        while( true ) {
-                            int old2 = pos();
-                            if( !match(".") ) break;
-                            String sname = matchId();
-                            if( sname==null ) { pos(old2); break; }
-                            tname = tname+"."+sname;
-                            t0 = TYPES.get(tname);
-                        }
-                    } else {
-                        while( true ) {
-                            int old2 = pos();
-                            if( !match(".") ) break;
-                            String sname = matchId();
-                            if( sname==null ) { pos(old2); break; }
-                            sname = tname+"."+sname;
-                            Type t = TYPES.get(sname);
-                            if( t==null ) { pos(old2); break; }
-                            tname = sname;
-                            t0 = t;
-                        }
-                    }
-                }
-            }
-
-            tname = tname.intern();
-            // Still no type found?  Assume forward reference
-            t1 = t0 == null
-                ? TypeStruct.forward(tname) // Null: assume a forward ref type
-                : t0;
-        }
-
-        // Structs are always actually references
-        if( t1 instanceof TypeStruct ts1 )
-            t1 = TypeMemPtr.make(ts1);
-
-        // A qualifier before the name applies to the struct reference, not
-        // to an enclosing array. Arrays have their own [] / [~] qualifier.
-        if( t1 instanceof TypeMemPtr tmp ) {
-            if( readonly || !writable ) t1 = tmp.makeRO();
-        } else if( writable || readonly )
-            return posT(old1);
-
-        // Nest arrays and '?' as needed
-        Type t2 = t1;
-        while( true ) {
-            if( match("?") ) {
-                if( t2 instanceof TypeMemPtr tmp ) {
-                    if( tmp.nullable() ) throw error("Type "+t2+" already allows null");
-                    t2 = tmp.makeNullable();
-                } else
-                    throw error("Type "+t0+" cannot be null");
-            } else if( match("[~]") ) {
-                t2 = TypeMemPtr.make(typeAry(t2,true)).makeRO();
-            } else if( match("[]") ) {
-                t2 = TypeMemPtr.make(typeAry(t2,false));
-            } else
-                break;
-        }
-
-        // Check no forward ref
-        if( t0 != null ) return t2;
-        // Check valid forward ref, after parsing all the type extra bits.
-        // Cannot check earlier, because cannot find required 'id' until after "[]?" syntax
-        int old2 = pos();
-        if( !match("!") ) match("~");
-        String id = _lexer.matchId();
-        if( !(peek(',') || peek(';') || peek('=') || match("->")) || id==null )
-            return posT(old1);  // Reset lexer to reparse
-        pos(old2);              // Reset lexer to reparse
-        // Yes a forward ref, so declare it
-        forwardRefType(tname,(TypeStruct)((TypeMemPtr)t1)._obj);
-        // Return the (array, final) type
-        return t2;
-    }
-
-    private TypeMemPtr forwardRefType( String tname, TypeStruct tself ) {
-        TYPES.put(tname,tself);
-        String clzName = addClzPrefix( tname );
-        TYPES.put(clzName, classStruct(tname,structInitSig(false,tself),true));
-        return TypeMemPtr.make(tself);
-    }
-
-    private TypeMemPtr forwardRefType( String tname ) {
-        tname = fullTypeName(tname);
-        return forwardRefType(tname,TypeStruct.forward(tname));
-    }
-
-    private String fullTypeName( String tname ) {
-        String nest = _nestedType, fullq;
-        while( true ) {
-            fullq = nest+"."+tname;
-            if( TYPES.get(fullq) != null )
-                return fullq.intern();
-            int idx = nest.lastIndexOf('.');
-            if( idx== -1 ) return fullq.intern();
-            nest = nest.substring(0,idx);
-        }
-    }
-
-    // Make an array type of t.  Always record a mutable version,
-    // but return the requested version.
-    private TypeStruct typeAry( Type t, boolean efinal ) {
-        // Non-null reference arrays are valid types, even though an ordinary
-        // zero-filled `new T[len]` cannot construct one.  Allocation retains
-        // that check in alloc(); trusted runtimes (notably argv construction)
-        // may fill the private array completely before publishing it.
-        String tname = ("[]"+t.str()).intern();
-        TypeStruct ta = (TypeStruct)TYPES.get(tname);
-        if( ta==null ) {
-            // Primitive arrays use the null compunit
-            String rcname = TYPES.get(t) instanceof TypeStruct ? _ref._cname : ("_."+t).intern();
-            ta = TypeStruct.makeAry(tname,TypeInteger.U32,_code.alias(rcname),t,_code.alias(rcname), false );
-            TYPES.put(tname,ta);
-        }
-        // Already have the aliases, just efinal is wrong
-        return TypeStruct.makeAry(tname,TypeInteger.U32,ta._fields[0]._alias,t,ta._fields[1]._alias,efinal );
-    }
-
-    private Type implicitSelfType() {
-        TypeStruct self = _scope.constructorSelf();
-        // Ordinary instance methods accept the declared object shape.  The
-        // constructor-only receiver starts at the low/default field values,
-        // and is built explicitly by constructorFunc().
-        return self == null ? TypePtr.PTR : TypeMemPtr.make(self);
-    }
-
-    // A function type is `{ type... -> type }` or `{ type }`.
-    private Type typeFunPtr() {
-        int old = pos();        // Record lexer position
-        match("{");             // Skip already-peeked '{'
-        Type t0 = type();       // Either return or first arg
-        if( t0==null ) return posT(old); // Not a function
-        Ary<Type> ts = new Ary<>(Type.class);
-        // Always reserve a receiver slot.  Outside constructor scopes it is
-        // broad and unused, so call sites can uniformly pass their self.
-        ts.push(implicitSelfType());
-        if( match("}") )                 // No-arg function { -> type }
-            return TypeFunPtr.make(match("?"),ts.asAry(),t0);
-        ts.push(t0);            // First argument
-        while( true ) {
-            if( match("->") ) { // End of arguments, parse return
-                Type ret = type();
-                if( ret==null || !match("}") )
-                    return posT(old); // Not a function
-                return TypeFunPtr.make(match("?"),ts.asAry(),ret);
-            }
-            Type t1 = type();
-            if( t1==null ) return posT(old); // Not a function
-            ts.push(t1);
-        }
-    }
-
-    // True if a TypeFunPtr, without advancing parser
-    private boolean isTypeFun() {
-        int old = pos();
-        if( typeFunPtr()==null ) return false;
-        pos(old);
-        return true;
-    }
-
-    /**
-     * Parse an expression of the form:
-     *
-     * <pre>
-     *     expr : bitwise [? expr [: expr]]
-     * </pre>
-     * @return an expression {@link Node}, never {@code null}
-     */
-    private Node parseExpression() {
-        Node expr = parseLogical();
-        return match("?") ? parseTrinary(expr,":") : expr;
-    }
-
-    /**
-     * Parse an bitwise expression
-     *
-     * <pre>
-     *     bitwise : compareExpr (('&' | '|' | '^') compareExpr)*
-     * </pre>
-     * @return a bitwise expression {@link Node}, never {@code null}
-     */
-
-    private Node parseLogical() {
-        Node lhs = parseBitwise();
-        while (true) {
-            if( false ) ;
-            else if( match("&&") ) lhs = parseTrinary(lhs, "&&");
-            else if( match("||") ) lhs = parseTrinary(lhs, "||");
-            else break;
-        }
-        return lhs;
-    }
-
-    private Node parseBitwise() {
-        Node lhs = parseEquality();
-        while( true ) {
-            if( false ) ;
-            else if( matchOp('&') ) lhs = new AndNode(loc(),lhs,null);
-            else if( matchOp('|') ) lhs = new  OrNode(loc(),lhs,null);
-            else if( match  ("^") ) lhs = new XorNode(loc(),lhs,null);
-            else break;
-            lhs.setDef(2,parseEquality());
-            lhs = peep(lhs);
-        }
-        return lhs;
-    }
-
-
-    /**
-     * Parse an eq/ne expression
-     */
-    private Node parseEquality() {
-        Node lhs = parseComparison();
-        while( true ) {
-            boolean eq = false;
-            if( match("==") ) eq = true;
-            else if( !match("!=") ) break;
-            lhs.keep();
-            Node rhs = parseComparison();
-            lhs = peep(new BoolNode.EQ(lhs.unkeep(),rhs));
-            if( !eq ) lhs = peep(new NotNode(lhs));
-        }
-        return lhs;
-    }
-
-    /**
-     * Parse an expression of the form:
-     *
-     * <pre>
-     *     expr : shiftExpr < shiftExpr <= shiftExpr...
-     *     expr : shiftExpr > shiftExpr >= shiftExpr...
-     * </pre>
-     * @return an comparator expression {@link Node}, never {@code null}
-     */
-    private Node parseComparison() {
-        Node lhs = parseShift();
-        int dir = parseCompDir();
-        // No compare
-        if( dir==0 ) return lhs;
-        lhs.keep();
-
-        // Compare
-        Node rhs = parseShift().keep();
-        Node cmp = makeCompBool(dir,lhs.unkeep(),rhs).keep(); // Convert to a bool
-
-        // Stacked compares?
-        int dir0 = parseCompDir();
-        if( dir0 == 0 ) {
-            rhs.unkill();
-            return cmp.unkeep();
-        }
-
-        // rhs is keeped() and becomes lhs
-        // cmp is NOT keeped() and is the last test
-        Node ifNode = new IfNode(ctrl(), cmp.unkeep()).peephole();
-        Node ifT = new CProjNode(ifNode.  keep(), 0, "True" ).peephole().keep();
-        Node ifF = new CProjNode(ifNode.unkeep(), 1, "False").peephole();
-        // False side does nothing but capture memory & side-effects
-        ScopeNode fail = _scope.dup();
-        fail.ctrl(ifF);
-
-        // Loop over stacked compares.  Each loop moves the old RHS to become
-        // the new LHS, so e.g. (a < b < c < d) compares (LHS:a < RHS:b) then
-        // compares (LHS:b < RHS:c) then (LHS:c < RHS:d), etc.
-        while( dir0 != 0 ) {
-            if( Math.abs(dir) != Math.abs(dir0) )
-                throw error("Mixing relational directions in a chained relational test");
-            // True side parses next arm of test
-            ctrl(ifT.unkeep());
-            lhs = rhs;          // lhs is keeped() and is old RHS
-            rhs = parseShift().keep();
-            cmp = makeCompBool(dir,lhs.unkeep(),rhs); // Convert to a bool
-            ifNode = new IfNode(ctrl(), cmp).peephole();
-            ifT = new CProjNode(ifNode.  keep(), 0, "True" ).peephole().keep();
-            ifF = new CProjNode(ifNode.unkeep(), 1, "False").peephole();
-            // Merge result into the fail case
-            ctrl(ifF);
-            fail.mergeScopes(_scope.dup(), loc()).peephole();
-            // Check next stacked compare
-            dir0 = parseCompDir();
-        }
-        rhs.unkill();
-        ctrl(ifT.unkeep());
-        RegionNode r = fail.mergeScopes(_scope, loc()).init();
-        _scope = fail;
-        return new PhiNode("", r,_code.ZERO,con(1)).peephole();
-    }
-
-    private int parseCompDir() {
-        if( match("<=") ) return -1; // Negative for "equals-or-less"
-        if( match(">=") ) return -2; // 1 for <, 2 for >
-        if( match("<" ) ) return  1; // Positive for just "less"
-        if( match(">" ) ) return  2;
-        return 0;
-    }
-
-    private Node makeCompBool( int dir0, Node lhs, Node rhs ) {
-        // Convert to a bool
-        if( Math.abs(dir0)==2 ) // Swap direction
-            { Node tmp = lhs; lhs = rhs; rhs = tmp; }
-        lhs = peep(dir0 < 0 ? new BoolNode.LE(lhs,rhs) : new BoolNode.LT(lhs,rhs));
-        return peep(lhs);
-    }
-
-    /**
-     * Parse an additive expression
-     *
-     * <pre>
-     *     shiftExpr : additiveExpr (('<<' | '>>' | '>>>') additiveExpr)*
-     * </pre>
-     * @return a shift expression {@link Node}, never {@code null}
-     */
-    private Node parseShift() {
-        Node lhs = parseAddition();
-        while( true ) {
-            if( false ) ;
-            else if( match("<<") ) lhs = new ShlNode(loc(),lhs,null);
-            else if( match(">>>")) lhs = new ShrNode(loc(),lhs,null);
-            else if( match(">>") ) lhs = new SarNode(loc(),lhs,null);
-            else break;
-            lhs.setDef(2,parseAddition());
-            ParseException err;
-            if( (err=lhs.err()) != null )
-                throw err;
-            lhs = peep(lhs);
-        }
-        return lhs;
-    }
-
-    /**
-     * Parse an additive expression
-     *
-     * <pre>
-     *     additiveExpr : multiplicativeExpr (('+' | '-') multiplicativeExpr)*
-     * </pre>
-     * @return an add expression {@link Node}, never {@code null}
-     */
-    private Node parseAddition() {
-        Node lhs = parseMultiplication();
-        while( true ) {
-            if( false ) ;
-            else if( match("+") ) lhs = new AddNode(lhs,null);
-            else if( match("-") ) lhs = new SubNode(lhs,null);
-            else break;
-            lhs.setDef(2,parseMultiplication());
-            lhs = peep(lhs);
-        }
-        return lhs;
-    }
-
-    /**
-     * Parse an multiplicativeExpr expression
-     *
-     * <pre>
-     *     multiplicativeExpr : unaryExpr (('*' | '/') unaryExpr)*
-     * </pre>
-     * @return a multiply expression {@link Node}, never {@code null}
-     */
-    private Node parseMultiplication() {
-        var lhs = parseUnary();
-        while( true ) {
-            if( false ) ;
-            else if( match("*") ) lhs = new MulNode(lhs,null);
-            else if( match("/") ) lhs = new DivNode(lhs,null);
-            else break;
-            lhs.setDef(2,parseUnary());
-            lhs = peep(lhs);
-        }
-        return lhs;
-    }
-
-    /**
-     * Parse a unary minus expression.
-     *
-     * <pre>
-     *     unaryExpr : ('-') unaryExpr | '!') unaryExpr | postfixExpr | primaryExpr | '--' Id | '++' Id
-     * </pre>
-     * @return a unary expression {@link Node}, never {@code null}
-     */
-    private Node parseUnary() {
-        // Pre-dec/pre-inc
-        int old = pos();
-        if( match("--") || match("++") ) {
-            int delta = _lexer.peek(-1)=='+' ? 1 : -1; // Inc vs Dec
-            String name = _lexer.matchId();
-            if( name!=null ) {
-                Var n = _scope.lookup(name);
-                if( n != null && !(n.type() instanceof TypeMemPtr) ) {
-                    if( n._extern!=0 )
-                        return parsePostfixName(_scope.in(n),name,delta);
-                    if( n._final && !_scope.canInit(n) )
-                        throw error("Cannot reassign final '"+n._name+"'");
-                    checkSharedFunction(n);
-                    Node expr = convertExpr(peep(new AddNode(_scope.in(n),con(delta))),n.type());
-                    _scope.update(n,expr);
-                    return expr;
-                }
-            }
-            // Reset, try again
-            pos(old);
-        }
-        if (match("-")) return peep(new MinusNode(parseUnary()));
-        if (match("!")) return peep(new   NotNode(parseUnary()));
-        // Else be a primary expression
-        return parsePrimary();
-    }
-
-    /**
-     * Parse a primary expression:
-     *
-     * <pre>
-     *     primaryExpr : integerLiteral | "string" | 'char' | true | false | null |
-     *                   new Type | '(' expression ')' | Id['++','--'] |
-     *                   type['.' Id]*
-     * </pre>
-     * @return a primary {@link Node}, never {@code null}
-     */
-    private Node parsePrimary() {
-        if( _lexer.isNumber(_lexer.peek()) ) return parseLiteral();
-        if( _lexer.peek('"') ) return parsePostfix(newString(parseString()));
-        if( matchx("true" ) ) return con(1);
-        if( matchx("false") ) return _code.ZERO;
-        if( matchx("null" ) ) return con(Type.NIL);
-        if( match ("'"    ) ) return parseChar();
-        if( match ("("    ) ) return parsePostfix(require(parseAsgn(), ")"));
-        if( matchx("new"  ) ) return parsePostfix(alloc());
-        if( match ("{"    ) ) return parsePostfix(require(func(),"}"));
-
-        int pos = pos();
-        // Expect an identifier now
-        String id = _lexer.matchId();
-        if( id == null || KEYWORDS.contains(id) )
-            throw errorSyntax("an identifier or expression");
-        int pos2 = pos();
-        // Attempt a local var lookup first
-        Var var = _scope.lookup(id);
-        if( var==null ) {
-            // Not a local var, try again as a type name
-            pos(pos);
-            Type t = type();
-            if( t!=null ) {
-                // Static <clinit> typename lookup
-                if( peek('.') ) // type.fld, which is really a field lookup in the class object
-                    return parsePostfix(con(t));
-                // Direct reference to a <clinit> type.  Convert the instance
-                // type to a class type name
-                if( !(t instanceof TypeMemPtr tmp) ) {
-                    //return new FRefNode(addClzPrefix(tmp._obj._name), loc()).peephole();
-                    // Not a local var, but yes a bare type... disallow a local
-                    // FREF and return null, not-a-primary parse.
-                    pos(pos);
-                    return null;
-                }
-            }
-
-            // Insert FREF outside enclosing Kind.Func scope.
-            pos(pos2);
-            t = FRefNode.FREF_TYPE;
-            // Check if this is a class.
-            CompUnit cu = ParseAll.findCompUnit(_code,_ref,id);
-            if( cu!=null ) {
-                // Must be a final class-type
-                String clzName = addClzPrefix(cu._cname);
-                TypeStruct clz = (TypeStruct)TYPES.get(clzName);
-                if( clz == null )
-                    TYPES.put(clzName,clz = TypeStruct.make(clzName,true));
-                t = TypeMemPtr.make((byte)2,clz,true);
-            }
-            // Define the FRef
-            var = _scope.defineFRef(id,t,true,loc());
-            _frefs.push((FRefNode)_scope.in(var));
-        }
-
-        // Load local value
-        Node rvalue = _scope.in(var);
-        if( var._extern!=0 )
-            return parsePostfixName(rvalue,id,0);
-        if( var._fref )
-            return parsePostfix(rvalue);
-        // A constructor may read the unfinished object, but each field it
-        // reads must already be initialized on every path. Read the current
-        // local value; other fields may still be waiting for their first write.
-        if( inExplicitConstructor() && var._uninit && missingInit(rvalue,new BitSet()) )
-            throw error("Field '"+id+"' might not be initialized",var._loc);
-
-        // Check for an instance field load
-        int kx = _scope.kindx(var); // Declaration scope
-        int fx = _scope.enclosingFunction(); // Enclosing function scope
-        Kind kk = _scope._kinds.at(kx);
-        Kind fk = _scope._kinds.at(fx);
-        // Access instance field from 'self'
-        if( kx+1 == fx && kk instanceof Kind.Func inst && FunNode.isInstance(inst._name) && fk instanceof Kind.Func method && !inExplicitConstructor() )
-            return parsePostfixName(_scope.in(method._lexSize),id,0);
-
-        // Check for a function-escaping variable; these require true
-        // closures.  Final constants are OK; final vars require a hidden var
-        // argument; not-final fields can just use an explicit struct arg.
-        if( kx < fx && !inExplicitConstructor() && // Out of scope
-            !(var._final && rvalue._type.isConstant()) ) { // Not a final constant
-            if( kx > 0  ) // Global scope is OK, only ever one of these (not one per function invoke)
-                throw error("Variable '"+var._name+"' is out of function scope and must be a final constant");
-
-            // var.idx==2 is self argument, 3 is args, 4 or more are now static globals
-            if( var._idx >= 4 ) {
-                // Read from global scope.
-                // Surely a nicer way to get the top-level scope compile name?
-                Var clzptr = _scope.var( 2 );
-                // Get the most recent sharpen global
-                TypeStruct clz = (TypeStruct) TYPES.get( ((TypeMemPtr) clzptr.type())._obj._name );
-                TypeMemPtr clztmp = TypeMemPtr.make( (byte) 2, clz, true );
-                return parsePostfixName( con( clztmp ), id,0 );
-                //return parsePostfixName(_scope.in(2),id);
-            }
-        }
-
-        // Check for assign-update, x += e0;
-        char ch = _lexer.matchOperAssign();
-        if( ch==0  ) {          // Normal primary, check for postfix updates
-            int selfx = _scope.kindFcn(var)._lexSize;
-            // Might be a method call from inside a method, so no explicit "self".
-            // Pass the in-scope "self"
-            return parsePostfixMethod(rvalue,_scope.in(_scope.update(_scope.var(selfx),null)));
-        }
-        // Assign-update direct into Scope
-        if( var._final && !_scope.canInit(var) )
-            throw error("Cannot reassign final '"+var._name+"'");
-        checkSharedFunction(var);
-        Node op = opAssign(ch,rvalue, var.type() );
-        _scope.update(var,op);
-        return postfix(ch) ? rvalue.unkeep() : op;
-    }
-
-    // Check for assign-update, "x += e0".
-    // Returns "x + e0"; the caller assigns value.
-    // if ch is postfix, then lhs is kept and caller will unkeep and return it.
-    private Node opAssign( char ch, Node lhs, Type t ) {
-        // RHS of the update.
-        lhs.keep();             // Alive across parseAsgn
-        Node rhs =
-            (byte)ch ==  1 ? con( 1) : // var++
-            (byte)ch == -1 ? con(-1) : // var--
-            parseAsgn();               // var op= rhs
-        if( !postfix(ch) ) lhs.unkeep();   // Allow to die in next peep
-        // 4 cases:
-        // int + int ==>> narrow int
-        // int + flt ==>> error, caller must fail assigning flt into int
-        // flt + int ==>> use float op, wrap toFloat()
-        // flt + flt ==>> use float op
-        Node op = switch(ch) {
-        case 1, (char)-1,
-             '+'        -> new AddNode(lhs,rhs);
-        case '-'        -> new SubNode(lhs,rhs);
-        case '*'        -> new MulNode(lhs,rhs);
-        case '/'        -> new DivNode(lhs,rhs);
-        case '|'        -> new  OrNode(null,lhs,rhs);
-        case '&'        -> new AndNode(null,lhs,rhs);
-        case '^'        -> new XorNode(loc(),lhs,rhs);
-        case Lexer.SHL  -> new ShlNode(loc(),lhs,rhs);
-        case Lexer.SAR  -> new SarNode(loc(),lhs,rhs);
-        case Lexer.SHR  -> new ShrNode(loc(),lhs,rhs);
-        default         -> throw TODO();
-        };
-        // Convert to float ops, or narrow int types; error if not declared type.
-        // Also, if postfix LHS is still keep()
-        return convertExpr(peep(op),t);
-    }
-
-
-    /**
-       Parse an allocation
-     */
-    private Node alloc() {
-        Type t = type();
-        if( t==null ) {
-            String tname = _lexer.matchId();
-            if( tname==null || KEYWORDS.contains(tname) )
-                throw error("Expected a type");
-            t = forwardRefType(tname);
-        }
-        // Parse ary[ length_expr ]
-        if( match("[") ) {
-            if( !t.makeZero().isa(t) )
-                throw error("Cannot allocate a non-nullable, since arrays are always zero/null filled");
-            Node len = parseAsgn().keep();
-            require("]");
-            return allocArray(typeAry(t,false),len);
-        } else {
-            if( !(t instanceof TypeMemPtr tmp) )
-                throw error("Cannot allocate a "+t.str());
-            return allocStruct(tmp._obj);
-        }
-    }
-
-    private Node allocStruct(TypeStruct ts) {
-        Ary<Node> ctorArgs = constructorArgs();
-        // A field declaration can leave a short forward type name in TYPES.
-        // Allocation happens in lexical context, so resolve that short name
-        // to the completed nested type before selecting its class helper.
-        String typeName = ts._name.indexOf('.') == -1 ? fullTypeName(ts._name) : ts._name;
-        Type resolved = TYPES.get(typeName);
-        if( resolved instanceof TypeStruct rts ) ts = rts;
-        TypeStruct clz = (TypeStruct)TYPES.get(addClzPrefix(typeName));
-        if( clz==null )
-            throw error("Unknown struct type '" + ts._name + "'");
-        Field afld = clz.field("<new>");
-        Node alloc;
-        if( afld != null ) {
-            TypeFunPtr tfp = (TypeFunPtr)afld._t;
-            FunNode fun = _code.link(tfp);
-            alloc = fun==null
-                ? new FRefNode((addClzPrefix(typeName)+".<new>").intern(),loc())
-                : new FunPtrNode(tfp,_code._start,fun.ret()).peephole();
-        } else {
-            if( !ts._fref )
-                throw error("Constructor arguments for '" + ts._name + "' but no constructor is defined");
-            Type[] sig = new Type[ctorArgs._len];
-            for( int i=0; i<ctorArgs._len; i++ )
-                sig[i] = ctorArgs.at(i)._type;
-            alloc = new FRefNode((addClzPrefix(typeName)+".<new>").intern(),loc(),
-                                 TypeFunPtr.make(false,sig,TypeMemPtr.make(ts)));
-        }
-        Ary<Node> args = new Ary<>(Node.class);
-        args.add(ctrl()); args.add(mem());
-        for( Node arg : ctorArgs ) args.add(arg.unkeep());
-        args.add(alloc);
-        return functionCall(args);
-    }
-
-    private Ary<Node> constructorArgs() {
-        Ary<Node> args = new Ary<>(Node.class);
-        if( !match("(") )
-            return args;
-        while( !peek(')') ) {
-            Node arg = parseAsgn();
-            if( arg==null ) break;
-            args.push(arg.keep());
-            if( !match(",") ) break;
-        }
-        require(")");
-        return args;
-    }
-
-    private Node allocArray(TypeStruct ts, Node len) {
-        Field  lenFld = ts.field("#" );
-        Field bodyFld = ts.field("[]");
-
-        ConFldOffNode base = off(ts, "[]");
-        int scale = ts.aryScale();
-        Node size = peep(new AddNode(base,peep(new ShlNode(null,len,con(scale)))));
-
-        // Build a NewNode; takes in and puts out all aliases.
-        NewNode nnn = new NewNode(ts, ctrl(), size ).init();
-        ProjNode self = new ProjNode(nnn,0,ts.str()).init().keep();
-        ProjNode smem = new ProjNode(nnn,1,"#selfMem").init().keep();
-
-        // Store length.  Rest of array is zero'd via CALLOC during CodeGen.
-        // Length is casted to sanity.
-        // TODO: Needs runtime check.
-        Node st = peep(new StoreNode(null, "#", 1, TypeInteger.U32, null, smem, self, off(ts,"#"), len.unkeep(), true));
-
-        // TODO: Allow add-on "constructor" to init the array elements
-
-        Node prior = mem();
-        Node esc = peep(new EscapeNode(lenFld,self,st,prior));
-        mem(mergeAlias(prior,lenFld._alias,esc));
-        prior = mem();
-        esc = peep(new EscapeNode(bodyFld,self,smem,prior));
-        mem(mergeAlias(prior,bodyFld._alias,esc));
-        smem.unkeep();
-        return self.unkeep();
-    }
-
-    private Node newString(String s) {
-        TypeStruct ts = typeAry(TypeInteger.U8,true);
-        int  lenAlias = ts.field("#" )._alias;
-        int elemAlias = ts.field("[]")._alias;
-        TypeConAryB body = TypeConAryB.make(s);
-        TypeInteger slen = TypeInteger.constant(s.length());
-        // Make a TMP, not-null (byte)2, singleton (true) (requires text
-        // strings are hash-interned), with a TypeStruct having a constant
-        // array body.
-        TypeMemPtr str = TypeMemPtr.make((byte)2,TypeStruct.makeAry("[]u8", slen, lenAlias, body, elemAlias, true),true);
-        assert str.isConstant();
-        return con(str.makeRO());
-    }
-
-    /**
-     * Parse postfix expression; this can be a field expression, an array
-     * lookup or a postfix operator like '#'
-     *
-     * <pre>
-     *     expr ('.' FIELD)* [ = expr ]       // Field reference
-     *     expr '#'                           // Postfix unary read operator
-     *     expr ['++' | '--' ]                // Postfix unary write operator
-     *     expr ('[' expr ']')* = [ = expr ]  // Array reference
-     *     expr '(' [args,]* ')'              // Function call
-     * </pre>
-     */
-    private Node parsePostfixMethod(Node expr, Node self) {
-        // TODO: This is too broad because the parser lacks strong types here.
-        // Some normal functions can end up with a "self" argument.
-
-        // Self method call?  Self is a TMP-not-CLZ, then assume and pass self.
-        if( match("(") ) {
-            expr = parsePostfix(require(functionCall(expr,self),")"));
-        } else if( expr != self )
-            self.isKill();      // Not a method call, no need for self
-        return parsePostfix(expr);
-    }
-    private Node parsePostfix(Node expr) {
-        _lexer.skipWhiteSpace();
-        Lexer site = loc();
-        String name;
-        if( match(".") )      name = requireId();
-        else if( match("#") ) name = "#";
-        else if( match("[") ) name = "[]";
-        // Can get here without an explicit receiver: "f()" or
-        // "self.method()(next)(next)(next)".  Pass the current function self.
-        else if( match("(") ) return parsePostfix(require(functionCall(expr,defaultSelf()),")"));
-        else return expr;       // No postfix
-
-        return parsePostfixName(expr,name,0,site);
-    }
-
-    private boolean privateSelf(Node ptr) {
-        while( ptr instanceof ConvertNode || ptr instanceof ReadOnlyNode || ptr instanceof GuardNode ) ptr=ptr.in(1);
-        Node self=defaultSelf();
-        while( self instanceof ConvertNode || self instanceof ReadOnlyNode || self instanceof GuardNode ) self=self.in(1);
-        return ptr==self;
-    }
-
-    // An explicit self.x read sees the same current value as bare x. Loading
-    // the allocation here would miss updates still held in local SSA values.
-    private Node privateField(String name, int pre) {
-        int idx=fieldVarIdxBefore(_scope._kinds.at(_scope.enclosingFuncOrDecl())._lexSize,name);
-        if( idx<0 ) throw error("Cannot resolve field '"+name+"'");
-        Var v=_scope.var(idx);
-        if( pre==0 && matchOpx('=','=') ) {
-            checkSharedFunction(v);
-            Node value=parseAsgn().keep();
-            _scope.update(v,convertExpr(value,v.type()));
-            return value.unkeep();
-        }
-        Node value=_scope.in(_scope.update(v,null));
-        if( v._uninit && missingInit(value,new BitSet()) )
-            throw error("Field '"+name+"' might not be initialized",v._loc);
-        char ch=pre==0 ? _lexer.matchOperAssign() : (char)pre;
-        if( ch!=0 ) {
-            checkSharedFunction(v);
-            Node op=opAssign(ch,value,v.type());
-            _scope.update(v,op);
-            if( pre!=0 && postfix(ch) ) value.unkeep();
-            return pre==0 && postfix(ch) ? value.unkeep() : op;
-        }
-        return parsePostfixMethod(value,defaultSelf());
-    }
-
-    private void checkSharedFunction(Var v) {
-        if( _scope.canInit(v) && v._final && v.type() instanceof TypeFunPtr t && t.isConstant() )
-            throw error("Cannot reassign shared function '"+v._name+"'");
-    }
-
-    // A loop Phi is temporarily bottom before its backedge is parsed. That is
-    // not an unwritten field: follow its live inputs to the actual defaults.
-    private boolean missingInit(Node value, BitSet seen) {
-        if( value==null || seen.get(value._nid) ) return false;
-        seen.set(value._nid);
-        if( value instanceof PhiNode phi && !(value instanceof ParmNode) ) {
-            for( int i=1; i<phi.nIns(); i++ )
-                if( phi.region().in(i)!=null && phi.region().in(i)._type!=Type.XCONTROL && missingInit(phi.in(i),seen) )
-                    return true;
-            return false;
-        }
-        return !initialized(value._type);
-    }
-
-    private Node defaultSelf() {
-        int selfx = _scope._kinds.at(_scope.enclosingFuncOrDecl())._lexSize;
-        return _scope.in(_scope.update(_scope.var(selfx),null));
-    }
-
-    /**
-     * Parse postfix expression; this can be a field expression, an array
-     * lookup or a postfix operator like '#'
-     *
-     * <pre>
-     *     expr ['++' | '--' ]                 // Postfix unary write operator
-     *     expr [ [op]= expr ]                 // Field reference
-     *     expr ('[' expr ']')* [ [op]= expr ] // Array reference
-     * </pre>
-     */
-
-    // pre is +/-1 for a prefix update, otherwise parse a postfix operation.
-    private Node parsePostfixName(Node expr, String name, int pre) {
-        return parsePostfixName(expr,name,pre,loc());
-    }
-
-    private Node parsePostfixName(Node expr, String name, int pre, Lexer site) {
-        if( inExplicitConstructor() && privateSelf(expr) ) return privateField(name,pre);
-        // Keep expr across possible updates
-        expr.keep();
-
-        // Get the best known TypeStruct from a pointer type.
-        TypeStruct ts = null, ts2;
-        if( expr._type instanceof TypeMemPtr tmp && (ts2=((TypeStruct)TYPES.get(tmp._obj._name))) != null )
-            ts = (TypeStruct)tmp._obj.join(ts2);
-        // A Load's flow type is intentionally not promised during parsing,
-        // but its declaring field type is still known.  Recover that static
-        // type for chained accesses such as `_grow(1).buf[len++]`; otherwise
-        // the array Store is parsed as alias #1 and can hide the independent
-        // side effect of the postfix `len++`.
-        if( ts==null && expr instanceof LoadNode load ) {
-            TypeStruct ots = load.off() instanceof ConFldOffNode coff ? coff._ts : null;
-            if( ots==null && load.ptr()._type instanceof TypeMemPtr owner ) {
-                Type owner0 = TYPES.get(owner._obj._name);
-                ots = owner0 instanceof TypeStruct obj ? obj : owner._obj;
-            }
-            if( ots != null ) {
-                Field loaded = ots.field(load._name);
-                if( loaded != null && loaded._t instanceof TypeMemPtr ltmp ) {
-                    Type loaded0 = TYPES.get(ltmp._obj._name);
-                    ts = loaded0 instanceof TypeStruct obj ? obj : ltmp._obj;
-                }
-            }
-        }
-
-        Field fld = ts==null ? null : ts.field(name);
-        if( fld==null && ts!=null && !startsClzPrefix(ts._name) ) {
-            Type clz0 = TYPES.get(addClzPrefix(ts._name));
-            if( clz0 instanceof TypeStruct clz && (fld = latestStruct(clz).field(name)) != null ) {
-                expr.unkeep();
-                ts = latestStruct(clz);
-                expr = con(TypeMemPtr.make((byte)2,ts,true)).keep();
-            }
-        }
-        if( fld==null && ts!=null )
-            fld = fieldOrOpen(ts,name,false);
-        if( fld==null && ts!=null && !latestStruct(ts)._open )
-            throw error("Accessing unknown field '"+name+"' from '*"+ts._name+"'");
-
-        // We have to record "active touches" of a new class, to track when we
-        // need to force class initialization.  Basically, we insert an CLInit,
-        // and if it does not fold away it'll turn into a runtime check.
-        Kind.Func func = (Kind.Func)_scope._kinds.at(_scope.enclosingFuncOrDecl());
-        if( (ts==null || ts==TypeStruct.BOT || ts.isHigh() || startsClzPrefix(ts._name)) &&
-            !(ts!=null && (ts._name+".<clinit>").equals(func._name)) )
-            classInit(site,expr);
-
-        // With no field, we will update the bulk memory
-        int alias = fld==null ?  1          : fld._alias;
-        Type decl = fld==null ? Type.BOTTOM : fld._t;
-
-        // Field offset; fixed for structs, computed for arrays
-        Node off = (name=="[]"
-            // Array element math, with unknown base offset and shift amount.
-            ? peep(new AddNode(fldoff(expr,"[]"),peep(new ShlNode(null,require(parseAsgn(),"]"),fldoff(expr,"<<")))))
-            // Named field offset on an unknown struct type
-            : fldoff(expr,name)).keep();
-
-        // Disambiguate "obj.fld==x" boolean test from "obj.fld=x" field assignment
-        if( pre==0 && matchOpx('=','=') ) {
-            // Field assignment
-            Node val = parseAsgn().keep();
-            // Lift value for store
-            Node lift = fld==null ? val : new ConvertNode(fld._t,val).peephole();
-            // Memory for store, post assignment expression
-            Node mem = mem();
-            // Store to field
-            mem.keep();
-            if( expr._type instanceof TypeMemPtr view && view._ro && ctrl()._type!=Type.XCONTROL )
-                throw error("Cannot modify final field '"+name+"'");
-            Node st = new StoreNode(loc(), name, alias, decl, ctrl(), mem, expr.unkeep(), off.unkeep(), lift, false).peephole().keep();
-            storeMem(st,alias,mem);
-            st.unkeep();
-            mem.unkeep();
-
-            return val.unkeep();        // "obj.a = expr" returns the expression while updating memory
-        }
-
-        // Memory for load
-        Node mem = mem();
-        // Loading from a constant array, the declared type is the
-        // meet-over-elements and not the array itself.
-        if( name=="[]" && decl instanceof TypeConAry conary )
-            decl = conary.elem();
-
-        // Load field
-        Node load = peep(new LoadNode(loc(),name, alias, ctrl(), mem, expr, off));
-
-        // Check for assign-update, "ptr.fld += expr" or "ary[idx]++"
-        char ch = pre==0 ? _lexer.matchOperAssign() : (char)pre;
-        if( ch!=0 ) {
-            if( fld!=null && decl==Type.BOTTOM )
-                throw error( "'" + ts._name + "' is not fully initialized, field '" + fld._fname + "' needs to be set in a constructor" );
-            Node op = opAssign(ch,load, decl ).keep();
-            mem.keep();
-            if( expr._type instanceof TypeMemPtr view && view._ro && ctrl()._type!=Type.XCONTROL )
-                throw error("Cannot modify final field '"+name+"'");
-            Node st = new StoreNode(loc(), name, alias, decl, ctrl(), mem, expr.unkeep(), off.unkeep(), op, false).peephole().keep();
-            storeMem(st,alias,mem);
-            st.unkeep();
-            mem.unkeep();
-
-            op.unkeep(); // A narrow Store may have folded away the expression's conversion.
-            if( postfix(ch) ) load.unkeep();
-            return pre==0 && postfix(ch) ? load : op;
-        }
-        off.unkill();
-        // Might be a method call, so pass expr as 'self'
-        return parsePostfixMethod(load,expr.unkeep());
-    }
-
-
-    // zero/sign extend.  "i" is limited to either classic unsigned (min==0) or
-    // classic signed (min=minus-power-of-2); max=power-of-2-minus-1.
-    private Node zsMask(Node val, Type t ) {
-        if( val._type instanceof TypeFloat && t instanceof TypeInteger )
-            val = new ToIntegerNode(val).peephole();
-        if( !(val._type instanceof TypeInteger tval && t instanceof TypeInteger t0 && !tval.isa(t0)) ) {
-            if( !(val._type instanceof TypeFloat tval && t instanceof TypeFloat t0 && !tval.isa(t0)) )
-                return val;
-            // Float rounding
-            return peep(new RoundF32Node(val));
-        }
-        if( t0._min==0 )        // Unsigned
-            return peep(new AndNode(null,val,con(t0._max)));
-        // Signed extension
-        int shift = Long.numberOfLeadingZeros(t0._max)-1;
-        Node shf = con(shift);
-        if( shf._type==TypeInteger.ZERO )
-            return val;
-        return peep(new SarNode(null,peep(new ShlNode(null,val,shf.keep())),shf.unkeep()));
-    }
-
-    /**
-     * Parse a function body; the caller will parse the surrounding "{}"
-     *
-     * <pre>
-     *     { [type arg,]* -> expr }
-     *     { expr } // The no-argument function
-     * </pre>
-     */
-    private Node func() {
-        Ary<Type> ts = new Ary<>(Type.class);
-        Ary<String> ids = new Ary<>(String.class);
-        java.util.BitSet finals = new java.util.BitSet();
-        Type self = implicitSelfType();
-        ts.push(self);
-        ids.push(self == TypePtr.PTR ? "#self" : "self");
-
-        // Parse other arguments
-        _lexer.skipWhiteSpace();
-        Lexer loc = loc();      // First argument location
-        while( true ) {
-            Type t = type();    // Arg type
-            if( t==null ) break;
-            finals.set(ids.size(),bindingFinal(t));
-            String id = requireId();
-            ts .push(t );       // Push type/arg pairs
-            ids.push(id);
-            match(",");
-        }
-        require("->");
-        // Make a concrete function type, with a fidx
-        TypeFunPtr tfp = TypeFunPtr.make1((byte)2,true,ts.asAry(),Type.BOTTOM,_code.fidx(_ref._cname));
-        ReturnNode ret = parseFunctionBody(tfp,loc,finals,ids.asAry());
-        return new FunPtrNode(tfp,_code._start,ret).peephole();
-    }
-
-    private Node constructorFunc(String name) {
-        require("{");
-        Ary<Type> ts = new Ary<>(Type.class);
-        Ary<String> ids = new Ary<>(String.class);
-        java.util.BitSet finals = new java.util.BitSet();
-        TypeStruct self = _scope.constructorSelf();
-        assert self != null;
-        ts.push(TypeMemPtr.make(constructorRecv(self)));
-        ids.push("self");
-        // Explicit constructors use the same hidden allocation arguments as
-        // <init>: public memory is the call memory edge (index 1), followed by
-        // self (index 2) and the private, unescaped object memory (index 3).
-        ts.push(TypeMem.makePrivate(self));
-        ids.push("#selfMem");
-
-        _lexer.skipWhiteSpace();
-        Lexer loc = loc();
-        while( true ) {
-            Type t = type();
-            if( t==null ) break;
-            finals.set(ids.size(),bindingFinal(t));
-            String id = requireId();
-            ts .push(t );
-            ids.push(id);
-            match(",");
-        }
-        require("->");
-        TypeFunPtr tfp = TypeFunPtr.make1((byte)2,true,ts.asAry(),TypeMem.makePrivate(self),_code.fidx(_ref._cname));
-        Node[] preParse = _scope.save();
-        ReturnNode ret = _parseFunctionBody((self._name+"."+name).intern(),tfp,loc,finals,ids.asAry());
-        _scope.restore(preParse);
-        require("}");
-        return new FunPtrNode(tfp,_code._start,ret).peephole();
-    }
-
-    /**
-     *  Parse function call arguments; caller will parse the surrounding "()"
-     * <pre>
-     *   ( arg* )
-     * </pre>
-     */
-    private Node functionCall(Node fcn, Node self) {
-        Lexer site = loc();
-        site._position--; // Opening '('; arguments can contain nested calls.
-        if( fcn._type == Type.NIL )
-            throw error("Calling a null function pointer");
-        fcn.keep();            // Keep while parsing args
-
-        Ary<Node> args = new Ary<>( Node.class );
-        args.push(null);        // Space for ctrl,mem
-        args.push(null);
-        if( self != null )      // Method call has a self
-            args.push(self.keep());
-        while( !peek(')') ) {
-            Node arg = parseAsgn();
-            if( arg==null ) break;
-            args.push(arg.keep());
-            if( !match(",") ) break;
-        }
-        // Control & memory after parsing args
-        args.set(0,ctrl().keep());
-        args.set(1,mem().keep());
-        args.push(fcn);        // Function pointer
-        // Unkeep them all
-        for( Node arg : args )
-            arg.unkeep();
-        return functionCall(args,site);
-    }
-
-    private Node functionCall( Ary<Node> args ) {
-        return functionCall(args,loc());
-    }
-
-    private Node functionCall( Ary<Node> args, Lexer site ) {
-        // Dead into the call?  Skip all the node gen
-        if( ctrl()._type == Type.XCONTROL ) {
-            for( Node arg : args )
-                if( arg.isUnused() )
-                    arg.kill();
-            return con(Type.TOP);
-        }
-
-        // Into the call
-        CallNode call = (CallNode)new CallNode(site, args.asAry()).peephole();
-        // Post-call setup
-        CallEndNode cend = (CallEndNode)new CallEndNode(call,TypeRPC.constant(_code.rpc(_ref._cname))).peephole();
-        call.peephole();        // Rerun peeps after CallEnd, allows early inlining
-        cend = (CallEndNode)cend.keep().peephole(); // TODO: Might inline
-        // Control from CallEnd
-        ctrl(new CProjNode(cend,0,ScopeNode.CTRL).peephole());
-        // Memory from CallEnd
-        Node mem = new ProjNode(cend,1,ScopeNode.MEM0).peephole();
-        mem(mem);
-        // Call result
-        return new ProjNode(cend.unkeep(),2,"#2").peephole();
-    }
-
-    // Just after parsing "type foo = " can parse `"C"`
-    private boolean isExternDecl( ) {
-        int old = pos();
-        String s = parseString();
-        if( "C".equals(s) ) return true;
-        pos(old);
-        return false;
-    }
-    // External linked constant
-    private ConstantNode externDecl( String ex, Type t ) {
-        if( t instanceof TypeFunPtr tfp ) {  // Generic TFP from type parse
-            int fidx = _code.fidx(_ref._cname); // Get a FIDX
-            tfp = tfp.makeFrom(fidx);           // Become a constant
-            _code.externFunc(fidx,ex);          // Map fidx to extern name
-            t = tfp;
-        }
-        return (ExternNode)(new ExternNode(t,ex).peephole());
-    }
-
-    // A lexical C binding has a singleton namespace with one external field.
-    // The namespace occupies no storage; its field offset supplies the address.
-    private Node externData(String name, Type t) {
-        if( !(t instanceof TypeInteger) && !(t instanceof TypeFloat) )
-            throw error("C data binding requires an integer or float type");
-        String cname = ("C:"+name).intern();
-        TypeStruct ts = TypeStruct.make(cname,false,Field.make(name,t,_code.externAlias(name),false,true));
-        Type old = TYPES.putIfAbsent(cname,ts);
-        if( old!=null && old!=ts )
-            throw error("Conflicting types for C data '"+name+"'");
-        return con(TypeMemPtr.make((byte)2,ts,true));
-    }
-
-    /**
-     * Parse integer literal
-     *
-     * <pre>
-     *     integerLiteral: [1-9][0-9]* | [0]
-     *     floatLiteral: [digits].[digits]?[e [digits]]?[f]?
-     * </pre>
-     */
-    private ConstantNode parseLiteral() { return con(_lexer.parseNumber()); }
-    ConstantNode con( long con ) { return _code.con(con); }
-    ConstantNode con( Type t   ) { return _code.con(t  ); }
-    private void classInit(Lexer site, Node ptr) {
-        // Ordinary load machinery resolves the flag alias and offset when
-        // the receiver is still a forward reference.
-        Field flag = ptr._type instanceof TypeMemPtr tmp ? tmp._obj.field("$init") : null;
-        int alias = flag==null ? 1 : flag._alias;
-        Node ready = new LoadNode(site,"$init",alias,null,mem(),ptr,fldoff(ptr,"$init")).peephole();
-        CLInitNode init = new CLInitNode(site,ctrl(),mem(),ptr,ready).peephole().keep();
-        ctrl(new CProjNode(init,0,ScopeNode.CTRL).peephole());
-        Node bulk = new ProjNode(init,1,ScopeNode.MEM0).peephole().keep();
-        flag = init.flag();
-        mem(flag==null ? bulk : mergeAlias(bulk,flag._alias,
-            new ProjNode(init,2,memName(flag._alias)).peephole()));
-        bulk.unkeep();
-        init.unkeep();
-    }
-
-    // Field offset for a known type (but unknown offset)
-    public static ConFldOffNode off( TypeStruct ts, String fname ) {
-        return (ConFldOffNode)(new ConFldOffNode(ts,fname).peephole());
-    }
-    // Field offset for an unknown type
-    public Node fldoff( Node n, String name ) {
-        return new FldOffNode(n,name,loc()).peephole();
-    }
-    public Node peep( Node n ) {
-        // Peephole, then improve with lexically scoped guards
-        return _scope.upcastGuard(n.peephole());
-    }
-
-    // Parse a string or null
-    private String parseString() {
-        if( !peek('"') ) return null;
-        _lexer.inc();
-        StringBuilder sb = new StringBuilder();
-        while( !_lexer.isEOF() ) {
-            char c = _lexer.nextChar();
-            if( c=='"' ) return sb.toString();
-            if( c!='\\' ) {
-                sb.append(c);
-                continue;
-            }
-            if( _lexer.isEOF() )
-                throw error("Unclosed string");
-            sb.append(escapedChar("string"));
-        }
-        throw error("Unclosed string");
-    }
-
-    private char escapedChar(String kind) {
-        char esc = _lexer.nextChar();
-        return switch( esc ) {
-        case '0'  -> '\u0000';
-        case 'n'  -> '\n';
-        case 't'  -> '\t';
-        case 'r'  -> '\r';
-        case '\\' -> '\\';
-        case '"'  -> '"';
-        case '\'' -> '\'';
-        default -> throw error("Unknown "+kind+" escape \\\\"+esc);
-        };
-    }
-
-    // Already parsed "'"
-    private Node parseChar() {
-        if( _lexer.isEOF() ) throw error("Unclosed character");
-        char c = _lexer.nextChar();
-        if( c=='\\' ) {
-            if( _lexer.isEOF() ) throw error("Unclosed character");
-            c = escapedChar("character");
-        }
-        return require(con(TypeInteger.constant(c)),"'");
-    }
-
-    private boolean noLowerCase(String s) {
-        for( int i=0; i<s.length(); i++ )
-            if( Character.isLowerCase(s.charAt(i)) )
-                return false;
-        return true;
-    }
-
-
-    //////////////////////////////////
-    // Utilities for lexical analysis
-
-    // Return true and skip if "syntax" is next in the stream.
-    private boolean match (String syntax) { return _lexer.match (syntax); }
-    // Match must be "exact", not be followed by more id letters
-    private boolean matchx(String syntax) { return _lexer.matchx(syntax); }
-    private boolean matchOp(char c0 ) { return _lexer.matchOp(c0);  }
-    private boolean matchOpx(char c0, char c1) { return _lexer.matchOpx(c0,c1);  }
-    // Return true and do NOT skip if 'ch' is next
-    private boolean peek(char ch) { return _lexer.peek(ch); }
-    private boolean peekIsId() { return _lexer.peekIsId(); }
-
-    // ch is +/- 1, means oper++ or oper-- means postfix
-    private static boolean postfix(char ch) {
-        return (byte)ch== 1 || (byte)ch== -1;
-    }
-
-    public int pos() { return _lexer._position; }
-    private int pos(int pos) {
-        int old = _lexer._position;
-        _lexer._position = pos;
-        return old;
-    }
-    private Type posT(int pos) { _lexer._position = pos; return null; }
-    // Source code location
-    Lexer loc() { return new Lexer(_lexer); }
-
-
-    // Require and return an identifier
-    private String requireId() {
-        String id = _lexer.matchId();
-        if (id != null && !KEYWORDS.contains(id) ) return id.intern();
-        throw error("Expected an identifier, found '"+id+"'");
-    }
-
-    private String matchId() {
-        int old = pos();
-        String id = _lexer.matchId();
-        if( id==null ) return null;
-        if( !KEYWORDS.contains(id) ) return id;
-        pos(old);
-        return null;
-    }
-
-    // Require an exact match
-    private Parser require(String syntax) { require(null, syntax); return this; }
-    private <N> N require(N n, String syntax) {
-        if (match(syntax)) return n;
-        throw errorSyntax(syntax);
-    }
-
-    ////////////////////////////////////
-    // Lexer components
-
-    // Lexer provides low level access to the raw file bytes, peeks and matches
-    // short strings, parses numbers, skips comments and whitespace, tracks
-    // line numbers, allows the parse position to be saved and restored, and
-    // serves as a location indicator for errors.
-
-    public static class Lexer {
-
-        // Input buffer; an array of text bytes read from a file or a string
-        private final byte[] _input;
-        public final CompUnit _cu; // Original source, retained across inlining.
-        // Tracks current position in input buffer
-        private int _position = 0;
-
-        //
-        private int _line_number = 1;
-        // Start of current line
-        private int _line_start = 0;
-
-        /** True when this location precedes {@code that} in the same source. */
-        public boolean before(Lexer that) {
-            return that != null && (_cu!=null ? _cu==that._cu : _input==that._input) && _position < that._position;
-        }
-
-        public String position() { return _line_number+":"+(_position-_line_start+1); }
-        public int pos() { return _position; }
-
-        /**
-         * Record the source text for lexing
-         */
-        public Lexer(String source) {
-            this(source.getBytes());
-        }
-
-        /**
-         * Direct from disk file source
-         */
-        public Lexer(byte[] buf) {
-            _input = buf;
-            _cu = null;
-        }
-
-        private Lexer(CompUnit cu) {
-            _input = cu._src.getBytes();
-            _cu = cu;
-        }
-
-        // Imported location: source text is only needed when reporting an error.
-        private Lexer(CompUnit cu, int pos) {
-            _input = null;
-            _cu = cu;
-            _position = pos;
-        }
-
-
-        /**
-         *  Copy a lexer from a lexer
-         */
-        private Lexer(Lexer l) {
-            _input = l._input;
-            _cu = l._cu;
-            _position = l._position;
-            _line_number = l._line_number;
-            _line_start = l._line_start;
-        }
-
-        // Very handy in the debugger, shows the unparsed program
-        @Override
-        public String toString() {
-            return _input==null ? _cu._cname+"@"+_position : new String(_input, _position, _input.length - _position);
-        }
-
-        // True if at EOF
-        private boolean isEOF() {
-            return _position >= _input.length;
-        }
-
-        // Peek next character, or report EOF
-        private char peek() {
-            return isEOF() ? Character.MAX_VALUE   // Special value that causes parsing to terminate
-                    : (char) _input[_position];
-        }
-        // Just crash if misused
-        public byte peek(int off) { return _input[_position+off]; }
-
-        private void inc() {
-            if( _position++ < _input.length && _input[_position-1] == '\n' ) {
-                _line_number++;
-                _line_start = _position;
-            }
-        }
-        // Does not honor LF, so caller must roll back position on a LF
-        private char nextChar() {
-            char ch = peek();
-            inc();
-            return ch;
-        }
-
-        // True if a white space
-        private boolean isWhiteSpace() {
-            return peek() <= ' '; // Includes all the use space, tab, newline, CR
-        }
-
-        /**
-         * Return the next non-white-space character
-         */
-        private void skipWhiteSpace() {
-            while( true ) {
-                if( isWhiteSpace() ) inc();
-                // Skip // to end of line
-                else if( _position+2 < _input.length &&
-                         _input[_position  ] == '/' &&
-                         _input[_position+1] == '/') {
-                    inc(); inc();
-                    while( !isEOF() && _input[_position] != '\n' )
-                        inc();
-                } else if( _position+2 < _input.length &&
-                         _input[_position  ] == '/' &&
-                         _input[_position+1] == '*') {
-                    // Skip /*comment*/
-                    while( !isEOF() && !(_input[_position-1] == '*' && _input[_position] == '/'))
-                        inc();
-                    inc();
-                } else break;
-            }
-        }
-
-        // Next non-white-space character, or EOF
-        public char nextXChar() { skipWhiteSpace(); return nextChar(); }
-
-        // Return true, if we find "syntax" after skipping white space; also
-        // then advance the cursor past syntax.
-        // Return false otherwise, and do not advance the cursor.
-        boolean match(String syntax) {
-            assert syntax.indexOf('\n')==-1; // No newlines in match
-            skipWhiteSpace();
-            int len = syntax.length();
-            if (_position + len > _input.length) return false;
-            for (int i = 0; i < len; i++)
-                if ((char) _input[_position + i] != syntax.charAt(i))
-                    return false;
-            _position += len;
-            return true;
-        }
-
-        // Match must be exact and not followed by more ID characters.
-        // Prevents identifier "ifxy" from matching an "if" statement.
-        boolean matchx(String syntax) {
-            if( !match(syntax) ) return false;
-            if( !isIdLetter(peek()) ) return true;
-            _position -= syntax.length();
-            return false;
-        }
-        // Match this char, and the next char must be different.
-        // Handles '&&' vs '&'
-        boolean matchOp( char c0 ) {
-            skipWhiteSpace();
-            if( _position+1 >= _input.length || _input[_position]!=c0 || _input[_position+1]==c0 )
-                return false;
-            inc();
-            return true;
-        }
-        // Match these two characters in a row
-        boolean matchOpx(char c0, char c1) {
-            skipWhiteSpace();
-            if( _position+1 >= _input.length || _input[_position]!=c0 || _input[_position+1]==c1 )
-                return false;
-            inc();
-            return true;
-        }
-
-        private boolean peek(char ch) {
-            skipWhiteSpace();
-            return peek()==ch;
-        }
-
-        boolean peekIsId() {
-            skipWhiteSpace();
-            return isIdStart(peek());
-        }
-
-        // Return an identifier or null
-        String matchId() {
-            return peekIsId() ? parseId() : null;
-        }
-
-        // Used for errors
-        String getAnyNextToken() {
-            if (isEOF()) return "EOF";
-            if (isIdStart(peek())) return parseId();
-            if (isNumber(peek())) return parseNumberString();
-            if (isPunctuation(peek())) return parsePunctuation();
-            return String.valueOf(peek());
-        }
-
-
-        boolean isNumber(char ch) {return Character.isDigit(ch);}
-
-        // Return a constant Type, either TypeInteger or TypeFloat
-        private Type parseNumber() {
-            int old = _position;
-            int len = isLongOrDouble();
-            boolean f32 = peek()=='f';
-            if( f32 ) nextChar();
-            int n = Math.abs(len);
-            if( f32 )
-                return TypeFloat.constant(Float.parseFloat(new String(_input,old,n)));
-            if( len > 0 ) {
-                if( len > 1 && _input[old]=='0' )
-                    throw error("Syntax error: integer values cannot start with '0'",this);
-                long i = Long.parseLong(new String(_input,old,len));
-                return TypeInteger.constant(i);
-            }
-            return TypeFloat.constant(Double.parseDouble(new String(_input,old,n)));
-        }
-        private String parseNumberString() {
-            int old = _position;
-            int len = Math.abs(isLongOrDouble());
-            if( peek()=='f' ) {
-                nextChar();
-                len++;
-            }
-            return new String(_input,old,len);
-        }
-
-        // Return +len that ends a long
-        // Return -len that ends a double
-        private int isLongOrDouble() {
-            int old = _position;
-            char c;
-            while( Character.isDigit(c=nextChar()) ) ;
-            if( !(c=='e' || c=='.') )
-                return --_position - old;
-            if( peek() == '-' ) nextChar();
-            while( Character.isDigit(c=nextChar()) || c=='e' || c=='.' ) ;
-            return -(--_position - old);
-        }
-
-        // First letter of an identifier
-        private boolean isIdStart(char ch) {
-            return Character.isAlphabetic(ch) || ch == '_';
-        }
-
-        // All characters of an identifier, e.g. "_x123"
-        private boolean isIdLetter(char ch) {
-            return Character.isLetterOrDigit(ch) || ch == '_';
-        }
-
-        private String parseId() {
-            int start = _position;
-            while (isIdLetter(nextChar())) ;
-            return new String(_input, start, --_position - start).intern();
-        }
-
-        //
-        private boolean isPunctuation(char ch) {
-            return "=;[]<>()+-/*&|^".indexOf(ch) != -1;
-        }
-
-        private String parsePunctuation() {
-            int start = _position;
-            return new String(_input, start, 1);
-        }
-
-        // Next oper= character, or 0.
-        // As a convenience, mark "++" as a char 1 and "--" as char -1 (65535)
-        // Distinct tags for the multi-character compound operators.
-        static final char SHL = 2, SAR = 3, SHR = 4;
-
-        public char matchOperAssign() {
-            skipWhiteSpace();
-            if( match("<<=" ) ) return SHL;
-            if( match(">>>=") ) return SHR;
-            if( match(">>=" ) ) return SAR;
-            if( _position+2 >= _input.length ) return 0;
-            char ch0 = (char)_input[_position];
-            if( "+-/*&|^".indexOf(ch0) == -1 ) return 0;
-            char ch1 = (char)_input[_position+1];
-            if(               ch1 == '=' ) { _position += 2; return ch0; }
-            if( isIdLetter((char)_input[_position+2]) ) return 0;
-            if( ch0 == '+' && ch1 == '+' ) { _position += 2; return (char) 1; }
-            if( ch0 == '-' && ch1 == '-' ) { _position += 2; return (char)-1; }
-            return 0;
-        }
-    }
-
-    ParseException errorSyntax(String syntax) { return _errorSyntax("expected `"+syntax+"`");  }
-    private ParseException _errorSyntax(String msg) {
-        return error("Syntax error, "+msg+" but found `" + _lexer.getAnyNextToken()+"`");
-    }
-    ParseException error(String msg) { return error(msg,_lexer); }
-    public static ParseException error(String msg, Lexer loc) { return new ParseException(msg,loc); }
-
-    public static class ParseException extends RuntimeException {
-        public final Lexer _loc;
-        // file:line:charoff err
-        //String msg = "src:"+_line_number+":"+(_position-_line_start)+" "+errorMessage;
-        ParseException( String msg, Lexer loc ) { super(msg);  _loc = loc; }
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/Var.java b/chapter-modules/src/main/java/com/seaofnodes/simple/Var.java
deleted file mode 100644
index af371d21..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/Var.java
+++ /dev/null
@@ -1,54 +0,0 @@
-package com.seaofnodes.simple;
-
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-
-
-/**
- *  The tracked fields are now complex enough to deserve a array-of-structs layout
- */
-public class Var {
-
-    public final String _name;   // Declared name
-    // These fields are not final for forward reference late updates or
-    // promotions.
-    public int _idx;             // index in containing scope
-    private Type _type;          // Declared type
-    public boolean _final;       // Final field
-    public boolean _fref;        // Forward ref
-    // Parser-only definite-initialization marker.  The current binding's
-    // nullable type carries the path-sensitive state through SSA merges.
-    public boolean _uninit;
-    public int _extern;         // C storage alias; zero for ordinary variables
-    public Parser.Lexer _loc;    // Source location
-
-    public Var(int idx, String name, Type type, boolean xfinal, Parser.Lexer loc ) {
-        this(idx,name,type,xfinal,loc,false);
-    }
-    public Var(int idx, String name, Type type, boolean xfinal, Parser.Lexer loc, boolean fref) {
-        _idx = idx;
-        _name = name;
-        _type = type;
-        _final = xfinal;
-        _fref = fref;
-        _loc = loc;
-    }
-    public Type  type() { return _type; }
-    public Type _type() { return _type; } // ScopeNode printer needs to have no side effects
-
-    // Forward reference variables (not types) must be BOTTOM and
-    // distinct from inferred variables
-    public boolean isFRef() { return _fref; }
-
-    public void defFRef( Type type, boolean xfinal, Parser.Lexer loc ) {
-        assert isFRef() && xfinal;
-        _type = type;
-        _final = true;
-        _fref = false;
-        _loc = loc;
-    }
-
-    @Override public String toString() {
-        return (_fref ? "FREF " : "")+(_uninit ? "UNINIT " : "")+_type.toString()+(_final ? " ": " !")+_name;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/BuildLRG.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/BuildLRG.java
deleted file mode 100644
index 0b314978..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/BuildLRG.java
+++ /dev/null
@@ -1,101 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeMem;
-
-abstract public class BuildLRG {
-    // Compute live ranges in a single forwards pass.  Every def is a new live
-    // range except live ranges are joined at Phi.  Also, gather the
-    // intersection of register masks in each live range.  Example: "free
-    // always zero" register forces register zero, and calling conventions
-    // typically force registers.
-
-    // Sets FAILED to the set of hard-conflicts (means no need for an IFG,
-    // since it will not color, just split the conflicted ranges now).  Returns
-    // true if no hard-conflicts, although we still might not color.
-    public static boolean run(int round, RegAlloc alloc) {
-        FunNode fun = null;
-        for( Node bb : alloc._code._cfg ) {
-            if( bb instanceof FunNode fun2 )
-                fun = fun2;
-            for( Node n : bb.outs() ) {
-                // A synthetic never-exit value has no runtime definition.
-                if( n._type==Type.TOP ) continue;
-                if( n instanceof PhiNode phi && !(phi._type instanceof TypeMem) ) {
-                    if( phi instanceof MachNode mach && mach.outregmap()==null )
-                        continue;
-                    // All real Phi inputs end up with the same LRG.
-                    // Pass 1: find any pre-existing LRG, to avoid make-then-Union a LRG
-                    LRG lrg = alloc.lrg(phi);
-                    if( lrg == null )
-                        for( int i=1; i<phi.nIns(); i++ )
-                            if( (lrg = alloc.lrg(phi.in(i))) != null )
-                                break;
-                    // If none, make one.
-                    if( lrg==null ) lrg = alloc.newLRG(n,fun);
-                    if( phi instanceof MachNode ) defLRG(alloc,n,fun);
-                    // Pass 2: everybody uses the same LRG
-                    lrg=alloc.union(lrg,phi);
-                    for( int i=phi instanceof ParmNode ? 2 : 1; i<n.nIns(); i++ )
-                        // TOP keeps the type merge neutral, but needs no register.
-                        if( n.in(i)._type!=Type.TOP )
-                            lrg=alloc.union(lrg,n.in(i));
-                    if( lrg._mask!=null && lrg._mask.isEmpty() )
-                        alloc.fail(lrg);
-
-                } else if( n instanceof MachNode mach ) {
-                    // Attempt to commute ops to keep live ranges compatible.
-                    if( mach.commutes() && n.nOuts()==1 ) {
-                        int uidx = n.out(0)._inputs.find(n);
-                        RegMask mask1 = n.in (1) instanceof MachNode machx ? machx.outregmap() : alloc.lrg(n.in(1))._mask;
-                        RegMask mask2 = n.in (2) instanceof MachNode machx ? machx.outregmap() : alloc.lrg(n.in(2))._mask;
-                        RegMask masko = n.out(0) instanceof MachNode machx ? machx.regmap(uidx): mach.outregmap();
-                        if( masko!=null && !mask1.overlap(masko) && mask2.overlap(masko) )
-                            n.swap12();
-                    }
-
-                    // Define live range
-                    defLRG(alloc,n,fun);
-
-                    // Now, look in the opposite direction. How are incoming
-                    // LRGs affected by this node: For all uses, make live lrgs
-                    for( int i=1; i<n.nIns(); i++ )
-                        if( n.in(i)!=null ) {
-                            LRG lrg2 = alloc.lrg(n.in(i));
-                            if( lrg2 != null ) { // Anti-dep or other, no LRG
-                                RegMask use_mask = mach.regmap(i); // use_mask is also null for anti-dep
-                                if( use_mask!=null && !lrg2.machUse(mach,(short)i,use_mask.size1()).and(use_mask) )
-                                    alloc.fail(lrg2); // Empty register mask, must split
-                            }
-                        }
-
-                }
-
-                // MultiNodes have projections which set registers
-                if( n instanceof MultiNode && !(n instanceof CFGNode) )
-                    for( Node proj : n.outs() )
-                        if( proj instanceof MachNode )
-                            defLRG(alloc,proj,fun);
-            }
-        }
-
-        // Collect live ranges
-        alloc.unify();
-
-        return alloc.success();
-    }
-
-    private static void defLRG( RegAlloc alloc, Node n, FunNode fun ) {
-        MachNode mach = (MachNode)n;
-        RegMask def_mask = mach.outregmap();
-        if( def_mask == null ) return;
-        LRG lrg = mach.twoAddress() == 0
-            ? alloc.newLRG(n,fun)              // Define a new LRG for N
-            : alloc.lrg2(n,mach.twoAddress()); // Use the matching 2-adr input
-        // Record mask and mach
-        if( !lrg.machDef(mach,def_mask.size1()).and(def_mask) )
-            alloc.fail(lrg); // Empty register mask, must split
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ClassInitDependencies.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ClassInitDependencies.java
deleted file mode 100644
index 6c70b71d..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ClassInitDependencies.java
+++ /dev/null
@@ -1,214 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.*;
-import java.util.*;
-
-// Search for Class Initialization Cycles.
-
-// Done after Opto, so dead code does not make a cycle.
-
-// Build the inits-graph, a call-graph plus CLInits plus class parents.
-
-// (1) Scan all functions f, building _edges[f][]: the set of <cinit> fcns from
-// CompUnits from CLInitNodes, and the set of fcn call targets in f and the
-// class parent.  These are all reported as fidxs (ints).
-//
-// (2) Walk the _edges graph using Tarjans SCC. Reject cycles containing more
-// than one <clinit>.
-//
-// (3) Report on <clinit> cycles
-//
-public class ClassInitDependencies {
-    private final CodeGen _code;
-    // Function FIDX -> callees, touched initializers, and parent initializer.
-    public final int[][] _edgess;
-    private final int[] _pres;
-    private final int[] _lows;
-    private final int[] _stk ;
-    private int _sp;
-
-
-    // Build once; tests can inspect the graph independently of cycle checking.
-    public ClassInitDependencies( CodeGen code ) {
-        _code = code;
-        assert code._phase.ordinal() >= CodeGen.Phase.IterPostOpto.ordinal();
-        _pres = new int[code._linker._len];
-        _lows = new int[code._linker._len];
-        _stk  = new int[code._linker._len];
-
-        //
-        BitSet visit = code.visit();                   // Visit set per-fcn
-        Ary<CFGNode> work = new Ary<>(CFGNode.class);  // Worklist per-fcn
-        IntHashMap iset = new IntHashMap(0);           // dedup hash set per-fcn
-        _edgess = new int[code._linker._len][];
-
-        // For all functions, build the _edges array
-        for( FunNode fun : code._linker )
-            if( fun!=null && !fun.isDead() )
-                // Visit function and collect direct class touches and callees
-                _edgess[fun.sig().fidx()] = walk(code,fun,work,iset,visit,null);
-        visit.clear();
-    }
-
-    // Return the outgoing init edge set for this function
-    private static int[] walk( CodeGen code, FunNode fun, Ary<CFGNode> work, IntHashMap iset, BitSet visit,
-                              Ary<Parser.Lexer> sites) {
-        // Walk function body, looking for outgoing init edges
-        assert iset .isEmpty(); // int hash set for de-dup
-        assert visit.isEmpty(); // needs a visit set, because loops
-        assert work .isEmpty(); // needs a worklist, because DAG, parallel explore paths
-
-        // Children classes always dependent on parents
-        if( fun.isClz() && fun._compunit._par != null )
-            iset.put(code.link(fun._compunit._par).sig().fidx(),1);
-
-        work.push(fun);
-        while( !work.isEmpty() ) {
-            CFGNode cfg = work.pop();
-            if( visit.get(cfg._nid) ) continue; // Been there, done that
-            visit.set(cfg._nid);
-            assert !cfg._type.isHigh();
-            // Do not walk off end of function
-            if( cfg instanceof ReturnNode ) continue;
-
-            // CLInit adds a class init requirement to this function
-            // (plus all parent classes)
-            if( cfg instanceof CLInitNode init ) {
-                FunNode clz = code.link(init.cu()); // <clinit> referred to
-                iset.put(clz.sig().fidx(),1);       // Add to edge set
-                if( sites!=null && sites.atX(clz.sig().fidx())==null ) sites.setX(clz.sig().fidx(),init._loc);
-            }
-
-            // Calls union all their fptr fidxs into the callee set
-            if( cfg instanceof CallNode call && call.fptr()._type instanceof TypeFunPtr fp ) {
-                assert !XInt.isHigh(fp.fidxs()) && fp.nfcns()>0; // Call is alive with valid targets
-                // Union call targets into the callee set
-                for( int dstx = XInt.next(fp.fidxs(),0); dstx>=0; dstx=XInt.next(fp.fidxs(),dstx) ) {
-                    iset.put(dstx,1);
-                    if( sites!=null && sites.atX(dstx)==null ) sites.setX(dstx,call._loc);
-                }
-            }
-
-            // Forward recursion to walk the whole function
-            for( Node use : cfg._outputs ) {
-                // Do not walk into another function
-                if( !(use instanceof CFGNode cfg1) || use instanceof FunNode || use instanceof StopNode ) continue;
-                // Expect control flow edge is sensible
-                assert (use instanceof RegionNode r && r._inputs.find(cfg)>0) ||  use.in(0)==cfg;
-                if( !visit.get(cfg1._nid) ) // Small speed opt
-                    work.add(cfg1);
-            }
-        }
-
-        visit.clear();
-        int[] edges = iset.isEmpty() ? null : iset.keySet();
-        iset.clear();
-        return edges;
-    }
-
-    // Return an error string, or null if no cycle contains multiple clinits.
-    public String check() {
-        Arrays.fill(_pres,0);
-        _sp = 0;
-        _pres[0] = 1;           // Preorders stored in pres[0] and start at 1
-
-        int idx = -1;
-        for( int fidx = 1; fidx < _edgess.length; fidx++ )
-            if( _pres[fidx] == 0 &&       // Already visited
-                (idx = scc(fidx)) != -1 ) // And found a cycle
-                return report(idx);       // Report cycle
-        return null;
-    }
-
-    // Every internal edge of an SCC belongs to a cycle. Print all of them:
-    // stack order is not a path, and enumerating all cycle paths can explode.
-    // This bookkeeping and formatting are only needed on an error.
-    private String report(int idx) {
-        BitSet members = new BitSet();
-        for( int i=idx; i<_sp; i++ ) members.set(_stk[i]);
-        SB sb = new SB().p("Cyclic class initialization:");
-        // Recover one surviving source site per edge only after finding an
-        // error. A representative touch is enough; runtime first-touch order
-        // need not be statically known. Lexer snapshots retain the source CU
-        // even when the node has been inlined into a different function.
-        Ary<CFGNode> work = new Ary<>(CFGNode.class);
-        IntHashMap iset = new IntHashMap(0);
-        BitSet visit = new BitSet();
-        Ary<Parser.Lexer> sites = new Ary<>(Parser.Lexer.class);
-        for( int i=idx; i<_sp; i++ ) {
-            int src = _stk[i];
-            FunNode fun = _code.link(src);
-            Arrays.fill(sites._es,null);
-            sites.clear();
-            walk(_code,fun,work,iset,visit,sites);
-            if( _edgess[src]!=null )
-                for( int dst : _edgess[src] )
-                    if( members.get(dst) ) {
-                        sb.p("\n  ").p(name(src)).p(" -> ").p(name(dst));
-                        Parser.Lexer loc = sites.atX(dst);
-                        if( loc!=null && loc._cu!=null )
-                            sb.p('\n').p(SourceError.format(loc._cu,loc.pos(),"cyclic class initialization"));
-                        else if( fun.isClz() && fun._compunit._par==_code.link(dst)._compunit )
-                            sb.p("\n    parent initialization requirement");
-                    }
-        }
-        return sb.toString();
-    }
-
-    private String name(int fidx) {
-        FunNode fun = _code.link(fidx);
-        String owner=fun._compunit._cname;
-        if( fun.isClz() ) return owner;
-        String label=fun.label();
-        return (label.startsWith(owner+".") ? label : owner+"."+label)+" [fidx "+fidx+"]";
-    }
-
-    // Tarjan SCC
-    int scc( int fidx ) {
-        // Assign pre-order number
-        _lows[fidx] = _pres[fidx] = _pres[0]++;
-        _stk[_sp++] = fidx;
-        // walk outbound edges
-        if( _edgess[fidx]!=null ) {
-            for( int edge : _edgess[fidx] ) {
-                if( edge >= _pres.length ) continue; // Out of bounds happens when calling C fcns
-                if( _pres[edge] == 0 ) { // Not visited
-                    int idx = scc(edge);
-                    if( idx != -1 ) return idx; // Found a cycle
-                    _lows[fidx] = Math.min(_lows[fidx],_lows[edge]);
-                } else if( _edgess[edge]!=null && onStk(edge) ) {
-                    _lows[fidx] = Math.min(_lows[fidx],_pres[edge]);
-                }
-            }
-        }
-        // Found a cycle
-        if( _lows[fidx] == _pres[fidx] ) {
-            int idx = find(fidx);
-            if( hasClzCycle(idx) )
-                return idx;     // Found a class cycle
-            // Pop stack, including fidx
-            _sp = idx;
-        }
-        return -1;              // No cycle
-    }
-
-    private int find(int e) {
-        for( int i=0; i<_sp; i++ )  if( _stk[i] == e ) return i;
-        return -1;
-    }
-    private boolean onStk(int e) { return find(e) != -1; }
-
-    private boolean hasClzCycle(int idx) {
-        int clinits = 0;
-        for( int i=idx; i<_sp; i++ ) {
-            FunNode fun = _code.link(_stk[i]);
-            if( fun!=null && fun.isClz() && ++clinits > 1 )
-                return true;
-        }
-        return false;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Coalesce.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Coalesce.java
deleted file mode 100644
index 689ceceb..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Coalesce.java
+++ /dev/null
@@ -1,105 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.Utils;
-import java.util.BitSet;
-import java.util.IdentityHashMap;
-
-// Coalesce copies
-abstract public class Coalesce {
-
-    public static boolean coalesce( int round, RegAlloc alloc ) {
-
-        // Walk all the splits, looking for coalesce chances
-        boolean progress = false;
-        for( CFGNode bb : alloc._code._cfg ) {
-            outer:
-            for( int j=0; j<bb.nOuts(); j++ ) {
-                Node n = bb.out(j);
-                if( !(n instanceof SplitNode) ) continue;
-                LRG v1 = alloc.lrg(n);
-                LRG v2 = alloc.lrg(n.in(1));
-                if( v1 != v2 ) {
-                    LRG ov1 = v1, ov2 = v2;
-                    // Get the smaller neighbor count in v1
-                    if( v1.nadj() > v2.nadj() )
-                        { v1 = v2; v2 = alloc.lrg(n); }
-                    int v2len = v2._adj==null ? 0 : v2._adj._len;
-                    // See that they do not conflict (coalescing would make a self-conflict)
-                    if( v1._adj!=null && v2._adj!=null && v1._mask.overlap(v2._mask) ) {
-                        // Walk the smaller neighbors, and add to the larger.
-                        // Check for direct conflicts along the way.
-                        for( LRG v3 : v1._adj ) {
-                            if( v3==v2 ) {
-                                // Direct conflict, skip this LRG pair
-                                v2._adj.setLen(v2len);
-                                continue outer;
-                            }
-                            // Add missing LRGs from V1 to V2
-                            if( v2._adj.find(v3)== -1 )
-                                v2._adj.push(v3);
-                        }
-                    }
-                    // Most constrained mask
-                    RegMask mask = v1._mask==v2._mask ? v1._mask : v1._mask.copy().and(v2._mask);
-                    // Check for capacity
-                    if( v2.nadj() >= mask.size() ) {
-                        // Fails capacity, will not be trivial colorable
-                        if( v2._adj!=null ) v2._adj.setLen(v2len);
-                        continue;
-                    }
-
-                    // Union lrgs.
-                    progress = true;
-
-                    // Since `n` is dying, remove from the LRGS BEFORE doing
-                    // the union; this will let the union code keep the
-                    // matching bits from the other side, preserving some
-                    // info for biased coloring
-                    if( ov1. _machDef==n ) ov1. _machDef = null;
-                    if( ov1._splitDef==n ) ov1._splitDef = null;
-                    if( ov2. _machUse==n ) ov2. _machUse = null;
-                    if( ov2._splitUse==n ) ov2._splitUse = null;
-                    // Keep larger adjacency list.
-                    Ary<LRG> larger = v2._adj;
-                    v2._adj = null;
-
-                    // Union lrgs.  Swaps again, based on small lrg
-                    LRG vWin = v1.union(v2);
-                    vWin._adj = larger;
-                    LRG vLose = v1.leader() ? v2 : v1;
-
-                    // LRGs below v2len were always in v2, but maybe not in v1.
-                    // LRGs above v2len are in v1 but were not in v2.
-
-                    // Walk v2's neighbors, replacing vLose with vWin.
-                    if( larger != null )
-                        for( LRG vn : larger ) {
-                            int idx = vn._adj.find(vLose);
-                            if( idx != -1 )
-                                vn._adj.del(idx);
-                            if( vn._adj.find(vWin) == -1 )
-                                vn._adj.add(vWin);
-                        }
-                } else {
-
-                    // Since `n` is dying, remove from the LRGS
-                    if( v1. _machDef==n ) v1. _machDef=null;
-                    if( v1. _machUse==n ) v1. _machUse=null;
-                    if( v1._splitDef==n ) v1._splitDef=null;
-                    if( v1._splitUse==n ) v1._splitUse=null;
-                }
-
-                // Remove junk split
-                n.removeSplit();
-                j--;
-            }
-        }
-
-        if( progress )
-            alloc.unify();
-
-        return true;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java
deleted file mode 100644
index e6bace8c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java
+++ /dev/null
@@ -1,625 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.graph.GraphObserver;
-import com.seaofnodes.simple.IterPeeps;
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.print.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.*;
-import java.io.File;
-import java.util.*;
-
-
-// Compile Driver for a Compilation Unit
-@SuppressWarnings("unchecked")
-public class CodeGen {
-
-    // Last created CodeGen as a global; used all over to avoid passing about a "context".
-    public static CodeGen CODE;
-
-    // Location of built-in CPU ports
-    public static final String PORTS = "com.seaofnodes.simple.node.cpus";
-
-    // Compile phases
-    public enum Phase {
-        Parse,                  // Parse ASCII text into Sea-of-Nodes IR
-        Iter,                   // Pessimistic peepholes after parse
-        Opto,                   // SCCP, numeric modes, seed the peephole worklist
-        IterPostOpto,           // Peepholes and inlining using SCCP results
-        FinalizeIR,             // Field layout, offset cleanup, function/CU roots
-        TypeCheck,              // Last check for bad programs
-        Lower,                  // Expand checked class initialization to ordinary IR
-        LoopTree,               // Build a loop tree; break infinite loops
-        Select,                 // Convert to target hardware nodes
-        Schedule,               // Global schedule (code motion) nodes
-        LocalSched,             // Local schedule
-        RegAlloc,               // Register allocation
-        Encoding,               // Encoding
-        Export,                 // Export
-        LastPhase               // After last phase
-    }
-    public Phase _phase;
-    // Null for normal compilation; owned by this compilation, not a global viewer.
-    public GraphObserver<Node> _obs;
-
-    /** True when tests deliberately randomize Iter worklist order. */
-    public static boolean iterSeedOverridden() { return System.getProperty("simple.iter.seed") != null; }
-
-    // Expensive assert sampling:
-    //   -Dsimple.assert.expensive=0 disables these checks
-    //   -Dsimple.assert.expensive=1 checks every step
-    //   -Dsimple.assert.expensive=N checks once every 1<<N steps
-    private static final int EXPENSIVE_ASSERT_LOG = Integer.getInteger("simple.assert.expensive",8);
-    public static boolean expensiveAssert() { return EXPENSIVE_ASSERT_LOG > 0; }
-    public static boolean expensiveAssert( int trip ) {
-        if( EXPENSIVE_ASSERT_LOG <= 0 ) return false;
-        if( EXPENSIVE_ASSERT_LOG == 1 ) return true;
-        int shift = Math.min(EXPENSIVE_ASSERT_LOG,30);
-        return (trip & ((1<<shift)-1)) == 0;
-    }
-
-    // ---------------------------
-    // Module Source Root
-    public final String _modDir;
-    // Module Build Root
-    public final String _buildDir;
-    // Slashed path from source root to the entry file, without ".smp".
-    public final String _srcName;
-
-    // Only available for tests, otherwise source comes from the CompUnit
-    private final String _src;
-
-    // Current Working Directory; default module base
-    private final String _cwd;
-
-    // Source files discovered in this invocation. All live initializers
-    // participate in cycle checking, including fully inlined bodies.
-    public HashMap<String,CompUnit> _compunits;
-
-    // Test shortcut for only one compilation unit
-    public CompUnit compunit() {
-        assert _compunits.size()==1;
-        for( CompUnit cu : _compunits.values() )
-            return cu;
-        assert false : "no compilation unit";
-        return null;
-    }
-
-    // True when fidx is published through a public class or instance field.
-    public boolean publicFIDX(int fidx) {
-        if( fidx < LocalIds.RESERVED ) return false;
-        // A public class initializer is itself an external root; unlike
-        // constructors and methods, it is not reached through a class field.
-        FunNode fun = _linker.atX(fidx);
-        if( fun != null && fun.isClz() && fun.isPublic() )
-            return true;
-        // Include instance methods even while their constant function fields
-        // are stored in each instance rather than on the class object.
-        for( Type t : Parser.TYPES.values() )
-            if( t instanceof TypeStruct clz &&
-                Parser.startsClzPrefix(clz._name) &&
-                Parser.isPublicClassName(clz._name) &&
-                resolvedClass(clz) ) {
-                if( publicFieldFIDX(clz,fidx) ) return true;
-                Type self = Parser.TYPES.get(clz._name.substring(Parser.CLZ.length()));
-                if( self instanceof TypeStruct ts && publicFieldFIDX(ts,fidx) ) return true;
-            }
-        return false;
-    }
-
-    private static boolean publicFieldFIDX(TypeStruct clz, int fidx) {
-        boolean hasCtor = clz.field("<ctor>") != null;
-        for( Field fld : clz._fields )
-            if( fld._fname.charAt(0)!='_' && fld._t instanceof TypeFunPtr tfp &&
-                // With a user constructor, class:N.N is the private <init>.
-                !(hasCtor && clz.hiddenInit(fld)) &&
-                XInt.bit(tfp._fidxs,fidx) )
-                return true;
-        return false;
-    }
-
-    public static boolean hasUserConstructor(TypeStruct self) {
-        Type t = Parser.TYPES.get(Parser.addClzPrefix(self._name));
-        return t instanceof TypeStruct clz && clz.field("<ctor>") != null;
-    }
-
-    // A forward reference gets a class object and constructor signature so
-    // parsing can proceed, but it has no callable definition yet.
-    private static boolean resolvedClass(TypeStruct clz) {
-        Type t = Parser.TYPES.get(clz._name.substring(Parser.CLZ.length()));
-        return !(t instanceof TypeStruct ts) || !ts._fref;
-    }
-
-    private int[] _publicFIDXs, _publicAliases;
-
-    /**
-     * Freeze the externally visible portion of the program after ParseAll has
-     * loaded every compilation unit and closed/upgraded all types.  Later
-     * optimization can remove linker entries and create inline-only fidxs;
-     * neither operation changes this interface.
-     */
-    void freezePublicInterface() {
-        assert _publicFIDXs==null && _publicAliases==null;
-        int[] fidxs = XInt.EMPTY;
-        for( int fidx=LocalIds.RESERVED; fidx<_linker._len; fidx++ )
-            if( publicFIDX(fidx) )
-                fidxs = XInt.make(fidxs,fidx);
-        int[] aliases = XInt.EMPTY;
-        for( Type t : Parser.TYPES.values() )
-            if( t instanceof TypeStruct clz &&
-                Parser.startsClzPrefix(clz._name) &&
-                Parser.isPublicClassName(clz._name) &&
-                resolvedClass(clz) ) {
-                boolean hasCtor = clz.field("<ctor>") != null;
-                for( Field fld : clz._fields )
-                    if( fld._fname.charAt(0)!='_' && fld._t!=Type.TOP &&
-                        !(hasCtor && clz.hiddenInit(fld)) )
-                        aliases = XInt.make(aliases,fld._alias);
-            }
-        _publicFIDXs = fidxs;
-        _publicAliases = aliases;
-    }
-
-    public int[] publicFIDXs()  { assert _publicFIDXs !=null; return _publicFIDXs;  }
-    public int[] publicAliases(){ assert _publicAliases!=null; return _publicAliases; }
-    public boolean publicInterfaceFrozen() { return _publicFIDXs != null; }
-
-    // ---------------------------
-
-    // Very common nodes, cached here
-    public final ConstantNode ZERO;
-    public final XCtrlNode XCTRL;
-
-    public Node constant( Type t ) {
-        assert _phase==null || _phase.ordinal() <= Phase.Lower.ordinal();
-        return ConstantNode.make(t).peephole();
-    }
-    public ConstantNode con( Type t ) { return (ConstantNode)constant(t); }
-    public ConstantNode con( long con ) { return con==0 ? ZERO : con(TypeInteger.constant(con));  }
-
-
-    // ---------------------------
-    // Test setup; no module nor file with specific argument
-    public CodeGen( String src ) { this(src, 126L, true ); }
-
-    // Test setup; no module nor file; can alter seed & argument; can re-run same CodeGen
-    public CodeGen( String src, Type arg ) {
-        this(null,null,null, src, 126L, true, arg);
-    }
-    // Test setup; no module nor file; can alter seed & argument; can re-run same CodeGen
-    public CodeGen( String src, long workListSeed, boolean resetTypes ) {
-        this(null,null,null, src, workListSeed, resetTypes, TypeInteger.BOT);
-    }
-
-    // Generic CodeGen, including full module setup
-    public CodeGen( String modDir, String buildDir,
-                    String srcName, String src, long workListSeed, boolean resetTypes, Type arg ) {
-        // Public singleton to avoid passing about this state to a huge count
-        // of places.  Probably becomes a TLS at some point.
-        CODE = this;
-        if( resetTypes ) Type.reset();           // Reset to recover from failed test
-
-        _cwd = System.getProperty("user.dir")+"/";
-        _modDir   =   modDir == null ? _cwd :   modDir;
-        _buildDir = buildDir == null ? _cwd : buildDir;
-        _srcName = srcName;
-        _callingConv = null;       // Calling convention
-        // Source code from test strings, not files
-        _src = src;
-        // All the compilation units
-        _compunits = new HashMap<>();
-        _phase = null;
-        // Start GVN table
-        _gvn = new HashMap<>();
-        // Allow whole-suite worklist-order sweeps without rewriting the many
-        // explicit seeds used by tests and command-line compilation.
-        String iterSeed = System.getProperty("simple.iter.seed");
-        _iter = new IterPeeps(iterSeed == null ? workListSeed : Long.parseLong(iterSeed));
-        // End points of graph
-        _stop = new StopNode().init();
-        _start = new StartNode(null,_stop,arg).init();
-        ZERO  = con(TypeInteger.ZERO).keep();
-        XCTRL = new XCtrlNode().peephole().keep();
-        P = new Parser(this);
-    }
-
-
-    // Run the requested phases. ELF output contains machine code and data.
-
-    // No code emission, just IR generation
-    public CodeGen driver( Phase phase ) { return driver(phase,null,null,false,false,0); }
-    // No object file writing, but code generation for a specific cpu/os pair (allows emulation)
-    public CodeGen driver( Phase phase, String cpu, String callingConv ) {
-        if( phase.ordinal() < Phase.Export.ordinal() )
-            // No code outputted
-            return driver(phase,cpu,callingConv,false,false,0);
-        if( _srcName == null )
-            throw new RuntimeException("No source filename provided, so do not know how to name the obj file");
-        boolean emitEntrySymbol = !_srcName.contains(".");
-        return driver( phase, cpu, callingConv, false, emitEntrySymbol, 0 );
-    }
-    // Write an object file for a specific cpu/os pair
-
-    public CodeGen driver( String cpu, String callingConv, boolean inMemory, boolean emitEntrySymbol ) { return driver(Phase.Export,cpu,callingConv,inMemory,emitEntrySymbol,0); }
-
-    // The Generic driver
-    public CodeGen driver( Phase target, String cpu, String callingConv, boolean inMemory, boolean emitEntrySymbol, int dump ) {
-        // Parse the entry source and discover all referenced source files.
-        step(target, Phase.Parse,        this::parse,        dump);
-        // Run peepholes to a fixed point
-        step(target, Phase.Iter,         this::iter,         dump);
-        // Run SCCP (and resolve int/flt expressions)
-        step(target, Phase.Opto,         this::opto,         dump);
-        // Run peepholes to a fixed point again, on the better types.
-        step(target, Phase.IterPostOpto, this::iterPostOpto, dump);
-        // Field layouts; field symbols become constant offsets
-        step(target, Phase.FinalizeIR,   this::finalizeIR,   dump);
-        // Final error check - bad programs fail here
-        step(target, Phase.TypeCheck,    this::typeCheck,    dump);
-        // Replace "fat" nodes with their exploded explicit IR; this can
-        // introduce CFG diamonds
-        step(target, Phase.Lower,        this::lower,        dump);
-        // Compute the loop-tree, used for approximating exec frequencies for
-        // scheduling and register allocation
-        step(target, Phase.LoopTree,     this::loopTree,     dump);
-        // Instruction selection
-        step(target, Phase.Select, () -> instSelect(cpu,callingConv), dump);
-        // Global Code Motion
-        step(target, Phase.Schedule,     this::GCM,          dump);
-        // Local (basic block only) scheduling
-        step(target, Phase.LocalSched,   this::localSched,   dump);
-        // Register allocation
-        step(target, Phase.RegAlloc,     this::regAlloc,     dump);
-        // Encode machine instructions into bits
-        step(target, Phase.Encoding,     this::encode,       dump);
-        // Export machine code and data into one ELF file
-        step(target, Phase.Export, () -> exportELF(inMemory,emitEntrySymbol), dump);
-        return this;
-    }
-
-    // The driver names the order; optional phases decide locally whether to run.
-    private void step(Phase target, Phase next, Runnable work, int dump) {
-        if( next.ordinal() > target.ordinal() || (_phase!=null && _phase.ordinal()>=next.ordinal()) ) return;
-        Phase prior = _phase;
-        work.run();
-        if( _phase!=prior ) dump(dump);
-    }
-
-    // All phase entry points share ordering checks, timing, and viewer notification.
-    // Record elapsed time even on failure, but report completion only on success.
-    CodeGen phase(Phase next, boolean ordered, Runnable work) {
-        assert ordered : "Cannot run "+next+" after "+_phase;
-        _phase = next;
-        long t0 = System.currentTimeMillis();
-        work.run();             // Do The Phase
-        _times[next.ordinal()] = System.currentTimeMillis() - t0;
-        if( _obs!=null ) _obs.phase(next.name()); // Record for viewer
-        return this;
-    }
-
-    public String entryClinitName() {
-        return Parser.addClzPrefix(_srcName==null ? "Test" : _srcName.replace('/','.'))+".<clinit>";
-    }
-
-    // Verbose printing during compilation
-    private void dump(int dump) {
-        int p2 = _phase.ordinal();
-        if( (dump & (1<<p2)) == 0 ) return;
-        if( (dump & (1<<30)) != 0 )
-            System.err.println("After "+_phase+":");
-        System.err.println(_phase.ordinal() >= Phase.LocalSched.ordinal()
-                           ? asm(new SB()).toString()
-                           : IRPrinter.prettyPrint(this));
-    }
-
-
-    // Record times by phase
-    public final long[] _times = new long[Phase.LastPhase.ordinal()];
-
-    // ---------------------------
-    /**
-     *  A counter, for unique node id generation.  Starting with value 1, to
-     *  avoid bugs confusing node ID 0 with uninitialized values.
-     */
-    public int _uid = 1;
-    public int UID() { return _uid; }
-    public int getUID() {
-        return _uid++;
-    }
-
-
-    // Allocate dense alias/function/call IDs within this invocation.
-    // Class slots let a forward reference reserve an initializer's identity.
-    public final LocalIds _aliases = new LocalIds();
-    public int alias(String clz) { return _aliases.next(clz); }
-
-    // C storage has one global alias per symbol, including across object files.
-    public int externAlias(String name) { return _aliases.next("C:"+name,LocalIds.RESERVED); }
-
-    // External data addresses supplied by an in-memory linker (image offsets).
-    public final HashMap<String,Integer> _externDataAddresses = new HashMap<>();
-
-    // Compute local function index (FIDX) from global function info.  This is
-    // called *in order* during parsing, and that order is part of the global
-    // unique mapping
-    public final LocalIds _fidxs = new LocalIds();
-    // Return local index for specific global file & order.  Used to find fidxs for e.g. FREF class <init> fcns
-    public int fidx( String clz, int order ) { return _fidxs.next(clz, order); }
-    // New fidx in the current file
-    public int fidx( String clz ) { return fidx(clz, -1); }
-
-    // Compute local RPC index from global RPC info, one per call
-    public final LocalIds _rpcs = new LocalIds();
-    public int rpc( String clz ) { return _rpcs.next(clz); }
-
-
-    // Inlining can insert CFG edges and invalidate cached depth ordering.
-    private char _iDepthVersion;
-    public char iDepthVersion() { return _iDepthVersion; }
-    public void invalidateIDepthCaches() {
-        assert _iDepthVersion < Character.MAX_VALUE : "Dominator cache version exceeds 65535";
-        ++_iDepthVersion;
-    }
-
-    // Popular visit bitset, declared here, so it gets reused all over
-    public final BitSet _visit = new BitSet();
-    public BitSet visit() { assert _visit.isEmpty(); return _visit; }
-
-    // Start and Stop; end points of the generated IR
-    public StartNode _start;
-    public StopNode  _stop;
-
-    // Global Value Numbering.  Hash over opcode and inputs; hits in this table
-    // are structurally equal.
-    public final HashMap<Node,Node> _gvn;
-
-    // Reverse from a constant function pointer to the IR function being called.
-    // Error to call with a non-constant TFP
-    public FunNode link( TypeFunPtr tfp ) { return link(tfp.fidx());  }
-    // Read-only linker lookup, suitable for printers and debugger display.
-    // In particular, do not lazily remove a partially dead function.
-    public FunNode _link(int fidx) { return _linker.atX(fidx); }
-    public FunNode _link(TypeFunPtr tfp) { return _link(tfp.fidx()); }
-    // Return the FunNode from a fidx
-    public FunNode link( int fidx ) {
-        FunNode fun =_linker.atX(fidx);
-        if( fun!=null && fun.isDead() ) {
-            _linker.setX(fidx,null); fun = null; }
-        return fun;
-    }
-    // Return the <clinit> for a CompUnit
-    public FunNode link( CompUnit cu ) {
-        for( FunNode fun : _linker )
-            if( fun!=null && fun._compunit == cu && fun.isClz() )
-                return fun;
-        return null;
-    }
-
-    // Insert linker mapping from constant function signature to the function
-    // being called.
-    public void link(FunNode fun) {
-        int fidx = fun.sig().fidx();
-        _linker.setX(fidx,fun);
-    }
-
-    // "Linker" mapping from constant TypeFunPtrs to heads of function.  These
-    // TFPs all have exact single fidxs and their return is wiped to BOTTOM (so
-    // the return is not part of the match).
-    public final Ary<FunNode> _linker = new Ary<>(FunNode.class);
-    public final Ary<CallNode> _calls = new Ary<>(CallNode.class);
-
-    // Extern function declarations; input is the FIDX assigned to the name.
-    final HashMap<Integer,String> _externFunc = new HashMap<>();
-    public void externFunc(int fidx, String ex) {
-        assert !_externFunc.containsKey(fidx);
-        _externFunc.put(fidx,ex);
-    }
-    public String externFunc(int fidx) { return _externFunc.get(fidx); }
-
-    public String funcName(int fidx ) {
-        FunNode fun = _link(fidx);
-        if( fun!=null ) return fun._name;
-        return externFunc(fidx);
-    }
-
-    public boolean owns(FunNode fun) {
-        return fun._compunit != null && fun._compunit._src != null;
-    }
-
-
-    // ---------------------------
-    // Parser object
-    public final Parser P;
-
-    // Parse ASCII text into Sea-of-Nodes IR
-    public CodeGen parse() { return phase(Phase.Parse, _phase==null, () -> ParseAll.parse(this,_src)); }
-
-
-    // ---------------------------
-    // Iterator peepholes.
-    public final IterPeeps _iter;
-    // Stop tracking deps while assertin
-    public boolean _midAssert;
-    // Statistics on peepholes
-    public int _iter_cnt, _iter_nop_cnt;
-    // Stat gathering
-    public void iterCnt() { if( !_midAssert ) _iter_cnt++; }
-    public void iterNop() { if( !_midAssert ) _iter_nop_cnt++; }
-
-    // Pessimistic peepholes after parsing.  This lifts loaded and parsed
-    // types before the optimistic Opto pass resets types and lets them fall.
-    public CodeGen iter() { return phase(Phase.Iter, _phase==Phase.Parse, () -> Iter.run(this)); }
-
-    // SCCP and numeric-mode resolution; leave cleanup work queued for Iter.
-    public CodeGen opto() { return phase(Phase.Opto, _phase==Phase.Iter, () -> Opto.opto(this)); }
-
-    public CodeGen iterPostOpto() { return phase(Phase.IterPostOpto, _phase==Phase.Opto, () -> _iter.iterate(this)); }
-
-    public CodeGen finalizeIR() { return phase(Phase.FinalizeIR, _phase==Phase.IterPostOpto, () -> FinalizeIR.run(this)); }
-
-    // Root a surviving function without claiming that it has unknown callers.
-    void keepInCompUnit(FunNode fun) {
-        StopCUNode stop = fun._compunit._stop;
-        if( stop._inputs.find(fun.ret()) == -1 )
-            add(stop).addDef(fun.ret());
-    }
-    public <N extends Node> N add( N n ) { return _iter.add(n); }
-    public void addAll( Ary<Node> ary ) { _iter.addAll(ary); }
-    public void addAll( Node n ) { _iter.add(n); _iter.addAll(n._inputs); }
-
-    // ---------------------------
-    // Last check for bad programs
-    public CodeGen typeCheck() { return phase(Phase.TypeCheck, _phase==Phase.FinalizeIR, () -> TypeCheck.run(this)); }
-
-    public static TypeStruct requiredStruct(Node n) {
-        // CNC: remove? cleanup?
-        if( n instanceof NewNode alloc )  return alloc._ts;
-        if( n instanceof ConFldOffNode off ) return off._ts;
-        if( n instanceof FldOffNode off && off.in(0)._type instanceof TypeMemPtr ptr ) return ptr._obj;
-        return null;
-    }
-
-    // ---------------------------
-    // TypeCheck queued surviving CLInits during its existing error walk.
-    public CodeGen lower() {
-        return phase(Phase.Lower, _phase==Phase.TypeCheck, () -> _iter.iterate(this));
-    }
-
-    // ---------------------------
-    // Build the loop tree; break never-exit loops
-    public CodeGen loopTree() {
-        return phase(Phase.LoopTree, _phase==Phase.Lower, () -> { _start.buildLoopTree(_linker,_stop); FinishCalls.run(this); });
-    }
-
-    // ---------------------------
-
-
-    // ---------------------------
-    // Code generation CPU target
-    public Machine _mach;
-    // Chosen calling convention (usually either Win64 or SystemV)
-    public String _callingConv;
-    public String _cCallingConv;
-    // Callee save registers
-    public RegMask _callerSave;
-    public RegMask _cCallerSave;
-
-    // All returns have the following inputs:
-    // 0 - ctrl
-    // 1 - memory
-    // 2 - varies with returning GPR,FPR
-    // 3 - RPC
-    // 4+- Caller save registers
-    public RegMask[] _retMasks;
-    // Return Program Counter
-    public RegMask _rpcMask;
-
-    // Convert to target hardware nodes
-    public CodeGen instSelect( String cpu, String callingConv ) { return instSelect(cpu,callingConv,PORTS); }
-    public CodeGen instSelect( String cpu, String callingConv, String base ) {
-        return InstSelect.select(this,cpu,callingConv,base);
-    }
-
-    // ---------------------------
-
-
-    // ---------------------------
-    // Control Flow Graph in Reverse Post Order.
-    public Ary<CFGNode> _cfg = new Ary<>(CFGNode.class);
-
-    // Global schedule (code motion) nodes
-    public CodeGen GCM() {
-        return phase(Phase.Schedule, (_phase==Phase.LoopTree || _phase==Phase.Select), () -> GlobalCodeMotion.buildCFG(this));
-    }
-
-    // ---------------------------
-    // Local (basic block) scheduler phase, a classic list scheduler
-    public CodeGen localSched() { return phase(Phase.LocalSched, _phase==Phase.Schedule, () -> ListScheduler.sched(this)); }
-
-
-    // ---------------------------
-    // Register Allocation
-    public RegAlloc _regAlloc;
-    public CodeGen regAlloc() {
-        return phase(Phase.RegAlloc, _phase==Phase.LocalSched, () -> {
-            _regAlloc = new RegAlloc(this);
-            _regAlloc.regAlloc();
-        });
-    }
-
-    // Human-readable register name
-    public String reg(Node n) {
-        if( _phase.ordinal() >= Phase.RegAlloc.ordinal() ) {
-            String s = _regAlloc.reg(n);
-            if( s!=null ) return s;
-        }
-        return "N"+ n._nid;
-    }
-
-
-    // ---------------------------
-    // Encoding
-    public Encoding _encoding;
-    public CodeGen encode() { return phase(Phase.Encoding, _phase==Phase.RegAlloc, () -> _encoding = new Encoding(this).encode()); }
-
-    // ---------------------------
-    // Exporting to external formats
-    ElfWriter _elf;
-    public CodeGen exportELF( boolean inMemory, boolean emitEntrySymbol ) {
-        return phase(Phase.Export, _phase==Phase.Encoding, () -> {
-            if( inMemory ) new LinkMem(this).link(_encoding);
-            else           _elf = new ElfWriter(this).export(emitEntrySymbol);
-        });
-    }
-
-
-    // ---------------------------
-
-    public boolean _asmLittle=true;
-    public String asm() { return asm(new SB()).toString(); }
-    SB asm(SB sb) {
-        ASMPrinter.print(sb,this);
-        return sb;
-    }
-
-
-    // Testing shortcuts
-    public Node ctrl() { return compunit()._stop.ret().ctrl(); }
-    public Node expr() { return compunit()._stop.ret().expr(); }
-    public String print() { return compunit()._stop.print(); }
-
-    // Debugging helper
-    @Override public String toString() {
-        if( _stop == null )
-            return "No StopNode";
-        return IRPrinter.prettyPrint(this);
-    }
-
-    // Debugging helper
-    public Node f(int idx) {
-        for( CompUnit cu : _compunits.values() ) {
-            Node n = (cu._stop == null ? _stop : cu._stop).find(idx);
-            if( n != null ) return n;
-        }
-        return null;
-    }
-
-
-    String printCFG() {
-        if( _cfg==null ) return "no CFG";
-        SB sb = new SB();
-        for( CFGNode cfg : _cfg ) {
-            sb.fix(8,""+(int)cfg._idepth);
-            IRPrinter.printLine( cfg, sb );
-        }
-        return sb.toString();
-    }
-
-    public static void print_as_hex(Encoding enc) {
-        for (byte b : enc._bits.toByteArray()) {
-            System.out.print(String.format("%02X", b));
-        }
-        System.out.println();
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/CompUnit.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/CompUnit.java
deleted file mode 100644
index c8b0a82c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/CompUnit.java
+++ /dev/null
@@ -1,98 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeStruct;
-import com.seaofnodes.simple.util.*;
-import java.io.File;
-import java.io.IOException;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.util.*;
-import static com.seaofnodes.simple.codegen.CodeGen.CODE;
-
-// A source file and its class. Parent links follow the source directory tree.
-public class CompUnit {
-    public final CompUnit _par; // Parent, e.g. A/B
-    final String _fname;        // Full slashed file name starting from module root, e.g. A/B/C
-    final public String _cname; // Full dotted class name starting from module root, e.g. A.B.C
-    final String _name;         // Base name, e.g. C
-    final File _smp;            // Simple source file, e.g. module_root/A/B/C.smp
-    final public String _src;   // Source code, from file or test case
-
-    public String sourceFile() {
-        return _smp!=null ? _smp.getAbsolutePath() : null;
-    }
-
-    public TypeStruct _clz; // The one TypeStruct being published
-
-    // _deps records units required for types, code, or class references,
-    // without requiring their initializers to run. These source
-    // dependencies may form a cycle.
-    Ary<CompUnit> _deps;
-
-    // Per-Compilation-Unit Start/StopNodes, keeping alive all exported Nodes.
-    // Null means no code loaded (yet).
-    public StartCUNode _start;
-    public StopCUNode  _stop ;
-
-
-    // Discovered source file.  Source is loaded if required to parse, and null
-    // otherwise.
-    CompUnit( CompUnit par, String fname, String cname, String name ) throws IOException {
-        _par  = par;
-        _fname= fname;
-        _cname= cname;
-        _name = name;
-        _smp  = source(fname);
-
-        _src = _smp.exists() ? Files.readString(_smp.toPath()) : null;
-    }
-
-    // The bundled library is ordinary source. A local sys tree can replace it;
-    // this chapter never loads Simple code from an object file.
-    static File source(String fname) {
-        File file=new File(CODE._modDir,fname+".smp");
-        if( file.exists() || !(fname.equals("sys") || fname.startsWith("sys/")) ) return file;
-        return new File("src/main/smp",fname+".smp");
-    }
-
-    // Test case.  No source file.  Source code passed in as a String.  Fake
-    // class name.
-    CompUnit( String fname, String src ) {
-        _par  = null;
-        _name = fname;
-        _fname= fname;
-        _cname= fname;
-        _smp  = null;
-        _src  = src;
-    }
-
-    // Record source discovery without adding an initialization edge.
-    void addDep(CompUnit dep) {
-        if( _deps == null ) _deps = new Ary<>(CompUnit.class);
-        _deps.add(dep);
-    }
-
-    public void addFun(CodeGen code, FunNode fun) {
-        assert fun.in(1)==_start;
-        _stop.addDef(fun.ret());
-        code.add(_stop);
-        _stop.addDep(fun);
-    }
-
-    void setStart(CodeGen code) {
-        _stop  = new  StopCUNode().init();
-        _start = new StartCUNode(code._start,_stop, Type.BOTTOM, _fname).init();
-        code._stop.addDef(_stop);
-    }
-
-    @Override public String toString() {
-        String x = "{"+_cname;
-        if( _smp!=null && _smp.exists()) x += ",hasSMP";
-        if( _src!=null   ) x += ",hasSrc";
-        x += "}";
-        return x;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ElfWriter.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ElfWriter.java
deleted file mode 100644
index c52209dd..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ElfWriter.java
+++ /dev/null
@@ -1,460 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeFunPtr;
-import com.seaofnodes.simple.type.TypeStruct;
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.BAOS;
-import java.io.*;
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.util.HashMap;
-
-public class ElfWriter {
-
-    final CodeGen _code;
-    Ary<Section> _sections;
-    StringSection _strtab;
-
-    ElfWriter( CodeGen code ) {
-        _code = code;
-    }
-
-    // ------------------------------------------------------------------------
-    abstract public class Section {
-        static final int SHT_NULL    = 0;
-        static final int SHT_PROGBITS= 1;
-        static final int SHT_SYMTAB  = 2;
-        static final int SHT_STRTAB  = 3;
-        static final int SHT_RELA    = 4;
-
-        final String _name;
-        final int _type, _entsize, _index, _name_pos, _flags;
-        int _link, _info;
-        int _file_offset;
-
-        Section(String name, int type, int entsize, int flags) {
-            _name = name;
-            _type = type;
-            _entsize = entsize;
-            _flags = flags;
-            _index = _sections._len;
-            _sections.push(this);
-            _name_pos = name.isEmpty()
-                    ? 0  // Null section
-                    : _strtab == null
-                    ? 1  // StringSection
-                    // All the other sections
-                    : _strtab.writeCString(name);
-        }
-
-        void writeHeader(ByteBuffer out) {
-            out.putInt(_name_pos);     // name
-            out.putInt(_type);         // type
-            out.putLong(_flags);       // flags
-            out.putLong(0);            // addr
-            out.putLong(_file_offset); // offset
-            out.putLong(size());       // size
-            out.putInt(_link);         // link
-            out.putInt(_info);         // info
-            out.putLong(16);           // addralign
-            out.putLong(_entsize);     // Fixed-size element size
-        }
-
-        abstract void write(ByteBuffer out);
-        abstract int size();
-    }
-
-    // ------------------------------------------------------------------------
-    // Generic data sections; carries about a BAOS for bits
-    public class DataSection extends Section {
-        static final int SHF_WRITE     = 1;
-        static final int SHF_ALLOC     = 2;
-        static final int SHF_EXECINSTR = 4;
-        static final int SHF_INFO_LINK = 64;
-
-        final BAOS _contents;
-
-        DataSection( String name, int type, int flags, int entsize ) { this(name, type, flags, entsize, new BAOS() ); }
-        DataSection( String name, int type, BAOS contents, int flags ) { this(name, type, flags, 0, contents ); }
-        private DataSection( String name, int type, int flags, int entsize, BAOS contents ) {
-            super(name, type, entsize, flags);
-            _contents = contents;
-        }
-
-        @Override void write(ByteBuffer out) { out.put(_contents.toByteArray()); }
-        @Override int size() { return _contents.size(); }
-        public void write2( int op ) {
-            _contents.write(op    );
-            _contents.write(op>> 8);
-        }
-        public void write4( int op ) {
-            _contents.write(op    );
-            _contents.write(op>> 8);
-            _contents.write(op>>16);
-            _contents.write(op>>24);
-        }
-        public void write8( long i64 ) {
-            write4( (int) i64     );
-            write4( (int)(i64>>32));
-        }
-
-    }
-
-    // ------------------------------------------------------------------------
-    // Section to collect and de-dup strings
-    public class StringSection extends DataSection {
-        final HashMap<String,Integer> _dedup = new HashMap<>();
-
-        StringSection() {
-            super(".strtab",SHT_STRTAB, 0, 0 );
-            int emptyoff = writeCString("");   // Always empty string at offset 0
-            assert emptyoff == 0;
-            int namepos = writeCString(".strtab");
-            assert namepos == _name_pos;
-        }
-
-        public int writeCString(String name) {
-            if( name==null ) return 0; // Anonymous functions have no name
-            Integer ii = _dedup.get(name);
-            if( ii != null ) return ii;
-            // place name in the string table
-            int pos = _contents.size();
-            _dedup.put(name,pos);
-            byte[] name_bytes = name.getBytes();
-            _contents.write(name_bytes);
-            // the strings are null terminated
-            _contents.write(0);
-            return pos;
-        }
-    }
-
-    // ------------------------------------------------------------------------
-    // The relocations; 3 words per relocation
-    public class ReloSection extends DataSection {
-        ReloSection( int info ) {
-            this(".rela.text",info);
-        }
-        ReloSection(String name,int info) {
-            super(name, SHT_RELA, SHF_INFO_LINK, 24/*entsize*/);
-            _link = 2;
-            _info = info;
-        }
-
-        void writeReloOffPlus(int offset, int symidx, byte relo) {
-            writeRelo(offset,symidx,relo,-4);
-        }
-        void writeRelo(int offset,int symidx,byte relo,long addend) {
-            assert symidx > 0;
-            write8(offset);
-            write8(((long)symidx << 32L) | relo);
-            write8(addend);
-        }
-    }
-
-
-    // ------------------------------------------------------------------------
-    // Symbols section; emit the symbols into the data section directly
-    public class SymbolSection extends DataSection {
-        public static final int SYMBOL_SIZE = 4+1+1+2+8+8;
-        final BAOS _globals;
-        final int _nlocals;
-
-        SymbolSection(int nlocals) {
-            super(".symtab", SHT_SYMTAB, 0/*flags*/, SYMBOL_SIZE);
-            _globals = new BAOS();
-            _nlocals = nlocals;
-        }
-
-        // Global symbol index
-        int gidx() { return _nlocals+(_globals.size()/SYMBOL_SIZE); }
-
-        public int symbol( String name, int shndx, int bind, int type, long value, long size ) {
-            int gidx = gidx();  // Global index before I write to _globals
-            BAOS baos = bind==SYM_BIND_LOCAL ? _contents : _globals;
-            write4(baos,_strtab.writeCString(name));
-            int info = (bind << 4) | (type & 0xF);
-            baos.write(info);
-            baos.write(0);      // other/visibility
-            write2(baos,shndx); // section index
-            write8(baos,value);
-            write8(baos,size);
-            return bind==SYM_BIND_LOCAL ? -99 : gidx;
-        }
-
-        public int symbol( String name, int shndx, int bind, int type ) {
-            return symbol(name,shndx,bind,type,0,0);
-        }
-
-        // creates function and stores where it starts.
-        // Filters to just this class.obj file.
-        void encodeFunctions(StopNode stop, Encoding enc, int text_idx, boolean emitEntrySymbol) {
-            for( Node stopcu : stop._inputs ) {
-                for( Node ret : stopcu._inputs ) {
-                    FunNode fun = ((ReturnNode)ret).fun();
-                    if( !_code.owns(fun) )
-                        continue;
-                    int end = enc.opStart(fun.ret()) + enc.opLen(fun.ret());
-                    long value = enc.opStart(fun);
-                    long size = end - value;
-                    if( fun._name != null ) { // Anonymous functions have no name
-                        // The C runtime owns `main` and adapts argc/argv into
-                        // a normal Simple array.  Keep the Simple function on
-                        // its native ABI under a private entry symbol.
-                        String name = emitEntrySymbol && "main".equals(fun._name)
-                            ? "simple_main"
-                            : fun._name;
-                        symbol(name, text_idx, SYM_BIND_GLOBAL, SYM_TYPE_FUNC, value, size);
-                    }
-                }
-            }
-        }
-
-        // Insert a default-main for top-level compilations, if the top-level
-        // does not declare a main.
-        void symbolEntryClinit(int text_idx, Encoding enc) {
-            FunNode clinit = null;
-            String entryName = _code.entryClinitName();
-            for( FunNode fun : _code._linker )
-                if( fun != null && _code.owns(fun) ) {
-                    if( "main".equals(fun._name) )
-                        return; // encodeFunctions exported this as simple_main
-                    if( entryName.equals(fun._name) )
-                        clinit = fun; // Keep top-level entry, if we don't find an explicit main
-                }
-            // No top-level main, so the top-level clinit becomes a default main
-            if( clinit != null ) {
-                assert enc.opStart(clinit) == 0;
-                symbol("simple_main",text_idx, SYM_BIND_GLOBAL, SYM_TYPE_FUNC, enc.opStart(clinit), 0);
-                return;
-            }
-            throw new IllegalStateException("Missing entry <clinit> "+entryName);
-        }
-
-        static void write2( BAOS bits, int op ) {
-            bits.write(op    );
-            bits.write(op>> 8);
-        }
-        static void write4( BAOS bits, int op ) {
-            bits.write(op    );
-            bits.write(op>> 8);
-            bits.write(op>>16);
-            bits.write(op>>24);
-        }
-        static void write8( BAOS bits, long i64 ) {
-            write4(bits, (int) i64     );
-            write4(bits, (int)(i64>>32));
-        }
-
-        @Override
-        void writeHeader(ByteBuffer out) {
-            // points to string table section
-            _link = _strtab._index;
-            _info = _nlocals;
-            super.writeHeader(out);
-        }
-
-        @Override void write(ByteBuffer out) {
-            out.put(_contents.toByteArray());
-            out.put(_globals .toByteArray());
-        }
-        @Override int size() {
-            return _contents.size() + _globals.size();
-        }
-    }
-
-    public static final int SYM_BIND_LOCAL   = 0;
-    public static final int SYM_BIND_GLOBAL  = 1;
-    public static final int SYM_BIND_WEAK    = 2;
-
-    public static final int SYM_TYPE_NOTYPE  = 0;
-    public static final int SYM_TYPE_OBJECT  = 1;
-    public static final int SYM_TYPE_FUNC    = 2;
-    public static final int SYM_TYPE_SECTION = 3;
-
-    public static final int SECTION_HDR_SIZE = 64;
-
-    // ------------------------------------------------------------------------
-
-
-    // ------------------------------------------------------------------------
-
-    // Native code can live above 4G, outside our four-byte function pointers.
-    // Give address-taken natives a low entry which tail-jumps through the PLT.
-    // A weak, stable name makes references from separate objects agree on one
-    // entry. Do not patch references straight to the local copy: that would
-    // bypass the linker's choice and break pointer equality across objects.
-    private int nativeEntry(String name, HashMap<String,Integer> entries,
-                            DataSection text, SymbolSection symbols, ReloSection relos) {
-        Integer old = entries.get(name);
-        if( old!=null ) return old;
-        int offset = text.size();
-        text._contents.write(0xE9); // jmp rel32; preserve arguments and return address
-        text.write4(0);
-        int target = symbols.symbol(name,0,SYM_BIND_GLOBAL,SYM_TYPE_FUNC);
-        relos.writeReloOffPlus(offset+1,target,(byte)4/*PLT32*/);
-        int entry = symbols.symbol("__simple_native$"+name,text._index,
-                                   SYM_BIND_WEAK,SYM_TYPE_FUNC,offset,5);
-        entries.put(name,entry);
-        return entry;
-    }
-
-    public ElfWriter export(boolean emitEntrySymbol) {
-        // Sections are created in the order they are emitted.
-        _sections = new Ary<>(Section.class);
-
-        // Null section
-        Section nullSection = new DataSection("",Section.SHT_NULL,0,0);
-
-        // String section next; written out early and available to record/dedup
-        // strings for all remaining sections
-        _strtab = new StringSection();
-
-        // place all the symbols
-        int nlocals = 1/*null*/+9/*number of sections*/;
-        SymbolSection symbols = new SymbolSection(nlocals);
-
-        // we've already constructed these entire sections in the encoding phase
-        Encoding enc = _code._encoding;
-        // Append ELF-only thunks to a copy. Export must not change instruction
-        // offsets or the image used by the in-memory linker and emulators.
-        BAOS textBits = new BAOS(enc._bits.toByteArray(),enc._bits.size());
-        DataSection text   = new DataSection(".text"  , Section.SHT_PROGBITS, textBits, DataSection.SHF_ALLOC | DataSection.SHF_WRITE | DataSection.SHF_EXECINSTR );
-        // Constant pool
-        DataSection rodata = new DataSection(".rodata", Section.SHT_PROGBITS, enc._cpool, DataSection.SHF_ALLOC );
-        // Static/global pool
-        DataSection rwdata = new DataSection(".data"  , Section.SHT_PROGBITS, enc._sdata, DataSection.SHF_ALLOC | DataSection.SHF_WRITE );
-
-
-        // populate function symbols
-        symbols.encodeFunctions(_code._stop, _code._encoding, text._index, emitEntrySymbol);
-        // Export the source compilation unit <clinit> as the C runtime "main".
-        // Encoding keeps this function at text offset zero.
-        if( emitEntrySymbol )
-            symbols.symbolEntryClinit(text._index,enc);
-
-        // create external .text relocations
-        ReloSection relocations = new ReloSection(text._index);
-        HashMap<String,Integer> nativeEntries = new HashMap<>();
-
-        for( Node n : enc._externals.keySet()) {
-            String extern = enc._externals.get(n);
-            boolean nativeAddress = n instanceof FunPtrNode &&
-                _code.externFunc(((TypeFunPtr)n._type).fidx())!=null;
-            int symidx = nativeAddress
-                ? nativeEntry(extern,nativeEntries,text,symbols,relocations)
-                : symbols.symbol(extern,0,SYM_BIND_GLOBAL,SYM_TYPE_FUNC);
-            int offset = enc.opStart(n) + enc.opLen(n) - 4;
-            // Address materialization and static fields name the same thunk;
-            // direct calls still go straight to the native symbol's PLT entry.
-            relocations.writeReloOffPlus(offset,symidx,(byte)(nativeAddress ? 2/*PC32*/ : 4/*PLT32*/));
-        }
-
-        // Native ELF output is AMD64. Data addresses use PC32, not PLT calls.
-        for( Node n : enc._externData.keySet() ) {
-            String extern = enc._externData.get(n);
-            int symidx = symbols.symbol(extern, 0, SYM_BIND_GLOBAL, SYM_TYPE_OBJECT);
-            int offset = enc.opStart(n) + enc.opLen(n) - 4;
-            relocations.writeReloOffPlus(offset, symidx, (byte)2/*PC32*/);
-        }
-
-        // Stable function identities are also addressable from data, including
-        // anonymous functions which have no source-level exported name.
-        HashMap<String,Integer> dataSymbols=new HashMap<>();
-        for( FunNode fun : _code._linker )
-            if( fun!=null && !fun.isDead() && _code.owns(fun) && enc.opStart(fun)>=0 ) {
-                String name=_code._fidxs.symbol(fun.sig().fidx());
-                dataSymbols.put(name,symbols.symbol(name,text._index,SYM_BIND_GLOBAL,SYM_TYPE_FUNC,enc.opStart(fun),0));
-            }
-        for( StaticData.ObjectData obj : enc._data.objects.values() ) {
-            int section=obj.external ? 0 : obj.readOnly ? rodata._index : rwdata._index;
-            dataSymbols.put(obj.symbol,symbols.symbol(obj.symbol,section,SYM_BIND_GLOBAL,SYM_TYPE_OBJECT,
-                                                     obj.external ? 0 : obj.offset,obj.external ? 0 : obj.size));
-        }
-        for( Encoding.Relo relo : enc._bigCons.values() ) {
-            StaticData.ObjectData obj=enc._data.object(relo._t);
-            relocations.writeReloOffPlus(relo._opStart+relo._off,dataSymbols.get(obj.symbol),relo._elf);
-        }
-        ReloSection roRelos=new ReloSection(".rela.rodata",rodata._index);
-        ReloSection rwRelos=new ReloSection(".rela.data",rwdata._index);
-        for( StaticData.Relocation relo : enc._data.relocations ) {
-            String name=enc._data.targetSymbol(relo.value());
-            String nativeName=relo.value() instanceof TypeFunPtr fp ? _code.externFunc(fp.fidx()) : null;
-            Integer sym=nativeName==null ? dataSymbols.get(name)
-                : nativeEntry(nativeName,nativeEntries,text,symbols,relocations);
-            if( sym==null ) {
-                sym=symbols.symbol(name,0,SYM_BIND_GLOBAL,SYM_TYPE_NOTYPE);
-                dataSymbols.put(name,sym);
-            }
-            // AMD64 absolute 32/64-bit addresses; linker rejects overflow.
-            byte kind=(byte)(relo.logSize()==2 ? 10 : 1);
-            (relo.object().readOnly ? roRelos : rwRelos).writeRelo(relo.object().offset+relo.offset(),sym,kind,0);
-        }
-
-        // Create a "Simple" section for Simple types and ir
-
-        // Write the local section header symbols
-        assert nlocals == 1+_sections._len;
-        symbols.symbol("",0,0,0); // Null symbol at index 0
-        for( Section s : _sections )
-            symbols.symbol(s._name, s._index, SYM_BIND_LOCAL, SYM_TYPE_SECTION, 0, s.size());
-
-        int size = 64; // ELF header size
-        // size of all section data
-        for( Section s : _sections ) {
-            s._file_offset = size;
-            size += s.size();
-        }
-        // headers go at the very end
-        int shdr_offset = size;
-        size += SECTION_HDR_SIZE*_sections.len();
-
-        ByteBuffer out = ByteBuffer.allocate(size);
-        out.order(ByteOrder.LITTLE_ENDIAN);
-
-        // ELF header
-        out.put(new byte[]{ 0x7F, 'E', 'L', 'F', 2, 1, 1, 0 });
-        out.put(new byte[8]);
-        out.putShort((short)1 /* ET_REL */); // type
-        out.putShort((short)62 /* AMD64 */); // machine
-        out.putInt(1);                // version
-        out.putLong(0);               // entry
-        out.putLong(0);               // phoff
-        out.putLong(shdr_offset);     // shoff
-        out.putInt(0);                // flags
-        out.putShort((short)64);      // ehsize
-        out.putShort((short)0);       // phentsize
-        out.putShort((short)0);       // phnum
-        out.putShort((short)64);      // shentsize
-        out.putShort((short) _sections.len()); // shnum
-        out.putShort((short) _strtab._index);  // shstrndx
-
-        // raw section data
-        for( Section s : _sections )
-            s.write(out);
-
-        // Section headers
-        for( Section s : _sections )
-            s.writeHeader(out);
-
-        assert out.position() == size;
-
-        String objName = _code._buildDir + "/" + _code._srcName + ".o";
-        File file = new File(objName);
-        if( file.getParentFile()!=null )
-            file.getParentFile().mkdirs();
-        try {
-            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
-            bos.write(out.array());
-            bos.close();
-        } catch( IOException ioe ) {
-            // Caller does not want to deal, but it is a failed compilation in any case
-            throw new RuntimeException(ioe);
-        }
-        // Reset for next ELF
-        _sections = null;
-        _strtab = null;
-        return this;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Encoding.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Encoding.java
deleted file mode 100644
index 06bf14f5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Encoding.java
+++ /dev/null
@@ -1,570 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.print.IRPrinter;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.*;
-import java.util.*;
-
-
-/**
- *  Instruction encodings
- * <p>
- *  This class holds the encoding bits, plus the relocation information needed
- *  to move the code to a non-zero offset, or write to an external file (ELF).
- * <p>
- *  There are also a bunch of generic utilities for managing bits and bytes
- *  common in all encodings.
- */
-public class Encoding implements com.seaofnodes.isa.CodeSink {
-
-    // Top-level program graph structure
-    public final CodeGen _code;
-
-    // CFG Nodes in RPO order, per-encoding.
-    public Ary<CFGNode> _cfg;
-
-    // Instruction bytes.  The registers are encoded already.  Relocatable data
-    // is in a fixed format depending on the kind of relocation.
-
-    // - RIP-relative offsets into the same chunk are just encoded with their
-    //   chunk relative offsets; no relocation info is required.
-
-    // - Fixed address targets in the same encoding will be correct for a zero
-    //   base; moving the entire encoding requires adding the new base address.
-
-    // - RIP-relative to external chunks have a zero offset; the matching
-    //   relocation info will be used to patch the correct value.
-
-    public final BAOS _bits  = new BAOS(); // Instructions / encodings
-    public final BAOS _cpool = new BAOS(); // Constant r/o pool
-    public final BAOS _sdata = new BAOS(); // Static   r/w pool
-    public final HashMap<Node,Relo> _bigCons = new HashMap<>();
-    public final StaticData _data;
-    public final HashMap<String,Integer> _externalAddresses = new HashMap<>();
-
-    // Big Constant relocation info.
-    public static class Relo {
-        public final Node _op;
-        public final Type _t;          // Constant type
-        public final int _align;       // Log alignment, captured for diagnostic display
-        public final int _structSize;  // Capture layout during encoding, not printing
-        public final byte _off;        // Offset from start of opcode
-        public final byte _elf;        // ELF relocation type, e.g. 2/PC32
-        public int _target;            // Where constant is finally placed
-        public int _opStart;           // Opcode start
-        Relo( Node op, Type t, byte off, byte elf ) {
-            _op=op;  _t=t;  _off=off; _elf=elf;
-            _align = t.alignment();
-            _structSize = t instanceof TypeStruct ts ? ts.size() : 0;
-            _readOnly = readOnly(t);
-        }
-        public boolean readOnly() { return _readOnly; }
-        private final boolean _readOnly;
-        private static boolean readOnly(Type t) {
-            // Class initializers still write their fields, even when every
-            // final value is constant.  Their storage must remain writable.
-            return !(t instanceof TypeStruct ts) ||
-                (!Parser.startsClzPrefix(ts._name) && ts.isConstant());
-        }
-    }
-
-    Encoding( CodeGen code ) {
-        _code = code;
-        _data = new StaticData(this);
-    }
-
-    // Shortcut to the defining register
-    public short reg(Node n) {
-        return _code._regAlloc.regnum(n);
-    }
-
-    public int read1(int idx) {
-        byte[] buf = _bits.buf();
-        return (buf[idx]&0xFF);
-    }
-    public int read2(int idx) {
-        byte[] buf = _bits.buf();
-        return (buf[idx]&0xFF) | (buf[idx+1]&0xFF) <<8;
-    }
-    public int read4(int idx) {
-        byte[] buf = _bits.buf();
-        return (buf[idx]&0xFF) | (buf[idx+1]&0xFF) <<8 | (buf[idx+2]&0xFF)<<16 | (buf[idx+3]&0xFF)<<24;
-    }
-    public long read8(int idx) {
-        return (read4(idx) & 0xFFFFFFFFL) | read4(idx+4);
-    }
-
-    // This buffer is invalid/moving until after all encodings are written
-    public byte[] bits() { return _bits.buf(); }
-
-    // 4 byte little-endian write
-    public void patch4( int idx, int val ) {
-        byte[] buf = _bits.buf();
-        buf[idx  ] = (byte)(val    );
-        buf[idx+1] = (byte)(val>> 8);
-        buf[idx+2] = (byte)(val>>16);
-        buf[idx+3] = (byte)(val>>24);
-    }
-
-    static void padN(int n, BAOS bits) {
-        while( (bits.size()+n-1 & -n) > bits.size() )
-            bits.write(0);
-    }
-
-    // Convenience for writing log-N
-    static void addN( int log, long x, BAOS bits ) {
-        for( int i=0; i < 1<<log; i++ ) {
-            bits.write((int)x);
-            x >>= 8;
-        }
-    }
-
-    public Encoding add1( int op ) { addN(0,op,_bits); return this; }
-    public Encoding add2( int op ) { addN(1,op,_bits); return this; }
-    public Encoding add4( int op ) { addN(2,op,_bits); return this; }
-    public Encoding add8(long op ) { addN(3,op,_bits); return this; }
-
-    private final static int SENTINEL = -1;
-    private final IntHashMap _opStart = new IntHashMap(SENTINEL);
-    private final IntHashMap _opLen   = new IntHashMap(SENTINEL);
-
-
-    // Read op start for n
-    public int opStart(Node n) { return _opStart.get(n._nid); }
-    // Read op length for n
-    public byte opLen (Node n) { return (byte)_opLen.get(n._nid); }
-
-    // Set op start for n
-    public void opStart(Node n, int off) {
-        assert off != SENTINEL;
-        _opStart.put(n._nid,off);
-    }
-
-    // Set op start for n
-    public void opStartAdd(Node n, int off) {
-        if( off==0 ) return;
-        int old = _opStart.get(n._nid);
-        assert old != SENTINEL && old+off != SENTINEL;
-        _opStart.put(n._nid,old+off);
-    }
-
-    // Set op length for n
-    public void opLen(Node n, byte len) {
-        assert len != SENTINEL;
-        _opLen.put(n._nid,len);
-    }
-
-    // Nodes need "relocation" patching; things done after code is placed.
-    // Record src and dst Nodes.
-    private final HashMap<Node,CFGNode> _internals = new HashMap<>();
-    // Source is a Call, destination in the Fun.
-    public Encoding relo( CallNode call ) {
-        FunNode fun = _code.link(call.tfp());
-        if( fun != null && !_code.owns(fun) )
-            _externals.put(call,fun._name);
-        else
-            _internals.put(call,fun);
-        return this;
-    }
-    // Code address as a constant
-    public Encoding relo( FunPtrNode fptr ) {
-        TypeFunPtr tfp = (TypeFunPtr)fptr._type;
-        // Native functions have no local FunNode, but are still callable.
-        // Do not treat their addresses as identities of deleted functions.
-        String nativeName = _code.externFunc(tfp.fidx());
-        if( nativeName!=null ) return external(fptr,nativeName);
-        FunNode fun = _code.link(tfp);
-        if( fun != null && !_code.owns(fun) )
-            _externals.put(fptr,fun._name);
-        else
-            _internals.put(fptr,fun);
-        return this;
-    }
-    // Local jump
-    public void jump( CFGNode jmp, CFGNode dst ) {
-        _internals.put(jmp,dst.uctrlSkipEmpty());
-    }
-
-    // External references only located by Strings a link-time
-    public final HashMap<Node,String> _externals = new HashMap<>();
-    public Encoding external( Node n, String extern ) {
-        _externals.put(n,extern);
-        return this;
-    }
-
-    public final HashMap<Node,String> _externData = new HashMap<>();
-    public void externalData(Node n, String name) { _externData.put(n,name); }
-
-    // Store t as a 32/64 bit constant in the code space; generate RIP-relative
-    // addressing to load it.  Type is stored in either the .rodata or .data.
-    public void largeConstant( Node relo, Type t, int off, int elf ) {
-        // TODO: Any-old struct in the cpool
-        assert t.isConstant() || (t instanceof TypeStruct ts && Parser.startsClzPrefix(ts._name));
-        assert (byte)off == off;
-        assert (byte)elf == elf;
-        _bigCons.put(relo,new Relo(relo,t,(byte)off,(byte)elf));
-    }
-
-    // --------------------------------------------------
-    Encoding encode( ) {
-        // Basic block layout: negate branches to keep blocks in-order; insert
-        // unconditional jumps.  Attempt to keep backwards branches taken,
-        // forwards not-taken (this is the default prediction on most
-        // hardware).  Layout is still Reverse Post Order but with more
-        // restrictions.
-        basicBlockLayout( );
-
-        // Write encoding bits in order into a big byte array.
-        // Record opcode start and length.
-        writeEncodings();
-
-        // Short-form RIP-relative support: replace long encodings with short
-        // encodings and compact the code, changing all the offsets.
-        compactShortForm();
-
-        // Place pool objects and record relocations within their contents.
-        _data.write();
-
-        // Patch RIP-relative and local encodings now.
-        patchLocalRelocations();
-
-        return this;
-    }
-
-    // --------------------------------------------------
-    // Basic block layout: negate branches to keep blocks in-order; insert
-    // unconditional jumps.  Attempt to keep backwards branches taken, forwards
-    // not-taken (this is the default prediction on most hardware).  Layout is
-    // still Reverse Post Order but with more restrictions.
-    private void basicBlockLayout( ) {
-        IdentityHashMap<LoopNode,Ary<CFGNode>> rpos = new IdentityHashMap<>();
-        _cfg = new Ary<>(CFGNode.class);
-        rpos.put(_code._start.loop(),_cfg);
-        BitSet visit = _code.visit();
-
-        // Do them all except the <clinit>s
-        Ary<FunNode> clinits = new Ary<>(FunNode.class);
-        FunNode entry = null;
-        String entryName = _code.entryClinitName();
-        for( FunNode fun : _code._linker ) {
-            if( fun != null && !fun.isDead() && _code.owns(fun) ) {
-                if( fun.isClz() ) {
-                    if( fun._name.equals(entryName) )
-                        entry = fun;
-                    else
-                        clinits.add(fun);
-                } else {
-                    int x = _cfg._len;
-                    _rpo_cfg(fun,visit,rpos);
-                    assert _cfg.at(x) instanceof ReturnNode;
-                }
-            }
-        }
-        // Now the <clinit>s last, so when reversed they become first.  The
-        // program entry <clinit> is last of all, so it lands at offset zero.
-        for( FunNode clinit : clinits ) {
-            int x = _cfg._len;
-            _rpo_cfg(clinit,visit,rpos);
-            assert _cfg.at(x) instanceof ReturnNode;
-        }
-        if( entry != null ) {
-            int x = _cfg._len;
-            _rpo_cfg(entry,visit,rpos);
-            assert _cfg.at(x) instanceof ReturnNode;
-        }
-
-
-        // Reverse in-place
-        for( int i=0; i< _cfg.size()>>1; i++ )
-            _cfg.swap(i,_cfg.size()-1-i);
-        visit.clear();
-    }
-
-
-    private void _rpo_cfg(CFGNode bb, BitSet visit, IdentityHashMap<LoopNode,Ary<CFGNode>> rpos ) {
-        if( bb==null || visit.get(bb._nid) ) return;
-        visit.set(bb._nid);
-        CFGNode next = bb.uctrl();
-
-        // Loops run an inner "rpo_cfg", then append the entire loop body in
-        // place.  This keeps loop bodies completely contained, although if
-        // Some Day Later we have real profile data we ought to arrange the
-        // branch orderings based on frequency.
-        if( bb instanceof LoopNode loop ) {
-            Ary<CFGNode> body = new Ary<>(CFGNode.class); // Private RPO for the loop
-            rpos.put(loop.loop(),body);                   // Find it via loop tree
-            _rpo_cfg(next,visit,rpos);                    // RPO the loop
-            body.add(loop);                               // Include loop last (first in RPO)
-            Ary<CFGNode> outer = rpos.get(loop.cfg(1).loop());
-            outer.addAll(body); // Append to original CFG
-            return;
-        }
-
-        // IfNodes visit 2 sides, and may choose to reorder them in the RPO
-        if( bb instanceof IfNode iff ) {
-            // Pick out the T/F projections
-            CProjNode t = iff.cproj(0);
-            CProjNode f = iff.cproj(1);
-            // Invert the branch or not
-            if( shouldInvert(t,f,iff.loopDepth()) ) {
-                iff.negate();
-                t.invert();
-                f.invert();
-                CProjNode tmp=f; f=t; t=tmp; // Swap t/f
-            }
-
-            // Whichever side is visited first becomes last in the RPO.  With
-            // no loops, visit the False side last (so True side first) so that
-            // when the False RPO visit returns, the IF is immediately next.
-            // When the RPO is reversed, the fall-through path will always be
-            // following the IF.
-            _rpo_cfg(t,visit,rpos); // True side first
-            next = f;               // False side last
-        }
-
-        // If the *next* BB has already been visited, and we are not already a
-        // jump, we may need an unconditional forwards jump here
-        Ary<CFGNode> rpo = rpos.get(bb.loop());
-        if( next!=null && visit.get(next._nid) && !(bb instanceof IfNode) ) {
-            boolean needJump = next instanceof LoopNode
-                // Empty blocks from an IF will invert the IF and backwards
-                // branch to the loop head.  If not empty, or not an IF
-                // will need a jump.
-                ? (bb.nOuts()>1 || !(bb.cfg0() instanceof IfNode) )
-                // Forwards jump.  If all the blocks, in RPO order, to our
-                // target are empty, we will fall in and not need a jump.
-                : !backwardsEmptyScan(rpo,next);
-            if( needJump ) {
-                CFGNode jmp = _code._mach.jump();
-                jmp._ltree = bb._ltree;
-                jmp.setDefX(0,bb);
-                next.setDef(next._inputs.find(bb),jmp);
-                rpo.add(jmp);
-            }
-        }
-
-        _rpo_cfg(next,visit,rpos);
-        rpo.add(bb);
-    }
-
-    // Should this test be inverted?
-    private static boolean shouldInvert(CFGNode t, CFGNode f, int bld) {
-        int tld = t.loopDepth(), fld = f.loopDepth();
-        // These next two are symmetric and can happen in any order; if `tld <
-        // bld` is true, then `fld < bld` must be false, or else both directions
-        // exit the loop... and the IF test would not be in the loop.
-
-        // true to exit a loop usually (and false falls into Yet Another Loop
-        // Block), invert if false is taking an empty backwards branch.
-        if( tld < bld ) return  forwardsEmptyScan(f,bld);
-        // false to exit a loop, normally invert to true (except empty back)
-        if( fld < bld ) return !forwardsEmptyScan(t,bld);
-
-        // Not exiting the loop; staying at this depth (or going deeper loop).
-
-        // Jump/true to an empty backwards block
-        if( forwardsEmptyScan(t,bld) ) return false;
-        if( forwardsEmptyScan(f,bld) ) return true ;
-
-        // Fall/false into a full block, Jump/true to an empty block.
-        if( f.nOuts()>1 && t.nOuts()==1 ) return false;
-        if( t.nOuts()>1 && f.nOuts()==1 ) return true ;
-        // Jump to a merge point, assuming other things are jumping there as well
-        if( f.out(0) instanceof RegionNode ) return true ;
-        if( t.out(0) instanceof RegionNode ) return false;
-        // Everything else equal, use pre-order
-        return t._pre > f._pre;
-    }
-
-    // Do we continue forwards from 'c' to the Loop back edge, without doing
-    // anything else?  Then this branch can directly jump to the loop head.
-    private static boolean forwardsEmptyScan( CFGNode c, int bld ) {
-        if( c.nOuts()!=1 || c.loopDepth()!=bld ) return false;
-        return c.uctrl() instanceof RegionNode cfg &&
-            ((cfg instanceof LoopNode && cfg._ltree==c._ltree) || forwardsEmptyScan(cfg,bld));
-    }
-
-    // Is the CFG from "next" to the end empty?  This means jumping to "next"
-    // will naturally fall into the end.
-    private static boolean backwardsEmptyScan(Ary<CFGNode> rpo, CFGNode next) {
-        for( int i=rpo._len-1; rpo.at(i)!=next; i-- )
-            if( rpo.at(i).nOuts()!=1 )
-                return false;
-        return true;
-    }
-
-    // --------------------------------------------------
-    // Write encoding bits in order into a big byte array.
-    // Record opcode start and length.
-
-    // Current function is used by the spill-op encodings to query the stack
-    // frame layout and get the spill offsets.
-    private void writeEncodings() {
-        for( CFGNode bb : _cfg ) {
-            if( !(bb instanceof MachNode mach0) )
-                opStart(bb, _bits.size());
-            else if( bb instanceof FunNode ) {
-                opStart(bb, _bits.size());
-                mach0.encoding( this );
-                opLen(bb, (byte) (_bits.size() - opStart(bb)));
-            }
-            for( Node n : bb._outputs ) {
-                if( n instanceof MachNode mach && !(n instanceof FunNode) &&
-                    // FunPtrs are encoding in the block of their control, not
-                    // the block of the ReturnNode input - which is also a CFG.
-                    !(n instanceof FunPtrNode && bb instanceof ReturnNode) ) {
-                    opStart(n, _bits.size());
-                    mach.encoding( this );
-                    opLen(n, (byte) (_bits.size() - opStart(n)));
-                }
-            }
-        }
-    }
-
-    // --------------------------------------------------
-    // Short-form RIP-relative support: replace short encodings with long
-    // encodings and expand the code, changing all the offsets.
-    private void compactShortForm() {
-        int len = _cfg._len;
-        int[] oldStarts = new int[len];
-        for( int i=0; i<len; i++ )
-            oldStarts[i] = opStart(_cfg.at(i));
-
-        // TODO: Rewrite this algo to use the small "_jmps" list of just the
-        // jumps instead of walking all blocks.
-        // TODO2: Allow short encodings on non-jumps.  This algo doesn't
-        // really care jumps vs other rip-relative things.
-
-        // Check the size of short jumps, adjust the block starts for a whole
-        // pass over all blocks.  If some jumps go long, they might stretch the
-        // distance for other jumps, so another pass is needed.
-        int slide = -1;
-        while( slide != 0) {    // While no fails
-            slide = 0;
-            for( int i=0; i<len; i++ ) {
-                CFGNode bb = _cfg.at(i);
-                opStartAdd(bb, slide);
-                // Slide down all other (non-CFG) ops in the block
-                for( Node n : bb._outputs )
-                    if( n instanceof MachNode && !(n instanceof CFGNode) &&
-                        // Match writeEncodings(): FunPtrs are encoded in the
-                        // block of their control, not again at the Return.
-                        !(n instanceof FunPtrNode && bb instanceof ReturnNode) )
-                        opStartAdd(n, slide);
-                if( bb instanceof RIPRelSize riprel ) {
-                    CFGNode target = (bb instanceof IfNode iff ? iff.cproj(0) : (CFGNode)bb.out(0)).uctrlSkipEmpty();
-                    // Delta is from opStart to opStart.  X86 at least counts
-                    // the delta from the opEnd, but we don't have the end until
-                    // we decide the size - so the encSize has to deal
-                    int delta = opStart(target) - opStart(bb);
-                    byte opLen = riprel.encSize(delta);
-                    // Recorded size is smaller than the current size?
-                    if( opLen(bb) < opLen ) {
-                        // Start sliding the code down; record slide amount and new size
-                        slide += opLen - opLen(bb);
-                        opLen(bb, opLen);
-                    }
-                }
-            }
-        }
-
-
-        // Go again, inserting padding on function headers.  Since no
-        // short-jumps span function headers, the padding will not make any
-        // short jumps fail.
-        for( int i=0; i<len; i++ ) {
-            CFGNode bb = _cfg.at(i);
-            // Functions pad to align 16
-            if( bb instanceof FunNode ) {
-                int newStart = opStart(bb)+slide;
-                slide += (newStart+15 & -16)-newStart;
-            }
-            opStartAdd(bb, slide);
-            for( Node n : bb._outputs )
-                if( n instanceof MachNode && !(n instanceof CFGNode) &&
-                    !(n instanceof FunPtrNode && bb instanceof ReturnNode) )
-                    opStartAdd(n, slide);
-        }
-
-        // Copy/slide the bits to make space for all the longer branches
-        int grow = opStart(_cfg.at(len-1)) - oldStarts[len-1];
-        if( grow > 0 ) {        // If no short-form ops, nothing to do here
-            int end = _bits.size();
-            byte[] bits = new byte[end+grow];
-            for( int i=len-1; i>=0; i-- ) {
-                int start = oldStarts[i];
-                if( start==0 && i>1 ) continue;
-                int oldStart = oldStarts[i];
-                int newStart = opStart(_cfg.at(i));
-                System.arraycopy(_bits.buf(),oldStart,bits,newStart,end-start);
-                end = start;
-            }
-            _bits.set(bits,bits.length);
-        }
-
-    }
-
-
-    // --------------------------------------------------
-    // Patch local encodings now
-    void patchLocalRelocations() {
-        // Walk the local code-address relocations
-        for( Node src : _internals.keySet() ) {
-            int start = opStart(src);
-            Node dst =  _internals.get(src);
-            // If function is entirely dead, only the function pointer remains
-            // and, it can only be used to test against zero or equals to
-            // another function pointer... i.e., there Is No Code Here.
-            int target = dst == null ? start : opStart(dst);
-             ((RIPRelSize)src).patch(this, start, opLen(src), target - start);
-        }
-    }
-
-    // Emit a single scalar as bits
-    static void addN( int log, Type t, BAOS bits ) {
-        long x = switch( t ) {
-        case TypeInteger ti -> ti.value();
-        case TypeFloat tf -> log==3
-        ? Double.doubleToRawLongBits(    tf.value())
-        : Float.floatToRawIntBits((float)tf.value());
-        case TypeFunPtr tfp -> 0; // These need to be relocated
-        case TypeMemPtr tmp -> 0; // These need to be relocated
-        default -> { if( t==Type.NIL ) yield 0; else throw Utils.TODO(); }
-        };
-        addN(log,x,bits);
-    }
-
-    // A series of libc/external calls that Simple can link against in a JIT.
-    // Since no runtime in the JVM process, using magic numbers for the CPU
-    // emulators to pick up on.
-    public static int SENTINEL_CALLOC = -4;
-    public static int SENTINEL_WRITE  = -8;
-
-    int externalAddress(String name) {
-        Integer address=_externalAddresses.get(name);
-        if( address!=null ) return address;
-        return switch(name) {
-        case "calloc" -> SENTINEL_CALLOC;
-        case "write" -> SENTINEL_WRITE;
-        default -> throw new IllegalArgumentException("Unresolved external function '"+name+"'");
-        };
-    }
-
-    void patchGlobalRelocations() {
-        for( Node src : _externData.keySet() ) {
-            String name = _externData.get(src);
-            Integer target = _code._externDataAddresses.get(name);
-            if( target==null ) throw new IllegalArgumentException("Unresolved C data symbol '"+name+"'");
-            int start = opStart(src);
-            ((RIPRelSize)src).patch(this,start,opLen(src),target-start);
-        }
-        for( Node src : _externals.keySet() ) {
-            int start  = opStart(src);
-            String dst =  _externals.get(src);
-            int target = externalAddress(dst);
-            ((RIPRelSize)src).patch(this, start, opLen(src), target - start);
-        }
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/FinalizeIR.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/FinalizeIR.java
deleted file mode 100644
index 923486c6..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/FinalizeIR.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-import java.util.Arrays;
-
-// Comnpute field layouts only after SCCP and its peepholes converge.
-// Keep surviving functions rooted without introducing unknown callers.
-abstract class FinalizeIR {
-    static void run(CodeGen code) {
-        // Compute field layouts and replace symbolic field offsets by constants.
-        for( int i=0; i<code._start.nOuts(); i++ ) {
-            Node use = code._start.out(i);
-            if( use instanceof ConFldOffNode off ) {
-                Node con = off.asOffset();
-                assert con != null : off._ts._name+"."+off._fname;
-                off.subsume(con);
-                i--;
-            }
-        }
-        code._iter.iterate(code); // Propagate field offsets and clean up.
-
-        // Retain surviving functions for emission without adding unknown callers.
-        for( FunNode fun : code._linker )
-            if( fun != null ) {
-                // A folded static function field can leave a detached body
-                // with internal cycles. It has no callers; later phases must
-                // not revive it merely because its nodes are still allocated.
-                if( fun.isDead() || fun._type.isHigh() ) {
-                    code._linker.set(fun.sig().fidx(),null);
-                    continue;
-                }
-                code.keepInCompUnit(fun);
-            }
-        for( CompUnit cu : code._compunits.values() ) {
-            ProjNode mem = cu._start.proj(1);
-            if( mem != null ) code.add(mem.unkeep());
-        }
-        // Stable print order: initializers first, then other Returns by NID.
-        for( Node stop : code._stop._inputs )
-            Arrays.sort(stop._inputs._es,0,stop.nIns(),
-                        (x,y) -> ((((ReturnNode)x).fun().isClz() ? -1 : x._nid) -
-                                  (((ReturnNode)y).fun().isClz() ? -1 : y._nid) ));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/FinishCalls.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/FinishCalls.java
deleted file mode 100644
index 7ba696d3..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/FinishCalls.java
+++ /dev/null
@@ -1,57 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-
-// Detach analysis call edges after building the loop tree. Every live body
-// belongs to this invocation; preserve it for scheduling and emission.
-abstract class FinishCalls {
-
-
-    static void run(CodeGen code) {
-
-        // The remaining passes assume all calls are unlinked; i.e. we are throwing
-        // away the Call Graph here.  Functions only reachable from internal calls
-        // need to be re-hooked to stop/start less they go dead.
-        for( FunNode fun : code._linker ) {
-            // Already linked to start, not going dead
-            if( fun==null || fun.isDead() )
-                continue;
-
-            // Insert the post-Opto code-generation hook.  Unlike an Opto-time
-            // Start input, this no longer carries unknown-caller semantics.
-            ReturnNode ret = fun.ret();
-            StartNode start = fun._compunit._start;
-            assert start!=null;
-            if( fun.nIns() <= 1 || fun.in(1) != start ) {
-                fun.insertDef(1,start);
-                for( Node use : fun._outputs )
-                    if( use instanceof ParmNode parm )
-                        parm.insertDef(1,ConstantNode.raw(parm._type));
-                if( fun._compunit._stop._inputs.find(ret) == -1 )
-                    fun._compunit._stop.addDef(ret);
-            }
-            // Unlink from Call
-            for( int i=2; i<fun.nIns(); i++ )
-                ((CallNode)fun.in(i)).unlink(fun,i--);
-            if( fun.rpc()==null ) { // Ensure valid RPC
-                // First make sure a valid RPC; single-call into multi-fun will have each
-                // function having a single call site, so the RPC becomes a constant and
-                // folds - but since multiple targets, the Call never inlines.  Recreate a
-                // valid RPC so codegen (and Eval2) understands the calling convention.
-                ParmNode rpc = new ParmNode( "$rpc", 0, ret.rpc()._type, fun );
-                rpc.addDef(ret.rpc());
-                ret.setDef( 3, rpc.init() );
-            }
-        }
-
-        code._stop.walk(n -> {
-            if( n instanceof CallEndNode cend )
-                for( int i=1; i<cend.nIns(); i++ )
-                    if( cend.in(i) instanceof ReturnNode )
-                        cend.delDef(i--);
-            if( n instanceof CallNode call )
-                call.unlink_all();
-            return null;
-        });
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/GlobalCodeMotion.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/GlobalCodeMotion.java
deleted file mode 100644
index 4477025b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/GlobalCodeMotion.java
+++ /dev/null
@@ -1,304 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.IterPeeps.WorkList;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.Utils;
-import java.util.*;
-
-public abstract class GlobalCodeMotion {
-
-    // Arrange that the existing isCFG() Nodes form a valid CFG.  The
-    // Node.use(0) is always a block tail (either IfNode or head of the
-    // following block).  There are no unreachable infinite loops.
-    public static void buildCFG( CodeGen code ) {
-        Ary<CFGNode> rpo = new Ary<>(CFGNode.class);
-        _rpo_cfg(null, code._start, code.visit(), rpo);
-        // Reverse in-place
-        for( int i=0; i< rpo.size()>>1; i++ )
-            rpo.swap(i,rpo.size()-1-i);
-        // Set global CFG
-        code._cfg = rpo;
-
-        schedEarly(code);
-
-        // Break up shared global constants by functions
-        breakUpGlobalConstants(code._start);
-
-        code._visit.clear();
-        schedLate(code);
-    }
-
-    // Post-Order of CFG
-    private static void _rpo_cfg(CFGNode def, Node use, BitSet visit, Ary<CFGNode> rpo) {
-        if( !(use instanceof CFGNode cfg) || visit.get(cfg._nid) )
-            return;             // Been there, done that
-        assert !( def instanceof ReturnNode && use instanceof CallEndNode ); // All calls unwired now
-        assert !( def instanceof   CallNode && use instanceof     FunNode ); // All calls unwired now
-        visit.set(cfg._nid);
-        for( Node useuse : cfg._outputs )
-            _rpo_cfg(cfg,useuse,visit,rpo);
-        rpo.add(cfg);
-    }
-
-    // After early scheduling, every global chain member has Start in slot 0.
-    // Give each function one private copy of the entire dependency graph.
-    private static void breakUpGlobalConstants( StartNode start ) {
-        var globals = new IdentityHashMap<Node,Boolean>();
-        var cons = new ArrayList<Node>();
-        for( Node con : start._outputs )
-            if( con!=null && !(con instanceof CFGNode) &&
-                (con.isConst() || con instanceof MachNode mach && mach.outregmap()!=null) ) {
-                globals.put(con,true);
-                cons.add(con.keep()); // Preserve original inputs while rewiring users.
-            }
-
-        var copies = new IdentityHashMap<FunNode,IdentityHashMap<Node,Node>>();
-        for( Node con : cons )
-            for( Node use : con._outputs.asAry() ) {
-                if( use==null || globals.containsKey(use) ) continue;
-                FunNode fun = useFun(use);
-                if( fun==null ) continue; // Global metadata has no function owner.
-                assert CodeGen.CODE._mach==null || CodeGen.CODE.owns(fun);
-                var local = copies.computeIfAbsent(fun,f -> new IdentityHashMap<>());
-                Node copy = cloneGlobal(con,fun,globals,local);
-                for( int i=0; i<use.nIns(); i++ )
-                    if( use.in(i)==con )
-                        use.setDef(i,copy);
-            }
-        for( Node con : cons ) con.unkill();
-    }
-
-    private static Node cloneGlobal(Node con, FunNode fun, IdentityHashMap<Node,Boolean> globals,
-                                    IdentityHashMap<Node,Node> copies) {
-        Node copy = copies.get(con);
-        if( copy!=null ) return copy;
-        copies.put(con,copy=con.copyEmpty());
-        copy.addDef(fun);
-        for( int i=1; i<con.nIns(); i++ ) {
-            Node def = con.in(i);
-            copy.addDef(globals.containsKey(def) ? cloneGlobal(def,fun,globals,copies) : def);
-        }
-        return copy;
-    }
-
-    private static FunNode useFun(Node use) {
-        if( use instanceof ReturnNode ret ) return ret.fun();
-        if( use instanceof ParmNode parm ) return parm.fun();
-        CFGNode cfg = use.cfg0();
-        while( cfg!=null && !(cfg instanceof FunNode) )
-            cfg = cfg.idom();
-        return (FunNode)cfg;
-    }
-
-
-    // ------------------------------------------------------------------------
-    // Visit all nodes in CFG Reverse Post-Order, essentially defs before uses
-    // (except at loops).  Since defs are visited first - and hoisted as early
-    // as possible, when we come to a use we place it just after its deepest
-    // input.
-    private static void schedEarly(CodeGen code) {
-        // Reverse Post-Order on CFG
-        for( CFGNode cfg : code._cfg ) {
-            cfg.loopDepth();
-            for( Node n : cfg._inputs )
-                _schedEarly(n,code );
-            // In dead infinite loops, entire code blocks may be unreachable
-            // from below.  Reach down from the CFG to their Phis so their
-            // inputs are scheduled too.
-            if( cfg instanceof RegionNode )
-                for( Node phi : cfg._outputs )
-                    if( phi instanceof PhiNode )
-                        _schedEarly(phi,code );
-        }
-    }
-
-    private static void _schedEarly(Node n, CodeGen code) {
-        if( n==null || code._visit.get(n._nid) ) return; // Been there, done that
-        assert !(n instanceof CFGNode);
-        code._visit.set(n._nid);
-        // Schedule inputs first, except Phis: following their backedges would
-        // enter a data cycle before its control has been scheduled.
-        for( Node def : n._inputs )
-            if( def!=null && !(def instanceof PhiNode) )
-                _schedEarly(def,code);
-
-        // An existing edge 0 already supplies control (or a Phi/Proj binding).
-        if( n.in(0)==null ) {
-            // Schedule at deepest input
-            CFGNode early = code._start; // Maximally early, lowest idepth
-            for( int i=1; i<n.nIns(); i++ )
-                if( n.in(i)!=null && n.in(i).cfg0().idepth() > early.idepth() )
-                    early = n.in(i).cfg0(); // Latest/deepest input
-            n.setDef(0,early);
-        }
-    }
-
-    // ------------------------------------------------------------------------
-    private static void schedLate( CodeGen code ) {
-        CFGNode[] late = new CFGNode[code.UID()];
-        Node[] ns = new Node[code.UID()];
-        // Record Load NIDs at all their CFG block choices, then check against
-        // Store block choices to force a Load above an anti-dependent Store.
-        int[] anti = new int[code.UID()];
-        Ary<Node> antideps = new Ary<>(Node.class);
-        // Breadth-first scheduling
-        breadth(code._stop,ns,late,anti, antideps);
-
-        // Copy the best placement choice into the control slot
-        for( int i=0; i<late.length; i++ )
-            if( ns[i] != null && !(ns[i] instanceof ProjNode) )
-                ns[i].setDef(0,late[i]);
-    }
-
-    private static void breadth(Node stop, Node[] ns, CFGNode[] late, int[] anti, Ary<Node> antideps) {
-        // Things on the worklist have some (but perhaps not all) uses done.
-        WorkList<Node> work = new WorkList<>();
-        work.push(stop);
-        Node n;
-        outer:
-        while( (n = work.pop()) != null ) {
-            assert late[n._nid]==null; // No double visit
-            // These I know the late schedule of, and need to set early for loops
-            if( n instanceof CFGNode cfg ) late[n._nid] = cfg.blockHead() ? cfg : cfg.cfg(0);
-            else if( n instanceof PhiNode phi ) late[n._nid] = phi.region();
-            else if( n instanceof ProjNode && n.in(0) instanceof CFGNode cfg ) late[n._nid] = cfg;
-            else {
-
-                // All uses done?
-                for( Node use : n._outputs )
-                    if( use!=null && late[use._nid]==null )
-                        continue outer; // Nope, await all uses done
-
-                // Loads need their memory inputs' uses also done
-                if( n instanceof MemOpNode ld && ld._isLoad )
-                    for( Node memuse : ld.antiDeps(antideps) )
-                        if( late[memuse._nid]==null )
-                            continue outer;
-
-                // All uses done, schedule
-                _doSchedLate(n,ns,late,anti,antideps);
-            }
-
-            // A use just finished; reconsider its inputs and waiting loads,
-            // even when the shared memory input was already scheduled.
-            for( Node def : n._inputs ) {
-                if( def==null ) continue;
-                if( late[def._nid]==null ) work.push(def);
-                wakeLoads(def,late,work,new BitSet());
-            }
-            if( n instanceof LoopNode loop )
-                for( Node phi : loop._outputs )
-                    if( phi instanceof PhiNode && late[phi._nid]==null )
-                        work.push(phi);
-        }
-    }
-
-    private static void _doSchedLate(Node n, Node[] ns, CFGNode[] late, int[] anti, Ary<Node> antideps) {
-        // Walk uses, gathering the LCA (Least Common Ancestor) of uses
-        CFGNode early = n.in(0) instanceof CFGNode cfg ? cfg : n.in(0).cfg0();
-        assert early != null;
-        CFGNode lca = null;
-        for( Node use : n._outputs )
-            if( use != null )
-              lca = use_block(n,use, late).domLCA(lca,null);
-
-        // Loads may need anti-dependencies, raising their LCA
-        if( n instanceof MemOpNode load && load._isLoad )
-            lca = find_anti_dep(lca,load,early,late,anti, antideps);
-
-        // Walk up from the LCA to the early, looking for best place.  This is
-        // the lowest execution frequency, approximated by least loop depth and
-        // deepest control flow.
-        CFGNode best = lca;
-        lca = lca.idom();       // Already found best for starting LCA
-        for( ; lca != early.idom(); lca = lca.idom() )
-            if( better(lca,best) )
-                best = lca;
-        assert !(best instanceof IfNode);
-        ns  [n._nid] = n;
-        late[n._nid] = best;
-    }
-
-    // Block of use.  Normally from late[] schedule, except for Phis, which go
-    // to the matching Region input.
-    private static CFGNode use_block(Node n, Node use, CFGNode[] late) {
-        if( use instanceof ParmNode parm )
-            return late[use._nid];
-        if( !(use instanceof PhiNode phi) )
-            return late[use._nid];
-        CFGNode found=null;
-        for( int i=1; i<phi.nIns(); i++ )
-            if( phi.in(i)==n )
-                found = phi.region().cfg(i).domLCA(found,null); // Can be more than one matching input.
-
-        assert found!=null;
-        return found;
-    }
-
-
-    // Least loop depth first, then largest idepth
-    private static boolean better( CFGNode lca, CFGNode best ) {
-        return lca.loopDepth() < best.loopDepth() ||
-            lca instanceof NeverNode ||
-            lca.idepth() > best.idepth() ||
-            best instanceof IfNode;
-    }
-
-    // A writer may consume a load's memory through an aggregate.
-    private static void wakeLoads(Node def, CFGNode[] late, WorkList<Node> work, BitSet visit) {
-        if( visit.get(def._nid) ) return;
-        visit.set(def._nid);
-        for( Node out : def._outputs )
-            if( out instanceof MemOpNode ld && ld._isLoad && late[ld._nid]==null ) work.push(ld);
-        if( def instanceof MemMergeNode )
-            for( int i=1; i<def.nIns(); i++ )
-                if( def.in(i)!=null ) wakeLoads(def.in(i),late,work,visit);
-    }
-
-    private static CFGNode find_anti_dep(CFGNode lca, MemOpNode load, CFGNode early, CFGNode[] late, int[] anti, Ary<Node> antideps) {
-        // We could skip final-field loads here.
-        // Walk LCA->early, flagging Load's block location choices
-        for( CFGNode cfg=lca; cfg!=early.idom(); cfg = cfg.idom() )
-            anti[cfg._nid] = load._nid;
-        // Walk load->mem uses, looking for Stores causing an anti-dep
-        for( Node mem : load.antiDeps(antideps) ) {
-            if( mem instanceof PhiNode phi ) {
-                // Inputs carrying different memory might overwrite this alias.
-                // Raise the LCA for those paths; the unchanged-memory paths
-                // do not clobber the load.  No scheduling edge to the Phi.
-                for( int i=1; i<phi.nIns(); i++ )
-                    if( phi.in(i)!=load.mem() )
-                        lca = anti_dep(load,phi.region().cfg(i),load.mem().cfg0(),lca,null,anti);
-            } else {
-                // Hunt for clobbering stores
-                assert mem instanceof MemOpNode || mem instanceof EscapeNode ||
-                    mem instanceof CallNode || mem instanceof CLInitNode;
-                assert late[mem._nid]!=null;
-                lca = anti_dep(load,late[mem._nid],mem.cfg0(),lca,mem,anti);
-            }
-        }
-        return lca;
-    }
-
-    //
-    private static CFGNode anti_dep( MemOpNode load, CFGNode stblk, CFGNode defblk, CFGNode lca, Node st, int[] anti ) {
-        // A conditional writer can precede the load without dominating its late block.
-        // Walk back to the first overlap with the load's placement range.
-        // A different Phi input need not be dominated by this memory's
-        // definition. Stop at its depth rather than looking for that ancestor.
-        // Retain the sentinel too: a function entry has a null idom.
-        for( ; stblk != defblk.idom() && stblk.idepth() >= defblk.idepth(); stblk = stblk.idom() ) {
-            // Store and Load overlap, need anti-dependence
-            if( anti[stblk._nid]==load._nid ) {
-                lca = stblk.domLCA(lca,null); // Raise Loads LCA
-                if( lca == stblk && st != null && !(st instanceof CallNode) && st._inputs.find(load) == -1 ) // And if something moved,
-                    st.addDef(load);   // Add anti-dep as well (calls already end their block)
-                return lca;            // Cap this stores' anti-dep to here
-            }
-        }
-        return lca;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/IFG.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/IFG.java
deleted file mode 100644
index bcdb14bf..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/IFG.java
+++ /dev/null
@@ -1,580 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.Utils;
-import java.util.BitSet;
-import java.util.IdentityHashMap;
-
-// Interference Graph
-abstract public class IFG {
-    // Interference Graph Support
-
-    // Map from a Basic Block to Live-Out: {a map from a Live Range to a Def}
-    private static final IdentityHashMap<CFGNode,IdentityHashMap<LRG,Node>> BBOUTS = new IdentityHashMap<>();
-    static void resetBBLiveOut() {
-        for( IdentityHashMap<LRG,Node> bbout : BBOUTS.values() )
-            bbout.clear();
-    }
-    static final IdentityHashMap<LRG,Node> TMP = new IdentityHashMap<>();
-
-    // Inteference Graph: Array of Bitsets
-    static final Ary<BitSet> IFG = new Ary<>(BitSet.class);
-    static void resetIFG() {
-        for( BitSet bs : IFG )
-            if( bs!=null ) bs.clear();
-    }
-
-    // Set matching bit
-    private static void addIFG( LRG lrg0, LRG lrg1 ) {
-        short x0 = lrg0._lrg, x1 = lrg1._lrg;
-        // Triangulate
-        if( x0 < x1 ) _addIFG(x0,x1);
-        else          _addIFG(x1,x0);
-    }
-    // Add lrg1 to lrg0's conflict set
-    private static void _addIFG( short x0, short x1 ) {
-        BitSet ifg = IFG.atX(x0);
-        if( ifg==null )
-            IFG.setX(x0,ifg = new BitSet());
-        ifg.set(x1);
-    }
-
-
-    private static final Ary<CFGNode> WORK = new Ary<>(CFGNode.class);
-    static void pushWork(CFGNode bb) {
-        if( WORK.find(bb) == -1 )
-            WORK.push(bb);
-    }
-
-    // ------------------------------------------------------------------------
-    // Visit all blocks, using the live-out LRGs per-block and doing a backwards
-    // walk over each block.  At the end of the walk, push the live-out sets to
-    // prior blocks.  Due to loops, no single visitation order suffices.  This
-    // problem can be fairly efficiently solved with a proper LIVE calculation
-    // and bitsets.  In the interests of simplicity (and assumption of smaller
-    // programs) I am skipping LIVE and directly computing it during the IFG
-    // building.
-
-    // Start by setting the live-out of the exit block (to empty), and putting
-    // it on a worklist.
-
-    // - Pull from worklist a block who's live-out has changed
-    // - Walk backwards, adding interferences and computing live.
-    // - At block head, "push" the new live-out to prior blocks.
-    // - - If they pick up new live-outs, put them on the worklist.
-
-    public static boolean build( int round, RegAlloc alloc ) {
-        // Reset all to empty
-        resetBBLiveOut();
-        resetIFG();
-        WORK.clear();
-
-        // Last block has nothing live out
-        for( CFGNode bb : alloc._code._cfg )
-            if( bb.blockHead())
-                WORK.push( bb );
-
-        // Process blocks until no more changes
-        while( !WORK.isEmpty() )
-            do_block(round,alloc,WORK.pop());
-
-        if( alloc.success() )
-            convert2DAdjacency(alloc);
-        return alloc.success();
-    }
-
-    // Walk one block backwards, compute live-in from live-out, and build IFG
-    static void do_block( int round, RegAlloc alloc, CFGNode bb ) {
-        assert bb.blockHead();
-        IdentityHashMap<LRG,Node> live_out = BBOUTS.get(bb);
-        TMP.clear();
-        if( live_out != null )
-            TMP.putAll(live_out);   // Copy bits to temp
-
-        // A backwards walk over instructions in the basic block
-        for( int inum = bb.nOuts()-1; inum >= 0; inum-- ) {
-            Node n = bb.out(inum);
-            if( n.in(0) != bb ) continue;
-            // In a backwards walk, proj users come before the node itself
-            if( n instanceof MultiNode )
-                for( Node proj : n.outs() )
-                    if( proj instanceof ProjNode )
-                        do_node(alloc,proj);
-            if( n instanceof MachNode )
-                do_node(alloc,n);
-        }
-
-        // The bb head kills register, e.g. a CallEnd and caller-save registers
-        if( bb instanceof MachNode mach )
-            kills(alloc,mach);
-
-        // Push live-sets backwards to priors in CFG.
-        if( bb instanceof RegionNode )
-            for( int i=1; i<bb.nIns(); i++ )
-                mergeLiveOut(alloc,bb,i);
-        else
-            mergeLiveOut(alloc,bb,0);
-    }
-
-    private static void do_node(RegAlloc alloc, Node n) {
-        // Defining means killing live LRG
-        LRG lrg = alloc.lrg(n);
-        if( lrg != null ) {
-            // Check for def-side self-conflict live ranges.  These must split,
-            // and only happens during the first round a particular LRG splits.
-            selfConflict(alloc,n,lrg);
-            TMP.remove(lrg);    // Kill def
-        }
-
-        // Phis use and define the same live range, i.e. these LRGs already
-        // marked conflicted, no need to mark again
-        if( n instanceof PhiNode )
-            return;
-
-        // Kill any killed registers; milli-code routines like New can kill
-        // will not being a CFG.
-        if( n instanceof MachNode m )
-            kills(alloc,m);
-
-        // Interfere n with all live
-        if( lrg!=null ) {
-            // Interfere n with all live
-            for( LRG tlrg : TMP.keySet() ) {
-                assert tlrg.leader();
-                // Skip self
-                if( lrg != tlrg &&
-                    // And register sets overlap
-                    lrg._mask.overlap(tlrg._mask) )
-                    // Then tlrg and lrg interfere.  If lrg needs the single
-                    // last tlrg register at some point, either tlrg or lrg
-                    // must fail.  If *n* (a subset of lrg) needs the single
-                    // last tlrg register then only tlrg must fail.
-                    if( ((MachNode)n).outregmap().size1() ) {
-                        if( !tlrg.clr(lrg._mask.firstReg()) ) // Clear bit, no interference
-                            alloc.fail(tlrg);                 // Clearing drives mask to empty
-                    } else addIFG(lrg,tlrg); // Add interference
-            }
-        }
-
-
-        // Check for self-conflict live ranges.  These must split, and only
-        // happens during the first round when a particular LRG splits.
-        // Also record use-side spills for biased coloring.
-        // Then make all inputs live.
-        for( int i=1; i<n.nIns(); i++ ) {
-            Node def = n.in(i);
-            if( def==null ) continue;
-            LRG lrg1 = alloc.lrg(def);
-            if( lrg1==null ) continue; // Anti-dependence, etc, no register
-
-            // Check use-side for self-conflict; if so we MUST split
-            selfConflict(alloc,def,lrg1);
-
-            // Look for a must-use single register conflicting with some other must-def.
-            if( n instanceof MachNode m ) {
-                RegMask ni_mask = m.regmap(i);
-                if( ni_mask!=null && ni_mask.size1() ) { // Must-use single register
-                    // Search all current live
-                    for( LRG tlrg : TMP.keySet() ) {
-                        assert tlrg.leader();
-                        Node live = TMP.get(tlrg);
-                        if( live != def && live instanceof MachNode lmach && lmach.outregmap().overlap(ni_mask) ) {
-                            // Deny the register, since it absolutely must be used here
-                            if( !tlrg.clr(ni_mask.firstReg()) )
-                                // Then direct reg-reg conflict between use here (at n.in(i)) and def (of tlrg) there.
-                                // Fail the older live range, it must move its register.
-                                alloc.fail( tlrg );
-                        }
-                    }
-                }
-            }
-
-            // All inputs live - except in self conflicts, where we keep the prior def alive
-            // until it goes.
-            TMP.put(lrg1,def);
-        }
-    }
-
-    // Single-register defines *must* have their register; other live ranges
-    // *must* avoid this register, so instead of interfering we remove the
-    // single register from the other rmask.
-    private static void kills( RegAlloc alloc, MachNode m ) {
-        RegMask killMask = m.killmap();
-        if( killMask==null ) return;
-        // Kill registers with all live
-        for( LRG tlrg : TMP.keySet() ) {
-            assert tlrg.leader();
-            // Always, tlrg cannot use kills
-            if( tlrg._mask.overlap(killMask) ) {
-                Node live = TMP.get(tlrg);
-                // Disallow clone-ables from living across killed registers.
-                // Fail them and let splitting re-clone closer to the target use.
-                if( live instanceof MachNode mach && mach.isClone() )
-                    alloc.fail(tlrg);
-                else if( !tlrg.sub(killMask) )
-                    alloc.fail(tlrg);
-            }
-        }
-    }
-
-    // Check for self-conflict live ranges.  These must split, and only happens
-    // during the first round a particular LRG splits.
-    private static void selfConflict(RegAlloc alloc, Node n, LRG lrg) {
-        selfConflict(alloc,n,lrg,TMP.get(lrg));
-    }
-    private static void selfConflict(RegAlloc alloc, Node n, LRG lrg, Node prior) {
-        if( prior!=null && prior != n ) {
-            lrg.selfConflict(prior);
-            lrg.selfConflict(n);
-            alloc.fail(lrg); // 2 unrelated values live at once same live range; self-conflict
-        }
-    }
-
-    // Merge TMP into bb's live-out set; if changes put bb on WORK
-    private static void mergeLiveOut( RegAlloc alloc, CFGNode priorbb, int i ) {
-        CFGNode bb = priorbb.cfg(i);
-        if( bb == null ) return; // Start has no prior
-        while( !bb.blockHead() ) bb = bb.cfg0();
-
-        // Lazy get live-out set for bb
-        IdentityHashMap<LRG, Node> lrgs = BBOUTS.computeIfAbsent( bb, k -> new IdentityHashMap<>() );
-
-        for( LRG lrg : TMP.keySet() ) {
-            Node def = TMP.get(lrg);
-            // Effective def comes from phi input from prior block
-            if( def instanceof PhiNode phi && phi.cfg0()==priorbb ) {
-                assert i!=0;
-                def = phi.in( i );
-            }
-            // The synthetic exit carries no value on this Phi arm.
-            if( def._type==Type.TOP ) continue;
-            Node def_bb = lrgs.get(lrg);
-            if( def_bb==null ) {
-                lrgs.put(lrg,def);
-                pushWork(bb);
-            } else {
-                // Alive twice with different definitions; self-conflict
-                selfConflict(alloc,def,lrg,def_bb);
-            }
-        }
-    }
-
-
-    static void convert2DAdjacency( RegAlloc alloc ) {
-        // Convert the 2-D array of bits (a 1-D array of BitSets) into an
-        // adjacency matrix.
-        int maxlrg = alloc._LRGS.length;
-        for( int i=1; i<maxlrg; i++ ) {
-            BitSet ifg = IFG.atX(i);
-            if( ifg != null ) {
-                LRG lrg0 = alloc._LRGS[i];
-                for( int lrg = ifg.nextSetBit(0); lrg>=0; lrg=ifg.nextSetBit(lrg+1) ) {
-                    LRG lrg1 = alloc._LRGS[lrg];
-                    lrg0.addNeighbor(lrg1);
-                    lrg1.addNeighbor(lrg0);
-                }
-            }
-        }
-    }
-
-
-    // ------------------------------------------------------------------------
-    // Color the inference graph.
-
-    // Coloring works by removing "trivial" live ranges from the IFG - those
-    // live ranges with fewer neighbors than available colors (registers).
-    // These are trivial because even if every neighbor takes a unique color,
-    // there's at least one more available to color this live range.
-
-    // If we hit a clique of non-trivial live ranges, we pick one to be "at
-    // risk" of not-coloring.  Good choices include live ranges with a large
-    // area and few hot uses.
-
-    // Then we reverse and put-back live ranges - picking a color as we go.
-    // If there's no spare color we'll have to spill this at-risk live range.
-
-    public static boolean color(int round, RegAlloc alloc) {
-        int maxlrg = alloc._LRGS.length, nlrgs=0;
-        for( int i=1; i<maxlrg; i++ )
-            if( alloc._LRGS[i] != null )
-                nlrgs++;
-
-        // Simplify
-
-        // Walk all the LRGS looking for some trivial ones to start with.
-        // During this pass all LRGS are broken into 3 disjoint sets:
-        // - trivial, removed from IFG;           color_stack[0 to sptr]
-        // - trivial, not (yet) removed from IFG; color_stack[sptr to swork]
-        // - unknown;                             color_stack[work to maxlrg]
-
-        // Gather all not-unified (not-null); separate trivial and non-trivial set.
-        int sptr = 0, swork = 0;
-        LRG[] color_stack = new LRG[nlrgs];
-        for( int i=0, j=0; i<maxlrg; i++ ) {
-            LRG lrg = alloc._LRGS[i];
-            if( lrg==null ) continue; // Unified lrgs are null here
-            color_stack[j++] = lrg;
-            if( lrg.lowDegree() ) swap(color_stack, swork++, j-1);
-        }
-
-        // Pull all lrgs from IFG, in trivial order if possible
-        while( sptr < color_stack.length ) {
-            // Swap best color up front
-            pickColor(color_stack,sptr,swork,alloc);
-
-            // Pick a trivial lrg, and (temporarily) remove from the IFG.
-            LRG lrg = color_stack[sptr++];
-            // If sptr was swork, then pulled an at-risk lrg
-            if( sptr > swork )
-                swork = sptr;
-
-            // Walk all neighbors and remove
-            if( lrg._adj != null ) {
-                for( LRG nlrg : lrg._adj ) {
-                    // Remove and compress out neighbor
-                    if( nlrg.removeCompress(lrg) ) {
-                        // Neighbor is just exactly going trivial as 'lrg' is removed from IFG
-                        // Find "j" position in the color_stack
-                        int jx = swork;  while( color_stack[jx] != nlrg ) jx++;
-                        // Add trivial neighbor to trivial list.  Pull lrg j out of
-                        // unknown set, since its now in the trivial set
-                        swap(color_stack, swork++, jx);
-                    }
-                }
-            }
-        }
-
-        // Reverse simplify (unstack the color stack), and set colors (registers) for live ranges
-        while( sptr > 0 ) {
-            LRG lrg = color_stack[--sptr];
-            if( lrg==null ) continue;
-            RegMaskRW rmask = lrg._mask.copy();
-            // Walk neighbors and remove adjacent colors
-            if( lrg._adj!=null ) {
-                for( LRG nlrg : lrg._adj ) {
-                    nlrg.reinsert(lrg);
-                    int reg = nlrg._reg;
-                    if( reg!= -1 ) // Failed neighbors do not count
-                        rmask.clr(reg); // Remove neighbor from my choices
-                }
-            }
-            // At-risk live-range did not color?
-            if( rmask.isEmpty() ) {
-                alloc.fail(lrg);
-                lrg._reg = -1;
-            } else {
-                // Pick first available register
-                short reg = rmask.firstReg();
-                // Pick a "good" color from the choices.  Typically, biased-coloring
-                // removes some over-spilling.
-                if( rmask.size() > 1 ) reg = biasColor(alloc,lrg,reg,rmask);
-                lrg._reg = reg; // Assign the register
-            }
-        }
-
-        return alloc.success();
-    }
-
-    // Pick LRG from color stack
-    private static void pickColor(LRG[] color_stack, int sptr, int swork, RegAlloc alloc) {
-        // Out of trivial colorable, pick an at-risk to pull
-        if( sptr==swork )
-            swap(color_stack,sptr,pickRisky(color_stack,sptr,alloc));
-        // When coloring, we'd like to give more choices; so when coloring we'd
-        // like to see the single-def first (since no choices anyway), then
-        // non-split related (so more live ranges get colored), then
-        // split-related last, so they have more colors to bias towards.
-
-        // Working in reverse, pick first split-related with many regs, then
-        // those with some regs, then single-def.
-        int bidx=sptr;
-        LRG best=color_stack[bidx];
-        for( int idx = sptr+1; idx < swork; idx++ )
-            if( betterLRG(best,color_stack[idx]) )
-                best = color_stack[bidx=idx];
-        if( bidx != sptr )
-            swap(color_stack,sptr,bidx); // Pick best at sptr
-    }
-
-    // Returns true if 'lrg' is better than 'best'
-    private static boolean betterLRG( LRG best, LRG lrg ) {
-        // If single-def varies, keep the not-single-def
-        if( best.size1() != lrg.size1() )
-            return best.size1();
-        // If hasSplit varies, keep the hasSplit
-        if( best.hasSplit() != lrg.hasSplit() )
-            return lrg.hasSplit();
-        // If both are single register (so both sizes are 1),
-        // return a multi-use over a multi-def
-        if( best.size1() )
-            return !best._multiUse && lrg._multiUse;
-        // Keep large register count
-        return best.size() < lrg.size();
-    }
-
-    // Pick a live range that hasn't already spilled, or has a single-def-
-    // single-use that are not adjacent.
-    private static int pickRisky( LRG[] color_stack, int sptr, RegAlloc alloc ) {
-        int best=sptr;
-        int bestScore = pickRiskyScore(color_stack[best],alloc);
-        for( int i=sptr+1; i<color_stack.length; i++ ) {
-            if( bestScore == 1000000 ) return best; // Already max score
-            int iScore = pickRiskyScore(color_stack[i],alloc);
-            if( iScore > bestScore )
-                { best = i; bestScore = iScore; }
-        }
-        return best;
-    }
-
-    // Pick a live range to pull, that might not color.
-    //
-    // Picking a live range with a very large span, with defs and uses outside
-    // loops means spilling a relative cheap live range and getting that
-    // register over a large area.
-    //
-    // Picking a live range that is very close to coloring might allow it to
-    // color despite being risky.
-    private static int pickRiskyScore( LRG lrg, RegAlloc alloc ) {
-        // Callee-save live ranges cover the whole function and are cheap to
-        // split.  Rank scheduled area recovered against the loop-scaled cost
-        // of the def- and use-side moves.
-        if( lrg._machDef instanceof CalleeSaveNode )
-            return areaScore(functionArea(lrg._fun,alloc),
-                             splitCost((Node)lrg._machDef,(Node)lrg._machUse));
-        if( lrg._splitDef != null && lrg._splitDef. in(1) instanceof CalleeSaveNode &&
-            lrg._splitUse != null && lrg._splitUse.out(0) instanceof ReturnNode )
-            return areaScore(functionArea(lrg._fun,alloc),
-                             splitCost(lrg._splitDef,lrg._splitUse));
-
-        // Pick single-def clonables that are not right next to their single-use.
-        // Rank by the area recovered by cloning closer to the use.
-        if( !lrg._multiDef && lrg._machDef!=null && lrg._machUse!=null && lrg._machDef.isClone() ) {
-            Node def = ((Node)lrg._machDef);
-            Node use = ((Node)lrg._machUse);
-            CFGNode cfg = def.cfg0();
-            int area = cfg != use.cfg0()
-                ? functionArea(lrg._fun,alloc)
-                : cfg._outputs.find(use)-cfg._outputs.find(def)-1;
-            // A single-use function address can move next to its use without
-            // adding an instruction.  Prefer that to saving a callee-save
-            // register just to hold the address.  Stay in the same block and
-            // require a gap so the clone makes progress.
-            if( def instanceof FunPtrNode && !lrg._multiUse &&
-                cfg == use.cfg0() && area > 0 )
-                return 1000000;
-            if( area > 0 )
-                return areaScore(area,loopCost(use));
-        }
-
-        // Default for ranges without a specific area/cost estimate.
-        return 1000 + (lrg._multiUse ? -100 : 0);
-    }
-
-    private static int functionArea(FunNode fun, RegAlloc alloc) {
-        int area=0;
-        for( CFGNode bb : alloc._code._cfg )
-            if( bb.fun()==fun )
-                area += bb.nOuts();
-        return area;
-    }
-
-    private static int areaScore(int area, int cost) {
-        return 1000 + (area<<10)/cost;
-    }
-
-    private static int splitCost(Node def, Node use) {
-        return loopCost(def) + (use==null ? 0 : loopCost(use));
-    }
-
-    private static int loopCost(Node n) {
-        return 1 << (n.cfg0().loopDepth()*3);
-    }
-
-    private static short biasColor( RegAlloc alloc, LRG lrg, short reg, RegMask mask ) {
-        if( mask.size1() ) return reg;
-        // Check chain of splits up the def-chain.  Take first allocated
-        // register, and if it's available in the mask, take it.
-        Node def = lrg._splitDef, use = lrg._splitUse;
-        int tidx=0, cnt=0;
-
-        while( def != null || use != null ) {
-            if( cnt++ > 10 ) break;
-
-            if( def != null ) {
-                short bias = biasColor( alloc, def, mask );
-                if( bias >= 0 ) return bias; // Good bias
-                if( bias == -2 ) def = null; // Kill this side, no more searching
-                else if( (tidx=biasable(def)) == 0 ) def = null;
-            }
-
-            if( use != null ) {
-                short bias = biasColor( alloc, use, mask );
-                if( bias >= 0 ) return bias; // Good bias
-                if( bias == -2 ) use = null; // Kill this side, no more searching
-                else if( biasable(use)==0 ) use = null;
-            }
-
-            if( def != null ) {
-                short bias = biasColorNeighbors( alloc, def, mask );
-                if( bias >= 0 ) return bias;
-                // Advance def side
-                def = def.in(tidx);
-                if( alloc.lrg(def)==null ) def=null;
-            }
-
-            if( use != null ) {
-                short bias = biasColorNeighbors( alloc, use, mask );
-                if( bias >= 0 ) return bias;
-                use = use.out(0);
-                if( biasable(use)==0 ) use=null;
-            }
-
-        }
-        return mask.firstReg();
-    }
-
-    private static int biasable(Node split) {
-        if( split instanceof SplitNode ) return 1; // Yes biasable, advance is slot 1
-        if( split instanceof PhiNode phi ) return phi.region() instanceof LoopNode ? 2 : 1;   // Prefer the backedge in loops
-        if( !(split instanceof MachNode mach) ) return 0; // Not biasable
-        return mach.twoAddress();                         // Only biasable if 2-addr
-    }
-
-    // 3-way return:
-    // - good bias reg, take it & exit
-    // - this path is cutoff; do not search here anymore
-    // - advance this side
-    private static short biasColor( RegAlloc alloc, Node split, RegMask mask ) {
-        short bias = alloc.lrg(split)._reg;
-        if( bias != -1 ) {
-            if( mask.test(bias) ) return bias; // Good bias
-            else return -2;                    // Kill this side
-        } else return -1;                      // Advance this side
-    }
-
-    // Check if we can match "split" color, or else trim "mask" to colors
-    // "split" might get.
-    private static short biasColorNeighbors( RegAlloc alloc, Node split, RegMask mask ) {
-        LRG slrg = alloc.lrg(split);
-        if( slrg._adj == null ) return -1; // No trimming
-
-        // Can I limit my own choices to valid neighbor choices?
-        for( LRG alrg : slrg._adj ) {
-            short reg = alrg._reg;
-            if( reg == -1 && alrg._mask.size1() )
-                reg = alrg._mask.firstReg();
-            if( reg != -1 ) {
-                mask.clr(reg);
-                if( mask.size1() )
-                    return mask.firstReg();
-            }
-        }
-        return -1;              // No obvious color choice, but mask got trimmed
-    }
-
-    private static void swap( LRG[] ary, int x, int y ) {
-        LRG tmp = ary[x]; ary[x] = ary[y]; ary[y] = tmp;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/InstSelect.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/InstSelect.java
deleted file mode 100644
index db35d524..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/InstSelect.java
+++ /dev/null
@@ -1,126 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import java.util.BitSet;
-import java.util.IdentityHashMap;
-
-// Replace ideal nodes with machine nodes while preserving CFG/loop metadata.
-// Selection also owns target ABI masks and rebuilding the copied graph's uses.
-class InstSelect {
-    private final CodeGen _code;
-    private InstSelect(CodeGen code) { _code=code; }
-
-    static CodeGen select(CodeGen code, String cpu, String callingConv, String base) {
-        // Ideal evaluation schedules the ideal graph without a CPU port.
-        if( cpu==null ) return code;
-        return code.phase(CodeGen.Phase.Select, code._phase==CodeGen.Phase.LoopTree,
-                          () -> new InstSelect(code).run(cpu,callingConv,base));
-    }
-
-    private void run(String cpu, String callingConv, String base) {
-        _code._callingConv = callingConv;
-
-        // Look for CPU in fixed named place:
-        //   com.seaofnodes.simple.node.cpus."cpu"."cpu.class"
-        String clzFile = base+"."+cpu+"."+cpu;
-        try { _code._mach = Class.forName(clzFile).asSubclass(Machine.class).getDeclaredConstructor(CodeGen.class).newInstance(_code); }
-        catch( Exception e ) { throw new RuntimeException(e); }
-
-        _code._cCallingConv = _code._mach.cCallingConv(callingConv);
-
-        // Build global copies of common register masks.
-        long callerSave = _code._mach.callerSave();
-        long cCallerSave= _code._mach.callerSave(_code._cCallingConv);
-        long  neverSave = _code._mach. neverSave();
-        int maxReg = Math.min(64,_code._mach.regs().length);
-        assert maxReg>=64 || (-1L << maxReg & callerSave)==0; // No stack slots in callerSave
-        assert maxReg>=64 || (-1L << maxReg & cCallerSave)==0; // No stack slots in cCallerSave
-        _code._callerSave = new RegMask(callerSave);
-        _code._cCallerSave= new RegMask(cCallerSave);
-
-        // Build a Return RegMask array.  All returns have the following inputs:
-        // 0 - ctrl
-        // 1 - memory
-        // 2 - varies with returning GPR,FPR
-        // 3 - RPC
-        // 4+- Caller save registers
-        _code._retMasks = new RegMask[(maxReg-_code._callerSave.size()-Long.bitCount( neverSave ))+4];
-        for( int reg=0, i=4; reg<maxReg; reg++ )
-            if( !_code._callerSave.test(reg) && ((1L<<reg)&neverSave)==0 )
-                _code._retMasks[i++] = new RegMask(reg);
-        _code._rpcMask = new RegMask(_code._mach.rpc());
-        _code._retMasks[3] = _code._rpcMask;
-
-        // Convert to machine ops
-        _code._uid = 1;               // All new machine nodes reset numbering
-        var map = new IdentityHashMap<Node,Node>();
-        _instSelect( _code._stop, map );
-        _code._stop  = (StopNode)map.get(_code._stop );
-        StartNode start = (StartNode)map.get(_code._start);
-        _code._start = start==null ? new StartNode(_code._start) : start;
-        _instOuts(_code._stop,_code.visit());
-        _code._visit.clear();
-
-        // Replace the CompUnit stop (and list of functions)
-        // with hardware-specific ones
-        for( CompUnit cu : _code._compunits.values() ) {
-            cu._start= (StartCUNode)map.get(cu._start);
-            cu._stop = (StopCUNode )map.get(cu._stop );
-        }
-    }
-
-    private Node _instSelect( Node n, IdentityHashMap<Node,Node> map ) {
-        if( n==null ) return null;
-        Node x = map.get(n);
-        if( x !=null ) return x; // Been there, done that
-
-        // If n is a MachNode already, then its part of a multi-node expansion.
-        // It does not need instruction selection (already selected!)
-        // but it does need its inputs walked.
-        if( n instanceof MachNode ) {
-            for( int i=0; i < n.nIns(); i++ )
-                n._inputs.set(i, _instSelect(n.in(i),map) );
-            return n;
-        }
-
-        // Produce a machine node from n; map it to flag as done so stops cycles.
-        if( n instanceof MemOpNode mem && mem.off() instanceof ExternOffsetNode off ) {
-            // External fields replace base+offset with symbol+0. Keep the ideal
-            // declaring type on the address for machine load/store width selection.
-            TypeMemPtr ptr = (TypeMemPtr)mem.ptr()._type;
-            n._inputs.set(2,new ExternNode(TypeMemPtr.make((byte)2,ptr._obj,true),off._extern));
-            n._inputs.set(3,ConstantNode.raw(TypeInteger.ZERO));
-        }
-        map.put(n, x=_code._mach.instSelect(n) );
-        // Carry loop-tree and pre-order info across the ideal->mach transition
-        if( n instanceof CFGNode ncfg && x instanceof CFGNode xcfg ) {
-            xcfg._ltree = ncfg._ltree;
-            xcfg._pre = ncfg._pre;
-        }
-        // Walk machine op and replace inputs with mapped inputs
-        for( int i=0; i < x.nIns(); i++ )
-            x._inputs.set(i, _instSelect(x.in(i),map) );
-        // Post selection action
-        if( x instanceof MachNode mach ) {
-            if( n instanceof ReturnNode ret )
-                ((ReturnNode)mach)._fun = (FunNode)map.get(ret._fun);
-            mach.postSelect(_code);  // Post selection action
-        }
-
-        return x;
-    }
-
-    private void _instOuts( Node n, BitSet visit ) {
-        if( visit.get(n._nid) ) return;
-        visit.set(n._nid);
-        for( Node in : n._inputs )
-            if( in!=null ) {
-                in._outputs.push(n);
-                // CallNode special: outputs are partially ordered; CallEnd in slot 0
-                if( in instanceof CallNode call && n instanceof CallEndNode cend && call.out(0) != cend )
-                    call._outputs.swap(0,call.nOuts()-1);
-                _instOuts(in,visit);
-            }
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Iter.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Iter.java
deleted file mode 100644
index 1ffd9737..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Iter.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-
-// Establish a pessimistic fixed point after parsing. Later Iter runs
-// reuse the worklist and types produced by the preceding phase.
-abstract class Iter {
-    static void run(CodeGen code) {
-        // Close parser-in-progress states. Seed a fresh pessimistic solve;
-        // exposure sets start at FULL and can only shrink during Iter.
-        code._start.walk(n -> {
-            if( !(n instanceof ConstantNode) )
-                n._type = iterEscapeReset(n._type);
-            code.add(n);
-            return null;
-        });
-        code._iter.iterate(code);
-        // Expensive assert.
-        assert !CodeGen.expensiveAssert() || Opto.fixedPointCheck(code);
-    }
-
-    private static Type iterEscapeReset(Type t) {
-        if( t instanceof TypeMem mem )
-            return mem._one ? mem : mem.makeFrom(XInt.FULL,XInt.FULL);
-        if( t instanceof TypeTuple tt ) {
-            TypeTuple rez = tt;
-            for( int i=0; i<tt._types.length; i++ ) {
-                Type tx = iterEscapeReset(tt._types[i]);
-                if( tx != tt._types[i] ) rez = rez.makeFrom(i,tx);
-            }
-            return rez;
-        }
-        return t;
-    }
-
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/LRG.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/LRG.java
deleted file mode 100644
index fdde8838..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/LRG.java
+++ /dev/null
@@ -1,240 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-import java.util.IdentityHashMap;
-
-/** A Live Range
- * <p>
- *  A live range is a set of nodes and edges which must get the same register.
- *  Live ranges form an interconnected web with almost no limits on their
- *  shape.  Live ranges also gather the set of register constraints from all
- *  their parts.
- * <p>
- *  Most of the fields in this class are for spill heuristics, but there are a
- *  few key ones that define what a LRG is.  LRGs have a unique dense integer
- *  `_lrg` number which names the LRG.  New `_lrg` numbers come from the
- *  `RegAlloc._lrg_num` counter.  LRGs can be unioned together -
- *  (<a href="https://en.wikipedia.org/wiki/Disjoint-set_data_structure">this is the Union-Find algorithm</a>)
- *  - and when this happens the lower numbered `_lrg` wins.  Unioning only
- *  happens during `BuildLRG` and happens because either a `Phi` is forcing all
- *  its inputs and outputs into the same register, or because of a 2-address
- *  instruction.  LRGs have matching `union` and `find` calls, and a set
- *  `_leader` field.
- */
-public class LRG {
-
-    // Dense live range numbers
-    final short _lrg;
-
-    // U-F leader; null if leader
-    LRG _leader;
-
-    // Choosen register
-    short _reg;
-
-    // Count of single-register defs and uses
-    short _1regDefCnt, _1regUseCnt;
-    // Count of all defs, uses.  Mostly interested 1 vs many
-    boolean _multiDef, _multiUse;
-
-    // A sample MachNode def in the live range
-    public MachNode _machDef, _machUse;
-    short _uidx;                // _machUse input
-
-    // Some splits used in biased coloring
-    MachConcreteNode _splitDef, _splitUse;
-
-    // All the self-conflicting defs for this live range
-    IdentityHashMap<Node,String> _selfConflicts;
-
-    // AND of all masks involved; null if none have been applied yet
-    RegMask _mask;
-
-    // Adjacent Live Range neighbors.  Only valid during coloring
-    Ary<LRG> _adj;
-
-    // Function fully containing the live range; used to find the stack frame
-    // layout, for spill op offsets.
-    final public FunNode _fun;
-
-    public int nadj() { return _adj==null ? 0 : _adj._len; }
-
-    public RegMask useMask() { return _machUse==null ? null : _machUse.regmap(_uidx); }
-
-    void addNeighbor(LRG lrg) {
-        if( _adj==null ) _adj = new Ary<>(LRG.class);
-        _adj.push(lrg);
-    }
-
-    // Remove and compress neighbor list; store ex-neighbor past
-    // end for unwinding Simplify.  True if exactly going low-degree
-    boolean removeCompress( LRG lrg ) {
-        _adj.swap(_adj.find(lrg),_adj._len-1);
-        return _adj._len-- == _mask.size();
-    }
-
-    void reinsert( LRG lrg ) {
-        assert _adj._es[_adj._len]==lrg;
-        _adj._len++;
-    }
-
-    // More registers than neighbors
-    boolean lowDegree() { return nadj() < _mask.size(); }
-
-    LRG( short lrg, FunNode fun ) { _lrg = lrg; _reg = -1; _fun = fun; }
-
-    boolean leader() { return _leader == null; }
-
-    // Fast-path Find from the Union-Find algorithm
-    LRG find() {
-        if( _leader==null ) return this; // I am the leader
-        if( _leader._leader==null ) // I point to the leader
-            return _leader;
-        return _rollup();
-    }
-    // Slow-path rollup of U-F
-    private LRG _rollup() {
-        LRG ldr = _leader._leader;
-        // Roll-up
-        while( ldr._leader!=null ) ldr = ldr._leader;
-        LRG l2 = this;
-        while( l2 != ldr ) {
-            LRG l3 = l2._leader;
-            l2._leader = ldr;
-            l2 = l3;
-        }
-        return ldr;
-    }
-
-    // Union `this` and `lrg`, keeping the lower numbered _lrg.
-    // Includes a number of fast-path cutouts.
-    LRG union( LRG lrg ) {
-        assert leader();
-        if( lrg==null ) return this;
-        lrg = lrg.find();
-        if( lrg==this ) return this;
-        return _lrg < lrg._lrg ? _union(lrg) : lrg._union(this);
-    }
-    // Union `this` and `lrg`, folding together all stats.
-    private LRG _union( LRG lrg ) {
-        assert _fun == lrg._fun;
-        // Set U-F leader
-        lrg._leader = this;
-        // Fold together stats
-        if( _machDef==null ) {
-            _machDef = lrg._machDef;
-        } else if( lrg._machDef!=null ) {
-            if( _machDef != lrg._machDef ) _multiDef=true;
-            if( _1regDefCnt==0 )
-                _machDef = lrg._machDef;
-            else if( _machDef==lrg._machDef )
-                _1regDefCnt--;
-        }
-        _1regDefCnt += lrg._1regDefCnt;
-        _multiDef |= lrg._multiDef;
-
-        if( _machUse==null ) {
-            _machUse = lrg._machUse;
-            _uidx = lrg._uidx;
-        } else if( lrg._machUse!=null ) {
-            if( _machUse != lrg._machUse ) _multiUse=true;
-            if( _1regUseCnt==0 ) {
-                _machUse = lrg._machUse;
-                _uidx = lrg._uidx;
-            }
-            else if( _machUse==lrg._machUse )
-                _1regUseCnt--;
-        }
-        _1regUseCnt += lrg._1regUseCnt;
-        _multiUse |= lrg._multiUse;
-
-        // Fold deepest Split
-        _splitDef = deepSplit(_splitDef,lrg._splitDef);
-        _splitUse = deepSplit(_splitUse,lrg._splitUse);
-
-        // Fold together masks
-        RegMask mask = _mask.and(lrg._mask);
-        if( mask==null )
-            mask = _mask.copy().and(lrg._mask);
-        _mask = mask;
-        return this;
-    }
-
-    private static MachConcreteNode deepSplit( MachConcreteNode s0, MachConcreteNode s1 ) {
-        return s0==null || (s1!=null && s0.cfg0().loopDepth() < s1.cfg0().loopDepth()) ? s1 : s0;
-    }
-
-    // Record any Mach def for spilling heuristics
-    LRG machDef( MachNode def, boolean size1 ) {
-        if( _machDef!=null && _machDef!=def )
-            _multiDef = true;
-        if( _machDef==null || size1 )
-            _machDef = def;
-        if( size1 )
-            _1regDefCnt++;
-        if( def instanceof SplitNode split )
-            _splitDef = deepSplit(_splitDef,split);
-        return this;
-    }
-
-    // Record any Mach use for spilling heuristics
-    LRG machUse( MachNode use, short uidx, boolean size1 ) {
-        if( _machUse!=null && _machUse!=use )
-            _multiUse = true;
-        if( _machUse==null || size1 )
-            { _machUse = use; _uidx = uidx; }
-        if( size1 )
-            _1regUseCnt++;
-        if( use instanceof SplitNode split )
-            _splitUse = deepSplit(_splitUse,split);
-        return this;
-    }
-
-    boolean hasSplit() { return _splitDef != null || _splitUse != null; }
-    short size() { return _mask.size(); }
-    boolean size1() { return _mask.size1(); }
-
-
-    void selfConflict( Node def ) {
-        if( _selfConflicts == null ) _selfConflicts = new IdentityHashMap<>();
-        _selfConflicts.put(def,"");
-    }
-
-
-    // Record intersection of all register masks.
-    // True if still has registers
-    boolean and( RegMask mask ) {
-        RegMask mask2 = mask.and(_mask);
-        if( mask2==null )
-            mask2 = _mask.copy().and(mask);
-        _mask = mask2;
-        return !_mask.isEmpty();
-    }
-    // Remove this singular register
-    // True if still has registers
-    boolean clr( int reg ) {
-        if( _mask.clr(reg) ) return true;
-        _mask = _mask.copy();   // Need a mutable copy
-        return _mask.clr(reg);
-    }
-    // Subtract mask (AND complement)
-    // True if still has registers
-    boolean sub( RegMask mask ) {
-        RegMask mask2 = _mask.sub(mask);
-        if( mask2==null )
-            mask2 = _mask.copy().sub(mask);
-        _mask = mask2;
-        return !_mask.isEmpty();
-    }
-
-    @Override public String toString() { return toString(new SB()).toString(); }
-
-    public SB toString( SB sb ) {
-        sb.p("V").p(_lrg);
-        if( _mask!=null ) _mask.toString(sb);
-        return sb;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/LinkMem.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/LinkMem.java
deleted file mode 100644
index 252b5bf0..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/LinkMem.java
+++ /dev/null
@@ -1,33 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.type.TypeStruct;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// In-memory linking
-public class LinkMem {
-    final CodeGen _code;
-    LinkMem( CodeGen code ) { _code = code; }
-
-    public CodeGen link(Encoding enc) {
-        // Patch external calls internally
-        enc.patchGlobalRelocations();
-
-        // Place constant pool after code, static data after constants
-        int code  = 0;                     // Code start
-        int cpool = (enc._bits .size() + code  + 15) & -16;  // pad to 16
-        int sdata = (enc._cpool.size() + cpool + 15) & -16;
-
-
-        // Patch local ops, e.g. loading float constants from the constant pool
-        for( Node op : enc._bigCons.keySet() ) {
-            Encoding.Relo relo = enc._bigCons.get(op);
-            int target = enc._data.address(enc._data.object(relo._t),cpool,sdata);
-            ((RIPRelSize)relo._op).patch(enc, relo._opStart, enc.opLen(relo._op), target - relo._opStart);
-        }
-
-        enc._data.link(cpool,sdata);
-        return _code;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ListScheduler.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ListScheduler.java
deleted file mode 100644
index b6b3a22c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ListScheduler.java
+++ /dev/null
@@ -1,261 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.IterPeeps.WorkList;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.Utils;
-import java.util.*;
-
-public abstract class ListScheduler {
-
-    // eXtra per-node stuff for scheduling.
-    // Nodes are all block-local, and projections fold into their parent.
-    private static final IdentityHashMap<Node,XSched> XS = new IdentityHashMap<>();
-    private static class XSched {
-
-        Node _n;         // Node this extra is for
-        int _bcnt;       // Not-ready not-scheduled inputs
-        int _rcnt;       // Ready not-scheduled inputs
-        boolean _ruse;   // Node IS a "remote use", uses a other-block value
-        boolean _rdef;   // Node IS a "remote def" of a value used in other block
-        boolean _single; // Defines a single register, likely to conflict
-
-        static final Ary<XSched> FREE = new Ary<>(XSched.class);
-        static void alloc(CFGNode bb, Node n) {
-            XSched x = FREE.pop();
-            XS.put(n, (x==null ? new XSched() : x).init(bb,n));
-        }
-        void free() { _n = null; FREE.push(this); }
-
-        static XSched get(Node n) { return n==null ? null : XS.get(n instanceof ProjNode && !(n.in(0) instanceof CFGNode) ? n.in(0) : n); }
-
-        private XSched init(CFGNode bb, Node n) {
-            _n = n;
-            _bcnt = 0;
-            _ruse = _rdef = _single = false;
-
-            // Count block-locals and remote inputs
-            if( !(n instanceof PhiNode) )
-                for( Node def : n._inputs )
-                    if( def != null && def != bb ) {
-                        if( def.cfg0()==bb ) _bcnt++; // Raise block-local input count
-                        else if( !def.isMem() ) _ruse = true; // Remote register user
-                    }
-            // Count remote outputs and allowed registers
-            if( n instanceof MultiNode )
-                for( Node use : n._outputs )
-                    computeSingleRDef(bb,use);
-            else
-                computeSingleRDef(bb,n);
-
-            if( n instanceof NewNode || n instanceof CallNode )
-                bb.fun()._hasCalls = true;
-            return this;
-        }
-
-        private void computeSingleRDef(CFGNode bb, Node n) {
-            // See if this is 2-input, and that input is single-def
-            if( n instanceof MachNode mach && mach.twoAddress() != 0 ) {
-                XSched xs = XS.get(n.in(mach.twoAddress()));
-                if( xs != null )
-                    _single = xs._single;
-            }
-            // Visit all outputs
-            RegMaskRW rmask = !_single && n instanceof MachNode mach && mach.outregmap() != null ? mach.outregmap().copy() : null;
-            for( Node use : n._outputs ) {
-                // Remote use, so this is a remote def
-                if( use!=null && use.cfg0()!=bb ) _rdef = true;
-                // And mask between n's def mask and all n's users masks'
-                if( use instanceof MachNode mach && rmask != null )
-                    for( int i=1; i<use.nIns(); i++ )
-                        if( use.in(i)==n )
-                            rmask.and(mach.regmap(i));
-            }
-            // Defines in a single register
-            _single |= rmask!=null && rmask.size1();
-        }
-
-        // If _bcnt==0, declare ready; move user bcnts into rcnts.
-        boolean isReady() {
-            if( _bcnt > 0 || _rcnt > 0 ) return false;
-            if( _n instanceof MultiNode )
-                for( Node use : _n._outputs )
-                    if( use instanceof ProjNode ) readyUp(use);
-                    // anti-dep from a multireg directly
-                    else _readyUp(use);
-            else
-                readyUp(_n);
-            return true;
-        }
-        private static void readyUp(Node n) {
-            for( Node use : n._outputs )
-                _readyUp(use);
-        }
-        private static void _readyUp(Node use) {
-            XSched xs = get(use);
-            if( xs!=null && !(use instanceof PhiNode) )
-                { assert xs._bcnt>0; xs._bcnt--; xs._rcnt++; }
-        }
-
-        boolean decIsReady() {
-            assert _rcnt > 0;
-            _rcnt--;
-            return isReady();
-        }
-    }
-
-
-    // List schedule every block
-    public static void sched( CodeGen code ) {
-        XS.clear();
-        for( CFGNode bb : code._cfg )
-            if( bb.blockHead() )
-                local(bb,false);
-    }
-
-    // Classic list scheduler
-    private static void local( CFGNode bb, boolean trace ) {
-        assert XS.isEmpty();
-        int len = bb.nOuts();
-
-        // Count block-locals, remote inputs and outputs
-        for( int i=0; i<len; i++ )
-            XSched.alloc(bb,bb.out(i));
-
-        // Nodes are ready if they are not used by other nodes in this block.
-        // Move ready up front.
-        int ready = 0;
-        for( int i=0; i<len; i++ )
-            if( XSched.get(bb.out(i)).isReady() ) // No block-local inputs?
-                bb._outputs.swap(ready++,i);      // Move into ready set
-        assert len==0 || ready > 0;
-
-        // Classic list scheduler.  Behind sched is scheduled.  Between sched
-        // and ready have zero counts and are ready to schedule.  Ahead of
-        // ready is undefined.
-        //
-        // As nodes are scheduled, the nodes they use decrement their bcnts[]. Once
-        // that gets to 0, all the nodes using it are scheduled, so it's ready.
-        int sched = 0;
-        while( sched < len ) {
-            assert sched < ready;
-            int  pick = best(bb._outputs,sched,ready,trace);  // Pick best
-            Node best = bb._outputs.swap(pick,sched++); // Swap best to head of ready and move into the scheduled set
-            // Lower ready count of users, and since projections are ready as
-            // soon as their multi is ready, lower those now too.
-            for( Node use : best._outputs )
-                if( use instanceof ProjNode )
-                    for( Node useuse : use._outputs )
-                        ready = ready(bb,useuse,ready);
-                else
-                    ready = ready(bb,use,ready);
-        }
-
-        // Reset for next block
-        for( XSched x : XS.values() )
-            x.free();
-        XS.clear();
-    }
-
-    private static int ready(CFGNode bb, Node use, int ready) {
-        if( use!=null && use.in(0)==bb && !(use instanceof PhiNode) && XSched.get(use).decIsReady() )
-            bb._outputs.set(ready++, use); // Became ready, move into ready set
-            //bb._outputs.swap(ready++,use);  // Became ready, move into ready set
-        return ready;
-    }
-
-
-    // Pick best between sched and ready.
-    private static int best( Ary<Node> blk, int sched, int ready, boolean trace ) {
-        int pick = sched;
-        Node p = blk.at(pick);
-        int score = score(p);
-        if( trace ) { System.out.printf("%4d N%d ",score,p._nid); System.out.println(p); }
-        for( int i=sched+1; i<ready; i++ ) {
-            Node n = blk.at(i);
-            int nscore = score(n);
-            if( trace ) { System.out.printf("%4d N%d ",nscore,n._nid); System.out.println(n); }
-            if( nscore > score )
-                { score = nscore; pick = i; p = n; }
-        }
-        if( trace ) { System.out.printf("Pick: N%d %s\n\n",p._nid,p); }
-        return pick;
-    }
-
-    // Highest score wins.  Max at 1000, min at 10, except specials.
-    private static final int[] CNT = new int[3];
-    static int score( Node n ) {
-        if( n instanceof  ProjNode     ) return 1001; // Pinned at block entry
-        if( n instanceof CProjNode     ) return 1001; // Pinned at block entry
-        if( n instanceof   PhiNode     ) return 1000;
-        if( n instanceof CFGNode       ) return    1; // Pinned at block exit
-
-        int score = 500;
-        // Ideal nodes ignore register pressure scheduling
-        if( !(n instanceof MachNode) )
-            return score;
-
-        // Register pressure local scheduling: avoid overlapping specialized
-        // registers usages.
-
-        // Subtract 10 (delay) if this op forces a live range to exist that
-        // cannot be resolved immediately; i.e., live count goes up.  Scale to
-        // 20 if multi-def.
-
-        // Subtract 100 if this op forces a single-def live range to exist
-        // which might conflict on the same register with other live ranges.
-        // Defines a single register based on def & uses, and the output is not
-        // ready.  Scale to 200 for multi-def.
-        CNT[1]=CNT[2]=0;
-        XSched xn = XSched.get(n);
-        // If defining a remote value, just generically stall alot.  Value is
-        // used in a later block, can we delay until the end of this block?
-        if( xn._rdef ) score = 200; // If defining a remote value, just generically stall alot
-        boolean flags = false;
-        if( n instanceof MultiNode ) {
-            for( Node use : n._outputs )
-                flags |= singleUseNotReady( use, xn._single );
-        } else
-            flags |= singleUseNotReady( n, xn._single );
-        score +=  -10 * Math.min( CNT[1], 2 );
-        score += -100 * Math.min( CNT[2], 2 );
-        if( flags ) return 10;
-
-        // Add 10 if this op ends a single-def live range, add 20 for 2 or more.
-        // Scale to 100,200 if the single-def is also single-register.
-        CNT[1]=CNT[2]=0;
-        for( int i=1; i<n.nIns(); i++ ) {
-            XSched xd = XSched.get( n.in(i) );
-            if( xd != null && n.in(i).nOuts()==1 )
-                CNT[xd._single || ((MachNode)n).regmap(i)!=null && ((MachNode)n).regmap(i).size1() ? 2 : 1]++;
-        }
-        score +=   10 * Math.min( CNT[1], 2 );
-        score +=  100 * Math.min( CNT[2], 2 );
-
-        // Nothing special
-        assert 10 <= score && score <= 990;
-        return score;
-    }
-
-    // Single use, and that use is not ready to fire once this one does.  If
-    // true, stalling 'n' might reduce 'n's lifetime.  Stall by 1 (2 if single)
-    // per not-ready.
-
-    // If CFG user in this block, it must be last, so definitely stall
-    // single-def (which stalls flags on x86,arm until the jmp).
-    private static boolean singleUseNotReady( Node n, boolean single ) {
-        // If n can rematerialize, assume allocator will split into private uses
-        // as needed.  No impact on local scheduling.
-        if( n.nOuts()>1 && n instanceof MachNode mach && mach.isClone() )
-            return false;
-        for( Node use : n.outs() ) {
-            XSched xu = XSched.get(use);
-            if( xu != null && xu._n instanceof CFGNode ) return true;
-            if( xu != null && xu._bcnt > 0 )
-                CNT[single ? 2 : 1]++; // Since bcnt>0 or CFG, stall until user is more ready
-        }
-        return false;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/LocalIds.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/LocalIds.java
deleted file mode 100644
index 462248dd..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/LocalIds.java
+++ /dev/null
@@ -1,33 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import java.util.HashMap;
-import java.util.Arrays;
-
-// Dense IDs for this invocation. A class slot can be reserved before its file
-// is parsed; every later reference to that slot gets the same ID.
-public class LocalIds {
-    public static final int RESERVED=2;
-    private int _next=RESERVED;
-    private final com.seaofnodes.simple.util.Ary<String> _owners=new com.seaofnodes.simple.util.Ary<>(String.class);
-    private final HashMap<String,int[]> _slots=new HashMap<>();
-
-    public int next(String owner) { return next(owner,-1); }
-    public int next(String owner, int slot) {
-        int[] ids=_slots.get(owner);
-        if( ids==null ) ids=new int[]{RESERVED,1};
-        if( slot==-1 ) slot=ids[0]++;
-        else if( slot>=ids[0] ) ids[0]=slot+1;
-        if( slot>=ids.length ) ids=Arrays.copyOf(ids,Math.max(slot+1,ids.length*2));
-        if( ids[slot]==0 ) { ids[slot]=_next++; _owners.setX(ids[slot],owner); }
-        _slots.put(owner,ids);
-        return ids[slot];
-    }
-    public String owner(int id) { return _owners.atX(id); }
-    public String symbol(int id) { return owner(id)+".$fun"+id; }
-    public int nextInline() { return _next++; }
-    public int next(int old) {
-        int id=_next++;
-        _owners.setX(id,owner(old));
-        return id;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Machine.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Machine.java
deleted file mode 100644
index 3eee8fc3..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Machine.java
+++ /dev/null
@@ -1,127 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeFunPtr;
-import com.seaofnodes.simple.type.TypeInteger;
-
-abstract public class Machine {
-    // Human readable machine name.  Something like "x86-64" or "arm" or "risc5"
-    public abstract String name();
-
-    // Default opcode size for printing; 4 bytes for most 32-bit risc chips
-    public int defaultOpSize() { return 4; }
-
-    // Human-readable name for a register number, e.g. "RAX" or "R0"
-    public abstract String[] regs();
-
-    // Create a split op; any register to any register, including stack slots.
-    // The FunNode holds the stack layout after RegAlloc, which in turn
-    // dictates the stack slot (the frame offset) for stack splits.
-    public abstract SplitNode split( LRG lrg, String kind, byte round );
-
-    // List of caller-save registers, as a 64bit mask
-    public abstract long callerSave();
-    public long callerSave(String conv) { return callerSave(); }
-
-    // List of never-save registers, e.g. RSP or a ZERO register if you have one
-    public abstract long neverSave();
-
-    // Call Argument Mask.  Passed in the function signature and argument
-    // number (2-based; 0 is for control and 1 for memory).  Also passed in a 0
-    // for the function itself, or for *outgoing* calls, the maximum stack slot
-    // given to the incoming function arguments (stack slots reserved for
-    // incoming arguments).
-    public abstract RegMask callArgMask(TypeFunPtr tfp, int arg, int maxArgSlot);
-    public RegMask callArgMask(TypeFunPtr tfp, int arg, int maxArgSlot, String conv) { return callArgMask(tfp,arg,maxArgSlot); }
-
-    // Return register mask, based on signature (GPR vs FPR)
-    public abstract RegMask retMask(TypeFunPtr tfp);
-
-    // Return PC register
-    public abstract int rpc();
-
-    // Return a MachNode unconditional branch
-    public abstract CFGNode jump();
-
-    // Instruction select from ideal nodes
-    public abstract Node instSelect( Node n );
-
-    /** Stack Slot Numbering
-
-RA gives all registers a number, starting at 0.  Stack slots continue this
-numbering going up from the last register number.  Common register numbers are
-0-15 for GPRs, 16-31 for FPRs, 32 for flags, and stack slots starting at
-register#33 going up.  These numbers are machine-specific, YMMV, etc; e.g. RPC
-is only in stack slot 0 on X86; other cpus start with the rpc in a register
-which may spill into any generic spill slot.
-
-For ease of reading and printing, stack slots start again at slot#0 - but
-during RA they are actually biased by CPU.MAX_REG.
-
-Stack Layout during Reg Alloc:
-
-         Slot  Value    Description
-        ----  -------  -----------
-MAXREG+ R+1   argR     maxArgSlot(calleR tfp), can be 0
-        ...
-MAXREG+ 1     arg0
-        ----  -- Caller ------
-MAXREG+ 0     RPC
-MAXREG+ R+E+N PAD      optional alignment
-
-MAXREG+  +    Spills   Caller Frame Space; N spills
-MAXREG+ R+E+1 Spills
-
-MAXREG+ R+E   argE     maxArgSlot(calleE tfp), can be 0
-        ...
-MAXREG+ R+2   arg0
-        ----  -- Callee -------
-        ...
-
-Slots defined by maxArgSlot do not have to contain the actual passed argument;
-they can be "shadow slots".  If they exist, they are property of the frame /
-FunNode where the TFP comes from.
-
-For a given calleR, there are generally many calleE's and they all share the
-low-range stack slots.
-
-Example:, Win64, main(int arg) { calloc(1,size); }
-
-                           Post-Warp: SP+56   shadow-main-arg
-Pre-alloc               Post-Alloc    SP+48   RPC
---- -------             ----------    -------------
-40  spill#3             SP+40         SP+40   spill#3
-39  spill#2             SP+32          ""
-38  spill#1             SP+24          ""
-37  spill#0             SP+16          ""     spill#0
-36  shadow-calloc#size  SP+ 8         SP+ 8   shadow-calloc#size
-35  shadow-calloc#1     SP+ 0         SP+ 0   shadow-calloc#1
---- --- FRAME BASE ----------         ---- FRAME BASE -------
-34  shadow-main-arg     SP+56
-33  RPC                 SP+48
-
-
-    */
-
-
-    // Maximum stack slot (or 0) for the args in this TFP.  This will include
-    // shadow slots if defined in the ABI, even if all arguments are passed in
-    // registers.
-    public abstract short maxArgSlot(TypeFunPtr tfp);
-    public short maxArgSlot(TypeFunPtr tfp, String conv) { return maxArgSlot(tfp); }
-
-    // Calling convention used for external C symbols.
-    public String cCallingConv(String callingConv) { return callingConv; }
-
-    // Only the declared C result width describes the physical return register.
-    // Simple functions already return canonical full-width integer values.
-    protected static TypeInteger cReturn(ProjNode prj) {
-        if( prj._idx==2 && prj.in(0) instanceof CallEndNode cend &&
-            cend.call().fptr()._type instanceof TypeFunPtr tfp && tfp.isConstant() &&
-            CodeGen.CODE.externFunc(tfp.fidx())!=null &&
-            tfp.ret() instanceof TypeInteger ret && ret.log_size()<3 )
-            return ret;
-        return null;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Opto.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Opto.java
deleted file mode 100644
index 4db277df..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/Opto.java
+++ /dev/null
@@ -1,317 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Ary;
-
-import java.util.BitSet;
-
-// Optimistic Algorithm
-abstract public class Opto {
-
-    // Optimistic analysis - extended SCCP
-
-    // Start all Types at TOP, and propagate changes until stable.  Unlike a
-    // normal Sparse Conditional Constant Propagation, this version is
-    // interprocedural, computing effectively CFA0 in linear time using the
-    // normal SCCP algorithm.
-
-    // This algo also builds a Call Graph; as Calls become reachable (CONTROL
-    // not TOP nor XCONTROL), they "link" against the reaching function
-    // pointers - adding edges from the Call to the Fun, and from the Return to
-    // the CallEnd.  This allows the normal algorithm to use the normal edge
-    // propagation rules as function argument types stabilize.  In the end, we
-    // get a fairly precise set of Call Graph edges between CallNodes and
-    // FunNodes.
-    public static void opto(CodeGen code) {
-        // Reset Types before running the worklist algorithm
-        Ary<Type> oldTypes = new Ary<>(Type.class); // Used for asserts only
-        resetToTop(code,oldTypes);
-        unlinkStart(code);
-
-        // OPTIMISTIC INTERPROCEDURAL SCCP
-        sccp(code, oldTypes);
-
-        // SCCP can leave a recursive numeric component at BOTTOM with no
-        // arithmetic mode selected.  Resolve the whole component from all
-        // available int/float evidence before IterPeeps consumes the types.
-        resolveNumericModes(code);
-
-        if( !code._iter._work.isEmpty() )
-            sccp(code, oldTypes);
-
-        // After SCCP add everything changed to the worklist and see if
-        // peepholes can make more progress.
-        moveChangesToWorklist(code, oldTypes);
-    }
-
-    // Reset Types before running the worklist algorithm
-    private static void resetToTop(CodeGen code, Ary<Type> oldTypes ) {
-        code._start.walk( x -> {
-                oldTypes.setX(x._nid,x._type); // Record original types for asserts
-                x._type = Type.TOP;            // Reset all Nodes to TOP
-                code._iter.add(x); // Visit everybody at least once; most Nodes produce better than TOP
-                return null;
-            } );
-    }
-
-
-    // If wholeWorld, remove the Start inputs to functions - they are not
-    // called unless they get linked (hence go dead and can be removed).  If
-    // not wholeWorld, keep only public methods (and not the std lib).
-    private static void unlinkStart(CodeGen code) {
-        // Keep the Start & Start.ProjMem alive even as we remove all uses
-        for( CompUnit cu : code._compunits.values() ) {
-            ProjNode mem = cu._start.proj(1);
-            if( mem!=null ) mem.keep();
-        }
-
-        // Iterate the Stop-of-Stops
-        for( Node stop : code._stop._inputs ) {
-            for( int i=0; i<stop.nIns(); i++ ) {
-                ReturnNode ret = (ReturnNode)stop.in(i);
-                FunNode fun = ret.fun();
-                // Start is a semantic unknown-caller edge.  Public functions
-                // keep it; closed-world functions must be reached by a
-                // concrete Call edge discovered during SCCP. Initializers,
-                // including private ones, are called by opaque CLInit
-                // obligations whose Call edges are introduced only in Lower.
-                if( !fun.isClz() &&
-                    !code.publicFIDX(fun.sig().fidx()) &&
-                    fun.in(1) instanceof StartNode ) {
-                    fun.removeDeadPath(1);
-                    // Unhook from Stop without treating the ReturnNode as
-                    // DEAD.  It stays in limbo until Opto links when a caller
-                    // is discovered (or not, and the function is really dead).
-                    stop._inputs.del(i--);
-                    ret.delUse(stop);
-                }
-                // Unlink the existing conservative call linkages.
-                for( int j=1; j<fun.nIns(); j++ )
-                    if( fun.in(j) instanceof CallNode call )
-                        call.unlink(fun,j--);
-            }
-        }
-    }
-
-    // As part of building a CallGraph, when opto finds a function ptr flowing
-    // into a Call, link the Call and Fun.
-    private static void linkCG(CodeGen code, TypeFunPtr tfp, CallNode call) {
-        if( tfp.nargs() != call.nargs() ) return; // Error calls hit this
-        int[] fidxs = tfp.fidxs();
-        // An unresolved forward call can still carry the infinite, inferred
-        // function set into Opto.  There is no finite call graph to link yet;
-        // type checking will report the unresolved reference afterwards.  This
-        // can yet be valid if the call is eventually dead.
-        //   `if( false ) frefCall(args);`
-        if( XInt.isHigh(fidxs) ) return;
-        for( int fidx = XInt.next(fidxs,0); fidx >=0; fidx = XInt.next(fidxs,fidx) ) {
-            // unlinkStart deliberately leaves uncalled functions in a
-            // temporarily dead limbo.  A newly discovered call revives them;
-            // do not use the cleanup lookup which removes dead linker entries.
-            FunNode fun = code._link(fidx);
-            // null here means an external function; i.e. this Call
-            // calls to an outside library and all its arguments escape.
-            if( fun != null && !call.linked(fun) ) {
-                call.link( fun );
-                code._iter.add(fun);
-                code._iter.addAll(fun._outputs);
-            }
-        }
-    }
-
-    // Start added some FIDXs, the same functions now can be reached from start
-    // and called by anybody.  Add the CG edges.
-    private static void linkStart( CodeGen code, TypeTuple tt  ) {
-        TypeMem tmem = (TypeMem)tt._types[1];
-        int[] fidxs = tmem._escFs;
-        if( XInt.isHigh(fidxs) ) {
-            // A scalar BOTTOM can flow into memory while compiling an error
-            // program.  It exposes all public functions, not private fields.
-            for( FunNode fun : code._linker )
-                if( fun != null && code.publicFIDX(fun.sig().fidx()) )
-                    linkStart(code,fun);
-            return;
-        }
-        for( int fidx = XInt.next(fidxs,0); fidx >=0; fidx = XInt.next(fidxs,fidx) ) {
-            FunNode fun = code._linker.atX(fidx);
-            if( fun==null )  assert code._externFunc.containsKey(fidx);
-            else             linkStart(code,fun);
-        }
-    }
-
-    // Function is now reachable by unknown callers through Start.  The
-    // default inputs must therefore use conservative declared types.
-    private static void linkStart( CodeGen code, FunNode fun ) {
-        assert !fun.isDead();
-        StartCUNode start = fun._compunit._start;
-        if( !fun.unknownCallers() ) {
-            assert !start.isDead();
-            code.keepInCompUnit(fun);
-            // Function is reachable by any *remote* caller who gets the pointer!
-            fun.insertDef(1,start);
-            code._iter.add(fun);
-            for( Node p : fun._outputs )
-                if( p instanceof ParmNode parm ) {
-                    Node defalt = parm._idx==1 ? start.proj(1) : ConstantNode.seed(parm._declaredType).peephole();
-                    parm.insertDef(1,defalt);
-                    code.add(parm);
-                }
-        }
-    }
-
-
-    // The core SCCP algorithm
-    private static void sccp( CodeGen code, Ary<Type> oldTypes ) {
-        // Iter workList is empty at this point
-        // OPTIMISTIC PASS
-        Node n;
-        int count = 0;          // Debug counter
-        while( (n = code._iter._work.pop()) != null ) {
-            if( n.isDead() ) continue;
-            count++;
-            Type oval = n._type, nval = n.compute();
-            if( oval == nval ) continue;
-            assert oval.isa(nval) : "Non-monotonic SCCP: "+n.getClass().getSimpleName()+"#"+n._nid+" "+n+" old="+oval+" new="+nval;    // Types start high and always fall
-            Type pesiVal = oldTypes.atX(n._nid);
-            assert pesiVal==null || nval.isa(pesiVal) : "SCCP below pessimistic type: "+n.getClass().getSimpleName()+"#"+n._nid+" "+n+" pessimistic="+pesiVal+" new="+nval; // Never fall worse than the pessimistic pass
-            n._type = nval;
-
-            // Now we have a series of stanzas where we lazily create the Call
-            // Graph - adding graph edges between every call site and called
-            // function, including external (unknown) callers.  These edges are
-            // not in from the start because they are *too many*; we would get
-            // O(n^2) edges.  So all along we have been treating them as
-            // "virtual" CFG edges - a FunNode taking a Start input is treated
-            // as if every call on the planet might call it.  Now we make these
-            // CG edges *concrete*, adding them back as we discover that a call
-            // calls a particular function.
-
-            // If a TFP adds a new function input to a call, link to the new
-            // Fun.  This adds new edges to the graph allowing argument values
-            // to flow from calls into functions.  The added edges are
-            // effectively a refined Call Graph.
-            if( nval instanceof TypeFunPtr tfp ) {
-                for( Node use : n._outputs )
-                    if( !use._type.isHigh() && use instanceof CallNode call && call.fptr() == n )
-                        linkCG(code,tfp,call);
-            }
-
-            // Link a Call which becomes alive.  Like above, adds new Call
-            // Graph edges to the graph.
-            if( n instanceof CallNode call && nval == Type.CONTROL && call.fptr()._type instanceof TypeFunPtr )
-                linkCG(code,call.tfp(),call);
-
-            // If an otherwise-dead function pointer escapes, any future linked
-            // caller might find and call it.  Force the function to be alive
-            // and called by Start.
-            if( n instanceof StartNode )
-                linkStart(code,(TypeTuple)n._type);
-
-            // Since n._type changed, visit all output neighbors
-            code._iter.addAll(n._outputs);
-            n.moveDepsToWorklist(code._iter);
-            // Quadratic (expensive) small-step assert.
-            assert !CodeGen.expensiveAssert(count) || worklistCheck(code);
-        }
-    }
-
-    // Quadratic (expensive) fixed-point assert
-    public static boolean fixedPointCheck(CodeGen code) {
-        return fixedPointCheck(code,code._stop);
-    }
-    public static boolean fixedPointCheck(CodeGen code, Node root) {
-        root.walk( x -> {
-                Type xval = x.compute();
-                assert xval == x._type;
-                return null;
-            });
-        return true;
-    }
-
-    // Quadratic (expensive) small-step assert for SCCP, where changed nodes
-    // may already be on the worklist.
-    private static boolean worklistCheck(CodeGen code) {
-        code._midAssert = true;
-        Node root = code._start;
-        root.walk( x -> {
-                Type xval = x.compute();
-                assert xval == x._type || (x._type.isa( xval ) && code._iter._work.on( x ))
-                    : "Non-monotonic or missed SCCP work: "+x.getClass().getSimpleName()+"#"+x._nid+" "+x+" old="+x._type+" new="+xval;
-            return null;
-            });
-        code._midAssert = false;
-        return true;
-    }
-
-    // After SCCP add everything changed to the worklist and see if peepholes
-    // can make more progress.
-    private static void moveChangesToWorklist(CodeGen code, Ary<Type> oldTypes) {
-        code._start.walk( x -> {
-                assert x.compute() == x._type;      // Hit the fixed point
-                assert x._nid >= oldTypes._len || x._type.isa(oldTypes.at(x._nid)); // Hit at least the bottom-up type
-                code.add(x);
-                return null;
-            });
-    }
-
-    // Resolve arithmetic modes which are ambiguous only because they belong to
-    // a recursive component.  Float wins because integer operands can be
-    // converted to float.
-    private static void resolveNumericModes(CodeGen code) {
-        final BitSet visited = new BitSet();
-        code._stop.walk(n -> {
-            if( n instanceof ModeNode modeNode && modeNode.mode()==0 ) {
-                visited.clear();
-                visited.set(n._nid); // Inspect inputs, not Bool's integer result
-                int mode = 0;
-                for( int i=1; i<n.nIns(); i++ )
-                    mode |= numericEvidence(n.in(i),visited);
-                // A closed recursive numeric component can have no remaining
-                // concrete evidence after SCCP, e.g. dead all-integer loops.
-                // With no float evidence, settle to integer.
-                if( mode == 0 )
-                    mode = 1;
-                if( mode != 0 )  {
-                    // If both evidence, FP wins
-                    modeNode.setMode((byte)((mode&2)==2 ? 2 : 1));
-                    code.add(n);
-                    code.addAll(n.outs());
-                }
-            }
-            return null;
-        });
-    }
-
-    // Gather numeric evidence through Phi and interprocedural return cycles.
-    // The visited set makes self- and mutually-recursive calls finite.
-    private static int numericEvidence(Node n, BitSet visited) {
-        if( n == null ) return 0;
-        if( visited.get(n._nid) ) return 0;
-        visited.set(n._nid);
-
-        Type t = n._type;
-        if( t instanceof TypeFloat   ) return 2;
-        if( t instanceof TypeInteger ) return 1;
-        if( t!=Type.BOTTOM && !(t instanceof TypeTuple) )
-            return 0; // Something unrelated, like a ptr
-
-        int evidence = 0;
-        assert !(n instanceof ConvertNode); // No test case
-        switch( n ) {
-        case ModeNode modeNode when modeNode.mode() != 0 -> { return modeNode.mode(); }
-        case ModeNode modeNode -> {}
-        case PhiNode phi -> {}
-        case ReturnNode ret -> {}
-        case ProjNode proj when proj.in(0) instanceof CallEndNode cend -> {
-            for( int i=1; i<cend.nIns(); i++ )
-                evidence |= numericEvidence(cend.in(i),visited);
-        }
-        default -> { return 0; }
-        }
-        for( int i=1; i<n.nIns(); i++ )
-            evidence |= numericEvidence(n.in(i),visited);
-
-        return evidence;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ParseAll.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ParseAll.java
deleted file mode 100644
index 171d9923..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/ParseAll.java
+++ /dev/null
@@ -1,285 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.IterPeeps;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.print.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.*;
-import java.io.File;
-import java.io.IOException;
-import java.util.*;
-
-// Parse a given file, and all its dependencies
-public abstract class ParseAll {
-
-    static void parse(CodeGen code, String src) {
-        Parser.TYPES.clear();
-        Parser.TYPES.putAll(Parser.INIT_TYPES);
-        if( src != null ) {
-            // No source file, just the source itself.
-            parseSource(code,code._srcName==null ? "Test" : code._srcName,src);
-        } else {
-            // Path from module root to source file
-            parsePath(code,code._srcName);
-        }
-    }
-
-    // Worklist of symbols to search and files to parse
-    private static final Ary<CompUnit> WORK = new Ary<>(CompUnit.class);
-
-
-    // Return a compilation unit (cached or new).  If new, it does not necessarily
-    // need to be compiled.
-    public static CompUnit makeCUnit( CodeGen code, CompUnit par, String name ) throws IOException {
-        int idx=name.indexOf('/');
-        if( idx>=0 ) return makeCUnit(code,makeCUnit(code,par,name.substring(0,idx)),name.substring(idx+1));
-        String fname=par==null ? name : par._fname+"/"+name;
-        CompUnit cu=code._compunits.get(fname);
-        if( cu==null ) {
-            String cname=par==null ? name : par._cname+"."+name;
-            code._compunits.put(fname,cu=new CompUnit(par,fname,cname,name));
-        }
-        return cu;
-    }
-
-
-    // Parse a top-level string, used for e.g. testing
-    static void parseSource( CodeGen code, String src ) {
-        parseSource(code,"Test",src);
-    }
-
-    // Parse a top-level string with an explicit compilation-unit name.
-    static void parseSource( CodeGen code, String fname, String src ) {
-        CompUnit cunit = new CompUnit(fname,src);
-        code._compunits.put(cunit._fname,cunit);
-        parseAll(code,cunit);
-    }
-
-    // module_root/.../src.smp is source file name.
-    static void parsePath(CodeGen code, String fname) {
-        try {
-            // Split and build the parent-path down to the source file.
-            CompUnit cu = makeCUnit( code, null, fname );
-            // Compile this CompUnit
-            parseAll(code,cu);
-        } catch( IOException ioe ) {
-            throw new RuntimeException(ioe);
-        }
-    }
-
-    private static void enqueue(CompUnit cu) {
-        if( cu._par!=null ) enqueue(cu._par);
-        if( cu._start==null && WORK.find(cu)==-1 ) WORK.add(cu);
-    }
-
-    private static void parseAll(CodeGen code, CompUnit cunit) {
-        WORK.clear();           // Cleanup from prior tests
-        // Prime the pump with the first CompUnit
-        enqueue(cunit);
-        // Work through all unparsed compilation units and parse
-        while( !WORK.isEmpty() ) {
-            CompUnit cu = WORK.remove(0);
-            if( cu._src==null )
-                throw new RuntimeException("Missing source file '"+cu._fname+".smp'");
-            parseOne(code,cu);
-        }
-
-        // Many types will have been declared cyclically either internally or
-        // across multiple compilation units.
-
-        // Close over all recursive types, and upgrade TYPES
-        Ary<TypeStruct> ary = new Ary<>(TypeStruct.class);
-        for( Type t : Parser.TYPES.values() )
-            if( t instanceof TypeStruct ts )
-                ary.add(ts);
-        TypeStruct[] tss = Type.closeOver(ary.asAry(),Parser.TYPES);
-        for( TypeStruct ts : tss )
-            Parser.TYPES.put(ts._name,ts);
-        for( CompUnit cu : code._compunits.values() )
-            cu._clz = (TypeStruct)Parser.TYPES.get(Parser.addClzPrefix(cu._cname));
-
-        // Walk over all Nodes, and upgrade the internal constants to the
-        // closed-over types.
-        code._stop.walk( (Node n) -> {
-                n.upgradeType(Parser.TYPES);
-                if( n instanceof FRefNode fref ) {
-                    boolean alloc = fref._name.endsWith(".<new>");
-                    String clzName = alloc
-                        ? fref._name.substring(0,fref._name.length()-".<new>".length()).intern()
-                        : fref._name;
-                    TypeStruct clz = (TypeStruct)Parser.TYPES.get(clzName);
-                    if( clz == null )
-                        return null;
-                    Node con;
-                    if( alloc ) {
-                        Field ctor = clz.field("<new>");
-                        if( ctor == null || !(ctor._t instanceof TypeFunPtr tfp) ) {
-                            String name = clzName.startsWith(Parser.CLZ)
-                                ? clzName.substring(Parser.CLZ.length()) : clzName;
-                            int dot = name.lastIndexOf('.');
-                            throw Parser.error("Unknown struct type '"+(dot==-1 ? name : name.substring(dot+1))+"'",fref._loc);
-                        }
-                        FunNode fun = code.link(tfp);
-                        if( fun == null ) return null;
-                        con = new FunPtrNode(tfp,code._start,fun.ret()).peephole();
-                    } else {
-                        // Class pointer constant:
-                        TypeMemPtr clzptr = TypeMemPtr.make((byte)2,clz,true);
-                        con = code.con(clzptr);
-                    }
-                    // Replace and optimize
-                    fref.addDef(con);
-                    code.add(fref);
-                }
-                // Adds sort by NIDs, which just got shuffled
-                if( n instanceof AddNode add )
-                    code.add(add);
-                return null;
-            } );
-
-        // The complete public interface is now known.  Keep this independent
-        // of later graph/linker liveness so SCCP computations remain local and
-        // monotonic.
-        code.freezePublicInterface();
-    }
-
-    // Parse one Simple source code file.  Add all the FRefs produced to the worklist.
-    private static void parseOne( CodeGen code, CompUnit cunit ) {
-        cunit.setStart(code);
-        // Parse a source file, return missing external references
-        Ary<FRefNode> frefs = code.P.parse(cunit);
-
-        // Find all missing external references, or complain.  This can trigger more parses.
-        while( !frefs.isEmpty() ) {
-            FRefNode fref = frefs.remove(0);
-            // Symbol not found in source code (or we would not be here).
-            // Search the module for the fref
-            try {
-                CompUnit xcunit = findCUnitModule(code,cunit,fref._name);
-                if( xcunit != null ) {
-                    // Replace the FRef with the discovered class name.
-                    fref._name = Parser.addClzPrefix(xcunit._cname);
-                    cunit.addDep(xcunit);
-                } else {
-                    throw new RuntimeException("Undefined name '" + fref._name +"'");
-                }
-            } catch( IOException ioe ) {
-                throw new RuntimeException(ioe);
-            }
-        }
-        addRequiredTypes(code,cunit);
-    }
-
-    private static void addRequiredTypes(CodeGen code, CompUnit cunit) {
-        LinkedHashSet<String> required = new LinkedHashSet<>();
-        code._stop.walk(n -> {
-            TypeStruct ts = CodeGen.requiredStruct(n);
-            if( ts!=null && ts._fref ) required.add(ts._name);
-            return null;
-        });
-        for( String typeName : required ) {
-            try {
-                CompUnit xcunit = findRequiredType(code,cunit,typeName);
-                if( xcunit != null )
-                    cunit.addDep(xcunit);
-                else
-                    assert false : "expected to find required type";
-            } catch( IOException ioe ) {
-                throw new RuntimeException(ioe);
-            }
-        }
-    }
-
-    private static CompUnit findRequiredType(CodeGen code, CompUnit cunit, String typeName) throws IOException {
-        for( CompUnit cu = cunit; cu != null; cu = cu._par ) {
-            String symbol = typeName.startsWith(cu._cname+".")
-                ? typeName.substring(cu._cname.length()+1)
-                : typeName;
-            CompUnit xcunit = findCUnitModule(code,cu,symbol);
-            if( xcunit != null )
-                return xcunit;
-        }
-        return null;
-    }
-
-
-    // Symbol not found in source code (or we would not be here).
-    // Search the module for the fref
-    public static CompUnit findCompUnitOrThrow(CodeGen code, CompUnit cu, String symbol) {
-        CompUnit cu2 =  findCompUnit(code,cu,symbol);
-        if( cu2 != null ) return cu2;
-        throw new RuntimeException("Undefined name '" + symbol +"'");
-    }
-
-    public static CompUnit findCompUnit(CodeGen code, CompUnit cu, String symbol) {
-        // Symbol not found in source code (or we would not be here).
-        // Search the module for the fref
-        try {
-            CompUnit local = findCUnitModule(code,cu,symbol);
-            if( local != null )
-                return local;
-            return null;
-        } catch( IOException ioe ) {
-            throw new RuntimeException(ioe);
-        }
-    }
-
-    // Find the symbol in module, starting from cunit.  This searches up the nested
-    // class chain and sideways 1 step, so that any prefix of the class chain can
-    // be skipped as a shortcut.  Symbol can have dotted names, which then go
-    // down into classes.  e.g.
-    //   A/X/Y exists.
-    //   A/B contains X.Y, which is a shortcut for A.X.Y
-
-    // However if A/B contains "Y", the search would be for A.B.Y then A.Y both of
-    // which do not exist.
-    private static CompUnit findCUnitModule( CodeGen code, CompUnit cunit, String symbol ) throws IOException {
-        if( cunit == null ) {
-            if( !symbol.equals("sys") || !CompUnit.source("sys").exists() ) return null;
-            CompUnit sys=makeCUnit(code,null,"sys");
-            enqueue(sys);
-            return sys;
-        }
-
-        // Check self
-        if( cunit._name.equals(symbol) )
-            return cunit;
-
-        // If symbol is itself nested (has embedded dots), move the leading part
-        // over to the CompUnit path.  So e.g.:
-        //   CompUnit{A.B}, Symbol="X.Y"
-        // becomes
-        //   CompUnit{A.B.X}, Symbol="Y"
-        int dotIdx = symbol.indexOf(".");
-        if( dotIdx != -1 ) {
-            String pre = symbol.substring(0,dotIdx);
-            String rest = symbol.substring(dotIdx+1 );
-            String fname = cunit._fname + "/" + pre;
-            File f = CompUnit.source(fname);
-            if( f.exists() ) {
-                CompUnit sub = makeCUnit(code,cunit,pre);
-                // enqueue also parses parents: their initialization must precede a child.
-                CompUnit dcunit = findCUnitModule(code,sub,rest);
-                if( dcunit != null )
-                    return dcunit; // Nested dot search found cunit
-            }
-        }
-
-        // Look in mod / fname / name / symbol.smp
-        String fname = cunit._fname + "/" + symbol;
-        File f = CompUnit.source(fname);
-        if( f.exists() ) {
-            CompUnit sub = makeCUnit(code,cunit,symbol);
-            // If not seen before or out of date, parse the new nested cunit
-            if( sub._clz == null && WORK.find(sub) == -1 )
-                enqueue(sub);
-            return sub;
-        }
-
-        // Look up the scope
-        return findCUnitModule( code, cunit._par, symbol );
-    }
-
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RIPRelSize.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RIPRelSize.java
deleted file mode 100644
index 48319006..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RIPRelSize.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-// This Node rip-relative encodings has sizes that vary by delta
-public interface RIPRelSize {
-    // delta is the distance from the opcode *start* to the target start.  Each
-    // hardware target adjusts as needed.  X86 measures from the opcode *end*
-    // and small jumps are 2 bytes, so they'll need to subtract 2.
-    byte encSize(int delta);
-
-    // Patch full encoding in.  Used for both short and long forms.  delta
-    // again is from the opcode *start*.
-    void patch( Encoding enc, int opStart, int opLen, int delta );
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RegAlloc.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RegAlloc.java
deleted file mode 100644
index ac792988..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RegAlloc.java
+++ /dev/null
@@ -1,780 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.Utils;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import java.util.Arrays;
-import java.util.BitSet;
-import java.util.IdentityHashMap;
-
-/**
-  * "Briggs/Chaitin/Click".
-  * Graph coloring.
-  * <p>
-  * Every def and every use have a bit-set of allowed registers.
-  * Fully general to bizarre chips.
-  * Multiple outputs fully supported, e.g. add-with-carry or combined div/rem or "xor rax,rax" setting both rax and flags.
-  * <p>
-  * Intel 2-address accumulator-style ops fully supported.
-  * Op-to-stack-spill supported.
-  * All addressing modes supported.
-  * Register pairs could be supported with some grief.
-  * <p>
-  * Splitting instead of spilling (simpler implementation).
-  * Stack slots are "just another register" (tiny stack frames, simpler implementation).
-  * Stack/unstack during coloring with a marvelous trick (simpler implementation).
-  * <p>
-  * Both bitset and adjacency list formats for the interference graph; one of
-  * the few times it's faster to change data structures mid-flight rather than
-  * just wrap one of the two.
-  * <p>
-  * Liveness computation and interference graph built in the same one pass (one
-  * fewer passes per round of coloring).
-  * <p>
-  * Single-register def or use live ranges deny neighbors their required
-  * register and thus do not interfere, vs interfering and denying the color
-  * and coloring time.  Basically all function calls do this, but many oddball
-  * registers also, e.g. older div/mod/mul ops. (5x smaller IFG, the only
-  * O(n^2) part of this operation).
-  */
-
-public class RegAlloc {
-    // Main Coloring Algorithm:
-    // Repeat until colored:
-    //   Build Live Ranges (LRGs)
-    //   - Intersect allowed registers
-    //   If hard conflicts (LRGs with no allowed registers)
-    //   - Pre-split conflicted LRGs, and repeat
-    //   Build Interference Graph (IFG)
-    //   - Self conflicts split now
-    //   Color (remove trivial first then any until empty; reverse assign colors
-    //   - If color fails:
-    //   - - Split uncolorable LRGs
-
-    // Top-level program graph structure
-    final CodeGen _code;
-
-    public int _spills, _spillScaled;
-
-    private boolean _done;
-
-    // -----------------------
-    // Live ranges with self-conflicts or no allowed registers
-    private final IdentityHashMap<LRG,String> _failed = new IdentityHashMap<>();
-    // Loop Phis get one chance to color after only cold self-conflict splits.
-    // If the same Phi self-conflicts again, split its hot def/backedge also.
-    private final IdentityHashMap<PhiNode,String> _deferredLoopSelf = new IdentityHashMap<>();
-    void fail( LRG lrg ) {
-        assert lrg.leader();
-        _failed.put(lrg,"");
-    }
-    boolean success() { return _failed.isEmpty(); }
-    public boolean done() { return _done; }
-
-
-    // -----------------------
-    // Map from Nodes to Live Ranges
-    private final IdentityHashMap<Node,LRG> _lrgs = new IdentityHashMap<>();
-    short _lrg_num;
-
-    // Define a new LRG, and assign n
-    LRG newLRG( Node n, FunNode fun ) {
-        LRG lrg = lrg(n);
-        if( lrg!=null ) return lrg;
-        lrg = new LRG(_lrg_num++, fun);
-        LRG old = _lrgs.put(n,lrg); assert old==null;
-        return lrg;
-    }
-
-    // LRG for n
-    public LRG lrg( Node n ) {
-        LRG lrg = _lrgs.get(n);
-        if( lrg==null ) return null;
-        LRG lrg2 = lrg.find();
-        if( lrg != lrg2 )
-            _lrgs.put(n,lrg2);
-        return lrg2;
-    }
-
-    // Find LRG for n.in(idx), and also map n to it
-    LRG lrg2( Node n, int idx ) {
-        LRG lrg = lrg(n.in(idx));
-        return union(lrg,n);
-    }
-
-    // Union any lrg for n with lrg and map to the union
-    LRG union( LRG lrg, Node n ) {
-        LRG lrgn = _lrgs.get(n);
-        LRG lrg3 = lrg.union(lrgn);
-        _lrgs.put(n,lrg3);
-        return lrg3;
-    }
-
-    // Force all unified to roll up; collect live ranges
-    LRG[] _LRGS;
-    void unify() {
-        Ary<LRG> lrgs = new Ary<>(LRG.class);
-        for( Node n : _lrgs.keySet() ) {
-            LRG lrg = lrg(n);
-            lrgs.setX(lrg._lrg,lrg);
-        }
-        _LRGS = lrgs.asAry();
-        // Remove unified lrgs from failed set also
-        for( LRG lrg : _failed.keySet().toArray(new LRG[0]) ) {
-            if( !lrg.leader() ) {
-                LRG lrg2 = lrg.find();
-                _failed.remove(lrg);
-                _failed.put(lrg2,"");
-            }
-        }
-    }
-
-
-    // Diagnostic lookup: do not compress leaders or rewrite the node mapping.
-    private LRG _lrg(Node n) {
-        LRG lrg = _lrgs.get(n);
-        if( lrg != null )
-            while( lrg._leader != null ) lrg = lrg._leader;
-        return lrg;
-    }
-
-    public short regnum( Node n ) {
-        LRG lrg = _lrg(n);
-        return lrg==null ? -1 : lrg._reg;
-    }
-
-    // Printable register number for node n
-    String reg( Node n ) {
-        LRG lrg = _lrg(n);
-        return lrg==null ? null : reg(lrg);
-    }
-    String reg( LRG lrg ) {
-        // No register yet, use LRG
-        if( lrg._reg == -1 ) return "V"+lrg._lrg;
-        // Chosen machine register unless stack-slot and past RA
-        String[] regs = _code._mach.regs();
-        if( lrg._reg < regs.length || _code._phase.ordinal() <= CodeGen.Phase.RegAlloc.ordinal() || lrg._fun==null )
-            return RegMask.reg(regs,lrg._reg);
-        // Stack-slot past RA uses the frame layout logic
-        return "[rsp+"+lrg._fun.computeStackOffset(_code,lrg._reg)+"]";
-    }
-
-    // -----------------------
-    RegAlloc( CodeGen code ) { _code = code; }
-
-    public void regAlloc() {
-        // Insert callee-save registers
-        String[] regs = _code._mach.regs();
-        long neverSave= _code._mach.neverSave();
-        for( CFGNode bb : _code._cfg )
-            if( bb instanceof FunNode fun ) {
-                ReturnNode ret = fun.ret();
-                int len = Math.min(regs.length,64);
-                for( int reg=0; reg<len; reg++ )
-                    if( !_code._callerSave.test(reg) && ((1L<<reg)&neverSave)==0 ) {
-                        ret.addDef(new CalleeSaveNode(fun,reg,regs[reg]));
-                        assert ret.regmap(ret.nIns()-1).firstReg()==reg;
-                    }
-            }
-        // Cache reg masks for New and Call
-        for( CFGNode bb : _code._cfg ) {
-            if( bb instanceof CallEndMach cend ) cend.cacheRegs(_code);
-            for( Node n : bb._outputs )
-                if( n instanceof NewNode nnn ) nnn.cacheRegs(_code);
-        }
-        // Expensive assert: useful when chasing cross-function allocator edges.
-        //assert verifyFunctionLocalEdges();
-
-        // Top driver: repeated rounds of coloring and splitting.
-        byte round=0;
-        while( !graphColor(round) ) {
-            split(round);
-            if( round >= 7 )    // Really expect to be done soon
-                throw new IllegalStateException("Register allocation made no progress after eight rounds");
-            round++;
-        }
-        postColor();                       // Remove no-op spills
-        _done = true;
-    }
-
-    boolean verifyFunctionLocalEdges() {
-        for( CFGNode bb : _code._cfg )
-            for( Node use : bb._outputs ) {
-                FunNode useFun = funOf(use);
-                for( int i=1; i<use.nIns(); i++ ) {
-                    Node def = use.in(i);
-                    if( def==null || def.isConst() || allowedCrossFunctionEdge(use,i,def) )
-                        continue;
-                    FunNode defFun = funOf(def);
-                    if( defFun != null && useFun != null && defFun != useFun )
-                        throw new AssertionError(crossFunctionMessage(def,defFun,use,useFun,i));
-                }
-            }
-        return true;
-    }
-
-    private static String crossFunctionMessage(Node def, FunNode defFun, Node use, FunNode useFun, int idx) {
-        StringBuilder sb = new StringBuilder("Cross-function value edge: ");
-        sb.append(def.uniqueName()).append("(").append(defFun.label()).append(") -> ")
-          .append(use.uniqueName()).append("(").append(useFun.label()).append(") input ").append(idx)
-          .append(" def=").append(def).append(" use=").append(use).append("\n  all uses:");
-        for( Node out : def.outs() ) {
-            FunNode outFun = funOf(out);
-            sb.append("\n    ").append(out.uniqueName()).append("(")
-              .append(outFun==null ? "?" : outFun.label()).append(")");
-        }
-        return sb.toString();
-    }
-
-    private static boolean allowedCrossFunctionEdge(Node use, int idx, Node def) {
-        // Function metadata/control edges are not value live ranges.
-        if( use instanceof FunNode || use instanceof StopNode || use instanceof StopCUNode )
-            return true;
-        // Return-linked function pointers carry function identity/lifetime, not
-        // an allocator value flowing from the callee body into this function.
-        if( use instanceof FunPtrNode && def instanceof ReturnNode )
-            return true;
-        // Parm defaults and call-linked argument edges are the entry protocol;
-        // BuildLRG also skips Parm input 1.
-        if( use instanceof ParmNode )
-            return true;
-        // Linked CallEnd -> Return edges should be gone before RegAlloc, but
-        // diagnose allocator value edges rather than call graph metadata here.
-        if( use instanceof CallEndNode && def instanceof ReturnNode )
-            return true;
-        return false;
-    }
-
-    private static FunNode funOf(Node n) {
-        if( n instanceof ParmNode parm ) return parm.fun();
-        if( n instanceof ReturnNode ret ) return ret.fun();
-        if( n instanceof FunNode fun ) return fun;
-        if( n instanceof CFGNode cfg ) return cfg.fun();
-        CFGNode cfg = n.cfg0();
-        return cfg==null ? null : cfg.fun();
-    }
-
-    private boolean graphColor(byte round) {
-        _failed.clear();
-        _lrgs.clear();
-        _lrg_num = 1;
-        _LRGS=null;
-
-        return
-            // Build Live Ranges
-            BuildLRG.run(round,this) && // if no hard register conflicts
-            // Build Interference Graph
-            IFG.build(round,this) &&    // If no self conflicts or uncolorable
-            // Conservative coalesce copies
-            Coalesce.coalesce(round,this) &&
-            // Color attempt
-            IFG.color(round,this);      // If colorable
-    }
-
-    // -----------------------
-    // Split conflicted live ranges.
-    void split(byte round) {
-
-        // In C2, all splits are handling in one pass over the program.  Here,
-        // in the name of clarity, we'll handle each failing live range
-        // independently... which generally requires a full pass over the
-        // program for each failing live range.  i.e., might be a lot of
-        // passes.
-
-        // Sort, to avoid non-deterministic HashMap ordering
-        LRG[] splits = _failed.keySet().toArray(new LRG[0]);
-        Arrays.sort(splits, (x,y) -> x._lrg - y._lrg );
-        for( LRG lrg : splits )
-            split(round,lrg);
-    }
-
-    // Split this live range, top level heuristic
-    boolean split( byte round, LRG lrg ) {
-        assert lrg.leader();  // Already rolled up
-
-        if( lrg._selfConflicts != null )
-            return splitSelfConflict(round,lrg);
-
-        // Register mask when empty; split around defs and uses with limited
-        // register masks.
-        if( lrg._mask.isEmpty() ) {
-            if( lrg._1regDefCnt <= 1 &&
-                lrg._1regUseCnt <= 1 &&
-                (lrg._1regDefCnt + lrg._1regUseCnt) > 0 &&
-                // A fixed-register clone with flexible uses must split at the uses.
-                !(lrg._1regDefCnt==1 && lrg._machDef.isClone() && lrg._1regUseCnt==0) )
-                return splitEmptyMaskSimple(round,lrg);
-            // Repeated single-reg uses from a single def.  Special for archs
-            // with more fixed regs.
-            if( !lrg._multiDef && lrg._1regDefCnt <= 1 && lrg._1regUseCnt > 2 )
-                if( splitEmptyMaskByUse(round,lrg) )
-                    return true;
-        }
-        if( lrg._mask.isEmpty() && lrg._multiDef && lrg._1regUseCnt > 1 && lrg._1regDefCnt <= 1 ) {
-            if( splitEmptyMaskSingleUses(round,lrg) )
-                return true;
-        }
-
-        // Generic split-by-loop depth.
-        return splitByLoop(round,lrg);
-    }
-
-    // Split live range with an empty mask.  Specifically forces splits at
-    // single-register defs or uses and not elsewhere.
-    boolean splitEmptyMaskSimple( byte round, LRG lrg ) {
-        // Live range has a single-def single-register, and/or a single-use
-        // single-register.  Split after the def and before the use.  Does not
-        // require a full pass.
-
-        // Compute def nOuts *before* replacing those uses with a split
-        int defNouts = ((Node)lrg._machDef).nOuts();
-        // Split just after def
-        if( lrg._1regDefCnt==1 && !lrg._machDef.isClone() )
-            // Force must-split, even if a prior split same block because register
-            // conflicts.  Example:
-            //   alloc
-            //     V1/rax - forced by alloc
-            //   alloc
-            //     V2/rax - kills prior RAX
-            //   st4 [V1],len - No good, must split around
-            insertAfterAndReplace( makeSplit("def/empty1",round,lrg), (Node)lrg._machDef, false/*true*/);
-        // Split just before use
-        if( lrg._machUse!=null && (lrg._1regUseCnt==1 || (lrg._1regDefCnt==1 && defNouts==1)) )
-            insertBefore((Node)lrg._machUse,lrg._uidx,"use/empty1",round,lrg);
-        return true;
-    }
-
-    // Popular single-def value: share a split among uses with compatible masks.
-    boolean splitEmptyMaskByUse( byte round, LRG lrg ) {
-        Node def = (Node)lrg._machDef;
-        // Snapshot distinct users: rewriting an input changes def's output list,
-        // and a call can use the same value in more than one argument.
-        Ary<Node> uses = new Ary<>(Node.class);
-        for( Node use : def._outputs )
-            if( uses.find(use)==-1 ) uses.push(use);
-
-        Ary<RegMask> rclass = new Ary<>(RegMask.class);
-        int ncalls=0;
-        for( Node use : uses )
-            if( use instanceof MachNode mach ) {
-                // Sharing copies across several calls usually loses to their kills.
-                if( use instanceof CallNode && ++ncalls > 1 ) return false;
-                for( int i=1; i<use.nIns(); i++ )
-                    if( use.in(i)==def && mach.regmap(i)!=null )
-                        putIntoRegClass(rclass,mach.regmap(i));
-            }
-        if( rclass._len <= 1 ) return false;
-
-        for( RegMask rmask : rclass ) {
-            Node split = makeSplit(def,"popular",round,lrg,rmask);
-            split.insertAfter(def);
-            if( split.nIns()>1 ) split.setDef(1,def);
-            for( Node use : uses )
-                if( use instanceof MachNode mach )
-                    for( int i=1; i<use.nIns(); i++ ) {
-                        RegMask mask = mach.regmap(i);
-                        if( use.in(i)==def && mask!=null && mask.overlap(rmask) ) {
-                            assert rmask.and(mask)==rmask;
-                            use.setDefOrdered(i,split);
-                        }
-                    }
-        }
-        return true;
-    }
-
-    // Empty-mask live range with several direct single-register uses, often
-    // through a Phi with multiple defs.  Split those uses directly instead of
-    // doing a loop-depth split, which might keep isolating the wrong edge.
-    boolean splitEmptyMaskSingleUses( byte round, LRG lrg ) {
-        findAllLRG(lrg);
-        if( _ns._len <= 5 )
-            return false;
-        boolean progress = false;
-        for( Node n : _ns ) {
-            if( !(n instanceof MachNode mach) ) continue;
-            for( int i=1; i<n.nIns(); i++ ) {
-                RegMask use = mach.regmap(i);
-                if( use != null && use.size1() && lrg(n.in(i))==lrg ) {
-                    insertBefore(n,i,"use/emptyN",round,lrg);
-                    progress = true;
-                }
-            }
-        }
-        return progress;
-    }
-
-    // Narrowing preserves all earlier users of a class; new classes are disjoint.
-    // Each use contains its first overlapping class, so one pass suffices.
-    private static void putIntoRegClass( Ary<RegMask> rclass, RegMask rmask ) {
-        for( int i=0; i<rclass._len; i++ ) {
-            RegMask omask = rclass.at(i);
-            if( !omask.overlap(rmask) ) continue;
-            if( omask.and(rmask)!=omask )
-                rclass.set(i,new RegMask(omask.copy().and(rmask)));
-            return;
-        }
-        rclass.push(rmask);
-    }
-
-
-    // Self conflicts require Phis (or two-address).
-    // Insert a split after every def.
-    boolean splitSelfConflict( byte round, LRG lrg ) {
-        // Sort conflict set, so we're deterministic
-        Node[] conflicts = lrg._selfConflicts.keySet().toArray(new Node[0]);
-        Arrays.sort(conflicts, (x,y) -> x._nid - y._nid );
-
-        // First encounter with a loop Phi: try only cold splits this round.
-        // Remember the Phi across rounds so a persistent self-conflict forces
-        // the hot def/backedge splits on the next encounter.
-        IdentityHashMap<PhiNode,String> deferred = new IdentityHashMap<>();
-        for( Node def : conflicts ) {
-            if( def instanceof PhiNode phi && phi.region() instanceof LoopNode )
-                deferLoopSelf(phi,deferred);
-            for( Node use : def._outputs )
-                if( use instanceof PhiNode phi && phi.region() instanceof LoopNode &&
-                    phi._inputs.find(def)==2 )
-                    deferLoopSelf(phi,deferred);
-        }
-
-        // For all conflicts
-        for( Node def : conflicts ) {
-            assert lrg(def)==lrg; // Might be conflict use-side
-            // Split before each use that extends the live range; i.e. is a
-            // Phi or two-address
-            for( int i=0; i<def._outputs._len; i++ ) {
-                Node use = def.out(i);
-                if( (use instanceof PhiNode phi &&
-                     !(deferred.containsKey(phi) && phi.region() instanceof LoopNode && phi._inputs.find(def)==2) &&
-                     !(phi.region() instanceof LoopNode loop && phi.in(2)==def && def.cfg0().idepth() > loop.idepth() ) ) ||
-                        (use instanceof MachNode mach && mach.twoAddress()!=0 && use.in(mach.twoAddress())==def) )
-                    insertBefore( use, use._inputs.find(def), "use/self/use",round,lrg );
-            }
-            // Split after the Phi and before its entry.  Also isolate inputs
-            // shared with another Phi: otherwise the shared input keeps the
-            // conflicting live ranges joined, even after splitting the entry.
-            if( def instanceof PhiNode phi && !(def instanceof ParmNode) ) {
-                if( !deferred.containsKey(phi) ) {
-                    SplitNode split = makeSplit("def/self",round,lrg);
-                    insertAfterAndReplace(split,def,false);
-                    if( split.nOuts()==0 )
-                        split.killOrdered();
-                }
-                for( int i=1; i<(deferred.containsKey(phi) ? 2 : phi.nIns()); i++ )
-                    if( i==1 || sharedPhiInput(phi,i) )
-                        insertBefore(phi,i,"use/self/phi",round,lrg);
-            }
-            // Split before two-address ops which extend the live range
-            if( def instanceof MachNode mach && mach.twoAddress()!= 0 )
-                insertBefore(def,mach.twoAddress(),"use/self/two",round,lrg);
-        }
-        return true;
-    }
-
-    private void deferLoopSelf(PhiNode phi, IdentityHashMap<PhiNode,String> deferred) {
-        if( !_deferredLoopSelf.containsKey(phi) ) {
-            _deferredLoopSelf.put(phi,"");
-            deferred.put(phi,"");
-        }
-    }
-
-
-    private static boolean sharedPhiInput(PhiNode phi, int i) {
-        for( Node use : phi.in(i)._outputs )
-            if( use instanceof PhiNode && use!=phi ) return true;
-        return false;
-    }
-
-    // Generic: split around the outermost loop with non-split def/uses.  This
-    // covers both self-conflicts (once we split deep enough) and register
-    // pressure issues.
-    boolean splitByLoop( byte round, LRG lrg ) {
-        findAllLRG(lrg);
-
-        // Find min loop depth for all non-split defs and uses.
-        long ld = (-1L<<32) | 9999;
-        for( Node n : _ns ) {
-            if( lrg(n)==lrg ) // This is a LRG def
-                ld = ldepth(ld,n,n.cfg0());
-            // PhiNodes check all CFG inputs
-            if( n instanceof PhiNode phi ) {
-                for( int i=1; i<n.nIns(); i++ )
-                    if( phi.in(i)._type!=Type.TOP )
-                        ld = ldepth(ld, phi.in(i), phi.region().cfg(i));
-            } else {
-                // Others check uses
-                for( int i=1; i<n.nIns(); i++ )
-                    if( lrgSame(n.in(i),lrg) ) // This is a LRG use
-                        ld = ldepth(ld,n,n.cfg0());
-            }
-        }
-        int min = (int)ld;
-        int max = (int)(ld>>32);
-
-        boolean emptyMulti = lrg._mask.isEmpty() && lrg._multiDef && lrg._1regDefCnt <= 1 &&
-            (lrg._1regUseCnt > 1 || _ns._len > 5);
-        // Multi-def empty-mask conflicts need the hot/deep side isolated from
-        // fixed register uses.  Ordinary pressure splits keep the old shallow
-        // boundary behavior.
-        for( Node n : _ns ) {
-            if( n instanceof SplitNode split && !split.isNonStackSplit() && min!=max ) continue; // Ordinary splits already reach stack storage.
-            if( n.isDead() ) continue; // Some Cloneable went dead by other spill changes
-            // If this is a 2-address commutable op (e.g. AddX86, MulX86) and the rhs has only a single user,
-            // commute the inputs... which chops the LHS live ranges' upper bound to just the RHS.
-            if( n instanceof MachNode mach && lrg(n)==lrg && mach.twoAddress()==1 && mach.commutes() && n.in(2).nOuts()==1 )
-                n.swap12();
-
-            if( lrg(n)==lrg && // This is a LRG def
-                // At loop boundary, or splitting in inner loop
-                (min==max || (emptyMulti ? n.cfg0().loopDepth() >= max : n.cfg0().loopDepth() <= min)) ) {
-                // Cloneable constants will be cloned at uses, not after def
-                if( !(n instanceof MachNode mach && mach.isClone()) &&
-                    // Single user is already a split adjacent
-                    !(n.nOuts()==1 && n.out(0) instanceof SplitNode split && sameBlockNoClobber(split) ) )
-                    // Split after def in min loop nest
-                    insertAfterAndReplace( makeSplit("def/loop",round,lrg), n,true);
-            }
-
-            // PhiNodes check all CFG inputs
-            if( n instanceof PhiNode phi && !(n instanceof ParmNode)) {
-                for( int i=1; i<n.nIns(); i++ )
-                    // No split in front of a split
-                    if( !(n.in(i) instanceof SplitNode) &&
-                        // splitting in inner loop or at loop border
-                        (min==max || (emptyMulti ? phi.region().cfg(i).loopDepth() >= max : phi.region().cfg(i).loopDepth() <= min)) &&
-                        // and not around the backedge of a loop (bad place to force a split, hard to remove)
-                        !(phi.region() instanceof LoopNode && i==2 && (phi.in(i) instanceof PhiNode pp && pp.region()==phi.region())) )
-                        // Split before phi-use in prior block
-                        insertBefore(phi,i, "use/loop/phi",round,lrg);
-
-            } else {
-                // Others check uses
-                for( int i=1; i<n.nIns(); i++ ) {
-                    // This is a LRG use
-                    // splitting in inner loop or at loop border
-                    if( lrgSame( n.in( i ), lrg ) &&
-                        (min == max || (n.in(i) instanceof MachNode mach && mach.isClone()) ||
-                         (emptyMulti ? n.cfg0().loopDepth() >= max : n.cfg0().loopDepth() <= min)) )
-                        // Split before in this block
-                        insertBefore( n, i, "use/loop/use", round,lrg, false );
-                }
-            }
-        }
-        return true;
-    }
-
-    private boolean lrgSame(Node x, LRG lrg) {
-        LRG xlrg = lrg(x);
-        while( xlrg==null && x instanceof SplitNode )
-            xlrg=lrg(x = x.in(1));
-        return xlrg==lrg;
-    }
-
-    private static long ldepth( long ld, Node n, CFGNode cfg ) {
-        // Ordinary splits already reach stack storage; register-only transfers do not.
-        if( n instanceof SplitNode split && !split.isNonStackSplit() ) return ld;
-        // Collect min/max loop depth
-        int min = (int)ld;
-        int max = (int)(ld>>32);
-        int d = cfg.loopDepth();
-        // if n will lower the min loop and is in the tail end of the loop
-        // header, splitting "around" the loop will not help.  Treat n as being
-        // in the loop.
-        if( d < min ) {
-            if( cfg.uctrl() instanceof LoopNode loop && loop.entry()==cfg ) {
-                for( int i=cfg.nOuts()-2; i>=0; i-- ) {
-                    Node out = cfg.out(i);
-                    if( n==out )
-                        { d = loop.loopDepth(); break; } // Treat n as being "in the loop"
-                    if( !((out instanceof MachNode mach && mach.isClone()) || out instanceof SplitNode ) )
-                        break;  // Treat b as "normal", out of loop
-                }
-            }
-        }
-
-        // lower min, raise max, and re-fold
-        min = Math.min(min,d);
-        max = Math.max(max,d);
-        return ((long)max<<32) | min;
-    }
-
-    // Find all members of a live range, both defs and uses
-    private final Ary<Node> _ns = new Ary<>(Node.class);
-    void findAllLRG( LRG lrg ) {
-        _ns.clear();
-        int wd = 0;
-        if( lrg._machDef != null ) _ns.push((Node)lrg._machDef);
-        if( lrg._machUse != null ) _ns.push((Node)lrg._machUse);
-        while( wd < _ns._len ) {
-            Node n = _ns.at(wd++);
-            if( lrg(n)!=lrg ) continue;
-            for( Node def : n._inputs )
-                if( lrg(def)==lrg && _ns.find(def)== -1 )
-                    _ns.push(def);
-            for( Node use : n._outputs )
-                if( _ns.find(use)== -1 )
-                    _ns.push(use);
-        }
-        for( Node n : _ns ) assert !n.isDead();
-    }
-
-    void insertBefore(Node n, int i, String kind, byte round, LRG lrg, boolean skip) {
-        Node def = n.in(i);
-        // Phi splitting may visit the synthetic never-exit arm.
-        if( def._type==Type.TOP ) return;
-        // Effective block for use
-        CFGNode cfg = n instanceof PhiNode phi ? phi.region().cfg(i) : n.cfg0();
-        // Use-side RegMask, if available
-        RegMask umask = n instanceof MachNode mach ? mach.regmap(i) : null;
-        // Def is a split ?
-        if( skip && def instanceof SplitNode ) {
-            boolean singleReg = umask!=null && umask.size1();
-            // Same block, multiple registers, split is only used by n,
-            // assume this is good enough and do not split again.
-            if( cfg==def.cfg0() && def.nOuts()==1 && !singleReg )
-                return;
-        }
-        makeSplit(def,kind,round,lrg,umask).insertBefore(n, i);
-        // Skip split-of-split same block
-        if( skip && def instanceof SplitNode && cfg==def.cfg0() )
-            n.in(i).setDefOrdered(1,def.in(1));
-    }
-    void insertBefore(Node n, int i, String kind, byte round, LRG lrg) {
-        insertBefore(n,i,kind,round,lrg,true);
-    }
-
-    // Replace uses of `def` with `split`, and insert `split` immediately after
-    // `def` in the basic block.
-    public void insertAfterAndReplace( Node split, Node def, boolean must ) {
-        split.insertAfter(def);
-        if( split.nIns()>1 ) split.setDef(1,def);
-        for( int j=def.nOuts()-1; j>=0; j-- ) {
-            Node use = def.out(j);
-            if( use==split ) continue; // Skip self
-            // Can we avoid a split of a split?  'this' split is used by
-            // another split in the same block.
-            if( !must && use instanceof SplitNode split2 && sameBlockNoClobber(split2) )
-                continue;
-            int idx = use._inputs.find(def);
-            use.setDefOrdered(idx,split);
-            if( j < def.nOuts() ) j++;
-        }
-    }
-
-    private Node makeSplit( Node def, String kind, byte round, LRG lrg, RegMask umask ) {
-        // Clone simple constants if possible
-        Node split = def instanceof MachNode mach && mach.isClone() && (umask==null || mach.outregmap().overlap(umask))
-            ? mach.copy()
-            : _code._mach.split(lrg,kind,round);
-        _lrgs.put(split,lrg);
-        return split;
-    }
-    private SplitNode makeSplit( String kind, byte round, LRG lrg ) {
-        SplitNode split = _code._mach.split(lrg,kind,round);
-        _lrgs.put(split,lrg);
-        return split;
-    }
-
-
-    // -----------------------
-    // POST PASS: Remove empty spills that biased-coloring made
-    private void postColor() {
-        int maxReg = -1;
-        for( CFGNode bb : _code._cfg ) { // For all ops
-            if( bb instanceof FunNode )
-                maxReg = -1;   // Reset for new function
-            // Compute frame size, based on arguments and largest reg seen
-            if( bb instanceof ReturnNode ret )
-                ret.fun().computeFrameAdjust(_code,maxReg);
-            // Raise frame size by max stack args passed, even if ignored
-            if( bb instanceof CallEndMach cend )
-                maxReg = Math.max(maxReg,cend._xslot);
-
-            for( int j=0; j<bb.nOuts(); j++ ) {
-                Node n = bb.out(j);
-                if( lrg(n)!=null )
-                    maxReg = Math.max(maxReg,lrg(n)._reg+1);
-                // Raise frame size by max stack args passed to New
-                if( n instanceof NewNode nnn )
-                    maxReg = Math.max(maxReg,nnn._xslot);
-
-                if( !(n instanceof SplitNode ) ) continue;
-                int defreg = lrg(n     )._reg;
-                int usereg = lrg(n.in(1))._reg;
-                // Attempt to bypass split
-                if( defreg != usereg && splitBypass(bb,j,n,defreg) )
-                    usereg = lrg(n.in(1))._reg;
-
-                // Same register, or the next instruction can use the source directly.
-                if( defreg == usereg || splitForward(bb,j,n,usereg) ) {
-                    n.removeSplit();
-                    j--;
-                    continue;
-                }
-                // Split is kept; count against split score
-                _spills++;
-                _spillScaled += (1<<bb.loopDepth()*3);
-                assert _spillScaled >= 0;
-            }
-        }
-    }
-
-    // A sole, adjacent use can read the source register directly.  Nothing can
-    // clobber it in between; only the operand mask and two-address tie remain.
-    private boolean splitForward( CFGNode bb, int j, Node split, int reg ) {
-        if( split.nOuts()!=1 || j+1==bb.nOuts() ) return false;
-        Node use = split.out(0);
-        if( use!=bb.out(j+1) || use instanceof PhiNode || use instanceof CFGNode ||
-            !(use instanceof MachNode mach) ) return false;
-        int i = use._inputs.find(split);
-        RegMask mask = mach.regmap(i);
-        return mask!=null && mask.test(reg) && mach.twoAddress()!=i;
-    }
-
-    private boolean splitBypass( CFGNode bb, int j, Node lo, int defreg ) {
-        // Attempt to bypass split
-        Node hi = lo.in(1);
-        while( true ) {
-            if( !(hi instanceof SplitNode && lo.cfg0() == hi.cfg0()) )
-                return false;
-            if( lrg(hi.in(1))._reg==defreg )
-                break;
-            hi = hi.in(1);
-        }
-        // Walk backward from the later copy, including instructions without results.
-        for( int idx = j-1; bb.out(idx) != hi; idx--) {
-            Node n = bb.out(idx);
-            if( clobbers(n,defreg) )
-                return false;   // Clobbered
-        }
-        lo.setDefOrdered(1,hi.in(1));
-        return true;
-    }
-
-
-    private boolean clobbers(Node n, int reg) {
-        LRG lrg = lrg(n);
-        return lrg!=null && (lrg._reg==reg || lrg._reg==-1 && lrg._mask.size1() && lrg._mask.firstReg()==reg) ||
-            n instanceof MachNode mach && mach.killmap()!=null && mach.killmap().test(reg);
-    }
-
-    public boolean sameBlockNoClobber( SplitNode split ) {
-        Node def = split.in(1);
-        CFGNode cfg = def.cfg0();
-        if( cfg != split.cfg0() ) return false; // Not same block
-        // Get multinode head
-        Node def0 = def instanceof ProjNode ? def.in(0) : def;
-        int defreg = lrg(def)._reg;
-        if( defreg == -1 ) defreg = lrg(def)._mask.firstReg();
-        if( defreg == -1 ) return false; // no allowed registers -> clobbered
-        for( int idx = cfg._outputs.find(split) -1; idx >= 0; idx-- ) {
-            Node n = cfg.out(idx);
-            if( n==def0 ) return true;    // No clobbers
-            if( lrg(n) == lrg(def) ) return false; // Self conflict
-            if( clobbers(n,defreg) )
-                return false;   // Clobbered
-        }
-        throw Utils.TODO("Should not reach here");
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RegMask.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RegMask.java
deleted file mode 100644
index 9cb9ec16..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RegMask.java
+++ /dev/null
@@ -1,121 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-/** RegMask
- *  A "register mask" - 1 bit set for each allowed register.  In addition,
- *  "stack slot" registers may be allowed, effectively making the set infinite.
- * <p>
- *  For smaller and simpler machines it suffices to make such masks an i64 or
- *  i128 (64- or 128-bit integers), and this presentation is by far the better
- *  way to go... if all register allocations can fit in this bit limitation.
- *  The allocator will need bits for stack-based parameters and for splits
- *  which cannot get a register.  For a 32-register machine like the X86, add 1
- *  for flags - gives 33 registers.  Using a Java `long` has 64 bits, leaving
- *  31 for spills and stack passing.  This is adequate for nearly all
- *  allocations; only the largest allocations will run this out.  However, if
- *  we move to a chip with 64 registers we'll immediately run out, and need at
- *  least a 128 bit mask.  Since you cannot *return* a 128 bit value directly
- *  in Java, Simple will pick up a `RegMask` class object.
-*/
-public class RegMask {
-
-    long _bits0, _bits1;
-
-    private static final RegMask EMPTY = new RegMask(0L);
-    public  static final RegMask FULL = new RegMask(-1L);
-
-    public RegMask(int bit) {
-        if( bit < 64 ) _bits0 = 1L<<bit;
-        else _bits1 = 1L<<(bit-64);
-    }
-    public RegMask(long bits ) { _bits0 = bits; }
-    public RegMask(long bits0, long bits1 ) { _bits0 = bits0; _bits1 = bits1; }
-    public RegMask(RegMask r) { _bits0 = r._bits0; _bits1 = r._bits1; }
-
-    // AND, with copy-on-write if changing
-    RegMask and( RegMask mask ) {
-        if( mask==null ) return this;
-        long bits0 = _bits0 & mask._bits0;
-        long bits1 = _bits1 & mask._bits1;
-        if( bits0==_bits0 && bits1==_bits1 ) return this;
-        if( bits0==mask._bits0 && bits1==mask._bits1 ) return mask;
-        if( bits0==0 && bits1==0 ) return EMPTY;
-        // Update-in-place a mutable mask, or make a defensive copy
-        return null;
-    }
-    RegMask sub( RegMask mask ) {
-        if( mask==null ) return this;
-        long bits0 = _bits0 & ~mask._bits0;
-        long bits1 = _bits1 & ~mask._bits1;
-        if( bits0==_bits0 && bits1==_bits1 ) return this;
-        if( bits0==mask._bits0 && bits1==mask._bits1 ) return mask;
-        if( bits0==0 && bits1==0 ) return EMPTY;
-        // Update-in-place a mutable mask, or make a defensive copy
-        return null;
-    }
-
-    // Fails if bit is set, because this is immutable
-    public boolean clr( int reg ) {
-        if( reg <  64 ) return ((_bits0 >> reg)&1)==0;
-        if( reg < 128 ) return ((_bits1 >> reg)&1)==0;
-        return true;
-    }
-
-
-    public short firstReg() {
-        if( isEmpty() ) return -1;
-        return (short)(_bits0 != 0
-                       ? Long.numberOfTrailingZeros(_bits0)
-                       : Long.numberOfTrailingZeros(_bits1)+64);
-    }
-    public short nextReg(short reg) {
-        if( reg < 63 ) {
-            long bits0 = _bits0 & (-1L << (reg+1));
-            if( bits0!=0 ) return (short)Long.numberOfTrailingZeros(bits0);
-        }
-        long bits1 = reg < 64 ? _bits1 : reg < 127 ? _bits1 & (-1L << (reg-63)) : 0;
-        return bits1==0 ? -1 : (short)(64+Long.numberOfTrailingZeros(bits1));
-    }
-
-    boolean isEmpty() { return _bits0==0 && _bits1==0; }
-
-    public boolean test( int reg ) {
-        return ((reg<64 ? (_bits0 >> reg) : (_bits1 >> (reg-64))) & 1)  != 0;
-    }
-
-    // checks if the 2 masks have at least 1 bit in common
-    public boolean overlap( RegMask mask ) { return (_bits0 & mask._bits0)!=0 || (_bits1 & mask._bits1)!=0; }
-
-    // Defensive writable copy
-    public RegMaskRW copy() { return new RegMaskRW( _bits0, _bits1 ); }
-
-    // Has exactly 1 bit set
-    public boolean size1() {
-        return !isEmpty() && (((_bits0 & -_bits0)==_bits0 && _bits1==0) ||
-                             ((_bits1 & -_bits1)==_bits1 && _bits0==0));
-    }
-
-    // Cardinality
-    public short size() { return (short)(Long.bitCount(_bits0)+Long.bitCount(_bits1)); }
-
-    @Override public String toString() { return toString(new SB()).toString(); }
-    public SB toString(SB sb) {
-        Machine mach = CodeGen.CODE._mach;
-        if( _bits0==0 && _bits1==0 ) return sb.p("[]");
-        sb.p("[");
-        String[] regs = mach.regs();
-        for( int i=0; i<64; i++ )
-            if( ((_bits0 >> i)&1) != 0 )
-                sb.p(reg(regs,i)).p(",");
-        for( int i=0; i<64; i++ )
-            if( ((_bits1 >> i)&1) != 0 )
-                sb.p(reg(regs,i+64)).p(",");
-        return sb.unchar().p("]");
-    }
-
-    public static String reg(String[] regs, int i) {
-        return i<regs.length ? regs[i] : "[stk#"+i+"]";
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RegMaskRW.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RegMaskRW.java
deleted file mode 100644
index 1da9a3b1..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/RegMaskRW.java
+++ /dev/null
@@ -1,36 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-// Mutable regmask(writable)
-public class RegMaskRW extends RegMask {
-    public RegMaskRW(long x, long y) { super(x,y);  }
-    // clears bit at position r. Returns true if the mask is still not empty.
-    public boolean clr(int r) {
-        if( r < 64 ) _bits0 &= ~(1L<<(r   ));
-        else         _bits1 &= ~(1L<<(r-64));
-        return _bits0!=0 || _bits1!=0;
-    }
-    // sets bit at position r.
-    public void set(int r) {
-        if( r < 64 ) _bits0 |= (1L<<(r   ));
-        else         _bits1 |= (1L<<(r-64));
-    }
-    @Override RegMaskRW and( RegMask mask ) {
-        if( mask==null ) return this;
-        _bits0 &= mask._bits0;
-        _bits1 &= mask._bits1;
-        return this;
-    }
-    @Override RegMaskRW sub( RegMask mask ) {
-        if( mask==null ) return this;
-        _bits0 &= ~mask._bits0;
-        _bits1 &= ~mask._bits1;
-        return this;
-    }
-    public RegMaskRW or( RegMask mask ) {
-        if( mask!=null ) {
-            _bits0 |= mask._bits0;
-            _bits1 |= mask._bits1;
-        }
-        return this;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/SourceError.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/SourceError.java
deleted file mode 100644
index f2f46146..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/SourceError.java
+++ /dev/null
@@ -1,49 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.util.SB;
-import java.io.IOException;
-import java.nio.charset.StandardCharsets;
-import java.nio.file.Files;
-import java.nio.file.Path;
-
-/** Format one parser byte offset. Source is read and text built only on error. */
-public abstract class SourceError {
-    public static String format(CompUnit cu, int pos, String message) {
-        String file=cu.sourceFile();
-        String name=file==null ? cu._fname+".smp" : file;
-        byte[] source;
-        try {
-            source=cu._src!=null ? cu._src.getBytes(StandardCharsets.UTF_8)
-                : file==null ? null : Files.readAllBytes(Path.of(file));
-        } catch( IOException ex ) { source=null; }
-        if( source==null || pos<0 || pos>source.length )
-            return name+": error: "+message+" (source unavailable at byte offset "+pos+")";
-
-        int line=1, start=0;
-        for( int i=0; i<pos; i++ )
-            if( source[i]=='\n' ) { line++; start=i+1; }
-        int end=pos;
-        while( end<source.length && source[end]!='\n' ) end++;
-        if( end>start && source[end-1]=='\r' ) end--;
-        int point=Math.min(pos,end);
-        String before=new String(source,start,point-start,StandardCharsets.UTF_8);
-        String text=new String(source,start,end-start,StandardCharsets.UTF_8);
-        int column=before.codePointCount(0,before.length())+1;
-        SB sb=new SB().p(name).p(':').p(line).p(':').p(column).p(": error: ").p(message).p("\n    ");
-        int width=0, caret=0;
-        for( int i=0; i<text.length(); ) {
-            if( i==before.length() ) caret=width;
-            int ch=text.codePointAt(i);
-            if( ch=='\t' ) {
-                int spaces=8-(width%8);
-                for( int j=0; j<spaces; j++ ) sb.p(' ');
-                width+=spaces;
-            } else { sb.p(new String(Character.toChars(ch))); width++; }
-            i+=Character.charCount(ch);
-        }
-        if( before.length()==text.length() ) caret=width;
-        sb.p("\n    ");
-        for( int i=0; i<caret; i++ ) sb.p('-');
-        return sb.p('^').toString();
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/StaticData.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/StaticData.java
deleted file mode 100644
index 616753d4..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/StaticData.java
+++ /dev/null
@@ -1,177 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.BAOS;
-import java.util.*;
-
-// Pool objects have identity independently of their initial field values.
-// References in their contents use the same symbols in ELF and emulator images.
-public final class StaticData {
-    public static final class ObjectData {
-        public final Type type;
-        public final String symbol;
-        public final boolean readOnly, external;
-        public final int alignment, size;
-        public int offset;
-        ObjectData(Type t, String name, boolean ro, boolean ext) {
-            type=t; symbol=name; readOnly=ro; external=ext;
-            alignment=t.alignment();
-            int align=1<<alignment;
-            size=t instanceof TypeStruct ts ? (Math.max(1,ts.size())+align-1)&-align : align;
-        }
-    }
-    public record Relocation(ObjectData object, int offset, int logSize, Type value) {}
-
-    final Encoding enc;
-    final LinkedHashMap<Object,ObjectData> objects = new LinkedHashMap<>();
-    final ArrayList<Relocation> relocations = new ArrayList<>();
-    final String prefix;
-
-    public ArrayList<ObjectData> entries() {
-        ArrayList<ObjectData> entries=new ArrayList<>(objects.values());
-        entries.sort(Comparator.comparingInt((ObjectData obj) -> obj.alignment).reversed());
-        return entries;
-    }
-
-    StaticData(Encoding enc) {
-        this.enc=enc;
-        prefix=enc._code.entryClinitName()+"$DATA$";
-    }
-
-    static boolean isClass(Type t) {
-        return t instanceof TypeStruct ts && Parser.startsClzPrefix(ts._name);
-    }
-
-    static CompUnit owner(CodeGen code,TypeStruct ts) {
-        return owner(code,ts._name.substring(Parser.CLZ.length()));
-    }
-    static CompUnit owner(CodeGen code,String name) {
-        if(name==null) return null;
-        CompUnit owner=null;
-        for( CompUnit cu : code._compunits.values() )
-            if( cu._cname!=null && (name.equals(cu._cname) || name.startsWith(cu._cname+".")) &&
-                (owner==null || cu._cname.length()>owner._cname.length()) ) owner=cu;
-        return owner;
-    }
-
-    ObjectData object(Type t) {
-        Object key=isClass(t) ? ((TypeStruct)t)._name
-            : t instanceof TypeFunPtr fp ? functionSymbol(fp) : t;
-        ObjectData old=objects.get(key);
-        if( old!=null ) return old;
-        boolean clz=isClass(t);
-        if( clz && Parser.TYPES.get(((TypeStruct)t)._name) instanceof TypeStruct canonical ) t=canonical;
-        CompUnit owner=clz ? owner(enc._code,(TypeStruct)t)
-            : t instanceof TypeFunPtr fp ? owner(enc._code,enc._code._fidxs.owner(fp.fidx())) : null;
-        String symbol=clz ? ((TypeStruct)t)._name.substring(Parser.CLZ.length())+".$class"
-            : t instanceof TypeFunPtr fp ? functionSymbol(fp) : prefix+objects.size();
-        ObjectData obj=new ObjectData(t,symbol,!clz && (!(t instanceof TypeStruct ts) || ts.isConstant()),
-                                      owner!=null && owner._src==null);
-        objects.put(key,obj);
-        // Register before following fields: class objects may refer to each other.
-        if( !obj.external && t instanceof TypeStruct ts )
-            for( Field f : ts._fields )
-                if( !f._extern && f._t.isConstant() ) target(f._t);
-        return obj;
-    }
-
-    private static boolean pointerConstant(TypeMemPtr ptr) {
-        return ptr.notNull() && (isClass(ptr._obj) || (ptr._obj.isConstant() && (!ptr._obj.isAry() || ptr._obj.isConAry())));
-    }
-
-    private void target(Type t) {
-        if( t instanceof TypeMemPtr ptr && pointerConstant(ptr) ) object(ptr._obj);
-        if( t instanceof TypeFunPtr fp && fp.notNull() &&
-            enc._code.link(fp)==null && !enc._code._externFunc.containsKey(fp.fidx()) )
-            // A dead function still needs a unique non-null identity for comparisons.
-            object(fp);
-    }
-
-    void write() {
-        ArrayList<Encoding.Relo> refs=new ArrayList<>(enc._bigCons.values());
-        refs.sort(Comparator.comparingInt(r -> r._op._nid));
-        for( Encoding.Relo ref : refs ) object(ref._t);
-        // Definitions belong to their compilation unit, even if every local use folded.
-        ArrayList<CompUnit> units=new ArrayList<>(enc._code._compunits.values());
-        units.sort(Comparator.comparing(cu -> cu._cname==null ? "" : cu._cname));
-        for( CompUnit cu : units ) if( cu._src!=null && cu._clz!=null ) object(cu._clz);
-        for( ObjectData obj : entries() ) {
-            if( obj.external ) continue;
-            BAOS bits=obj.readOnly ? enc._cpool : enc._sdata;
-            Encoding.padN(1<<obj.alignment,bits);
-            obj.offset=bits.size();
-            if( obj.type instanceof TypeStruct ts ) writeStruct(obj,ts,bits);
-            else Encoding.addN(obj.alignment,obj.type,bits);
-            while( bits.size()<obj.offset+obj.size ) bits.write(0);
-        }
-        for( Encoding.Relo ref : refs ) {
-            ObjectData obj=object(ref._t);
-            ref._target=obj.offset;
-            ref._opStart=enc.opStart(ref._op);
-        }
-    }
-
-    private void writeStruct(ObjectData obj, TypeStruct ts, BAOS bits) {
-        int[] layout=ts.layout();
-        for( int idx : layout ) {
-            if( idx==ts._fields.length ) continue;
-            Field f=ts._fields[idx];
-            if( f._extern ) continue;
-            int off=ts.offset(idx);
-            while( bits.size()<obj.offset+off ) bits.write(0);
-            if( f._fname.equals("[]") ) ((TypeConAry)f._t).write(bits);
-            else {
-                Type value=f._t.isConstant() ? f._t : f._t.makeZero();
-                int log=f._t.log_size();
-                Encoding.addN(log,value,bits);
-                if( (value instanceof TypeFunPtr fp && fp.notNull()) ||
-                    (value instanceof TypeMemPtr ptr && pointerConstant(ptr)) )
-                    relocations.add(new Relocation(obj,off,log,value));
-            }
-        }
-        while( bits.size()<obj.offset+ts.size() ) bits.write(0);
-    }
-
-    String functionSymbol(TypeFunPtr fp) {
-        String ext=enc._code._externFunc.get(fp.fidx());
-        return ext!=null ? ext : enc._code._fidxs.symbol(fp.fidx());
-    }
-
-    String targetSymbol(Type value) {
-        if( value instanceof TypeMemPtr ptr ) return object(ptr._obj).symbol;
-        TypeFunPtr fp=(TypeFunPtr)value;
-        return enc._code.link(fp)==null && !enc._code._externFunc.containsKey(fp.fidx())
-            ? object(fp).symbol : functionSymbol(fp);
-    }
-
-    void link(int cpool, int sdata) {
-        for( Relocation rel : relocations ) {
-            long address;
-            if( rel.value instanceof TypeMemPtr ptr ) address=address(object(ptr._obj),cpool,sdata);
-            else {
-                TypeFunPtr fp=(TypeFunPtr)rel.value;
-                String ext=enc._code._externFunc.get(fp.fidx());
-                FunNode fun=enc._code.link(fp);
-                if( ext!=null ) address=enc.externalAddress(ext);
-                else if( fun==null ) address=address(object(fp),cpool,sdata);
-                else {
-                    if( !enc._code.owns(fun) ) throw new IllegalArgumentException("Unlinked function "+functionSymbol(fp));
-                    address=enc.opStart(fun);
-                }
-            }
-            // Emulator native-call sentinels are signed 32-bit addresses.
-            if( rel.logSize==2 && (address<Integer.MIN_VALUE || address>0xffff_ffffL) )
-                throw new IllegalArgumentException("Function address outside 32 bits: "+address);
-            BAOS bits=rel.object.readOnly ? enc._cpool : enc._sdata;
-            int off=rel.object.offset+rel.offset;
-            for( int i=0; i<(1<<rel.logSize); i++ ) bits.buf()[off+i]=(byte)(address>>>(8*i));
-        }
-    }
-
-    int address(ObjectData obj,int cpool,int sdata) {
-        if( obj.external ) throw new IllegalArgumentException("Unlinked class object "+obj.symbol);
-        return obj.offset+(obj.readOnly ? cpool : sdata);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/TypeCheck.java b/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/TypeCheck.java
deleted file mode 100644
index 9b4b0995..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/codegen/TypeCheck.java
+++ /dev/null
@@ -1,57 +0,0 @@
-package com.seaofnodes.simple.codegen;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.util.Ary;
-
-// Reject invalid optimized programs before lowering erases their source-level
-// obligations. Queue surviving CLInits during the same walk for Lower's Iter.
-abstract class TypeCheck {
-    static void run(CodeGen code) {
-        // Check for class-init cycles first; such a cycle can prevent other
-        // things from resolving types. The dependency graph is temporary.
-        String clzInitCycle = new ClassInitDependencies(code).check();
-        if( clzInitCycle != null )
-            throw Parser.error(clzInitCycle,null);
-
-        Ary<Node> errs = new Ary<>(Node.class);
-        code._stop.walk( n -> {
-                if( n.err() != null )
-                    errs.add(n);
-                if( n instanceof CLInitNode ) code.add(n);
-                return null;
-            });
-
-        if( !errs.isEmpty() ) {
-            // Prefer an originating error over a secondary error caused by a
-            // BOTTOM input.  If all errors are downstream-poisoned, retain
-            // the old first-error behavior.
-            Node min = null;
-            for( Node n : errs )
-                if( noBottomInputs(n) )
-                    {  min = n;  break; }
-            if( min==null )
-                min = errs.at(0);
-            for( Node n : errs )
-                if( n!=min &&
-                    noBottomInputs(n) &&
-                    ((n   instanceof MemOpNode nmop &&
-                      min instanceof MemOpNode mmop &&
-                      nmop._loc.before(mmop._loc)) ||
-                     (n   instanceof CFGNode ncfg &&
-                      min instanceof CFGNode mincfg &&
-                      ncfg.idepth() < mincfg.idepth())) )
-                    min = n;
-            if( code._obs != null ) code._obs.error(min, min.err().getMessage());
-            throw min.err();
-        }
-    }
-
-    private static boolean noBottomInputs(Node n) {
-        for( Node def : n._inputs )
-            if( def!=null && !(def instanceof FldOffNode) && def._type==Type.BOTTOM )
-                return false;
-        return true;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/AddNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/AddNode.java
deleted file mode 100644
index 8835208b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/AddNode.java
+++ /dev/null
@@ -1,179 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-
-public class AddNode extends ArithNode {
-    @Override boolean allowFloat() { return true; }
-    public AddNode(Node lhs, Node rhs) { super(null, lhs, rhs); }
-    public AddNode(Node lhs, Node rhs, byte mode) { super(null, lhs, rhs, mode); }
-
-
-    @Override public String label() { return "Add"; }
-    @Override public String op() { return "+"; }
-
-    @Override long   doOp( long  x,  long  y ) { return x + y; }
-    @Override double doOp(double x, double y ) { return x + y; }
-    @Override TypeInteger doOp(TypeInteger x, TypeInteger y) {
-        // Fold ranges like {0-1} + {2-3} into {2-4}.
-        if( !overflow(x._min,y._min) &&
-            !overflow(x._max,y._max) )
-            return TypeInteger.make(x._min+y._min,x._max+y._max);
-        return TypeInteger.BOT;
-    }
-
-    @Override
-    public Node idealize () {
-        // Settle the one-shot arithmetic mode before applying family-specific
-        // algebraic identities.
-        if( _mode==0 )
-            return super.idealize();
-
-        Node lhs = in(1);
-        Node rhs = in(2);
-        if( rhs instanceof AddNode add && add.err()!=null )
-            return null;
-        Type t2 = rhs._type;
-
-        // Add of 0.  We do not check for (0+x) because this will already
-        // canonicalize to (x+0)
-        if( t2 == TypeInteger.ZERO && lhs._type.isa(compute()) )
-            return lhs;
-
-        // Add of same to a multiply by 2
-        if( lhs==rhs && _mode==1 )
-            return new ShlNode(null,lhs,CodeGen.CODE.con(1));
-
-        // Goal: a left-spine set of adds, with constants on the rhs (which then fold).
-
-        // Move non-adds to RHS
-        if( !(lhs instanceof AddNode) && rhs instanceof AddNode )
-            return swap12();
-
-        // x+(-y) becomes x-y
-        if( rhs instanceof MinusNode minus )
-            return new SubNode(lhs,minus.in(1),_mode);
-
-        // Now we might see (add add non) or (add non non) or (add add add) but never (add non add)
-
-        // Do we have  x + (y + z) ?
-        // Swap to    (x + y) + z
-        // Rotate (add add add) to remove the add on RHS
-        if( rhs instanceof AddNode add )
-            return copy(copy(lhs,add.in(1)).peephole(), add.in(2));
-
-        // Now we might see (add add non) or (add non non) but never (add non add) nor (add add add)
-        if( !(lhs instanceof AddNode) ) {
-            // Rotate; look for (add (phi cons) con/(phi cons))
-            if( spine_cmp(lhs,rhs,this) ) return swap12();
-            Node n = phiCon(this,true);
-            return n == null ? super.idealize() : n;
-        }
-
-        // Now we only see (add add non)
-
-        // Dead data cycle; comes about from dead infinite loops.  Do nothing,
-        // the loop will peep as dead after a bit.
-        if( lhs.nIns()>=2 && lhs.in(1) == lhs )
-            return null;
-
-        // Do we have (x + con1) + con2?
-        // Replace with (x + (con1+con2) which then fold the constants
-        // lhs.in(2) is con1 here
-        // If lhs.in(2) is not a constant, we add ourselves as a dependency
-        // because if it later became a constant then we could make this
-        // transformation.
-        if( addDep(lhs.in(2))._type.isConstant() && rhs._type.isConstant() )
-            return copy(lhs.in(1),copy(lhs.in(2),rhs).peephole());
-
-
-        // Do we have ((x + (phi cons)) + con) ?
-        // Do we have ((x + (phi cons)) + (phi cons)) ?
-        // Push constant up through the phi: x + (phi con0+con0 con1+con1...)
-        Node phicon = phiCon(this,true);
-        if( phicon!=null ) return phicon;
-
-        // Now we sort along the spine via rotates, to gather similar things together.
-
-        // Do we rotate (x + y) + z
-        // into         (x + z) + y ?
-        if( spine_cmp(lhs.in(2),rhs,this) )
-            return copy(copy(lhs.in(1),rhs).peephole(),lhs.in(2));
-
-        return super.idealize();
-    }
-
-    // Rotation is only valid for associative ops, e.g. Add, Mul, And, Or, Xor.
-    // Do we have ((phi cons)|(x + (phi cons)) + con|(phi cons)|(op y con)) ?
-    // Push constant up through the phi: x + (phi con0+con0 con1+con1...)
-    static Node phiCon(Node op, boolean rotate) {
-        Node lhs = op.in(1);
-        Node rhs = op.in(2);
-        if( rhs._type==TypeInteger.TOP ) return null;
-        // LHS is either a Phi of constants, or another op with Phi of constants
-        PhiNode lphi = pcon(lhs,op);
-        if( rotate && lphi==null && lhs.nIns() > 2 ) {
-            // Only valid to rotate constants if both are same associative ops
-            if( lhs.getClass() != op.getClass() ) return null;
-            lphi = pcon(lhs.in(2),op); // Will rotate with the Phi push
-        }
-        if( lphi==null ) return null;
-        if( lphi.region().nIns() <=2 ) return null; // Phi is collapsing
-
-        // RHS is a constant or a Phi of constants
-        if( !(rhs instanceof ConstantNode) && pcon(rhs,op)==null )
-            return null;
-
-        // If both are Phis, must be same Region
-        if( rhs instanceof PhiNode && lphi.in(0) != rhs.in(0) )
-            return null;
-
-        // Note that this is the exact reverse of Phi pulling a common op down
-        // to reduce total op-count.  We don't get in an endless push-up
-        // push-down peephole cycle because the constants all fold first.
-        Node[] ns = new Node[lphi.nIns()];
-        ns[0] = lphi.in(0);
-        // Push constant up through the phi: x + (phi con0+con0 con1+con1...)
-        for( int i=1; i<ns.length; i++ )
-            ns[i] = op.copy(lphi.in(i), rhs instanceof PhiNode ? rhs.in(i) : rhs).peephole();
-        String label = lphi._label + (rhs instanceof PhiNode rphi ? rphi._label : "");
-        Node phi = new PhiNode(label,ns).peephole();
-        // Rotate needs another op, otherwise just the phi
-        return lhs==lphi ? phi : op.copy(lhs.in(1),phi);
-    }
-
-    /**
-     * Tests if the op is a phi and has all constant inputs.
-     * If not, returns null.
-     * If op is a phi, but its inputs are not all constants, then dep is added as
-     * a dependency to the phi's non-const input, because if later the input turn into a constant
-     * dep can make progress.
-     */
-    static PhiNode pcon(Node op, Node dep) {
-        return op instanceof PhiNode phi && !(phi instanceof ParmNode) && phi.allCons(dep) ? phi : null;
-    }
-
-    // Compare two off-spine nodes and decide what order they should be in.
-    // Do we rotate ((x + hi) + lo) into ((x + lo) + hi) ?
-    // Generally constants always go right, then Phi-of-constants, then muls, then others.
-    // Ties with in a category sort by node ID.
-    // TRUE if swapping hi and lo.
-    static boolean spine_cmp( Node hi, Node lo, Node dep ) {
-        if( lo._type.isConstant() || lo instanceof ConFldOffNode ) return false;
-        if( hi._type.isConstant() || hi instanceof ConFldOffNode ) return true ;
-
-        if( lo instanceof PhiNode lphi && lphi.region()._type==Type.XCONTROL ) return false;
-        if( hi instanceof PhiNode hphi && hphi.region()._type==Type.XCONTROL ) return false;
-
-        if( lo instanceof PhiNode && lo.allCons(dep) ) return false;
-        if( hi instanceof PhiNode && hi.allCons(dep) ) return true ;
-
-        if( lo instanceof PhiNode && !(hi instanceof PhiNode) ) return true;
-        if( hi instanceof PhiNode && !(lo instanceof PhiNode) ) return false;
-
-        // Same category of "others"
-        return lo._nid > hi._nid;
-    }
-
-    @Override Node copy(Node lhs, Node rhs) { return new AddNode(lhs,rhs,_mode); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/AndNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/AndNode.java
deleted file mode 100644
index a737b703..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/AndNode.java
+++ /dev/null
@@ -1,49 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-
-public class AndNode extends ArithNode {
-    public AndNode(Parser.Lexer loc, Node lhs, Node rhs) { super(loc, lhs, rhs, (byte)1); }
-
-
-    @Override public String op() { return "&"; }
-    @Override long doOp( long x, long y ) { return x & y; }
-    @Override TypeInteger doOp(TypeInteger x, TypeInteger y) {
-        // Sharpen allowed bits if either value is narrowed
-        long mask = x.mask() & y.mask();
-        return mask < 0 ? TypeInteger.BOT : TypeInteger.make(0,mask);
-    }
-
-    @Override
-    public Node idealize() {
-        Node lhs = in(1);
-        Node rhs = in(2);
-
-        Type t1 = lhs._type;
-        Type t2 = rhs._type;
-        if( !(t1 instanceof TypeInteger && t2 instanceof TypeInteger t2i) )
-            return null; // Malformed, e.g. (17 & 3.14)
-
-        // And of -1.  We do not check for (-1&x) because this will already
-        // canonicalize to (x&-1).  We do not check for zero, because
-        // the compute() call will return a zero already.
-        if( t2i.isConstant() && t2i.value()==-1 && forceInt(lhs) )
-            return lhs;
-
-        // Move constants to RHS: con*arg becomes arg*con
-        if( t1.isConstant() && !t2.isConstant() )
-            return swap12();
-
-        // Do we have ((x & (phi cons)) & con) ?
-        // Do we have ((x & (phi cons)) & (phi cons)) ?
-        // Push constant up through the phi: x & (phi con0&con0 con1&con1...)
-        Node phicon = AddNode.phiCon(this,true);
-        if( phicon!=null )
-            return phicon;
-
-        return super.idealize();
-    }
-    @Override Node copy(Node lhs, Node rhs) { return new AndNode(_loc,lhs,rhs); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ArithNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ArithNode.java
deleted file mode 100644
index 094b927f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ArithNode.java
+++ /dev/null
@@ -1,208 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-public abstract class ArithNode extends Node implements ModeNode {
-    // Source location for late reported errors
-    Parser.Lexer _loc;
-    // Mode is 0 for unknown, 1 for int, 2 for flt
-    byte _mode;
-
-    public ArithNode( Parser.Lexer loc, Node lhs, Node rhs) { super(null, lhs, rhs); _loc = loc; }
-    public ArithNode( Parser.Lexer loc, Node lhs, Node rhs, byte mode) { this(loc,lhs,rhs); _mode=mode; }
-
-    abstract String op();
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.open().n(in(1)).p(op()).n(in(2)).close();
-    }
-
-    abstract long doOp(long x, long y);
-    abstract TypeInteger doOp(TypeInteger x, TypeInteger y);
-    double doOp(double x, double y) { throw Utils.TODO(); }
-
-    @Override public byte mode() { return _mode; }
-    @Override public Node setMode(byte mode) {
-        assert _mode==0 && (mode==1 || mode==2);
-        unlock();               // _mode participates in GVN hash and equality
-        _mode = mode;
-        return this;
-    }
-    static byte mode( Type t1, Type t2 ) {
-        if( t1 instanceof TypeFloat   || t2 instanceof TypeFloat   )  return 2;
-        if( t1 instanceof TypeInteger && t2 instanceof TypeInteger )  return 1;
-        if( t1 instanceof TypeMemPtr  && t2 instanceof TypeMemPtr  )  return 1;
-        if( t1 instanceof TypeFunPtr  && t2 instanceof TypeFunPtr  )  return 1;
-        return 0;
-    }
-
-    // Int-only ops, such as &, | and shifts, can collapse to one input.  If
-    // that input, or the live arms of a Phi input, are still mode-polymorphic
-    // ops, settle them before returning the value so the replacement remains
-    // at least as narrow as the int-only op.
-    static boolean forceInt(Node n) {
-        if( n instanceof ModeNode mode && mode.mode()==0 ) {
-            mode.setMode((byte)1);
-            n.setType(n.compute());
-            // Mode changes remove n from GVN even if the caller's remaining
-            // conditions prevent replacing the int-only operation by n.
-            CodeGen.CODE.add(n);
-        }
-        return true;
-    }
-
-    // Check that a settled mode agrees with all data inputs.  Takes the Node
-    // instead of a varargs list both to avoid allocation and to keep this ready
-    // to become shared mode-aware Node behavior later.
-    static Parser.ParseException nodeErr(Node n, Parser.Lexer loc, String op, byte mode, boolean allowFloat) {
-        Type bad = null;
-        for( int i=1; i<n.nIns(); i++ ) {
-            Type t = n.in(i)._type;
-            if( t==null )
-                return null;
-            if( t.isHigh() )
-                return null;
-            // A weak input is not evidence of a bad mode while the graph is
-            // still being built.  Loop Phis commonly await their backedge.
-            if( CodeGen.CODE._phase.ordinal() < CodeGen.Phase.Opto.ordinal() && t == Type.BOTTOM )
-                return null;
-            bad = switch( t ) {
-            case TypeInteger ti -> mode==1 ? null : t;
-            case TypeMemPtr  ti -> mode==1 ? null : t;
-            case TypeFunPtr  ti -> mode==1 ? null : t;
-            case TypeFloat   tf -> mode==2 ? null : t;
-            default -> t;
-            };
-            if( bad != null ) break;
-        }
-        boolean unsupportedFloat = false;
-        if( !allowFloat )
-            for( int i=1; i<n.nIns(); i++ )
-                if( n.in(i)._type instanceof TypeFloat ) {
-                    bad = n.in(i)._type;
-                    unsupportedFloat = true;
-                    break;
-                }
-        if( bad == null )
-            return null;
-        if( unsupportedFloat || n instanceof BoolNode )
-            return Parser.error("Cannot '"+op+"' "+bad,loc);
-        if( n.nIns()==3 )
-            return Parser.error("Cannot "+n.in(1)._type+" "+op+" "+n.in(2)._type,loc);
-        return Parser.error("Cannot '"+op+"' "+bad,loc);
-    }
-
-    // Arithmetic subclasses which have a floating-point interpretation override.
-    boolean allowFloat() { return false; }
-
-    // Generic arithmetic op math: high returns high; low returns low; 2
-    // constants fold; only 2 non-constants call specialized math.
-    @Override
-    public final Type compute() {
-        Type t1 = in(1)._type, t2 = in(2)._type;
-        if( t1==null || t2==null )        return Type.TOP;
-        if( t1.isHigh() || t2.isHigh() )  return Type.TOP;
-        if( t1==Type.BOTTOM || t2==Type.BOTTOM ) return Type.BOTTOM;
-        byte mode = _mode==0 ? mode(t1,t2) : _mode;
-        if( mode==0 )
-            return CodeGen.CODE._phase.ordinal() < CodeGen.Phase.Opto.ordinal() ? Type.BOTTOM : Type.TOP;
-        if( mode==1 ) {
-            if( t1 instanceof TypeInteger x &&
-                t2 instanceof TypeInteger y )
-                return x.isConstant() && y.isConstant()
-                    ? con(x,y)
-                    : doOp(x,y).makeWide( (byte)Math.max(x._widen,y._widen) );
-            return TypeInteger.BOT;
-        }
-        // FP handling
-        if( t1 instanceof TypeFloat f1 &&
-            t2 instanceof TypeFloat f2 ) {
-            if( f1.isConstant() && f2.isConstant() )
-                return TypeFloat.constant(doOp(f1.value(),f2.value()));
-            return t1.meet(t2);
-        }
-        return TypeFloat.F64;
-    }
-
-    private TypeInteger con( Type t1, Type t2 ) {
-        return TypeInteger.constant( doOp( ((TypeInteger)t1).value(), ((TypeInteger)t2).value()) );
-    }
-
-    // Check for "op(Phi(con,x),Phi(con,y))" and push-up through the Phi.
-    // Note that this is the exact reverse of Phi pulling a common op down
-    // to reduce total op-count.  We don't get in an endless push-up
-    // push-down peephole cycle because the constants all fold first.
-    // Returns "Phi(op(con,con),op(x,y))".
-
-    // Expected to be called after other ideal checks are done.
-    @Override public Node idealize() {
-        Type t1 = in(1)._type, t2 = in(2)._type;
-
-        // Can we decide int vs flt?
-        if( _mode==0 ) {
-            byte mode = mode(t1,t2);
-            if( mode!=0 ) return setMode(mode).init();
-        }
-        if( _mode==2 ) {
-            if( t1 instanceof TypeInteger ) return copy(new ToFloatNode(in(1)).peephole(),in(2));
-            if( t2 instanceof TypeInteger ) return copy(in(1),new ToFloatNode(in(2)).peephole());
-        }
-
-        if( in(1) instanceof PhiNode lhs &&
-            in(2) instanceof PhiNode rhs &&
-            lhs.nIns() >= 2 && !lhs.inProgress() &&
-            // Disallow with self-looping phi; these will collapse
-            (lhs.nIns() > 2 && lhs.in(2)!=lhs && rhs.nIns() > 2 && rhs.in(2)!=rhs) ) {
-            Node r = lhs.region();
-            if( r==rhs.region() && !(r instanceof FunNode) &&
-                // For loops, the backedge *must* fold away, lest we unroll forever
-                (!(r instanceof LoopNode) || isCon(lhs,rhs,2)) ) {
-                // Profit check: only 1 instance of `this` will remain, all the
-                // others will fold to constants.  For loops, *all* must fold away
-                int cnt=0;
-                for( int i=1; i<lhs.nIns(); i++ )
-                    if( isCon(lhs,rhs,i) )
-                        cnt++;
-                if( lhs.nIns()-1 - cnt <= 1 ) {
-                    // Profit!  Push up-phi and fold
-                    Node[] ns = new Node[lhs.nIns()];
-                    ns[0] = lhs.in(0);
-                    for( int i=1; i<lhs.nIns(); i++ ) {
-                        ns[i] = isCon(lhs,rhs,i)
-                            ? ConstantNode.make(con(lhs.in(i)._type, rhs.in(i)._type)).peephole()
-                            : copy(lhs.in(i), rhs.in(i)).peephole();
-                    }
-                    String label = lhs._label==rhs._label ? lhs._label : lhs._label + rhs._label;
-                    return new PhiNode(label, ns).peephole();
-                }
-            }
-        }
-
-        return null;
-    }
-
-    static boolean isCon( PhiNode lhs, PhiNode rhs, int i ) {
-        return lhs.in(i)._type.isConstant() && rhs.in(i)._type.isConstant();
-    }
-
-
-    static boolean overflow( long x, long y ) {
-        if(    (x ^    y   ) < 0 ) return false; // unequal signs, never overflow
-        return (x ^ (x + y)) < 0; // sum has unequal signs, so overflow
-    }
-
-    @Override public Parser.ParseException err() {
-        return nodeErr(this,_loc,op(),_mode,allowFloat());
-    }
-
-    @Override public boolean eq( Node n ) { return _mode==((ArithNode)n)._mode; }
-    @Override public int hash() { return _mode; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/BoolNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/BoolNode.java
deleted file mode 100644
index dd0bc996..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/BoolNode.java
+++ /dev/null
@@ -1,188 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-import static com.seaofnodes.simple.type.TypeInteger.*;
-
-abstract public class BoolNode extends Node implements ModeNode {
-
-    // Mode is 0 for unknown, 1 for int, 2 for flt
-    byte _mode;
-
-    public BoolNode(Node lhs, Node rhs) { super(null, lhs, rhs); }
-    public BoolNode(Node lhs, Node rhs, byte mode) { super(null, lhs, rhs); _mode = mode; }
-
-
-    abstract public String op(); // String opcode name
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.open().n(in(1)).p(op()).n(in(2)).close();
-    }
-
-    @Override
-    public TypeInteger compute() {
-        Type t1 = in(1)._type;
-        Type t2 = in(2)._type;
-        if( t1==null || t2==null )
-            return BOOL;
-        // Exactly equals?
-        if( t1.isHigh() || t2.isHigh() )
-            return (TypeInteger)BOOL.dual();
-        if( in(1)==in(2) )
-            // LT fails, both EQ and LE succeed
-            return this instanceof LT ? FALSE : TRUE;
-        byte mode = _mode==0 ? ArithNode.mode(t1,t2) : _mode;
-        if( mode==0 )
-            return BOOL;
-        // Handle integer compares
-        if( mode==1 ) {
-            if( t1 instanceof TypeInteger i1 &&
-                t2 instanceof TypeInteger i2 )
-                return doOp(i1,i2);
-            return BOOL;
-        }
-        // Floating compare.  Mixed inputs are converted in idealize().
-        if( t1 instanceof TypeFloat f1 &&
-            t2 instanceof TypeFloat f2 &&
-            f1.isConstant() && f2.isConstant() )
-            return doOp(f1.value(), f2.value()) ? TRUE : FALSE;
-        return BOOL;
-    }
-
-    TypeInteger doOp(TypeInteger t1, TypeInteger t2) { throw Utils.TODO(); }
-    boolean doOp(double lhs, double rhs) { throw Utils.TODO(); }
-    public boolean isFloat() { assert _mode!=0; return _mode==2; }
-    @Override public byte mode() { return _mode; }
-    @Override public Node setMode(byte mode) {
-        assert _mode==0 && (mode==1 || mode==2);
-        unlock();               // _mode participates in GVN hash and equality
-        _mode = mode;
-        return this;
-    }
-
-    @Override
-    public Node idealize() {
-        // Compare of same
-        if( in(1)==in(2) )
-            return this instanceof LT ? CodeGen.CODE.ZERO : ConstantNode.make(TRUE);
-        // Can we decide int vs flt?
-        Type t1 = in(1)._type, t2 = in(2)._type;
-        if( t1==null || t2==null )
-            return null;
-        if( _mode==0 ) {
-            byte mode = ArithNode.mode(t1,t2);
-            if( mode!=0 ) return setMode(mode).init();
-        }
-        if( _mode==2 ) {
-            if( t1 instanceof TypeInteger ) return copy(new ToFloatNode(in(1)).peephole(),in(2));
-            if( t2 instanceof TypeInteger ) return copy(in(1),new ToFloatNode(in(2)).peephole());
-        }
-
-
-        // Equals pushes constant to the right; 5==X becomes X==5.
-        if( this instanceof EQ ) {
-            if( !(in(2) instanceof ConstantNode) ) {
-                // con==noncon becomes noncon==con
-                if( in(1) instanceof ConstantNode || in(1)._nid > in(2)._nid )
-                    // Equals sorts by NID otherwise: non.high == non.low becomes non.low == non.high
-                    return new EQ(in(2),in(1));
-            }
-            // Equals X==0 becomes a !X
-            if( (in(2)._type == ZERO || in(2)._type == Type.NIL) )
-                return new NotNode(in(1));
-        }
-
-        // Do we have ((phi cons) cmp con) ?
-        // Do we have ((phi cons) cmp (phi cons)) ?
-        // Push the compare up through the phi: (phi con0 cmp con, con1 cmp con...)
-        Node phicon = AddNode.phiCon(this,this instanceof EQ);
-        if( phicon!=null ) return phicon;
-
-        return null;
-    }
-
-    @Override public boolean eq( Node n ) { return _mode==((BoolNode)n)._mode; }
-    @Override public int hash() { return _mode; }
-    @Override public Parser.ParseException err() {
-        return ArithNode.nodeErr(this,null,op(),_mode,!(this instanceof ULT));
-    }
-
-    public static class EQ extends BoolNode {
-        public EQ(Node lhs, Node rhs) { super(lhs,rhs); }
-        public EQ(Node lhs, Node rhs, byte mode) { super(lhs,rhs, mode); }
-
-        public String op() { return "=="; }
-        TypeInteger doOp(TypeInteger i1, TypeInteger i2) {
-            if( i1==i2 && i1.isConstant() ) return TRUE;
-            if( i1._max < i2._min || i1._min > i2._max ) return FALSE;
-            return BOOL;
-        }
-        @Override boolean doOp(double lhs, double rhs) { return lhs==rhs; }
-        Node copy(Node lhs, Node rhs) { return new EQ(lhs,rhs,_mode); }
-    }
-
-    public static class NE extends BoolNode {
-        public NE(Node lhs, Node rhs) { super(lhs,rhs); }
-        public NE(Node lhs, Node rhs, byte mode) { super(lhs,rhs,mode); }
-
-        public String op() { return "!="; }
-        TypeInteger doOp(TypeInteger i1, TypeInteger i2) {
-            if( i1==i2 && i1.isConstant() ) return TRUE;
-            if( i1._max < i2._min || i1._min > i2._max ) return FALSE;
-            return BOOL;
-        }
-        @Override boolean doOp(double lhs, double rhs) { return lhs!=rhs; }
-        Node copy(Node lhs, Node rhs) { return new NE(lhs,rhs,_mode); }
-    }
-
-    public static class LT extends BoolNode {
-        public LT(Node lhs, Node rhs) { super(lhs,rhs); }
-        public LT(Node lhs, Node rhs, byte mode) { super(lhs,rhs, mode); }
-
-        public String op() { return "<" ; }
-        TypeInteger doOp(TypeInteger i1, TypeInteger i2) {
-            if( i1._max <  i2._min ) return TRUE;
-            if( i1._min >= i2._max ) return FALSE;
-            return BOOL;
-        }
-        @Override boolean doOp(double lhs, double rhs) { return lhs<rhs; }
-        Node copy(Node lhs, Node rhs) { return new LT(lhs,rhs,_mode); }
-    }
-
-    public static class LE extends BoolNode {
-        public LE(Node lhs, Node rhs) { super(lhs,rhs); }
-        public LE(Node lhs, Node rhs, byte mode) { super(lhs,rhs,mode); }
-
-        public String op() { return "<="; }
-        TypeInteger doOp(TypeInteger i1, TypeInteger i2) {
-            if( i1._max <= i2._min ) return TRUE;
-            if( i1._min >  i2._max ) return FALSE;
-            return BOOL;
-        }
-        @Override boolean doOp(double lhs, double rhs) { return lhs<=rhs; }
-        Node copy(Node lhs, Node rhs) { return new LE(lhs,rhs,_mode); }
-    }
-
-    // Unsigned less that, for range checks.  Not directly user writable.
-    public static class ULT extends BoolNode {
-        public ULT(Node lhs, Node rhs) { super(lhs,rhs,(byte)1); }
-        public ULT(Node lhs, Node rhs, byte mode) {
-            super(lhs,rhs,(byte)1);
-            assert mode==1;
-        }
-
-        public String op() { return "u<" ; }
-        TypeInteger doOp(TypeInteger i1, TypeInteger i2) {
-            if( Long.compareUnsigned(i1._max,i2._min) <  0 ) return TRUE;
-            if( Long.compareUnsigned(i1._min,i2._max) >= 0 ) return FALSE;
-            return BOOL;
-        }
-        Node copy(Node lhs, Node rhs) { return new ULT(lhs,rhs); }
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/BulkMemPhiNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/BulkMemPhiNode.java
deleted file mode 100644
index df9e4fff..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/BulkMemPhiNode.java
+++ /dev/null
@@ -1,265 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeMem;
-import com.seaofnodes.simple.util.Utils;
-
-import java.util.BitSet;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-/**
- * A Phi for bulk memory.  It covers all aliases except {@link #_aliases};
- * those aliases must be represented by parallel precise MemPhis at the same
- * program slice.
- */
-public class BulkMemPhiNode extends PhiNode {
-
-    private static final BitSet EMPTY = new BitSet();
-
-    // Excluded Aliases; empty means NO exclusions.
-    // Directly visible by design.  Empty sets share EMPTY; splitAlias performs
-    // copy-on-first-write and removes the node from GVN before mutation.
-    public BitSet _aliases;
-
-    public BulkMemPhiNode(String label, Node... inputs) {
-        this(label,EMPTY,inputs);
-    }
-
-    private BulkMemPhiNode(String label, BitSet aliases, Node... inputs) {
-        super(label, inputs);
-        _aliases = aliases;
-    }
-
-    public BulkMemPhiNode(BulkMemPhiNode phi) {
-        super(phi,phi._label);
-        _aliases = phi._aliases.isEmpty() ? EMPTY : (BitSet)phi._aliases.clone();
-    }
-
-    public BulkMemPhiNode(RegionNode r, Node sample) {
-        super(r,sample);
-        _aliases = EMPTY;
-    }
-
-    public boolean isSplit(int alias) { return _aliases.get(alias); }
-
-
-    @Override
-    public Type compute() {
-        Type t = super.compute();
-        return t instanceof TypeMem mem ? mem :
-            t==Type.BOTTOM ? TypeMem.BOT :
-            TypeMem.TOP;
-    }
-
-    @Override
-    public Node idealize() {
-        Node progress = super.idealize();
-        if( progress != null ) return progress;
-        if( ((RegionNode)region()).inProgress() || region().nIns()<=1 )
-            return null;        // Input is in-progress
-
-        // "Peek through" a MemMerge that covers this alias set on its default
-        for( int i=1; i<nIns(); i++ )
-            if( in(i) instanceof MemMergeNode mmm && canPeek(mmm) ) {
-                setDef(i,mmm.in(1));
-                return this;
-            }
-
-        // If any input or output uses or defines a specific alias we cover,
-        // make a private MemPhi for it, and add it to the excluded list.
-        for( int i=1; i<nIns(); i++ ) {
-            int alias = inputAlias(in(i));
-            if( alias!=0 )
-                return slice(alias);
-        }
-
-        for( int i=0; i<nOuts(); i++ ) {
-            int alias = outputAlias(out(i));
-            if( alias!=0 )
-                return slice(alias);
-        }
-
-        return null;
-    }
-
-    static public boolean checkMem(Node n, int alias) {
-        for( Node m : n._inputs )
-            // Bulk memory supplies this alias
-            if( m instanceof BulkMemPhiNode bulk ) {
-                if( bulk._aliases.get(alias) )
-                    return false;
-            } else if( m instanceof MemMergeNode mmm &&
-                       mmm.in(1) instanceof BulkMemPhiNode bulk &&
-                       bulk._aliases.get(alias) &&
-                       (alias >= mmm.nIns() || mmm.in(alias)==null) )
-                return false;
-        return true;
-    }
-
-
-    // True if the MemMerge has no precise slice still covered by this Phi.
-    private boolean canPeek(MemMergeNode mmm) {
-        return missingAlias(mmm)==0;
-    }
-
-    // Return an alias required by an input but still covered by this Phi, or 0.
-    private int inputAlias(Node n) {
-        return switch(n) {
-        case ParmNode p -> { assert p._idx==1; yield 0; }
-        case ProjNode proj -> 0;
-        case ConstantNode con -> {
-            assert !(con._con instanceof TypeMem tmem && tmem._alias != 1);
-            yield 0;
-        }
-        case MemMergeNode mmm -> missingAlias(mmm);
-        case MemOpNode mem -> unsplit(mem._alias);
-        case BulkMemPhiNode bulk -> missingAlias(bulk);
-        default -> throw Utils.TODO("Should not reach here");
-        };
-    }
-
-    // Return an alias required by a user but still covered by this Phi, or 0.
-    private int outputAlias(Node use) {
-        // This decision depends backwards on an immediate user's alias/set.
-        // Normal graph-neighbor enqueueing flows from defs to uses, so retain
-        // an explicit forward dependency to revisit this Phi when the user
-        // sharpens.
-        use = addDepForwards(use);
-        return switch(use) {
-        case ScopeNode scope -> 0;
-        case ParmNode parm -> 0;
-        case MemMergeNode mmm -> missingAlias(mmm);
-        case BulkMemPhiNode bulk -> missingAlias(bulk);
-        case MemOpNode mem -> unsplit(mem._alias);
-        case MemPhiNode phi -> unsplit(phi._alias);
-        case EscapeNode esc -> esc.pub()==this ? unsplit(esc.fld()._alias) : 0;
-        default -> {
-            assert use instanceof ReturnNode || use instanceof CallNode || use instanceof CLInitNode
-                : "Unexpected bulk-memory user "+use.getClass().getSimpleName()+"#"+use._nid+": "+use;
-            yield 0;
-        }
-        };
-    }
-
-    // Alias zero/one is bulk, and an already excluded precise alias cannot
-    // trigger another split of this Phi.
-    private int unsplit(int alias) {
-        if( alias <= 1 ) return 0;
-        assert !_aliases.get(alias);
-        return alias;
-    }
-
-    // First alias excluded by the neighboring bulk Phi but not by this one.
-    private int missingAlias(BulkMemPhiNode bulk) {
-        for( int alias = bulk._aliases.nextSetBit(0); alias >= 0; alias = bulk._aliases.nextSetBit(alias+1) )
-            if( !_aliases.get(alias) )
-                return alias;
-        return 0;
-    }
-
-    // First explicit MemMerge slice still covered by this Phi. A user's slice
-    // may point to this Phi after a precise Phi folds; splitting is still valid.
-    private int missingAlias( MemMergeNode mmm ) {
-        for( int alias=2; alias<mmm.nIns(); alias++ )
-            if( mmm.in(alias)!=null &&
-                mmm.alias(alias)!=mmm.in(1) &&
-                !_aliases.get(alias) )
-                return alias;
-        return 0;
-    }
-
-    // Slice out given alias
-    private MemMergeNode slice( int alias ) {
-        assert !_aliases.get(alias);
-        // Inputs are the same; MemPhi will sharpen his own inputs.  If a
-        // parallel precise Phi already exists, reuse it instead of building a
-        // duplicate for the same Region/alias pair.
-        Node mem = precisePhi(alias);
-        assert ((TypeMem)mem._type)._alias==alias;
-
-        BitSet aliases = ((BitSet)_aliases.clone());
-        aliases.set(alias);
-        BulkMemPhiNode bphi = new BulkMemPhiNode(_label,aliases);
-        for( int i=0; i<nIns(); i++ )
-            bphi.addDef(in(i));
-        // Installing bphi creates a new bulk user with a different exclusion
-        // set.  Queue the original memory inputs before bphi itself can peep
-        // away and hide those neighbor relationships.
-        for( int i=1; i<bphi.nIns(); i++ )
-            CodeGen.CODE.add(bphi.in(i));
-        // Do not peephole bphi here, as BulkMemPhi can recursively start a
-        // second bulk rewrite before this one has finished.  Let the worklist
-        // discover any further splits
-        Node bulk = bphi.init();
-        CodeGen.CODE.add(bulk);
-        CodeGen.CODE.add(mem);
-        return aggregate(bulk,alias,mem);
-    }
-
-    // Build aggregate memory over a bulk Phi, preserving every precise slice
-    // which the bulk has already excluded.  The named alias is newly supplied
-    // (or replaces its old slice).
-    MemMergeNode aggregate(Node bulk, int alias, Node precise) {
-        MemMergeNode mmm = new MemMergeNode(null,bulk);
-        for( int old = _aliases.nextSetBit(0); old >= 0; old = _aliases.nextSetBit(old+1) )
-            { assert old != alias; mmm.alias(old,precisePhi(old));}
-        mmm.alias(alias,precise);
-        assert checkMerge(mmm);
-        mmm.init();
-        // Slicing changes representation, not the set of values in memory.
-        // Newly exposed precise inputs can carry conservative bulk escape
-        // summaries; do not let those invent escapes absent from this Phi.
-        TypeMem old = (TypeMem)_type;
-        TypeMem mem = (TypeMem) mmm._type;
-        mmm._type = TypeMem.make(mem._alias,mem._t,mem._one,mem._clz,
-                                 mem._final,old._escFs,old._escAs);
-        return mmm;
-    }
-
-    // Find or make the precise Phi parallel to this bulk Phi at the same merge.
-    private Node precisePhi(int alias) {
-        MemPhiNode mphi = _findPhi(alias);
-        if( mphi!=null ) return mphi;
-
-        mphi = new MemPhiNode("$"+alias,alias);
-        mphi.addDef(region());
-        // Due to cycles, must set before calling peephole
-        mphi.setType(TypeMem.BOT.makeFrom(alias));
-        for( int i=1; i<nIns(); i++ )
-            mphi.addDef(CodeGen.CODE.add(preciseInput(in(i),alias)));
-        return CodeGen.CODE.add(mphi);
-    }
-
-    MemPhiNode _findPhi(int alias) {
-        for( Node use : region().outs() )
-            if( use instanceof MemPhiNode mphi && mphi._alias==alias )
-                return mphi;
-        return null;
-    }
-
-    // Select an alias already split out of a predecessor's bulk memory.
-    private Node preciseInput(Node mem, int alias) {
-        if( mem instanceof MemMergeNode mmm )
-            return mmm.alias(alias);
-        if( mem instanceof BulkMemPhiNode bulk && bulk.isSplit(alias) )
-            return bulk.precisePhi(alias);
-        return mem;
-    }
-
-    // Every alias excluded by a bulk default must be supplied explicitly.
-    static boolean checkMerge(MemMergeNode mmm) {
-        if( !(mmm.in(1) instanceof BulkMemPhiNode bulk) ) return true;
-        for( int alias = bulk._aliases.nextSetBit(0); alias >= 0; alias = bulk._aliases.nextSetBit(alias+1) )
-            if( alias >= mmm.nIns() || mmm.in(alias)==null )
-                return false;
-        return true;
-    }
-
-    @Override public boolean eq(Node n) {
-        return _aliases.equals(((BulkMemPhiNode)n)._aliases) && super.eq(n);
-    }
-
-    @Override int hash() { return _aliases.hashCode(); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CFGNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/CFGNode.java
deleted file mode 100644
index 4f225fbe..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CFGNode.java
+++ /dev/null
@@ -1,303 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Ary;
-
-import java.util.BitSet;
-import java.util.IdentityHashMap;
-
-/** Control Flow Graph Nodes
- * <p>
- *  CFG nodes have a immediate dominator depth (idepth) and a loop nesting
- *  depth(loop_depth).
- * <p>
- *  idepth is computed lazily upon first request, and is valid even in the
- *  Parser, and is used by peepholes during parsing and afterward.
- * <p>
- *  loop_depth is computed after optimization as part of scheduling.
- *
- *  Start - Block head; has constants and trailing Funs
- *  Region - Block head; has Phis.  Includes Fun and Parms.
- *  CallEnd - Block head; followed by CProj and Proj; also linked RPC Parms
- *  CProj - Block head
- *
- *  If - Block tail; followed by CProj same block
- *  Call - Block tail; followed by CallEnd and linked Funs
- *  New/intrinsic - If followed by CProj: block tail else mid-block; followed by Proj
- *
- */
-public abstract class CFGNode extends Node {
-
-    public CFGNode(Node...   nodes) { super(nodes); }
-    public CFGNode(CFGNode cfg) {
-        super(cfg);
-        if( cfg != null ) {
-            _idepth = cfg._idepth;
-            _idepthVersion = cfg._idepthVersion;
-            _ltree = cfg._ltree;
-            _pre = cfg._pre;
-        }
-    }
-
-    public CFGNode cfg(int idx) { return (CFGNode)in(idx); }
-
-    // Block head is Start, Region, CProj, but not e.g. If, Return, Stop
-    public boolean blockHead() { return false; }
-
-    // Get the one control following; error to call with more than one e.g. an
-    // IfNode or other multi-way branch.
-    public CFGNode uctrl() {
-        CFGNode c = null;
-        for( Node n : _outputs )
-            if( n instanceof CFGNode cfg )
-                {  assert c==null;  c = cfg; }
-        return c;
-    }
-
-    // Used by the encoding / final BB layout
-    public CFGNode uctrlSkipEmpty() {
-        CFGNode x = this, y;
-        while( x.nOuts() == 1 && (y=x.uctrl())!=null && !(y instanceof CallNode) ) // Skip empty blocks
-            x = y;
-        return x;
-    }
-
-    // ------------------------------------------------------------------------
-    /**
-     * Immediate dominator tree depth, used to approximate a real IDOM during
-     * parsing where we do not have the whole program, and also peepholes
-     * change the CFG incrementally.
-     * <p>
-     * See {@link <a href="https://en.wikipedia.org/wiki/Dominator_(graph_theory)">...</a>}
-     */
-    public char _idepth;
-    public char _idepthVersion;
-    public int idepth() { return validIDepth() ? _idepth : cacheIDepth(idom().idepth()+1); }
-    // Zero depth means uncached. Check before narrowing so overflow cannot wrap.
-    final int cacheIDepth(int depth) {
-        assert 0 <= depth && depth <= Character.MAX_VALUE : "Dominator depth exceeds 65535";
-        _idepthVersion = CodeGen.CODE.iDepthVersion();
-        return _idepth = (char)depth;
-    }
-
-    final boolean validIDepth() { return _idepth!=0 && _idepthVersion==CodeGen.CODE.iDepthVersion(); }
-
-
-    // Return the immediate dominator of this Node and compute dom tree depth.
-    public CFGNode idom(Node dep) { return cfg(0); }
-    public final CFGNode idom() { return idom(null); }
-
-    // Return the LCA of two idoms
-    public CFGNode domLCA(CFGNode rhs, Node dep) {
-        if( rhs==null ) return this;
-        CFGNode lhs = this;
-        while( lhs != rhs ) {
-            if( lhs==null || rhs==null ) return null;
-            int comp = lhs.idepth() - rhs.idepth();
-            if( comp >= 0 ) lhs = (dep==null ? lhs : dep.addDep(lhs)).idom();
-            if( comp <= 0 ) rhs = (dep==null ? rhs : dep.addDep(rhs)).idom();
-        }
-        return lhs;
-    }
-
-    // Safe read of the control input of a data node.
-    public static CFGNode safeCFG(Node n) {
-        if( n==null ) return null;
-        if( !(n.in(0) instanceof CFGNode cfg) ) return null;
-        return cfg._safeCFG();
-    }
-    private CFGNode _safeCFG() {
-        return switch(this) {
-        case CLInitNode init when init.bypass() -> init.cfg0()._safeCFG();
-        case CallNode call when call.cend()._folding -> call.cfg0()._safeCFG();
-        case CallEndNode cend when cend._folding -> cend.cfg(1)._safeCFG();
-        case FunNode fun when fun._folding -> fun.cfg(1)._safeCFG();
-        case ReturnNode ret when ret.fun()._folding -> ret.cfg0()._safeCFG();
-        default -> this;
-        };
-    }
-
-    // True when this node dominates `sub` in the current idom tree.
-    public boolean dominates(CFGNode sub, Node dep) {
-        for( CFGNode cfg=sub; cfg!=null; cfg=cfg.idom() )
-            if( cfg == this )
-                return true;
-            else if( dep != null ) dep.addDep(cfg);
-        return false;
-    }
-
-    public static CFGNode deepest(CFGNode a, CFGNode b) {
-        if( a == null ) return b;
-        if( b == null ) return a;
-        return b.idepth() > a.idepth() ? b : a;
-    }
-
-    public static CFGNode earlyCFG(Node n) {
-        return earlyCFG(n,new IdentityHashMap<>(),new BitSet());
-    }
-
-    public static CFGNode earlyCFG(Node n, IdentityHashMap<Node,CFGNode> cache, BitSet active) {
-        if( n == null ) return null;
-        CFGNode cached = cache.get(n);
-        if( cached != null ) return cached;
-        if( active.get(n._nid) )
-            return safeCFG(n);
-        active.set(n._nid);
-        CFGNode early = null;
-        for( Node x : n._inputs )
-            early = deepest(early,defCFG(x,cache,active));
-        active.clear(n._nid);
-        cache.put(n,early);
-        return early;
-    }
-
-    private static CFGNode defCFG(Node n, IdentityHashMap<Node,CFGNode> cache, BitSet active) {
-        if( n == null || n.isConst() )  return null; // no impact on early cfg
-        return switch( n ) {
-        case PhiNode phi -> phi.region();
-        case CFGNode cfg -> cfg;
-        case ProjNode projNode -> safeCFG( n );
-        default -> earlyCFG( n, cache, active );
-        };
-    }
-
-    public boolean sameFun(CFGNode that) {
-        FunNode fun = fun();
-        return fun != null && fun == that.fun();
-    }
-
-    // Find nearest enclosing FunNode
-    public FunNode fun() {
-        CFGNode cfg = this;
-        while( !(cfg instanceof FunNode fun) ) {
-            if( cfg==null ) return null;
-            cfg = cfg.idom();
-        }
-        return fun;
-    }
-
-    // ------------------------------------------------------------------------
-    // Loop nesting
-    public LoopNode loop() { return _ltree._head; }
-    public int loopDepth() { return _ltree==null ? 0 : _ltree.depth(); }
-
-    public LoopTree _ltree;
-    public int _pre;            // Pre-order numbers for loop tree finding
-    public static class LoopTree {
-        public LoopTree _par;
-        public final LoopNode _head;
-        public int _depth;
-        LoopTree(LoopNode head) { _head = head; }
-        @Override public String toString() { return label(_head); }
-        public int depth() {
-            return _depth==0 ? (_par==null ? 0 : (_depth = _par.depth()+1)) : _depth;
-        }
-    }
-
-    // ------------------------------------------------------------------------
-    // Tag all CFG Nodes with their containing LoopNode; LoopNodes themselves
-    // also refer to *their* containing LoopNode, as well as have their depth.
-    // Start contains the function bodies at depth 0; real loops add depth.
-    public void buildLoopTree( Ary<FunNode> funs, StopNode stop) {
-        _ltree = stop._ltree = CodeGen.CODE.XCTRL._ltree = new LoopTree((StartNode)this);
-        Ary<FunNode> work = new Ary<>(FunNode.class);
-
-        BitSet post = new BitSet();
-        int pre = 1;
-        _pre = pre++;
-        for( FunNode fun : funs ) {
-            if( fun!=null && !fun.isDead() && !fun._type.isHigh() ) {
-                work.push(fun);
-                if(fun.in(1) instanceof StartCUNode start && start._pre==0 ) {
-                    start._pre = pre++;
-                    start._ltree = start.cfg(1)._ltree = _ltree;
-                    post.set(start._nid);
-                }
-            };
-        }
-
-        for( int i=0; i<work._len; i++ )
-            pre = work.at(i)._bltWalk(pre,work.at(i),stop, post, work);
-    }
-
-    int _bltWalk( int pre, FunNode fun, StopNode stop, BitSet post, Ary<FunNode> work ) {
-        // Pre-walked?
-        if( _pre!=0 ) return pre;
-        _pre = pre++;
-        // Seed the function's outer tree before walking its body.  Synthetic
-        // exits can be added before the post-order walk reaches the entry.
-        if( this instanceof FunNode ) _ltree = stop._ltree;
-        if( this instanceof ReturnNode ) {
-            _ltree = fun._ltree;
-            post.set(_nid);
-            return pre; // Stop/Start links describe the outside world, not a loop.
-        }
-        // Pre-walk
-        for( Node use : _outputs )
-            if( use instanceof CFGNode usecfg ) {
-                if( skip( usecfg ) ) {
-                    if( usecfg._pre==0 && usecfg instanceof FunNode fun2 ) work.add( fun2 );
-                } else
-                    pre = usecfg._bltWalk( pre, use instanceof FunNode fuse ? fuse : fun, stop, post, work );
-            }
-
-        // Post-order work: find innermost loop
-        LoopTree inner = null, ltree;
-        for( Node use : _outputs ) {
-            if( !(use instanceof CFGNode usecfg) ) continue;
-            if( skip(usecfg) ) continue;
-            if( usecfg._type == Type.XCONTROL ||       // Do not walk dead control
-                usecfg._type == TypeTuple.IF_NEITHER ) // Nor dead IFs
-                continue;
-            // Child visited but not post-visited?
-            if( !post.get(usecfg._nid) ) {
-                // Must be a backedge to a LoopNode then
-                ltree = usecfg._ltree = new LoopTree((LoopNode)usecfg);
-            } else {
-                // Take child's loop choice, which must exist
-                ltree = usecfg._ltree;
-                // If falling into a loop, use the target loop's parent instead
-                if( ltree._head == usecfg ) {
-                    if( ltree._par == null )
-                        // This loop never had an If test choose to take its
-                        // exit, i.e. it is a no-exit infinite loop.
-                        ltree._par = ltree._head.forceExit(fun,stop)._ltree;
-                    ltree = ltree._par;
-                }
-            }
-            // Sort inner loops.  The decision point is some branch far removed
-            // from either loop head OR either backedge so requires pre-order
-            // numbers to figure out innermost.
-            if( inner == null ) { inner = ltree; continue; }
-            if( inner == ltree ) continue; // No change
-            LoopTree outer = ltree._head._pre > inner._head._pre ? inner : ltree;
-            inner =          ltree._head._pre > inner._head._pre ? ltree : inner;
-            inner._par = outer;
-        }
-        // Set selected loop
-        if( inner!=null )
-            _ltree = inner;
-        // Tag as post-walked
-        post.set(_nid);
-        return pre;
-    }
-
-    public boolean skip(CFGNode usecfg) {
-        // Only walk control users that are alive.
-        // Do not walk from a Call to linked Fun's.
-        return usecfg instanceof XCtrlNode ||
-                (this instanceof CallNode && usecfg instanceof FunNode) ||
-                (this instanceof ReturnNode && usecfg instanceof CallEndNode);
-    }
-
-    public static String label( CFGNode target ) {
-        return switch(target) {
-        case StartNode start -> start.label();
-        case FunNode fun -> fun.label();
-        case LoopNode loop -> "LOOP"+target._nid;
-        default -> "L"+target._nid;
-        };
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CLInitNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/CLInitNode.java
deleted file mode 100644
index 0a0de3cf..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CLInitNode.java
+++ /dev/null
@@ -1,165 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.CompUnit;
-import com.seaofnodes.simple.type.*;
-import java.util.*;
-
-// Track class initializers - the code just after this point expects the named
-// class to be initialized.  If this code path dies, then the dependency dies
-// also - dead code does not force class init.
-//
-public class CLInitNode extends CFGNode implements MultiNode {
-    public Parser.Lexer _loc;          // For error reporting
-
-    // Inputs: control, whole memory, class pointer, loaded $init flag
-    // Results: control, whole memory, known-true flag alias memory.
-    // For field references, the ptr might be the dst clz ptr or not.
-    public CLInitNode(Parser.Lexer loc, Node ctrl, Node mem, Node ptr, Node ready) {
-        super(ctrl,mem,ptr,ready);
-        _loc = loc;
-    }
-
-
-    public CLInitNode(CLInitNode init) {
-        super(init);
-        _loc = init._loc;
-    }
-
-    public Node mem() { return in(1); }
-    public Node ptr() { return in(2); }
-    public Node ready() { return in(3); }
-
-    // The field/alias can be unresolved until forward references are loaded.
-    public Field flag() {
-        return ptr()._type instanceof TypeMemPtr tmp && Parser.startsClzPrefix(tmp._obj._name)
-            ? tmp._obj.field("$init") : null;
-    }
-    @Override public String label() { return "CLInit"; }
-
-    // Best effort dst compunit, based on ptr - or null
-    public CompUnit cu() {
-        if( !(ptr()._type instanceof TypeMemPtr ptr && Parser.startsClzPrefix(ptr._obj._name)) )
-            return null;
-        // Convert "class:sys.ary" into "sys/ary" and lookup CompUnit
-        String fname = ptr._obj._name.substring(6).replace(".","/");
-        return CodeGen.CODE._compunits.get(fname);
-    }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        FunNode fun = fun();
-        CompUnit cu = cu();
-        return p.p("CLInit ").p(fun._name).p(" -> ").p(cu==null ? "---" : cu._cname);
-    }
-
-    // Block head is Start, Region, CProj, but not e.g. If, Return, Stop
-    public boolean blockHead() { return true; }
-
-    private boolean instance() {
-        return ptr()._type==Type.NIL ||
-            (ptr()._type instanceof TypeMemPtr tmp && tmp._obj!=TypeStruct.BOT &&
-             !tmp._obj.isHigh() && !tmp._obj._open && !tmp._obj._fref &&
-             !Parser.startsClzPrefix(tmp._obj._name));
-    }
-
-    public boolean bypass() { return instance() || ready()._type==TypeInteger.TRUE; }
-
-    @Override public Type compute() {
-        if( in(0)._type.isHigh() || ptr()._type.isHigh() )
-            return TypeTuple.make(Type.XCONTROL,TypeMem.TOP,TypeMem.TOP);
-        if( instance() )
-            return TypeTuple.make(in(0)._type,mem()._type,mem()._type);
-        Field flag = flag();
-        Type slice = flag==null ? TypeMem.BOT : TypeMem.make(flag._alias,TypeInteger.TRUE);
-        // The initializer may write arbitrary public memory. Only its flag
-        // has a guaranteed value on the normal continuation.
-        Type bulk = ready()._type.isHigh() ? TypeMem.TOP :
-            ready()._type==TypeInteger.TRUE ? mem()._type : TypeMem.BOT;
-        return TypeTuple.make(in(0)._type,bulk,slice);
-    }
-
-    @Override public Node pcopy(int idx, Node dep) {
-        dep.addDep(ptr());
-        dep.addDep(ready());
-        if( instance() ) return idx==0 ? in(0) : mem();
-        if( ready()._type!=TypeInteger.TRUE ) return null;
-        if( idx==0 ) return in(0);
-        if( idx==1 ) return mem();
-        // Already established on the incoming path; this is a memory fact,
-        // not a new store to the class object.
-        return CodeGen.CODE.con(((TypeTuple)_type)._types[2]);
-    }
-
-    @Override public Node idealize() {
-        if( CodeGen.CODE._phase!=CodeGen.Phase.Lower || bypass() || in(0)._type.isHigh() ) return null;
-        if( CodeGen.CODE._midAssert ) return this;
-        // Until entry arguments become arrays, ordinary initializers receive zero.
-        return expand(CodeGen.CODE.con(TypeInteger.ZERO));
-    }
-
-    // Called only after cycle/type checking. The initialized arm skips the
-    // call; both arms rejoin with whole memory and a known-true flag slice.
-    private Node expand(Node arg) {
-        FunNode target = CodeGen.CODE.link(cu());
-        assert target!=null && !target.isDead();
-        keep();
-        Node ctrl = in(0);
-        Node memory = mem();
-
-        // A child body may assume its parent has finished. Establish that
-        // requirement first, then test the child's flag in the resulting memory.
-        CompUnit parent = cu()._par;
-        if( parent!=null ) {
-            Node ptr = CodeGen.CODE.con(TypeMemPtr.make((byte)2,parent._clz,true));
-            Field flag = parent._clz.field("$init");
-            Node off = CodeGen.CODE.con(parent._clz.offset(parent._clz.find("$init")));
-            Node parentReady = CodeGen.CODE.add(new LoadNode(_loc,"$init",flag._alias,ctrl,memory,ptr,off).init());
-            CLInitNode init = CodeGen.CODE.add(new CLInitNode(_loc,ctrl,memory,ptr,parentReady).init());
-            ctrl = CodeGen.CODE.add(new CProjNode(init,0,ScopeNode.CTRL).init());
-            memory = CodeGen.CODE.add(new ProjNode(init,1,ScopeNode.MEM0).init());
-        }
-
-        Node childOff = CodeGen.CODE.con(cu()._clz.offset(cu()._clz.find("$init")));
-        // Read the child's flag after establishing its parent's memory effects.
-        Node ready = CodeGen.CODE.add(new LoadNode(_loc,"$init",flag()._alias,ctrl,memory,ptr(),childOff).init());
-
-        IfNode iff = CodeGen.CODE.add(new IfNode(ctrl,ready).init());
-        Node done = CodeGen.CODE.add(new CProjNode(iff,0,"True").init());
-        Node cold = CodeGen.CODE.add(new CProjNode(iff,1,"False").init());
-
-        Node fptr = new FunPtrNode(target.sig(),CodeGen.CODE._start,target.ret()).peephole();
-        CallNode call = CodeGen.CODE.add(new CallNode(_loc,cold,memory,ptr(),arg,fptr).init());
-        CallEndNode end = new CallEndNode(call,TypeRPC.constant(CodeGen.CODE.rpc(_loc._cu._cname)));
-        // This is a lowered call, after interprocedural analysis. Do not add
-        // new parameter flows to a body already optimized by SCCP.
-        CodeGen.CODE.add(end.init());
-        Node called = CodeGen.CODE.add(new CProjNode(end,0,ScopeNode.CTRL).init());
-        Node after = CodeGen.CODE.add(new ProjNode(end,1,ScopeNode.MEM0).init());
-        RegionNode region = CodeGen.CODE.add(new RegionNode(_loc,null,done,called).init());
-        Node merged = CodeGen.CODE.add(new BulkMemPhiNode(ScopeNode.MEM0,region,memory,after).init());
-
-        // Replace the individual outputs; no tuple-pack node or second
-        // representation of CLInit is needed while the projections collapse.
-        for( Node use : _outputs.asAry() ) {
-            if( use==null ) continue; // Our temporary keep.
-            assert use instanceof Proj;
-            int idx = ((Proj)use).idx();
-            use.subsume(idx==0 ? region : idx==1 ? merged : CodeGen.CODE.con(((TypeTuple)_type)._types[2]));
-        }
-        CodeGen.CODE.invalidateIDepthCaches();
-        return unkeep(); // Iter removes this now-unused node.
-    }
-
-    // Resolve a precise flag slice even when the parser did not yet know the
-    // class/alias and could only install the whole-memory projection.
-    static Node slice(Node mem, int alias, Node dep) {
-        if( !(mem instanceof ProjNode proj && proj._idx==1 && proj.in(0) instanceof CLInitNode init) )
-            return mem;
-        dep.addDep(init.ptr());
-        Field flag = init.flag();
-        if( flag==null || flag._alias!=alias ) return mem;
-        return new ProjNode(init,2,Parser.memName(alias)).peephole();
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CProjNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/CProjNode.java
deleted file mode 100644
index 2bd48d92..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CProjNode.java
+++ /dev/null
@@ -1,73 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeTuple;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-public class CProjNode extends CFGNode implements Proj {
-
-    // Which slice of the incoming multipart value
-    public int _idx;
-
-    // Debugging label
-    public String _label;
-
-    public CProjNode(Node ctrl, int idx, String label) {
-        super(ctrl);
-        _idx = idx;
-        _label = label;
-    }
-    public CProjNode(CProjNode c) { super(c); _idx = c._idx; _label = c._label; }
-
-
-    @Override public String label() { return _label; }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) { return p.p(_label); }
-
-    @Override public boolean blockHead() { return true; }
-
-    public CFGNode ctrl() { return cfg(0); }
-
-    @Override
-    public Type compute() {
-        Type t = ctrl()._type;
-        return t instanceof TypeTuple tt ? tt._types[_idx] : (t.isHigh() ? Type.TOP : Type.BOTTOM);
-    }
-
-    @Override
-    public Node idealize() {
-        if( ctrl()._type instanceof TypeTuple tt ) {
-            if( tt._types[_idx]==Type.XCONTROL )
-                return CodeGen.CODE.XCTRL; // We are dead
-            if( ctrl() instanceof IfNode && tt._types[1-_idx]==Type.XCONTROL ) // Only true for IfNodes
-                return ctrl().in(0);               // We become our input control
-        }
-
-        // Flip a negating if-test, to remove the not
-        if( ctrl() instanceof IfNode iff && iff.pred() != null && addDep(iff.pred()) instanceof NotNode not )
-            return new CProjNode(new IfNode(iff.ctrl(),not.in(1)).peephole(),1-_idx,_idx==0 ? "False" : "True");
-
-        // Copy of some other input
-        return ((MultiNode)ctrl()).pcopy(_idx,this);
-    }
-
-    // Only called during basic-block layout, inverts a T/F CProj
-    public void invert() {
-        _label = _idx == 0 ? "False" : "True";
-        _idx = 1-_idx;
-    }
-
-    @Override
-    public boolean eq( Node n ) { return _idx == ((CProjNode)n)._idx; }
-
-    @Override
-    int hash() { return _idx; }
-
-    @Override public int idx() { return _idx; }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CallEndMach.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/CallEndMach.java
deleted file mode 100644
index 05707132..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CallEndMach.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.util.SB;
-
-public class CallEndMach extends CallEndNode implements MachNode {
-    public CallEndMach( CallEndNode n ) { super(n); }
-    // MachNode specifics, shared across all CPUs
-    public int _xslot;
-    private RegMask _retMask;
-    private RegMask _kills;
-    public void cacheRegs(CodeGen code) {
-        // Return mask depends on TFP (either GPR or FPR)
-        _retMask = code._mach.retMask(call().tfp());
-        // Kill mask is all caller-saves, and any mirror stack slots for args
-        // in registers.
-        RegMaskRW kills = (call().external() ? code._cCallerSave : code._callerSave).copy();
-        // Start of stack slots
-        int maxReg = code._mach.regs().length;
-        // Incoming function arg slots, all low numbered in the RA
-        int fslot = fun()._maxArgSlot;
-        // Killed slots for this calls outgoing args
-        int xslot = call().external()
-            ? code._mach.maxArgSlot(call().tfp(),code._cCallingConv)
-            : code._mach.maxArgSlot(call().tfp());
-        _xslot = (maxReg+fslot)+xslot;
-        for( int i=0; i<xslot; i++ )
-            kills.set((maxReg+fslot)+i);
-        _kills = kills;
-    }
-    public String op() { return "cend"; }
-    public RegMask regmap(int i) { return null; }
-    public RegMask outregmap() { return null; }
-    public RegMask outregmap(int idx) { return idx==2  ? _retMask : null; }
-    public RegMask killmap() { return _kills; }
-    public void encoding( Encoding enc ) { }
-    public void asm(CodeGen code, SB sb) {  }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CallEndNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/CallEndNode.java
deleted file mode 100644
index 4422265f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CallEndNode.java
+++ /dev/null
@@ -1,321 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.type.*;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-/**
- *  CallEnd
- */
-public class CallEndNode extends CFGNode implements MultiNode {
-
-    // When set true, this Call/CallEnd/Fun/Return is being trivially inlined
-    boolean _folding;
-    // +2: must clone, so await all cleanup but OK
-    // +1: trivial now, so can inline without cloning and without waiting for cleanup
-    //  0: take a look,
-    // -1: somethings wrong, but might improve
-    // -2: never and stop asking,
-    private byte _inline;
-    public final TypeRPC _rpc;
-
-    public CallEndNode(CallNode call, TypeRPC rpc) {
-        super(new Node[]{call});
-        _rpc = rpc;
-    }
-    public CallEndNode(CallEndNode cend) { super(cend); _rpc = cend._rpc; }
-    public CallEndNode(TypeRPC rpc) {
-        super(new Node[0]);
-        _rpc = TypeRPC.constant(CodeGen.CODE._rpcs.next(rpc.rpc()));
-    }
-    private CallEndNode(int nIns, TypeRPC rpc) {
-        super(new Node[nIns]);
-        _rpc = rpc;
-    }
-
-
-    @Override public boolean blockHead() { return true; }
-
-    public CallNode call() { return (CallNode)in(0); }
-    public boolean folding() { return _folding; }
-
-    @Override public CFGNode idom(Node dep) {
-        // Folding the idom is the one inlining Return
-        return _folding ? cfg(1) : super.idom(dep);
-    }
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        p.p("cend( ");
-        p.p( in(0) instanceof CallNode ? "Call, " : "----, ");
-        for( int i=1; i<nIns()-1; i++ )
-            p.n(in(i)).p(",");
-        return p.unchar(',').unchar(' ').close();
-    }
-
-    @Override
-    public Type compute() {
-        if( !(in(0) instanceof CallNode call) || call._type != Type.CONTROL )
-            return TypeTuple.STATE.dual();
-        // Grab the TFP and use the functions declared return type.
-        // If the call.fptr() is a FRef, return will be BOTTOM.
-        Type ftype = addDep(call.fptr())._type;
-        if( !(ftype instanceof TypeFunPtr tfp) )
-            return ftype.isHigh() ? TypeTuple.STATE.dual() : TypeTuple.STATE;
-        // Mid-fold, just take the one single callers' return type
-        if( _folding ) {
-            TypeTuple tt = (TypeTuple)in(1)._type;
-            return tt.makeFrom(2,tt.ret());
-        }
-
-        // Here, if I can figure out I've linked *all* callers, then I can meet
-        // across the linked returns and join with the function return type.
-
-        // External functions have an exact FIDX but deliberately no local
-        // FunNode/Return edge.  They conservatively crush public memory and
-        // produce their declared return type.  A missing non-external target
-        // is still an unresolved/error call.
-        int externs = 0;
-        // The signature bounds widening (e.g. an i32 result stays i32).
-        // Use the callee signature, not FunPtrNode's live recursive range.
-        Type bound = tfp.ret();
-        if( !XInt.isHigh(tfp.fidxs()) ) {
-            bound = Type.TOP;
-            for( int fidx = XInt.next(tfp.fidxs(),0); fidx >= 0; fidx = XInt.next(tfp.fidxs(),fidx) ) {
-                if( CodeGen.CODE.externFunc(fidx)!=null )
-                    externs++;
-                FunNode fun = CodeGen.CODE._link(fidx);
-                bound = bound.meet(fun==null ? tfp.ret() : addDep(fun).sig().ret());
-            }
-        }
-        boolean hasExtern = externs != 0;
-
-        // If we have an error-call, e.g. wrong args, then we never link.
-        // Pre-Opto this looks like a missing target fcn, and we assume it will
-        // appear later - meanwhile, we use a conservative approx of memory
-        // effects.
-        if( (nIns()-1)+externs < tfp.nfcns() ) {
-            // If during Opto, assume call won't be called and thus won't return anything.
-            // Lowered calls deliberately have no links into optimized bodies.
-            boolean opto = CodeGen.CODE._phase.ordinal() >= CodeGen.Phase.Opto.ordinal() &&
-                           CodeGen.CODE._phase.ordinal() <  CodeGen.Phase.Lower.ordinal();
-            Type tmem = opto ? TypeMem.TOP : TypeMem.BOT;
-            Type ret  = opto ? Type.TOP    : tfp.ret();
-            // Use the same widening before and after linking a callee.
-            return TypeTuple.make(Type.CONTROL,tmem,widenResult(ret,bound));
-        }
-
-        // A linked function for every concrete function
-        TypeTuple state = hasExtern
-            ? TypeTuple.make(Type.CONTROL,call.exposed(this),tfp.ret())
-            : TypeTuple.STATE.dual();
-        for( int i=1; i<nIns(); i++ )
-            state = (TypeTuple)state.meet(in(i)._type);
-        // A reachable call whose presently linked exits are all unreachable
-        // keeps a conservative continuation.  In particular, do not let a
-        // transient no-return result tear down the caller before/during SCCP.
-        // If the call remains out-of-line, its continuation can conservatively
-        // contribute class-init dependencies even though it never executes.
-        if( state.ctl()==Type.XCONTROL )
-            return TypeTuple.make(Type.CONTROL,TypeMem.TOP,Type.TOP);
-        // Join before widening: FunPtrNode follows the live Return type, so
-        // joining it afterward would undo the widening.
-        return state.makeFrom(2,widenResult(state.ret().join(tfp.ret()),bound));
-    }
-
-    private static Type widenResult(Type ret, Type bound) {
-        // Recursion is a loop in disguise. For f(x-1)+1, the result
-        // flows Return -> CallEnd -> Add -> Phi -> Return, without
-        // crossing ParmNode.compute's widening point. Widen here too,
-        // using the loop rule in PhiNode.compute. Keep constants and
-        // above-center ranges narrow.
-        if( ret instanceof TypeInteger ti && !ti.isHigh() && !ti.isConstant() )
-            ret = ti.same_but_slightly_wider_than().join(bound);
-        return ret;
-    }
-
-    @Override
-    public Node idealize() {
-        return null;
-    }
-
-    public byte maybeInline() {
-        byte inline = inlineCandidate();
-        if( CodeGen.CODE._midAssert )
-            return inline;
-        _inline = inline;
-        if( _inline > 0 )
-            doInline();
-
-        return _inline;
-    }
-
-    // Check if candidate right now, sets no flags
-    private byte inlineCandidate() {
-        if( _inline < -2 ) return -2; // Never
-        if( _folding ) return -2;     // No, and will collapse anyways
-        if( !(in(0) instanceof CallNode call) ) return -2; // malformed because mid-death
-
-        if( nIns()!=2 ) return -1;    // Not exactly 1 link, but can change
-
-        // Have exactly 1 linked function
-        ReturnNode ret = (ReturnNode)in(1);
-        FunNode fun = ret.fun();
-
-        // Preserve initializer boundaries until post-Opto cycle validation.
-        if( fun.isClz() ) return -2;
-
-        // Heuristic forced inlining turned off via name
-        if( fun._name != null &&
-            fun._name.endsWith("_noInline") )
-            return -2;          // Never, stop asking
-
-        // Disallow self-recursive inlining (loop unrolling by another name).
-        for( int i=1; i < fun.nIns(); i++ )
-            if( fun.cfg(i).fun()==fun ) // Check for linked call input inside "fun"
-                { addDep(fun); return -1; } // No, but can lose the recursive edge
-
-        // Things that might improve, but not now a candidate
-        Node fptr = call.fptr();
-        // Constant Function is being called, and its not-null
-        if( !(fptr._type instanceof TypeFunPtr tfp && tfp.notNull() && tfp.isConstant()) )
-            { addDep(fptr); return -1; }
-
-        // Arguments are correct
-        if( call.nargs()!=tfp.nargs() || !goodArgs(call,tfp) )
-            { addDep(fptr); return -1; }
-
-        // Encouraged inlining because small size and constructor.
-        int maxSize = fun.inlineLimit();
-        // A large parse can leave only a tiny initializer.  Recognize that
-        // and await cleanup to shrink the body.
-        if( fun._approxUIDs >= maxSize ) {
-            if( !smallBody(fun) ) return -1;
-        } else if( fun.body().cardinality() >= maxSize ) // Expensive size check
-            return -1;          // Try later (if cleanup makes the real body small enough)
-
-        // Can be cloned but not trivial
-        if( fun.nIns() > 2 ) { addDep(fun); return 2; }
-
-        // A trivial candidate right now
-        return 1;
-    }
-
-    // Bounded, conservative recognition of straight-line initializer boilerplate.
-    // Walk uses from the entry and stop at Return, never following callers or
-    // constant inputs.  This also avoids scanning sparse MemMerge input arrays.
-    // Watch only this small prefix, including an unsupported node that may fold.
-    private static final Node[] TINYBODY = new Node[15]; // Tiny worklist
-    private boolean smallBody(FunNode fun) {
-        ReturnNode ret = fun.ret();
-        for( Node in : ret._inputs )
-            if( in!=null ) addDep(in);
-        if( ret.ctrl()!=fun ) return false;
-        TINYBODY[0] = fun;
-        int len=1;
-        for( int i=0; i<len; i++ ) {
-            Node n = TINYBODY[i];
-            addDep(n);
-            if( n==ret ) continue;
-            if( n instanceof ParmNode parm && parm.region()!=fun ) return false;
-            if( n!=fun && !(n instanceof ParmNode) &&
-                !(n instanceof StoreNode) && !(n instanceof MemMergeNode) )
-                return false;                             // Something unexpected
-            if( n.nOuts()>TINYBODY.length ) return false; // Too big
-            for( Node use : n._outputs ) {
-                if( use==null ) continue;
-                int j=0;
-                while( j<len && TINYBODY[j]!=use ) j++;
-                if( j<len ) continue; // Already in TINYBODY
-                if( len==TINYBODY.length ) { addDep(use); return false; } // Too big
-                TINYBODY[len++] = use;  // Add to worklist
-            }
-        }
-        return true;
-    }
-
-    public void doInline() {
-        assert _inline > 0;    // Only called when possible to inline
-
-        ReturnNode ret = (ReturnNode)in(1);
-        FunNode fun = ret.fun();
-        CallNode call = call();
-        assert fun.sig().isa(call.fptr()._type);
-
-        // Clone first
-        if( _inline==2 ) {
-            assert !CodeGen.CODE._midAssert; // Triggered inlining
-            // Remove the existing function linkage
-            call.unlink_all();
-            // Clone the function body
-            FunNode fun2 = fun.copyBody();
-            // Call uses the unique new function
-            Node fptr2 = new FunPtrNode(fun2.sig(),CodeGen.CODE._start,fun2.ret()).peephole();
-            call.setDef(call.nIns()-1,fptr2);
-            // Link to the new function
-            call.link(fun2);
-            fun = fun2;
-        }
-
-        // Trivial inlining: call site calls a single function; single function
-        // is only called by this call site.
-        doTrivialInlining(fun);
-    }
-
-    boolean goodArgs( CallNode call, TypeFunPtr tfp ) {
-        for( int i=0; i<tfp.nargs(); i++ ) {
-            Node arg = call.arg(i+2);
-            // The graph's function-pointer type can still contain open forward
-            // references here.  Compare against its recursively upgraded form,
-            // so deep mutability requirements participate before inlining.
-            Type formal = tfp.arg(i).upgradeType(Parser.TYPES);
-            if( !arg._type.isa(formal) || !arg._type.accessISA(formal) )
-                { addDep(arg); return  false; }
-        }
-        return true;
-    }
-
-
-    // Do trivial inlining.  Inlining does not need to clone code, merely
-    // triggers folding the Call/Fun and Return/CallEnd away.
-    private boolean doTrivialInlining( FunNode fun ) {
-        assert !CodeGen.CODE._midAssert; // Triggered inlining
-        // Trivial inline: rewrite
-        _folding = true;
-        // Rewrite Fun so the normal RegionNode ideal collapses
-        fun._folding = true;
-        fun.setDef(1,call().ctrl());// Bypass the Call;
-        fun.ret().setDef(3,null);   // Return is folding also
-
-        CodeGen.CODE.addAll(fun._outputs);
-        // Repeat defs 1 layer down, for users of Parm (Phis)
-        for( Node parm : fun._outputs )
-            if( parm instanceof ParmNode )
-                CodeGen.CODE.addAll(parm._outputs);
-
-        // Inlining immediately blows all cache idepth fields past the inline point.
-        // Bump the global version number invalidating them en-masse.
-        CodeGen.CODE.invalidateIDepthCaches();
-        // More peeps
-        CodeGen.CODE.add(fun);
-        CodeGen.CODE.add(this);
-        CodeGen.CODE.addAll(_outputs);
-        CodeGen.CODE.addAll(_inputs);
-        return true;            // Always return true
-    }
-
-
-    @Override public Node pcopy(int idx, Node dep) {
-        return _folding ? in(1).in(idx) : null;
-    }
-
-    @Override public Node copy() {
-        return _folding ? super.copy() : new CallEndNode(_rpc);
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CallNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/CallNode.java
deleted file mode 100644
index f791225a..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CallNode.java
+++ /dev/null
@@ -1,220 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeFunPtr;
-import com.seaofnodes.simple.type.TypeMem;
-import com.seaofnodes.simple.type.TypeRPC;
-import com.seaofnodes.simple.type.XInt;
-import com.seaofnodes.simple.util.Utils;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-/**
- *  Call
- */
-public class CallNode extends CFGNode {
-
-    // Source location for late reported errors
-    public final Parser.Lexer _loc;
-
-    public CallNode(Parser.Lexer loc, Node... nodes) { super(nodes); _loc=loc; CodeGen.CODE._calls.add(this); }
-    public CallNode(CallNode call) { super(call); _loc = call._loc; }
-
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        String fname = name();
-        if( fname == null ) p.n(fptr());
-        else p.p(fname);
-        p.p("( ");
-        for( int i=2; i<nIns()-1; i++ )
-            p.n(in(i)).p(",");
-        return p.unchar(',').unchar(' ').close();
-    }
-    public String name() {
-        if( fptr()._type instanceof TypeFunPtr tfp && tfp._isConstant() && tfp.notNull() ) {
-            FunNode fun = CodeGen.CODE._link(tfp);
-            if( fun !=null ) return fun._name;
-            if( fptr() instanceof ExternNode ex )  return ex._extern;
-        }
-        return null;
-    }
-
-
-    Node ctrl() { return in(0); }
-    Node mem () { return in(1); }
-    // Args mapped 1-to-1 on inputs, so conceptually start at 2
-    public Node arg(int idx) { return in(idx); }
-    // Same arg accounting as TFPs, although the numbering starts at 2
-    public int nargs() { return nIns()-3; } // Minus control, memory, fptr
-    // args from input 2 to last; last is function input
-    public Node fptr() { return _inputs.last(); }
-    // Error if not a TFP
-    public TypeFunPtr tfp() { return (TypeFunPtr)fptr()._type; }
-
-    // Call is to an externally supplied code
-    public boolean external() {
-        if( !(fptr()._type instanceof TypeFunPtr tfp) ) return false;
-        if( XInt.isHigh(tfp.fidxs()) ) return true;
-        for( int fidx=XInt.next(tfp.fidxs(),-1); fidx>=0; fidx=XInt.next(tfp.fidxs(),fidx) )
-            if( CodeGen.CODE.externFunc(fidx)!=null ) return true;
-        return false;
-    }
-
-    // As in the escape chapter, native code may retain an argument even if
-    // this path never returns. StopCU reads this independently of CallEnd.
-    TypeMem exposed(Node dep) {
-        dep.addDepForwards(this);
-        dep.addDepForwards(fptr());
-        if( _type!=Type.CONTROL || !external() ) return TypeMem.START;
-        Type input=dep.addDepForwards(mem())._type;
-        TypeMem escaped=input instanceof TypeMem m ? m : input.isHigh() ? TypeMem.TOP : TypeMem.BOT;
-        for( int i=2; i<nIns()-1; i++ ) escaped=escaped.escapes(dep.addDepForwards(arg(i))._type);
-        return TypeMem.make(1,Type.BOTTOM,false,false,false,escaped._escFs,escaped._escAs);
-    }
-
-
-    // Find the Call End from the Call
-    public CallEndNode cend() {
-        // Always in use slot 0
-        if( nOuts()>0 && out(0) instanceof CallEndNode cend ) {
-            assert _cend()==cend;
-            return cend;
-        } else {
-            assert _cend()==null;
-            return null;
-        }
-    }
-    private CallEndNode _cend() {
-        CallEndNode cend=null;
-        for( Node n : _outputs )
-            if( n instanceof CallEndNode cend0 )
-                { assert cend == null; cend = cend0; }
-        return cend;
-    }
-
-    // Get the one control following; error to call with more than one e.g. an
-    // IfNode or other multi-way branch.
-    @Override public CFGNode uctrl() { return cend(); }
-
-
-    @Override
-    public Type compute() {
-        return ctrl()._type;
-    }
-
-    @Override
-    public Node idealize() {
-        // Lowering may introduce calls after the call graph has been analyzed.
-        // These use the callee interface without reopening its parameter flow.
-        if( CodeGen.CODE._phase.ordinal() >= CodeGen.Phase.Lower.ordinal() ) return null;
-        CallEndNode cend = cend();
-        if( cend==null ) return null; // Still building
-
-        // Link: call calls target function.  Linking makes the target FunNode
-        // point to this Call, and all his Parms point to the call arguments;
-        // also the CallEnd points to the Return.
-        Node progress = null;
-        if( fptr()._type instanceof TypeFunPtr tfp && tfp.nargs() == nargs() ) {
-            // If fidxs is negative, then infinite unknown functions
-            int[] fidxs = tfp.fidxs();
-            if( !XInt.isHigh(fidxs) ) {
-                // Walk the bits and link
-                for( int fidx = XInt.next(fidxs,0); fidx > 0; fidx = XInt.next(fidxs,fidx) ) {
-                    FunNode fun = CodeGen.CODE.link(fidx);
-                    if( fun!=null && !fun._folding && !linked(fun) )
-                        progress = link(fun);
-                }
-            }
-        }
-
-        return progress;
-    }
-
-    // True if Fun is linked to this Call
-    public boolean linked( FunNode fun ) {
-        for( Node n : fun._inputs )
-            if( n == this )
-                return true;
-        return false;
-    }
-
-    // Link so this calls fun
-    public Node link( FunNode fun ) {
-        assert !linked(fun);
-        CodeGen.CODE.add(fun).addDef(this);
-        for( Node use : fun._outputs )
-            if( use instanceof ParmNode parm ) {
-                Node def = parm._idx==0 ? ConstantNode.seed(cend()._rpc).peephole() : arg(parm._idx);
-                CodeGen.CODE.add(parm).addDef(def);
-                // Linking can happen during post-SCCP inlining.  Keep an RPC
-                // Parm's cached finite set synchronized with its newly added
-                // input instead of waiting for the next worklist visit.
-                if( parm._idx==0 && parm._type instanceof TypeRPC )
-                    parm._type = parm._type.meet(def._type);
-            }
-        // Call end points to function return
-        CodeGen.CODE.add(cend()).addDef(fun.ret());
-        return this;
-    }
-
-    // Unlink a single function
-    public void unlink( FunNode fun, int path ) {
-        assert linked(fun);
-        for( Node use : fun._outputs )
-            if( use instanceof ParmNode )
-                use.delDef(path);
-        fun.delDef(path);
-        CodeGen.CODE.add(fun);
-        CallEndNode cend = cend();
-        ReturnNode ret = fun.ret();
-        if( cend != null ) {
-            ret.keep();
-            cend.delDef(cend._inputs.find(ret));
-            CodeGen.CODE.add(cend);
-            ret.unkeep();
-        }
-        assert !linked(fun);
-    }
-
-
-    // Unlink all linked functions
-    public void unlink_all() {
-        for( int i=0; i<_outputs._len; i++ )
-            if( out(i) instanceof FunNode fun ) {
-                int path = fun._inputs.find(this);
-                unlink(fun,path);
-                i--;
-            }
-    }
-
-    @Override
-    public Parser.ParseException err() {
-        if( fptr()._type == Type.BOTTOM )
-            return null;        // Wrong, but failing earlier
-        if( !(fptr()._type instanceof TypeFunPtr tfp) )
-            return Parser.error("Expected a function, but found " + fptr()._type, _loc);
-        if( !tfp.notNull() )
-            return Parser.error( "Might be null calling "+tfp, _loc);
-        if( nargs() != tfp.nargs() )
-            return Parser.error( "Expecting "+tfp.nargs()+" arguments, but found "+nargs(), _loc);
-
-        // Check for args
-        for( int i=0; i<tfp.nargs(); i++ )
-            if( !arg(i+2)._type.isa(tfp.arg(i)) || !arg(i+2)._type.accessISA(tfp.arg(i)) ) {
-                // Constructors return private memory and carry hidden self and
-                // selfMem arguments ahead of the source-level arguments.
-                int argno = i - (tfp.ret() instanceof TypeMem ? 2 : 0);
-                return Parser.error( "Argument #" + argno + " isa " + arg(i+2)._type + ", but must be a " + tfp.arg(i), _loc );
-            }
-
-        if( tfp.isHigh() )
-            throw Utils.TODO(); // Infinite unknown TFPs?  Should be fairly precise CG
-
-        return null;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CalleeSaveNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/CalleeSaveNode.java
deleted file mode 100644
index 0afc5827..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CalleeSaveNode.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.type.Type;
-
-public class CalleeSaveNode extends ProjNode implements MachNode {
-    final RegMask _mask;
-    public CalleeSaveNode(FunNode fun, int reg, String label) {
-        super(fun,reg,label);
-        fun._outputs.pop();
-        int i=0;
-        while( fun.out(i) instanceof PhiNode )  i++;
-        fun._outputs.insert(this,i);
-        _mask = new RegMask(reg);
-    }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return _mask; }
-    @Override public void encoding( Encoding enc ) { }
-
-    @Override public Type compute() { return Type.BOTTOM; }
-    @Override public Node idealize() { return null; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ConFldOffNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ConFldOffNode.java
deleted file mode 100644
index 0b8053e2..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ConFldOffNode.java
+++ /dev/null
@@ -1,78 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.type.TypeStruct;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-import java.util.HashMap;
-
-/**
- * A field offset.  This becomes a constant *after* other optimizations which
- * determine field sizes - some fields might be dead, or hold only zeros or
- * small values.
- */
-
-public class ConFldOffNode extends ConstantNode {
-    public TypeStruct _ts;      // Struct holding field
-    public final String _fname; // Field name
-    public ConFldOffNode( TypeStruct ts, String fname ) { super(TypeInteger.BOT); _ts = ts; _fname = fname; }
-
-
-    @Override public String label() {
-        return _fname == " len" ? "sizeof("+_ts._name+")" : "#"+_fname;
-    }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.p(label());
-    }
-
-    @Override public Node idealize() {
-        // Some array offsets are known early
-        if( _ts.isAry() ) {
-            // Length always at offset zero
-            if( _fname==" len" )
-                return CodeGen.CODE.ZERO;
-            // The shift depends on the element
-            if( _fname=="<<" )
-                return Node.con(_ts.aryScale());
-            // The base depends on the layout (alignment for large elements may
-            // involve padding) and MAY depend on the length if I go for
-            // smaller array lengths.
-        }
-        return null;
-    }
-
-    // Convert field offset to an integer
-    public Node asOffset() {
-        int fldx = _fname==" len" ? _ts._fields.length : _ts.find(_fname);
-        if( fldx == -1 ) return null;
-        // " len" selects the terminal size slot, not a Field.
-        if( fldx < _ts._fields.length && _ts._fields[fldx]._extern )
-            return new ExternOffsetNode(_fname).peephole();
-        return ConstantNode.make(TypeInteger.constant(_ts.offset(fldx))).peephole();
-    }
-
-    // Upgrade the internal type
-    @Override boolean _upgradeType( HashMap<String,Type> TYPES) {
-        boolean progress = super._upgradeType(TYPES);
-        TypeStruct ts = (TypeStruct)_ts.upgradeType(TYPES);
-        if( ts == _ts ) return progress;
-        _ts = ts;
-        return true;
-    }
-
-    @Override public boolean eq(Node n) {
-        ConFldOffNode off = (ConFldOffNode)n; // Invariant
-        return _ts._name==off._ts._name && _fname.equals(off._fname) && super.eq(n);
-    }
-    @Override int hash() { return super.hash() * _ts._name.hashCode() * _fname.hashCode(); }
-
-    @Override public Parser.ParseException err() {
-        return _ts._fref ? Parser.error("Unknown struct type '"+_ts._name+"'",null) : null;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ConstantNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ConstantNode.java
deleted file mode 100644
index eabf2639..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ConstantNode.java
+++ /dev/null
@@ -1,86 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeFunPtr;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-/**
- * A Constant node represents a constant value.
- * <p>
- * Constants have no semantic inputs. However, we set Start as an input to
- * Constants to enable a forward graph walk.  This edge carries no semantic
- * meaning, and it is present <em>solely</em> to allow visitation.
- * <p>
- * The Constant's value is the value stored in it.
- */
-
-public class ConstantNode extends TypeNode {
-    public ConstantNode( Type type ) {
-        this(type,false);
-    }
-    protected ConstantNode( Type type, boolean raw ) {
-        super(type,new Node[]{CodeGen.CODE._start});
-        assert raw || !(type instanceof TypeFunPtr tfp && tfp.isConstant()) :
-            "Unique function identities require a Return-linked FunPtrNode";
-        _type = type;
-    }
-    public ConstantNode( ConstantNode con ) { super(con); }
-
-
-    // Semantic constant construction through Lower.  A unique internal
-    // function identity carries a lifetime edge to the function's Return.
-    public static Node make( Type type ) {
-        if( type==Type. CONTROL ) return new CtrlNode();
-        if( type==Type.XCONTROL ) return new XCtrlNode();
-        if( CodeGen.CODE._phase != null &&
-            CodeGen.CODE._phase.ordinal() > CodeGen.Phase.Lower.ordinal() )
-            return raw(type);
-        if( type instanceof TypeFunPtr tfp && tfp.isConstant() ) {
-            FunNode fun = CodeGen.CODE._link(tfp);
-            if( fun != null )
-                return new FunPtrNode(tfp,CodeGen.CODE._start,fun.ret()).init();
-            // TODO: A singleton FIDX can also emerge after merging and
-            // guarding several function pointers.  Preserve that identity
-            // even if its internal Return is no longer available.
-            return raw(type);
-        }
-        return new ConstantNode(type);
-    }
-
-    // Exact construction for deserialization and graph-incomplete machine
-    // selection.  No semantic classification, compute, idealize, or GVN.
-    public static ConstantNode raw( Type type ) { return new ConstantNode(type,true); }
-    public static ConstantNode raw( ConstantNode con ) { return new ConstantNode(con); }
-
-    // Analysis input created from whole cloth, rather than a first-class
-    // runtime value.  In particular, a constructor call descriptor does not
-    // own the constructor function; the class FunPtr does.
-    public static ConstantNode seed( Type type ) { return new ConstantNode(type,true); }
-
-    @Override protected String repeatName() {
-        return _con==null || _con.toString().length()<=32 ? null : uniqueName();
-    }
-
-    @Override public String label() { return "Con"; }
-    @Override public Node copy() { return raw(this); }
-
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        if( _con instanceof TypeFunPtr tfp && tfp._isConstant() && tfp.notNull() ) {
-            FunNode fun = CodeGen.CODE._link(tfp);
-            if( fun!=null && fun._name != null )
-                return p.p("{ ").p(fun._name).p("}");
-        }
-        return p.p(_con==null ? "---" : _con.toString());
-    }
-
-    @Override public boolean isConst() { return true; }
-    @Override public Type compute() { return _con; }
-    @Override public Node idealize() { return null; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ConvertNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ConvertNode.java
deleted file mode 100644
index cdc890a7..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ConvertNode.java
+++ /dev/null
@@ -1,101 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-
-import java.util.HashMap;
-
-// Convert a value to an authoritative destination type.  The destination is
-// known structurally from a declaration; the source family might sharpen later.
-public class ConvertNode extends Node {
-    private Type _dst;
-
-    public ConvertNode(Type dst, Node val) {
-        super(null,val);
-        // Folding this conversion would replace the Return-linked FunPtrNode
-        // with an unhooked ConstantNode.
-        assert !(dst instanceof TypeFunPtr && val instanceof FunPtrNode);
-        _dst = dst;
-    }
-
-    public Type dst() { return _dst; }
-    public Node val() { return in(1); }
-
-    @Override public String label() { return "Convert_"+_dst.str(); }
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.p(label()).open().n(val()).close();
-    }
-
-    // The declaration fixes the result family during pessimistic parsing.
-    // From SCCP onward, preserve dead inputs and stronger facts in that family.
-    @Override public Type compute() {
-        Type src = val()._type;
-        if( CodeGen.CODE._phase.ordinal() >= CodeGen.Phase.Opto.ordinal() ) {
-            if( src.isHigh() ) return Type.TOP;
-            if( (src.isa(_dst) && src.accessISA(_dst)) ) return src;
-        }
-        return _dst;
-    }
-
-    @Override public Node idealize() {
-        Type src = val()._type;
-        if( src==Type.BOTTOM || src==Type.TOP ) return null;
-        if( (src.isa(_dst) && src.accessISA(_dst)) ) return val();
-
-        // Managed arrays are represented by an object pointer, while C wants
-        // the address of the first element.  The representation cast itself is
-        // zero-code; the Add skips the array header.
-        if( _dst==TypeInteger.BOT && src instanceof TypeMemPtr tmp && tmp._obj.isAry() )
-            return new AddNode(new PtrToIntNode(val()).peephole(),Parser.off(tmp._obj,"[]"));
-
-        // Integer (and nil-as-zero) to floating point.
-        if( (src instanceof TypeInteger || src==Type.NIL) && _dst instanceof TypeFloat )
-            return new ToFloatNode(val());
-
-        // Convert to i64 first, then apply the destination's integer width.
-        if( src instanceof TypeFloat && _dst instanceof TypeInteger )
-            return new ConvertNode(_dst,new ToIntegerNode(val()).peephole());
-
-        // Narrow integers produce the declared sign/zero extension.
-        if( src instanceof TypeInteger && _dst instanceof TypeInteger dst ) {
-            if( dst._min==0 )
-                return new AndNode(null,val(),con(dst._max));
-            int shift = Long.numberOfLeadingZeros(dst._max)-1;
-            Node shf = con(shift);
-            if( shf._type==TypeInteger.ZERO ) return val();
-            return new SarNode(null,new ShlNode(null,val(),shf.keep()).peephole(),shf.unkeep());
-        }
-
-        // Narrow f64 to f32.
-        if( src instanceof TypeFloat && _dst instanceof TypeFloat )
-            return new RoundF32Node(val());
-
-        // Wait for more source information, or report an error after Opto.
-        return null;
-    }
-
-    @Override boolean _upgradeType(HashMap<String,Type> TYPES) {
-        Type dst = _dst.upgradeType(TYPES);
-        if( dst==_dst ) return false;
-        unlock();
-        _dst = dst;
-        return true;
-    }
-
-    @Override public Parser.ParseException err() {
-        if( val()._type==Type.BOTTOM ||
-            val()._type instanceof TypeNil src && src.nullable() && _dst instanceof TypeNil dst && dst.notNull() ) {
-            Node out = out(0);
-            if( out instanceof PhiNode phi ) out = phi.out(0);
-            if( out instanceof StoreNode st )
-                return Parser.error( "'" + ((TypeMemPtr)st.ptr()._type)._obj._name + "' is not fully initialized, field '" + st._name + "' is only partially set in the constructor", null );
-        }
-        return Parser.error("Type "+val()._type.str()+" is not of declared type "+_dst.str(),null);
-    }
-
-    @Override public boolean eq(Node n) { return _dst==((ConvertNode)n)._dst; }
-    @Override int hash() { return _dst.hashCode(); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CtrlNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/CtrlNode.java
deleted file mode 100644
index 813e6fcb..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/CtrlNode.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.Type;
-
-public class CtrlNode extends CFGNode {
-    public CtrlNode() { super(CodeGen.CODE._start); }
-
-    @Override public String label() { return "Ctrl"; }
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) { return p.p("Cctrl"); }
-    @Override public boolean isConst() { return true; }
-    @Override  public Type compute() { return Type.CONTROL; }
-    @Override public Node idealize() { return null; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/DivNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/DivNode.java
deleted file mode 100644
index 0db2b7a2..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/DivNode.java
+++ /dev/null
@@ -1,40 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.type.TypeFloat;
-import java.util.BitSet;
-
-public class DivNode extends ArithNode {
-    @Override boolean allowFloat() { return true; }
-    public DivNode(Node lhs, Node rhs) { super(null, lhs, rhs); }
-    public DivNode(Node lhs, Node rhs, byte mode) { super(null, lhs, rhs, mode); }
-
-
-    @Override public String op() { return _mode==1 ? "//" : "/"; }
-
-    @Override long   doOp( long  x,  long  y ) { return y==0 ? 0 : x / y; }
-    @Override double doOp(double x, double y ) { return            x / y; }
-    @Override TypeInteger doOp(TypeInteger x, TypeInteger y) {
-        return TypeInteger.BOT;
-    }
-
-    @Override
-    public Node idealize() {
-        // Div of 1.
-        if( in(2)._type == TypeInteger.TRUE && in(1)._type.isa(compute()) )
-            return in(1);
-
-        // Div of constant
-        if( _mode==2 ) {
-            if( in(2)._type == TypeFloat.constant(1.) && in(1)._type.isa(compute()) )
-                return in(1);
-            if( in(2)._type instanceof TypeFloat f && f.isConstant() )
-                return new MulNode(in(1),ConstantNode.make(TypeFloat.constant(1.0/f.value())).peephole(),_mode);
-        }
-
-        return super.idealize();
-    }
-
-    @Override Node copy(Node lhs, Node rhs) { return new DivNode(lhs,rhs,_mode); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/EscapeNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/EscapeNode.java
deleted file mode 100644
index f7518184..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/EscapeNode.java
+++ /dev/null
@@ -1,109 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.*;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-/**
- *  Merge public and private aliases.
- *  0 - control
- *  1 - private pointer
- *  2 - private alias
- *  3 - public alias
- */
-public class EscapeNode extends TypeNode {
-
-    public EscapeNode(Field fld, Node self, Node priv, Node pub ) {
-        super(fld,null,self,priv,pub);
-    }
-    public EscapeNode(EscapeNode esc ) {
-        super(esc);             // Copy constructor
-        // Except we do not want/need self ptr past Opto.
-        // *NOTE* the weird direct stomp; this is correct because this
-        // constructor does NOT set the backedges, because it is used to
-        // copy-construct an entire graph and ALL edges will get rewritten.
-        _inputs.set(1,null);
-        _con = esc._con;
-    }
-
-    // Pointer to some private (unescaped) memory from a NewNode
-    public Node self() { return in(1); }
-    public Node priv() { return in(2); }
-    public Node pub () { return in(3); }
-    public Field fld() { return (Field)_con; }
-
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        p.p("Esc#").p(fld()._alias).p(" {");
-        if( self()==null ) p.p("---");
-        else p.n(self()).p(",");
-        p.n(priv()).p("}, ");
-        p.n(pub ());
-        return p;
-    }
-
-    @Override
-    public Type compute() {
-        if( priv()._type.isHigh() ) return TypeMem.TOP;
-        if( pub ()._type.isHigh() ) return TypeMem.TOP;
-        TypeMem mpriv = (TypeMem)priv()._type;
-        TypeMem mpub  = (TypeMem)pub ()._type;
-        // Private memory comes from an allocation or other non-aliased source.
-        // Public  memory comes from anywhere, might be bulk memory with a very weak mem type.
-        Field fld = fld();
-        assert mpriv._alias==1 || mpriv._alias==fld._alias;
-        assert mpub ._alias==1 || mpub ._alias==fld._alias;
-        Type tpriv = mpriv._t instanceof TypeStruct ts && ts.findAlias(fld._alias)!=-1
-            ? ts.at(ts.findAlias(fld._alias))._t
-            : mpriv._t;
-        assert !(mpub._t instanceof TypeStruct); // Never expect this, but if it starts to happen, need to optimize
-        Type tpub = mpub._t;
-
-        // t is meet of pub & priv.  Pub memory can be very weak (e.g. alias 1)
-        // and we're no worse than the declared field type
-        Type t = tpriv.meet(tpub).join(fld._t);
-        int[] fidxes  = XInt.meet(mpriv._escFs, mpub._escFs);
-        int[] aliases = XInt.meet(mpriv._escAs, mpub._escAs);
-        return TypeMem.make(fld._alias, t, false, false, fld._final, fidxes, aliases).escapesFrom(t);
-    }
-
-    @Override public Node idealize() {
-        // Sharpen private memory input
-        if( priv() instanceof MemMergeNode mmm ) {
-            setDef(2,mmm.alias(fld()._alias));
-            return this;
-        }
-        // Sharpen public memory input
-        if( pub() instanceof MemMergeNode mmm ) {
-            setDef(3,mmm.alias(fld()._alias));
-            return this;
-        }
-        // New allocation is dead
-        if( self()._type.isHigh() )
-            if( pub()._type.isa(_type) ) return pub();
-            else addDep(pub());
-        return null;
-    }
-
-// Upgrade the internal type
-@Override boolean _upgradeType( HashMap<String,Type> TYPES) {
-    Type t = _con.upgradeType(TYPES);
-    if( t == _con ) return false;
-    unlock();               // Unlock before changing _con
-    _con = t;
-    return true;
-}
-
-    @Override public boolean eq(Node n) {
-        if( fld()._alias!=((EscapeNode)n).fld()._alias )
-            return false;
-        assert _con == ((EscapeNode)n)._con;
-        return true;
-    }
-
-    @Override int hash() { return _con.hashCode(); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ExternNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ExternNode.java
deleted file mode 100644
index 2d1dc29f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ExternNode.java
+++ /dev/null
@@ -1,27 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.util.SB;
-
-import java.util.BitSet;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-/**
-    A constant with external linkage.
- */
-
-public class ExternNode extends ConstantNode {
-    public final String _extern;
-    // An exact external function identity has no local FunNode/Return to own.
-    // Its lifetime and eventual relocation are carried by the extern symbol
-    // and CodeGen's FIDX-to-extern mapping instead.
-    public ExternNode(Type t, String ex) { super(t,true); _extern = ex; }
-
-
-    @Override public String  label() { return "#"+_con+":"+_extern; }
-
-    @Override public boolean eq(Node n) { return this==n; }
-
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ExternOffsetNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ExternOffsetNode.java
deleted file mode 100644
index 23ed5468..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ExternOffsetNode.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-// A field address supplied by the C linker, not a displacement from the base.
-// The class base remains available for ideal type/alias analysis. Instruction
-// selection replaces it with this symbol's address and a zero displacement.
-public class ExternOffsetNode extends ExternNode {
-    public ExternOffsetNode(String name) { super(TypeInteger.BOT,name); }
-
-    @Override public Node copy() { return new ExternOffsetNode(_extern); }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/FRefNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/FRefNode.java
deleted file mode 100644
index 644f1434..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/FRefNode.java
+++ /dev/null
@@ -1,50 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.Var;
-import com.seaofnodes.simple.type.Type;
-
-/**
- *  A Forward Reference.  Its any final constant, including functions.  When
- *  the Def finally appears its plugged into the forward reference, which then
- *  peepholes to the Def.
-
- *  FRefs can be external references, to other Simple defined values in ELF
- *  files, or external FFI/C libs.  If external, a file system lookup needs to
- *  find it in another file, and the name (one time) change to match the found
- *  location.
- *
- *  Example, a ambiguous name "foo" is looked up externally; it might resolve
- *  to "A.B.foo" or "libc.foo" or the like; the name is changed to match.
- */
-public class FRefNode extends ConstantNode {
-    public static final Type FREF_TYPE = Type.BOTTOM;
-    public String _name;
-    public final Parser.Lexer _loc;    // Source location
-
-    public FRefNode( String name, Parser.Lexer loc ) { this(name,loc,FREF_TYPE); }
-    public FRefNode( String name, Parser.Lexer loc, Type type ) {
-        super(type);
-        _name = name;
-        _loc = loc;
-    }
-
-    @Override public String label() { return "FRef"+_name; }
-
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.p("FRef_").p(_name);
-    }
-
-    @Override public Node idealize() {
-        // When FRef finds its definition, idealize to it
-        return nIns()==1 ? null : in(1);
-    }
-
-    public Parser.ParseException err() { return Parser.error("Undefined name '"+_name+"'",_loc); }
-
-    @Override public boolean eq(Node n) { return this==n; }
-    @Override int hash() { return _name.hashCode(); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/FldOffNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/FldOffNode.java
deleted file mode 100644
index 535241a6..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/FldOffNode.java
+++ /dev/null
@@ -1,54 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-import java.util.HashMap;
-
-/**
- * A field offset.  This becomes a constant *after* other optimizations which
- * determine field sizes - some fields might be dead, or hold only zeros or
- * small values.
- */
-
-public class FldOffNode extends TypeNode {
-    public final String _fname; // Field name
-    public final Parser.Lexer _loc;   //
-    public FldOffNode( Node base, String fname, Parser.Lexer loc ) { super(TypeInteger.BOT,base); _fname = fname; _loc=loc; }
-
-
-    @Override public String label() {
-        return _fname == " len" ? "sizeof()" : "#"+_fname;
-    }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.p(label());
-    }
-
-    @Override public Type compute() {
-        return Type.BOTTOM;
-    }
-
-    @Override public Node idealize() {
-        // When base() gets typed, this xforms into a ConFldOffNode
-        if( in(0)._type instanceof TypeMemPtr tmp )
-            return new ConFldOffNode(tmp._obj,_fname);
-        return null;
-    }
-
-    @Override public boolean eq(Node n) {
-        FldOffNode off = (FldOffNode)n; // Invariant
-        return _fname.equals(off._fname) && super.eq(n);
-    }
-    @Override int hash() { return super.hash() * _fname.hashCode(); }
-
-    @Override public Parser.ParseException err() {
-        if( in(0)._type instanceof TypeMemPtr tmp && tmp._obj._fref )
-            return Parser.error("Unknown struct type '"+tmp._obj._name+"'",null);
-        return null;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/FunNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/FunNode.java
deleted file mode 100644
index ad79130e..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/FunNode.java
+++ /dev/null
@@ -1,463 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-import java.util.Arrays;
-import java.util.BitSet;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-import static com.seaofnodes.simple.codegen.CodeGen.CODE;
-
-public class FunNode extends RegionNode {
-
-    // When set true, this Call/CallEnd/Fun/Return is being trivially inlined
-    public boolean _folding;
-    public boolean folding() { return _folding; }
-
-    private TypeFunPtr _sig;    // Initial signature
-    private ReturnNode _ret;    // Return pointer
-
-    public String _name;        // Debug name
-
-    public int _approxUIDs;     // Approximate function size, used as a inlining heuristic
-    public CompUnit _compunit;  // Defined in source file
-    public final boolean _extern; // External function; no code, name only
-
-    private FunNode( Parser.Lexer loc, Node[] nodes, TypeFunPtr sig, String name, CompUnit compunit, boolean ext ) {
-        super(loc,nodes);
-        _name   = name;
-        _sig    = sig;
-        _extern = ext;
-        _compunit = compunit;
-    }
-    public FunNode( Parser.Lexer loc, TypeFunPtr sig, String name, CompUnit compunit, Node... nodes ) { this(loc,nodes,sig,name,compunit,false); }
-    public FunNode( FunNode fun ) {
-        super( fun, fun._loc );
-        _sig = fun.sig();
-        _name = fun._name;
-        _compunit = fun._compunit;
-        _extern = fun._extern;
-    }
-
-
-    @Override public String label() { return _name == null ? "$fun"+_sig.fidx() : _name; }
-
-    // Find the one CFG user from Fun.  It's not always the Return, but always
-    // the Return *is* a CFG user of Fun.
-    @Override public CFGNode uctrl() {
-        for( Node n : _outputs )
-            if( n instanceof CFGNode cfg &&
-                (cfg instanceof RegionNode || cfg.cfg0()==this) )
-                return cfg;
-        return null;
-    }
-
-    public ParmNode parm(int idx) {
-        ParmNode pidx = null;
-        for( Node n : _outputs )
-            if( n instanceof ParmNode parm && parm._idx==idx )
-                { assert pidx==null; pidx=parm; }
-        return pidx;
-    }
-    public ParmNode rpc() { return parm(0); }
-
-    // Cannot create the Return and Fun at the same time; one has to be first.
-    // So setting the return requires a second step.
-    public void setRet(ReturnNode ret) { _ret=ret; }
-    public ReturnNode ret() { assert _ret!=null; return _ret; }
-
-    // Signature can improve over time
-    public TypeFunPtr sig() { return _sig; }
-    public void setSig( TypeFunPtr sig ) {
-        assert sig.isa(_sig) || resolvesForwardSelf(sig,_sig);
-        if( _sig != sig ) {
-            CODE.add(this);
-            // Changing the signature can allow more inlining
-            if( _ret != null )
-                for( Node use : ret().outs() )
-                    if( use instanceof CallEndNode || use instanceof FunPtrNode )
-                        CODE.add(use);
-            unlock();
-            _sig = sig;
-        }
-    }
-
-    // A class initializer starts parsing with an open singleton receiver and
-    // closes that same receiver after discovering its fields.  Function
-    // arguments are contravariant, so ordinary isa does not describe this
-    // parser-time forward-reference resolution even though every other part
-    // of the signature sharpens normally.
-    private static boolean resolvesForwardSelf(TypeFunPtr sig, TypeFunPtr old) {
-        if( !(sig.arg(0) instanceof TypeMemPtr now) ||
-            !(old.arg(0) instanceof TypeMemPtr prior) ||
-            now._obj._name != prior._obj._name ||
-            !prior._obj._open || now._obj._open )
-            return false;
-        return sig.makeFrom(old.arg(0),0).isa(old);
-    }
-
-    @Override boolean _upgradeType( HashMap<String,Type> TYPES) {
-        TypeFunPtr sig = (TypeFunPtr)_sig.upgradeType(TYPES);
-        if( sig == _sig ) return false;
-        unlock();
-        _sig = sig;
-        return true;
-    }
-
-    public void setName( String name ) {
-        if( _name==null )
-            _name = _compunit==null || _compunit._cname==null || _compunit._cname.indexOf('.')==-1
-                ? name
-                : (_compunit._cname+"."+name).intern();
-    }
-
-    @Override
-    public Type compute() {
-        // Only dead if no callers after SCCP
-        if( unknownCallers() )
-            return Type.CONTROL;
-        Type t = Type.XCONTROL;
-        for( int i = 1; i < nIns(); i++) {
-            // Since there are no unknown callers, the Start input is only a
-            // fake hook and will be a Tuple with XControl, so ignore it.  Need
-            // to be called from someplace other than Start.
-            if( !(in(i) instanceof StartNode) )
-                t = t.meet(in(i)._type);
-        }
-        return t;
-    }
-
-    @Override
-    public Node idealize() {
-
-        // Some linked path dies, except unknown caller hooks never kill Start.
-        Node progress = deadPath(unknownCallers());
-        if( progress!=null ) {
-            if( nIns()==2 && in(1) instanceof CallNode call )
-                CODE.add(call.cend()); // If no Start and one call, check for inline
-            return progress;
-        }
-
-        // Upgrade inferred or user-written return type to actual
-        if( _ret!=null && _ret._type instanceof TypeTuple tt &&
-            tt.ret() != _sig.ret() && tt.ret().isa(_sig.ret()) ) {
-            setSig(_sig.makeFrom(tt.ret()));
-            return this;
-        }
-
-        // Attempt to get rid of the unknown caller.
-        // - Must be past pessimistic Iter, which discovers and links calls
-        //   through class-field loads and other initially imprecise values.
-        // - FIDX is not in the escape set
-        // - Not called anywhere else; post Opto called-not-escaped functions need to still be hooked to start
-        // Opaque CLInit obligations need their bodies even without Call edges.
-        if( !isClz() && in(1) instanceof StartCUNode start ) {
-            boolean preOpto = CodeGen.CODE._phase == null ||
-                CodeGen.CODE._phase.ordinal() < CodeGen.Phase.Opto.ordinal();
-            if( !preOpto && !start.escapedFIDX(_sig.fidx()) && nIns()<=2 && _ret!=null ) {
-                _compunit._stop.delDef(_compunit._stop._inputs.find(ret()));
-                return removeDeadPath(1);
-            } else {
-                addDep(start);
-            }
-        }
-
-
-        // If no default/unknown caller, use the normal RegionNode ideal rules
-        // to collapse
-        if( unknownCallers() ) return null;
-
-        // If folding (already inlined) down to a single input, become that input.
-        // Cannot collapse if not-inlining, and might not inline if call site
-        // calls multiple targets.
-        if( _folding && nIns()==2 && !hasPhi() ) {
-            CODE.add( CODE._stop ); // Stop will remove dead path
-            CODE.add( _ret );       // Return will compute to TOP control
-            return in(1); // Collapse if no Phis; 1-input Phis will collapse on their own
-        }
-
-        return null;
-    }
-
-    // Bypass Region idom, always assume depth == 1, one more than Start,
-    // unless folding
-    @Override public int idepth() { return _folding ? super.idepth() : 1; }
-
-    // Bypass Region idom, always assume idom is Start
-    @Override public CFGNode idom(Node dep) {
-        return _folding ? cfg(1) : null;
-    }
-
-    // Always in-progress until we run out of unknown callers
-    public boolean unknownCallers() { return nIns()>=2 && in(1) instanceof StartNode; }
-
-    public boolean isModInit( ) {
-        // The one top-level <clinit> with no internal dots:
-        // "sys.<clinit>" is a module, but "sys.io.<clinit>" is not.
-        return isClz() && _name.indexOf('.')==_name.lastIndexOf('.');
-    }
-    public boolean isClz ( ) { return isClz (_name); }
-    public boolean isInit( ) { return isInit(_name); }
-    public boolean isInstance() { return isInstance(_name); }
-    public static boolean isClz (String name ) { return name!=null && name.endsWith(".<clinit>"); }
-    public static boolean isInit(String name ) { return name!=null && name.endsWith("init>"); }
-    public static boolean isInstance(String name ) { return name!=null && name.endsWith(".<init>"); }
-
-    // Allocation factories and instance initializers carry extra memory boilerplate.
-    public int inlineLimit() {
-        return isInstance() || (_name!=null && _name.endsWith(".<new>")) ? 200 : 100;
-    }
-
-    // Function is public (callable from Start directly).
-    public boolean isPublic( ) {
-        // Never true for anonymous functions
-        if( _name == null ) return false;
-        // Only public for <clinit> and <init>, all others
-        // are found via field loads.  The <init> Start hook also supplies its
-        // conservative pre-Opto construction inputs; StopCU separately keeps
-        // its private-memory return from escaping as a public result.
-        if( !isInit() ) return false;
-        // Private class, has to be found via program text, not linker
-        if( _name.charAt(0)=='_' ) return false;
-
-        // No instances of "...clz1._clz2..." where the class name path
-        // includes a private class.
-        if( _name.indexOf("._") != -1 ) return false;
-
-        // Public class <cl/init>
-        return true;
-    }
-
-    @Override public boolean inProgress() {
-        return unknownCallers() && CodeGen.CODE._phase.ordinal() < CodeGen.Phase.Opto.ordinal();
-    }
-
-    // Build the function body set
-    public BitSet body() {
-        // Iter drains ordinary peeps between inlines; body discovery precedes
-        // this inline's folding, so function boundaries are stable.
-        assert !_folding;
-        // Forward control includes paths that never reach Return.
-        BitSet cfgs = new BitSet();
-        walkCFG(this,cfgs);
-        cfgs.set(ret()._nid);
-
-        // Top down (start to stop) all flavors.  CFG limit to bitmap.
-        // If data use bottoms out in wrong CFG, returns false - but tries all outputs.
-        // If any output hits an in-CFG use (e.g. phi), then keep node.
-        BitSet body = new BitSet();
-        // The function owns its Return even when it has no executable exit.
-        body.set(ret()._nid);
-        BitSet visit = new BitSet();
-        int old;
-        do {
-            old = body.cardinality();
-            visit.clear();
-            walkDown(this, cfgs, body, visit);
-        } while( old != body.cardinality() );
-        return body;
-    }
-
-    private static void walkCFG(CFGNode n, BitSet cfgs) {
-        if( cfgs.get(n._nid) ) return;
-        cfgs.set(n._nid);
-        if( n instanceof ReturnNode ) return;
-        for( Node use : n._outputs ) {
-            if( !(use instanceof CFGNode cfg) || cfg instanceof FunNode ) continue;
-            if( cfg instanceof RegionNode ? cfg._inputs.find(n)>0 : cfg.in(0)==n )
-                walkCFG(cfg,cfgs);
-        }
-    }
-
-    private static boolean walkDown( Node n, BitSet cfgs, BitSet body, BitSet visit ) {
-        if( n==null ) return false;
-        if( visit.get(n._nid) ) return body.get(n._nid);
-        visit.set(n._nid);
-        // Visit self as CFG outside the function
-        if( n instanceof CFGNode && !cfgs.get(n._nid) )
-            return false;
-        // Pretend the NewNode is a CFG, so its projections stay with it in loops
-        if( n instanceof NewNode nnn ) cfgs.set(n._nid);
-        // Visit n.cfg() outside of function
-        if( n.in(0)!=null && !cfgs.get(n.in(0)._nid) )
-            return false;
-        // Phis inside the function must have their body flag set BEFORE
-        // recursion walks around a loop and finds them again.
-        if( n instanceof PhiNode phi && cfgs.get(phi.in(0)._nid) )
-            body.set(phi._nid); // Find data cycles
-        boolean in = n.in(0)!=null || n instanceof CFGNode;
-        for( Node use : n._outputs ) {
-            // Will hit a backedge, so 'n' MUST be in the function, and must be
-            // set before the cyclic walk finds 'n' again.
-            if( use instanceof PhiNode puse && puse.in(0) instanceof LoopNode loop && puse.in(2)==n )
-                body.set(n._nid); // Set before walk
-            in |= walkDown(use,cfgs,body,visit);
-        }
-        if( in ) body.set(n._nid);
-        return in;
-    }
-
-    // Clone function body.  Give function a new FIDX.
-    FunNode copyBody() {
-        // Build the function body BitSet
-        BitSet body = body();
-        assert body.cardinality() < inlineLimit();
-        // Walk the body, cloning
-        IdentityHashMap<Node,Node> map = new IdentityHashMap<>();
-        BitSet visit = CodeGen.CODE.visit();
-        bodyCopy( visit, body, map, this );
-        bodyCopy( visit, body, map, _ret ); // May be disconnected from executable control.
-        visit.clear();
-        bodyEdge( visit, body, map, this );
-        bodyEdge( visit, body, map, _ret );
-        visit.clear();
-        assert map.size()==body.cardinality();
-
-        // New function/return cross-link each other
-        FunNode    fun2 = (FunNode   )map.get(this);
-        ReturnNode ret2 = (ReturnNode)map.get(_ret);
-        fun2._ret = ret2;
-        ret2._fun = fun2;
-        BitSet body2 = new BitSet();
-        for( Node n : map.values() )
-            body2.set(n._nid);
-
-        // Remove non-body callers.  Body-local call edges were cloned along
-        // with their CallEnds and must stay linked so their cloned types remain
-        // monotonic during the post-Opto Iter.
-        for( int i=1; i<fun2.nIns(); i++ )
-            if( !(fun2.in(i) instanceof CallNode call) || !body2.get(call._nid) )
-                fun2.removeDeadPath(i--);
-
-        // Linking adds graph edges and worklist entries; identity-map order
-        // would make inlining depend on the host JVM's object hashes.
-        Node[] olds = map.keySet().toArray(new Node[0]);
-        Arrays.sort(olds, (x,y) -> Integer.compare(x._nid,y._nid));
-        for( Node old : olds )
-            if( old instanceof CallNode oldCall )
-                relinkClonedCall(oldCall,(CallNode)map.get(oldCall),map);
-
-        // Flip to a new FIDX to avoid confusion with the old one.
-        // This is a non-monotonic (sideways) type move, only applicable
-        // because fun2 is new.  The fidx is also a purely local fiction,
-        // since this body will inline and the fidx goes dead.
-        fun2._sig = _sig.makeFrom(CodeGen.CODE._fidxs.nextInline());
-        return fun2;
-    }
-
-    private static void relinkClonedCall( CallNode oldCall, CallNode call, IdentityHashMap<Node,Node> map ) {
-        CallEndNode oldCend = oldCall.cend();
-        if( oldCend==null || oldCend._folding )
-            return;
-        for( int i=1; i<oldCend.nIns(); i++ ) {
-            ReturnNode oldRet = (ReturnNode)oldCend.in(i);
-            FunNode oldFun = oldRet.fun();
-            FunNode fun = (FunNode)map.get(oldFun);
-            if( fun==null ) fun = oldFun;
-            if( !call.linked(fun) )
-                call.link(fun);
-        }
-        CallEndNode cend = call.cend();
-        if( cend.nIns() > 1 )
-            cend._type = cend.compute();
-    }
-
-    // Clone small function
-    private void bodyCopy( BitSet visit, BitSet body, IdentityHashMap<Node,Node> map, Node n ) {
-        if( n==null ) return;
-        if( !body.get(n._nid) ) return; // Not part of the body
-        if( visit.get(n._nid) ) return; // Been there, done that
-        visit.set(n._nid);
-        Node m = n.copy();
-        CodeGen.CODE.add(m);
-        map.put(n,m);
-        m._type = n._type;
-        for( Node x : n._outputs )
-            bodyCopy(visit,body,map,x);
-    }
-    private void bodyEdge( BitSet visit, BitSet body, IdentityHashMap<Node,Node> map, Node n ) {
-        if( n==null ) return;
-        if( !body.get(n._nid) ) return; // Not part of the body
-        if( visit.get(n._nid) ) return; // Been there, done that
-        visit.set(n._nid);
-        Node m = map.get(n);
-        for( Node e : n._inputs ) {
-            Node x = e;
-            if( e != null ) {
-                if( n instanceof CallEndNode cend && e != cend.call() &&
-                    (!(e instanceof ReturnNode ret) || map.get(ret.fun()) == null) )
-                    continue;
-                x = map.get(e);
-                if( x == null ) {
-                    if( n instanceof CallEndNode cend && e != cend.call() )
-                        continue;
-                    x = e;
-                }
-            }
-            m.addDef(x);
-        }
-        for( Node x : n._outputs )
-            bodyEdge(visit,body,map,x);
-    }
-
-
-    // no 2 FunNodes are ever GVN'able
-    @Override public boolean eq( Node n ) {
-        return this==n;
-    }
-
-    @Override public int hash() {
-        return _sig.hashCode();
-    }
-
-    // ------------
-    // MachNode specifics, shared across all CPUs
-
-    // Function may call other functions?  X86 requires 16b aligned SP on
-    // outbound calls, but not leaf.  Set during an unrelated RA scan.
-    public boolean _hasCalls;
-
-    // Maximum incoming argument slot, based on function type
-    public int _maxArgSlot;
-
-    // Frame adjust, including padding, set during early Encoding
-    public int _frameAdjust;
-
-    public String op() { return _frameAdjust==0 ? "entry" : "subi"; }
-    public void postSelect(CodeGen code) {
-        code.link(this);
-        // Max slot seen past space reserved for incoming arguments
-        _maxArgSlot = code._mach.maxArgSlot(sig());
-    }
-    public RegMask regmap(int i) { return null; }
-    public RegMask outregmap() { return null; }
-    public void encoding( Encoding enc ) { throw Utils.TODO();  }
-    public void asm(CodeGen code, SB sb) {
-        if( _frameAdjust!=0 )
-            sb.p("rsp -= #").p(_frameAdjust);
-    }
-
-    public void computeFrameAdjust(CodeGen code, int maxReg) {
-        // Max slot seen, or 0.
-        int maxSlot = Math.max(maxReg - code._mach.regs().length,_maxArgSlot);
-        // Frame adjust before rounding, can be negative for no spills
-        int size = maxSlot - _maxArgSlot;
-        _frameAdjust = size*8;
-    }
-
-    // Given a high register number and during encoding compute the stack
-    // pointer offset.  Pre-RA we lack the fun._frameAdjust.  We also need a
-    // FunNode.
-    public int computeStackOffset(CodeGen code, int reg) {
-        String[] regs = code._mach.regs();
-        int stackSlot = reg - regs.length;
-        int slotRotate = stackSlot < _maxArgSlot
-            ? stackSlot + (_frameAdjust>>3)
-            : stackSlot - _maxArgSlot;
-        return slotRotate*8;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/FunPtrNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/FunPtrNode.java
deleted file mode 100644
index 3d6031b8..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/FunPtrNode.java
+++ /dev/null
@@ -1,62 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-// Constant function pointer whose type follows the callee signature.
-public class FunPtrNode extends TypeNode {
-    public FunPtrNode(TypeFunPtr tfp, StartNode start, ReturnNode ret) {
-        super(tfp,start,ret);
-    }
-    public FunPtrNode(FunPtrNode fptr) { super(fptr); }
-
-
-    public ReturnNode ret() { return (ReturnNode)in(1); }
-    public FunNode fun() { return ret().fun(); }
-
-    @Override public String label() { return "#"+_con; }
-    @Override public Node copy() {
-        FunPtrNode fptr = new FunPtrNode((TypeFunPtr)_con,null,null);
-        fptr._type = _type;
-        return fptr;
-    }
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        FunNode fun = CodeGen.CODE._link(((TypeFunPtr)_con).fidx());
-        return fun!=null && fun._name!=null
-            ? p.p("{ ").p(fun._name).p("}")
-            : p.p(_con);
-    }
-
-    @Override public boolean isConst() { return true; }
-    @Override public Type compute() {
-        ReturnNode ret = ret();
-        if( ret == null ) return _con;
-        if( !(ret._type instanceof TypeTuple tt) ) return ret._type.oob();
-        TypeFunPtr tfp = ret.fun().sig();
-        // Both the sig and the return value must be true, so JOIN both
-        Type tret = tfp._ret.join(tt.ret());
-        return tfp.makeFrom(tret);
-    }
-    @Override public Node idealize() {
-        ReturnNode ret = ret();
-        if( ret==null ) return null;
-        // Function died (never executed), but fcn ptr is alive.
-        // Can be checked for null, or for unequals another FunPtr.
-        FunNode fun = addDep(ret.fun());
-        TypeFunPtr sig = fun.sig();
-        if( sig != _con )
-            { liftType(sig);  return this; }
-        // TODO: If the function body dies but this value remains live only as
-        // a null/equality sentinel, preserve the identity without the Return.
-        if( fun.isDead() )
-            { setDef(1,null); liftType(sig.makeFrom(Type.TOP)); return this; }
-        return null;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/GuardMach.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/GuardMach.java
deleted file mode 100644
index 202b1ab8..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/GuardMach.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.util.SB;
-
-public class GuardMach extends GuardNode implements MachNode {
-    public GuardMach(GuardNode guard) { super(guard); }
-    @Override public String op() { return label(); }
-    @Override public RegMask regmap(int i) { assert i==1; return RegMask.FULL; }
-    @Override public RegMask outregmap() { return RegMask.FULL; }
-    @Override public int twoAddress() { return in(1)._type==Type.BOTTOM ? 0 : 1; }
-    @Override public void encoding(Encoding enc) { }
-    @Override public void asm(CodeGen code, SB sb) { sb.p(code.reg(in(1))); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/GuardNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/GuardNode.java
deleted file mode 100644
index e985da72..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/GuardNode.java
+++ /dev/null
@@ -1,62 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeScalar;
-import com.seaofnodes.simple.util.Utils;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-// A branch-proven refinement to zero/null or non-zero/non-null.  The value
-// family is deliberately taken from the input when it becomes known.
-public class GuardNode extends Node {
-    public final boolean _nonZero;
-
-    public GuardNode(boolean nonZero, Node ctrl, Node val) {
-        super(ctrl,val);
-        _nonZero = nonZero;
-    }
-
-    public GuardNode(GuardNode guard) {
-        super(guard);
-        _nonZero = guard._nonZero;
-    }
-
-
-    @Override public String label() { return _nonZero ? "(!=0)" : "(==0)"; }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.p(label()).n(in(1));
-    }
-
-    @Override public Type compute() {
-        // Guard is a pinned, path-local fact.  If its control path is not
-        // executable, the fact is not executable either, regardless of how the
-        // value input sharpens later.
-        Type c = in(0)._type;
-        if( c != Type.CONTROL && c != Type.BOTTOM )
-            return Type.TOP;
-        Type t = in(1)._type;
-        if( t==Type.BOTTOM || t==Type.TOP ) return t;
-        // The scalar envelope does not identify a value family.  Preserve it
-        // until SCCP learns whether this is an int, float, pointer, or fptr;
-        // choosing generic ptr here can be weaker than a later concrete type.
-        if( t==TypeScalar.BOT || t==TypeScalar.TOP ) return t;
-        Type t2 = _nonZero ? t.nonZero() : t.makeZero();
-        return t2==null ? (_type==null ? Type.TOP : _type) : t2; // No sane answer for e.g. not-zero of a zero
-    }
-
-    @Override public Node idealize() {
-        if( in(0)._type != Type.CONTROL && in(0)._type != Type.BOTTOM )
-            return null;
-        if( in(1)._type==Type.BOTTOM || in(1)._type==Type.TOP ) return null;
-        if( _type.isHighOrConst() && in(1)._type.isa(_type) )
-            return in(1);
-        return null;
-    }
-
-    @Override public boolean eq(Node n) { return _nonZero==((GuardNode)n)._nonZero; }
-    @Override int hash() { return _nonZero ? 1 : 0; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/IfNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/IfNode.java
deleted file mode 100644
index 471a28fe..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/IfNode.java
+++ /dev/null
@@ -1,100 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-
-public class IfNode extends CFGNode implements MultiNode {
-
-    public IfNode(Node ctrl, Node pred) {
-        super(ctrl, pred);
-        CodeGen.CODE.add(this); // Because idoms are complex, just add it
-    }
-    public IfNode(IfNode iff) { super(iff); }
-
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        p.p("if( ");
-        if( in(1)==null ) p.p("never");
-        else p.n(in(1));
-        return p.p(" )");
-    }
-
-    public Node ctrl() { return in(0); }
-    public Node pred() { return in(1); }
-
-    // No one unique control follows
-    @Override public CFGNode uctrl() { return null; }
-
-    @Override
-    public Type compute() {
-        // If the If node is not reachable then neither is any following Proj
-        assert !_inputs.isEmpty();
-        if (ctrl()._type != Type.CONTROL && ctrl()._type != Type.BOTTOM )
-            return TypeTuple.IF_NEITHER;
-        Node pred = pred();
-        Type t = pred._type;
-        // High types mean NEITHER side is reachable.
-        // Wait until the type falls to decide which way to go.
-        if( t.isHigh() )
-            return TypeTuple.IF_NEITHER;
-        // If constant is 0 then false branch is reachable
-        // Else true branch is reachable
-        if( t.isConstant() )
-            return (t==Type.NIL || t==TypeInteger.ZERO || (t instanceof TypeFunPtr tfp && tfp._fidxs== XInt.EMPTY) ) ? TypeTuple.IF_FALSE : TypeTuple.IF_TRUE;
-        // If adding a zero makes a difference, the predicate must not have a zero/null
-        if( !t.makeZero().isa(t) )
-            return TypeTuple.IF_TRUE;
-
-        return TypeTuple.IF_BOTH;
-    }
-
-    @Override
-    public Node idealize() {
-        // Hunt up the immediate dominator tree.  If we find an identical if
-        // test on either the true or false branch, that side wins.
-        if( !pred()._type.isHighOrConst() )
-            for( CFGNode dom = idom(), prior=this; dom!=null;  prior = dom, dom = dom.idom() )
-                if( addDep(dom) instanceof IfNode iff &&
-                    prior instanceof CProjNode prj &&
-                    (addDep(iff.pred())==pred() ||
-                     pred() instanceof GuardNode cast && cast._nonZero && iff.pred()==cast.in(1) ) ) {
-                    setDef(1,con( prj._idx==0 ? 1 : 0 ));
-                    return this;
-                }
-        return null;
-    }
-
-    // MachNode variants need to support this and negate the conditional test.
-    // The following CProjs will be inverted by the caller.
-    public void negate() { throw Utils.TODO(); }
-
-    // Negate the sense of a test
-    public static String negate( String bop ) {
-        return switch( bop ) {
-        case "<"  -> ">=";
-        case "<=" -> ">" ;
-        case "==" -> "!=";
-        case "!=" -> "==";
-        case ">"  -> "<=";
-        case ">=" -> "<" ;
-        default -> throw Utils.TODO();
-        };
-    }
-
-    // Swap compare operands
-    public static String swap( String bop ) {
-        return switch( bop ) {
-        case "<"  -> ">" ;
-        case "<=" -> ">=";
-        case "==" -> "==";
-        case "!=" -> "!=";
-        case ">"  -> "<" ;
-        case ">=" -> "<=";
-        default -> throw Utils.TODO();
-        };
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/LoadNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/LoadNode.java
deleted file mode 100644
index e1a495ad..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/LoadNode.java
+++ /dev/null
@@ -1,331 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-import java.util.BitSet;
-
-/**
- * Load represents extracting a value from inside a memory object,
- * in chapter 10 this means Struct fields.
- */
-public class LoadNode extends MemOpNode {
-
-    /**
-     * Load a value from a ptr.field.
-     *
-     * @param name  The field we are loading
-     * @param mem   The memory alias node - this is updated after a Store
-     * @param ptr   The ptr to the struct base from where we load a field
-     * @param off   The offset inside the struct base
-     */
-    public LoadNode(Parser.Lexer loc, String name, int alias, Node ctrl, Node mem, Node ptr, Node off) {
-        super(loc, name, alias, true, Type.BOTTOM, ctrl, mem, ptr, off);
-    }
-
-
-    @Override boolean canDrop(MemOpNode other, Node dep) {
-        return super.canDrop(other,dep) && !clobbered(dep);
-    }
-
-    // Check only immediate memory users. Writers clobber memory; Phis and
-    // aggregates might lead to a clobber, so stop rather than search further.
-    private boolean clobbered(Node dep) {
-        Node mem = mem();
-        dep.addDepForwards(mem);
-        for( Node use : mem._outputs ) {
-            if( use==null ) continue;
-            dep.addDepForwards(use);
-            if( use instanceof StoreNode || use instanceof PhiNode ||
-                use instanceof MemMergeNode ||
-                use instanceof NewNode || use instanceof EscapeNode || use instanceof CallNode ||
-                use instanceof CLInitNode ) return true;
-        }
-        return false;
-    }
-
-    // Debugger label
-    @Override public String  label() { return "ld_"+mlabel(); }
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) { return p.p(".").p(_name); }
-
-    @Override
-    public Type compute() {
-        Type mem0 = mem()._type;
-        Type ptr0 = ptr()._type;
-        // Validate argument types
-        if( ptr0.isHigh() )
-            return TypeScalar.TOP;
-        if( !(mem0 instanceof TypeMem mem) )
-            return mem0.isHigh() ? TypeScalar.TOP : TypeScalar.BOT;
-        if( mem._t == Type.TOP )
-            return TypeScalar.TOP;
-        if( ptr0 == Type.NIL )
-            return Type.BOTTOM; // Load from nil is error
-        if( ptr0 == Type.BOTTOM )
-            return Type.BOTTOM; // Error in is error out
-        if( !(ptr0 instanceof TypeMemPtr tmp) )
-            return scalar(mem._t);
-        if( tmp.nullable() )
-            return Type.BOTTOM; // Load from nil-able is error
-
-        // Load field from object
-        Field pfld = tmp._obj.field(_name);
-        // No field?  Open objects might yet get the field when falling;
-        // closed objects with missing field are an error.
-        if( pfld == null )
-            return tmp.isHigh() || tmp._obj.isHigh() ? TypeScalar.TOP : TypeScalar.BOT;
-
-        Type t = pfld._t;
-        boolean readonly = t instanceof TypeMemPtr view && view._ro;
-        // Load member of constant array
-        if( t instanceof TypeConAry ary )
-            t = ary.elem();     // TODO: if offset is known, can peek the constant
-        if( mem._alias==_alias )
-            t = t.join(mem._t);
-
-        // A deeply read-only base produces a deeply read-only value.  The
-        // generic declared field type must not cast this information away.
-        if( ptr0.isFinal() || readonly )
-            t = t.makeRO();
-        return scalar(t);
-    }
-
-    // Loads produce ordinary scalar values.  Field/memory joins can still
-    // expose the enclosing global lattice bounds through an uninitialized
-    // Type.TOP/BOTTOM field; keep those results inside the scalar envelope.
-    private static Type scalar(Type t) {
-        return t==Type.TOP ? TypeScalar.TOP : t==Type.BOTTOM ? TypeScalar.BOT : t;
-    }
-
-    @Override
-    public Node idealize() {
-        Node mem = mem();
-        Node ptr = ptr();
-
-        // Null checks are handled by types. Array elements retain control for
-        // range checks, but reading an array's length has no index to check.
-        if( in(0)!=null && ptr._type instanceof TypeMemPtr tmp &&
-            (!tmp._obj.isAry() || _name.equals("#")) ) {
-            setDef(0,null);
-            return this;
-        }
-
-        // Forward-ref loads eventually sharpen to a declared type
-        Field fld;
-        if( ptr._type instanceof TypeMemPtr tmp &&
-            (fld=tmp._obj.field(_name)) != null &&
-            _alias != fld._alias) {
-            assert _alias==1 || _alias == fld._alias;
-            assert !tmp._obj._open && !tmp._obj._fref;
-            unlock();           // Alias participates in GVN semantics
-            _alias = fld._alias;
-            return this;
-        }
-        // Must sharpen alias first
-        if( _alias == 1 )
-            return null;
-
-        Node slice = CLInitNode.slice(mem,_alias,this);
-        if( slice!=mem ) { setDef(1,slice); return this; }
-
-        if( mem instanceof MemMergeNode merge ) {
-            setDef(1,merge.alias(_alias));
-            // In support of uplifting control to a prior dominating load, if
-            // we move our memory, recheck other loads to see if they can hoist.
-            for( Node use : in(1).outs() )
-                if( use instanceof LoadNode ld && use != this && ptr == ld.ptr() )
-                    CodeGen.CODE.add(ld);
-
-            return this;
-        }
-
-        // Uplift control to a prior dominating load.
-        for( Node memuse : mem._outputs )
-            // Find a prior load, has same mem,ptr,off but higher ctrl
-            if( memuse != this && memuse instanceof LoadNode ld && ptr==ld.ptr() && off()==ld.off() &&
-                cfg0()!=null && cfg0().domLCA(ld.cfg0(),this) == ld.cfg0() && // Higher control means load is legal earlier
-                addDep(ld)._type.isa(_type) ) // and not rolling backwards
-                return ld;
-
-        Node win = find(mem,ptr,null,null);
-        if( win!=null ) return folded(win);
-        if( ptr instanceof ReadOnlyNode ro ) ptr=ro.in(1);
-
-        // Push a Load up through a Phi, as long as it collapses on at least
-        // one arm.  If at a Loop, the backedge MUST collapse - else we risk
-        // spinning the same transform around the loop indefinitely.
-        //   BEFORE (2 Sts, 1 Ld):          AFTER (1 St, 0 Ld):
-        //   if( pred ) ptr.x = e0;         val = pred ? e0
-        //   else       ptr.x = e1;                    : e1;
-        //   val = ptr.x;                   ptr.x = val;
-        if( mem() instanceof MemPhiNode memphi && memphi.region()._type == Type.CONTROL && memphi.nIns()== 3 &&
-            // Retain control on both copies only if it dominates both paths.
-            // The Region itself, or a later range check, cannot move to its inputs.
-            (in(0)==null || cfg0().domLCA(memphi.region().idom(this),this)==cfg0()) &&
-            // Offset can be hoisted
-            off() instanceof ConstantNode &&
-            // Pointer can be hoisted
-            hoistPtr(ptr,memphi)  ) {
-
-            // Returning to this memory means no change only if the pointer
-            // is also loop invariant. A pointer Phi may select another object.
-            Node stop = memphi.region() instanceof LoopNode &&
-                !(ptr instanceof PhiNode p && p.region()==memphi.region()) ? memphi : null;
-            if( find(memphi.in(2),ptr,stop,new BitSet())!=null ||
-                (!(memphi.region() instanceof LoopNode) && find(memphi.in(1),ptr,null,new BitSet())!=null) ) {
-                // Integer loop Phis widen to i64. Keep the load's declared
-                // width at the result, as for ordinary typed loop variables.
-                if( _type instanceof TypeInteger && !declaredType().isa(_type) ) return null;
-                PhiNode phi = new PhiNode(_name,memphi.region()).keep();
-                phi.setType(_type instanceof TypeInteger ? TypeInteger.BOT : _type);
-                for( int i=1; i<memphi.nIns(); i++ ) {
-                    Node p = ptr instanceof PhiNode pp && pp.region()==memphi.region() ? pp.in(i) : ptr;
-                    phi.addDef(load(memphi.in(i),p,stop,phi));
-                }
-                CodeGen.CODE.add(phi.unkeep());
-                return _type instanceof TypeInteger ? new ConvertNode(declaredType(),phi) : phi;
-            }
-        }
-
-        return null;
-    }
-
-    // Load a flavored zero from a New
-    private Node zero(NewNode nnn) {
-        Type zero = declaredType().makeZero();
-        assert zero.isa(_type); // Catch an uninitialized non-null field
-        return castRO(new ConstantNode(zero).peephole());
-    }
-
-    // Search only; no new nodes or rewiring. Return a Store/New that folds,
-    // the unchanged loop memory, or a merge whose every arm folds. Null fails.
-    // Register dependencies so a later pointer/offset rewrite retries the query.
-    private Node find(Node mem, Node ptr, Node stop, BitSet visit) {
-        if( ptr instanceof ReadOnlyNode ro ) ptr=ro.in(1);
-        Field fld;
-        boolean external = ptr._type instanceof TypeMemPtr tmp &&
-            (fld=tmp._obj.field(_name))!=null && fld._extern;
-        while( mem!=null ) {
-            addDep(mem);
-            if( mem==stop ) return mem;
-            switch( mem ) {
-            case MemMergeNode merge: mem=merge.alias(_alias); break;
-            case StoreNode st:
-                // Alias 1 is still unresolved, not a proven different field.
-                if( st._alias==1 ) return null;
-                addDep(st.ptr());
-                if( _alias==st._alias && (ptr==st.ptr() || ptr==st.nnptr()) && off()==st.off() ) {
-                    // A full-width load cannot narrow the forwarded value.
-                    if( declaredType() instanceof TypeInteger ti && ti.log_size()==3 &&
-                        !addDep(st.val())._type.isa(_type) ) return null;
-                    return st;
-                }
-                if( (external || _alias==st._alias) && (external || !neverAlias(ptr,st.ptr())) &&
-                    !addDep(off())._type.join(addDep(st.off())._type).isHigh() ) return null;
-                mem=st.mem();
-                break;
-            case ProjNode proj:
-                // New's memory is private; public memory is joined at Escape.
-                if( external || !(proj.in(0) instanceof NewNode nnn) ) return null;
-                if( declaredType()==Type.BOTTOM ) return null;
-                return nnn;
-            case EscapeNode esc:
-                if( external ) return null;
-                addDep(esc.self());
-                if( esc.self()==ptr ) { mem=esc.priv(); break; }
-                if( neverAlias(ptr,esc.self()) ) { mem=esc.pub(); break; }
-                return null;
-            case MemPhiNode phi:
-                addDep(phi.region());
-                // Only the original loop closes a successful cycle. Another
-                // loop or an unfinished merge needs a separate proof.
-                if( visit==null || !(phi.region() instanceof RegionNode r) || r instanceof LoopNode ||
-                    r.inProgress() || phi.inProgress() || r._type!=Type.CONTROL ) return null;
-                if( visit.get(phi._nid) ) return phi; // Already proved every arm.
-                for( int i=1; i<phi.nIns(); i++ )
-                    if( find(phi.in(i),ptr,stop,visit)==null ) return null;
-                visit.set(phi._nid);
-                return phi;
-            default: return null;
-            }
-        }
-        return null;
-    }
-
-    private Node folded(Node win) {
-        return win instanceof StoreNode st ? extend(castRO(st.val())) : zero((NewNode)win);
-    }
-
-    // Materialize only after the profitability search succeeds. The value Phi
-    // stands for a load which comes back around the loop with unchanged memory.
-    private Node load(Node mem, Node ptr, Node stop, PhiNode value) {
-        Node win=find(mem,ptr,stop,new BitSet());
-        if( win!=null ) {
-            if( win==stop ) return value;
-            if( win instanceof MemPhiNode mp ) {
-                PhiNode phi=new PhiNode(_name,mp.region()).keep();
-                for( int i=1; i<mp.nIns(); i++ ) phi.addDef(load(mp.in(i),ptr,stop,value));
-                return CodeGen.CODE.add(phi.unkeep().peephole());
-            }
-            Node fold=folded(win);
-            if( fold!=null ) return fold.peephole();
-        }
-        LoadNode ld=new LoadNode(_loc,_name,_alias,in(0),mem,ptr,off());
-        return ld.peephole();
-    }
-
-    private static boolean neverAlias( Node ptr1, Node ptr2 ) {
-        return ptr1.in(0) != ptr2.in(0) &&
-            // Unrelated allocations
-            ptr1 instanceof ProjNode && ptr1.in(0) instanceof NewNode &&
-            ptr2 instanceof ProjNode && ptr2.in(0) instanceof NewNode;
-    }
-
-    private static boolean hoistPtr(Node ptr, PhiNode memphi ) {
-        // Can I hoist ptr above the Region?
-        if( !(memphi.region() instanceof RegionNode r) )
-            return false;       // Dead or dying Region/Phi
-        // If ptr from same Region, then yes, just use hoisted split pointers
-        if( ptr instanceof PhiNode pphi && pphi.region() == r )
-            return true;
-
-        // No, so can we lift this ptr?
-        CFGNode cptr = ptr.cfg0();
-        if( cptr != null )
-            // Pointer is controlled high
-            // TODO: Really needs to be the LCA of all inputs is high
-            return cptr.idepth() <= r.idepth();
-
-        // Dunno without a longer walk
-        return false;
-    }
-
-    // Read-Only is a deep property, and cannot be cast-away
-    private Node castRO(Node rez) {
-        if( (ptr()._type.isFinal() || declaredType().isFinal()) && !rez._type.isFinal() )
-            return new ReadOnlyNode(rez).peephole();
-        return rez;
-    }
-
-    // When a load bypasses a store, the store might truncate bits - and the
-    // load will need to zero/sign-extend.
-    private Node extend(Node val) {
-        if( !(declaredType() instanceof TypeInteger ti) ) return val;
-        if( ti._min==0 )        // Unsigned
-            return new AndNode(null,val,con(ti._max));
-        // Signed extension
-        int shift = Long.numberOfLeadingZeros(ti._max)-1;
-        Node shf = con(shift);
-        if( shift==0 ) {
-            if( !val._type.isa(_type) )
-                { addDep(val); return null; }
-            return val;
-        }
-        Node shl = new ShlNode(null,val,shf.keep()).peephole();
-        return new SarNode(null,shl,shf.unkeep());
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/LoopNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/LoopNode.java
deleted file mode 100644
index 005a6624..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/LoopNode.java
+++ /dev/null
@@ -1,106 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeMem;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-public class LoopNode extends RegionNode {
-    public LoopNode( Parser.Lexer loc, Node xctrl, Node entry ) { super(loc,xctrl,entry,null); }
-    public LoopNode( LoopNode loop ) { super(loop); }
-
-
-    public CFGNode entry() { return cfg(1); }
-    public CFGNode back () { return cfg(2); }
-
-    @Override
-    public Type compute() {
-        if( inProgress() ) return Type.CONTROL;
-        return entry()._type;
-    }
-
-    // Bypass Region idom, same as the default idom() using use in(1) instead of in(0)
-    @Override public int idepth() { return validIDepth() ? _idepth : cacheIDepth(entry().idepth()+1); }
-    // Bypass Region idom, same as the default idom() using use in(1) instead of in(0)
-    @Override public CFGNode idom(Node dep) { return entry(); }
-
-    // If this is an unreachable loop, it may not have an exit.  If it does not
-    // (i.e., infinite loop), force an exit to make it reachable.
-    public FunNode forceExit( FunNode fun, StopNode stop ) {
-        // Walk the backedge, then immediate dominator tree util we hit this
-        // Loop again.  If we ever hit a CProj from an If (as opposed to
-        // directly on the If) we found our exit.
-        CFGNode x = back();
-        while( x != this ) {
-            if( x instanceof CProjNode exit && exit.in(0) instanceof IfNode iff ) {
-                CFGNode other = iff.cproj(1-exit._idx);
-                if( other!=null && other._ltree != _ltree && nested(_ltree,other._ltree) )
-                    return fun; // Found an exit, not an infinite loop
-            }
-            x = x.idom();
-        }
-        // Found a no-exit loop.  Insert an exit
-        NeverNode iff = (NeverNode)new NeverNode(1.2f,back()).peephole(); // Ideal never-branch
-        CProjNode t = new CProjNode(iff,0,"True" ).init();
-        CProjNode f = new CProjNode(iff,1,"False").init();
-        setDef(2,t);            // True continues loop, False (never) exits loop
-        ReturnNode ret = fun.ret();
-        iff._ltree = t._ltree = _ltree;
-        ret._ltree = f._ltree = fun._ltree;
-
-        // Now fold control into the exit.  Might have 1 valid exit, or an
-        // XCtrl or a bunch of prior NeverNode exits.
-        Node top = ConstantNode.make(Type.TOP).peephole();
-        Node memout = new MemMergeNode();
-        memout.addDef(f); // placeholder for control
-        memout.addDef(top);
-        for( Node u : _outputs )
-            if( u instanceof PhiNode phi && phi._type.isa(TypeMem.BOT) )
-                memout.addDef(phi);
-        memout.init();
-
-        Node ctrl = ret.ctrl(), mem = ret.mem(), expr = ret.expr();
-        if( ctrl!=null && ctrl._type != Type.XCONTROL ) {
-            // Perfect aligned exit?
-            if( !(ctrl instanceof RegionNode r &&
-                  mem  instanceof PhiNode pmem && pmem.region()==r &&
-                  expr instanceof PhiNode prez && prez.region()==r ) ) {
-                // Nope, insert an aligned exit layer
-                RegionNode r = new RegionNode(_loc,null,ctrl).init();
-                ctrl = r;  r._ltree = fun._ltree;
-                mem  = new BulkMemPhiNode(r,mem).init();
-                expr = new PhiNode(r,expr).init();
-            }
-            // Append new Never exit
-            ctrl.keep().addDef(f  );
-            mem .keep().addDef(memout);
-            expr.keep().addDef(top);
-        } else {
-            ctrl = f     .keep();
-            mem  = memout.keep();
-            expr = top   .keep();
-        }
-        ret.setDef(0,ctrl.unkeep());
-        ret.setDef(1,mem .unkeep());
-        ret.setDef(2,expr.unkeep());
-        // Force sane types to exit; might locally break monotonicity
-        ret.init();
-        ret.out(0).init();
-        stop.init();
-        CodeGen.CODE.add(CodeGen.CODE._start);
-        CodeGen.CODE.add(mem);
-
-        return fun;
-    }
-
-    private static boolean nested(LoopTree inner, LoopTree outer) {
-        for( ; inner!=null; inner = inner._par )
-            if( inner == outer )
-                return true;
-        return false;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MachConcreteNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/MachConcreteNode.java
deleted file mode 100644
index b25fcaaf..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MachConcreteNode.java
+++ /dev/null
@@ -1,26 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.type.Type;
-import java.io.ByteArrayOutputStream;
-
-// Generic machine-specific class, has a few Node implementations that have to
-// exist (abstract) but are not useful past the optimizer.
-public abstract class MachConcreteNode extends Node implements MachNode {
-
-    public MachConcreteNode(Node node) { super(node); }
-    public MachConcreteNode(Node[]nodes) { super(nodes); }
-
-    @Override public String label() { return op(); }
-    @Override public Type compute () { throw new AssertionError("Do not call compute on "+getClass().getSimpleName()); }
-    @Override public Node idealize() { throw new AssertionError("Do not call idealize on "+getClass().getSimpleName()); }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        p.open().p(op()).p(",");
-        for( int i=1; i<nIns(); i++ )
-            (in(i)==null ? p.p(" ---") :  p.n(in(i))).p(",");
-        return p.unchar(',').close();
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MachNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/MachNode.java
deleted file mode 100644
index 025b5dc4..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MachNode.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.*;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public interface MachNode {
-
-    // Easy access to the abstract Machine
-    default Machine machine() { return CodeGen.CODE._mach; }
-
-    // Run a post-instruction-selection action
-    default void postSelect( CodeGen code ) { }
-
-    // Register mask allowed on input i.  0 for no register.
-    RegMask regmap( int i );
-    // Register mask allowed as a result.  0 for no register.
-    RegMask outregmap();
-    // Multi-reg-defining machine op; idx comes from Proj.
-    // Sometimes these Projs have no uses, and just exist to kill a register.
-    default RegMask outregmap(int idx) { throw Utils.TODO(); }
-
-    // Set of killed registers
-    default RegMask killmap() { return null; }
-
-    // If this op updates the same register as input 'idx', e.g. many X86 "R1 +=
-    // R2" style ops.  This forces the output live range to equal the input live
-    // range, so they both get the same register.
-
-    // This can hold true for projections, if the instruction updates many
-    // registers that it also takes in.  Note that ops also use the same
-    // registers for both inputs and outputs but these are pinned and without any
-    // choices (e.g. always RCX for both an input and output) and are better
-    // served with just declaring as a fixed register.
-
-    // Returns either 0 for not-two-adr or the updated input; for projections
-    // this is their Multi's updated input.
-    default int twoAddress( ) { return 0; }
-    // Ok to switch arguments
-    default boolean commutes() { return false; }
-
-    // Instructions cheaper to recreate than to spill, such as loading small constants
-    default boolean isClone() { return false; }
-
-    // Make a clone of a cheap instruction
-    default Node copy() { return null; }
-
-    // Encoding is appended, relocations gathered.
-    void encoding( Encoding enc );
-
-    // Human-readable form appended to the SB.  Things like the encoding,
-    // indentation, leading address or block labels not printed here.
-    // Just something like "R17=[R18+12] // Load array base".
-    // General form: "dst=src+src".
-    default void asm(CodeGen code, SB sb) { throw Utils.TODO(); }
-
-    // Human-readable opcode; e.g. "ld4" or "call".
-    default String op() { throw Utils.TODO(); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MemMergeNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/MemMergeNode.java
deleted file mode 100644
index cbf19c55..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MemMergeNode.java
+++ /dev/null
@@ -1,154 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.*;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-
-import java.util.*;
-
-/**
- *  Memory Merge - a merge of many aliases into a "fat memory".  All aliases
- *  are here, but most will be lazy - take the default fat memory.
- */
-public class MemMergeNode extends Node {
-
-    public MemMergeNode( Node ...nodes) { super(nodes); _type = TypeMem.BOT; }
-    public MemMergeNode(MemMergeNode mem) { super(mem); }
-
-
-    @Override public String label() { return "ALLMEM"; }
-    @Override public boolean isMem() { return true; }
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        p.p("MEM[ ");
-        for( int j=2; j<nIns(); j++ ) {
-            p.p(j);
-            p.p(":");
-            Node n = in(j);
-            while( n instanceof ScopeNode loop ) {
-                p.p("Lazy_");
-                n = loop.mem();
-            }
-            if( n==null ) p.p("___ ");
-            else p.n(n).p(" ");
-        }
-        return p.unchar(' ').p("]");
-    }
-
-
-    @Override public Type compute() {
-        Type tmem = in(1)._type;
-        if( !(tmem instanceof TypeMem defmem) )
-            // A MemMerge is structurally memory even while its default input
-            // is a weak, not-yet-specialized Phi.
-            return tmem.isHigh() ? TypeMem.TOP : TypeMem.BOT;
-        // Is this a single private instance memory?
-        if( defmem._one ) {
-            if( !(defmem._t instanceof TypeStruct ts) )
-                return defmem;
-            // Perfect singleton memory, so all updates are parallel and
-            // independent and stack.
-            for( int i=2; i<nIns(); i++ ) {
-                Node in = in(i);
-                if( in !=null && in._type.isHigh() )
-                    return TypeMem.TOP;
-                if( in instanceof StoreNode st ) {
-                    Type val = ((TypeMem)st._type)._t;
-                    Field old = ts.field(st._name);
-                    // Lazy add an expected field for open structs.
-                    if( old==null )  { assert ts._open;
-                        old = Field.make(st._name,Type.BOTTOM,st._alias,st._init);
-                        ts = ts.add(old);
-                    }
-                    Field fld = old.makeFrom(val);
-                    // TODO: val leaks into perfect singleton memory, along with its fidxs and aliases
-                    ts = ts.replace(fld);
-                }
-            }
-            return TypeMem.makePrivate(ts);
-
-        }
-
-        // Normal public memory; meet across escaped inputs
-        TypeMem mem = defmem;
-        for( int i=2; i<nIns(); i++ ) {
-            // Has this alias escaped?
-            if( XInt.bit(mem._escAs,i) &&
-                in(i) != null && !in(i)._type.isHigh() ) {
-                mem = (TypeMem)mem.meet(in(i)._type);
-            }
-        }
-        return mem;
-    }
-
-    @Override public Node idealize() {
-        assert nIns() != 0 && in(1)!=null; // Always have a default.  if( nIns()==0 ) return null;
-
-        // Fold defaults into the default
-        boolean progress=false, allDefault=true;
-        for( int i=2; i<nIns(); i++ ) {
-            if( in(1) == in(i) ) { setDef(i,null); progress=true; }
-            else                 { allDefault=false; }
-        }
-
-        // If not merging any memory (all memory is just the default)
-        if( allDefault )
-            return in(1);       // Become default memory
-
-        // Collapse stacked merged-mem
-        if( in(1) instanceof MemMergeNode mem ) {
-            // A dead memory cycle can lose its last use when we bypass mem.
-            // Keep the peephole's result alive until the worklist sees it.
-            keep();
-            // Goal is to swap my default mem with mem's default mem
-            for( int i=2; i<mem.nIns(); i++ ) {
-                if( mem.in(i) != null ) {
-                    // deeper default mem has a non-default
-                    if( i>=nIns() || in(i)==null )
-                        setDefX(i,mem.in(i));
-                }
-            }
-            CodeGen.CODE.add(mem.in(1));
-            setDef(1,mem.in(1));
-            return unkeep();
-        }
-
-        return progress ? this : null;
-    }
-
-
-    public Node in( Var v ) { return in(v._idx); }
-
-    public Node alias( int alias ) {
-        assert !(in(1) instanceof BulkMemPhiNode bulk && bulk.isSplit(alias) &&
-                 (alias >= nIns() || in(alias)==null));
-        return alias < nIns() && in(alias)!=null ? in(alias) : in(1);
-    }
-
-    public Node alias( int alias, Node st ) { return setDefX(alias,st); }
-
-    // Now one-time do a useless-phi removal
-    void _useless( ) {
-        for( int i=1; i<nIns(); i++ ) {
-            if( in(i) instanceof PhiNode phi ) {
-                // Do an eager useless-phi removal
-                Node in = phi.peephole();
-                CodeGen.CODE.addAll(phi._outputs);
-                phi.moveDepsToWorklist();
-                if( in != phi ) {
-                    if( !phi.iskeep() ) // Keeping phi around for parser elsewhere
-                        phi.subsume(in);
-                    setDef(i,in); // Set the update back into Scope
-                }
-            }
-        }
-    }
-
-    @Override public boolean eq( Node n ) {
-        return this==n;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MemOpNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/MemOpNode.java
deleted file mode 100644
index fa399e1d..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MemOpNode.java
+++ /dev/null
@@ -1,140 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.*;
-import java.lang.StringBuilder;
-import java.util.*;
-
-/**
- * Convenience common base for Load and Store.
- *
- * 0 - Control
- * 1 - Memory
- * 2 - Base of object, OOP
- * 3 - Offset, integer types
- * 4 - Value, for Stores only
- */
-public abstract class MemOpNode extends TypeNode {
-
-    // The equivalence alias class
-    public int _alias;
-
-    // True if load-like, false if store-like.
-    // Used on CPU-specific combined memory+arithmetic ops.
-    //
-    // Stores produce memory (maybe as part of a tuple with other things),
-    // loads do not.
-    //
-    // Loads might pick up anti-dependencies on prior Stores, and never cause an
-    // anti-dependence themselves.
-    //
-    // Stores must maximally sink to the least dominator use.  Loads can be
-    // opportunistically hoisted.
-    public final boolean _isLoad;
-
-    // Field name.
-    public final String _name;
-    // Source location for late reported errors
-    public final Parser.Lexer _loc;
-
-    public MemOpNode(Parser.Lexer loc, String name, int alias, boolean isLoad, Type decl, Node ctrl, Node mem, Node ptr, Node off) {
-        super(decl, ctrl, mem, ptr, off);
-        _name  = name;
-        _alias = alias;
-        _loc = loc;
-        _isLoad = isLoad;
-    }
-    public MemOpNode(Parser.Lexer loc, String name, int alias, boolean isLoad, Type decl, Node ctrl, Node mem, Node ptr, Node off, Node value) {
-        this(loc, name, alias, isLoad, decl, ctrl, mem, ptr, off);
-        addDef(value);
-    }
-    public MemOpNode( Node ideal, MemOpNode mop ) {
-        super(ideal,mop instanceof LoadNode ld ? ld.declaredType() : mop._con);
-        _name  = mop._name;
-        _alias = mop._alias;
-        _loc   = mop._loc;
-        _isLoad= mop._isLoad;
-    }
-
-
-    static String mlabel(String name) { return "[]"==name ? "ary" : ("#"==name ? "len" : name); }
-    String mlabel() { return mlabel(_name); }
-
-    public Node mem() { return in(1); }
-    public Node ptr() { return in(2); }
-    public Node off() { return in(3); }
-
-    // Current declared field type.  This is deliberately a live lookup:
-    // cyclic/forward types can sharpen by replacing the pointer's struct.
-    public Type declaredType() {
-        if( !(ptr()._type instanceof TypeMemPtr tmp) )
-            return Type.BOTTOM;
-        Field fld = tmp._obj.field(_name);
-        return fld == null || fld._t == null ? Type.BOTTOM : fld._t;
-    }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) { return _printMach(p);  }
-    protected ExprPrinter<Node> _printMach(ExprPrinter<Node> p) { throw Utils.TODO(); }
-
-
-    // Extra conditions for factoring matching memory operations through a Phi.
-    // The caller has already checked the opcode, input shape and control.
-    boolean canDrop(MemOpNode other, Node dep) {
-        dep.addDep(ptr());
-        return _alias>1 && _alias==other._alias && declaredType()==other.declaredType() && err()==null;
-    }
-
-    @Override
-    public boolean eq(Node n) {
-        MemOpNode mem = (MemOpNode)n; // Invariant
-        return _alias==mem._alias && super.eq(mem);
-    }
-
-    @Override
-    int hash() { return _alias ^ super.hash(); }
-
-    @Override
-    public Parser.ParseException err() {
-        Type ptr = ptr()._type;
-        // Already an error, but better error messages come from elsewhere
-        if( ptr == Type.BOTTOM ) return null;
-        if( ptr.isHigh() ) return null; // Assume it will fall to not-null
-        // Better be a not-nil TMP
-        if( !(ptr instanceof TypeMemPtr tmp && tmp.notNull()) )
-            return Parser.error( "Might be null accessing '" + _name + "'",_loc);
-        if( tmp._obj.field(_name)==null &&
-            CodeGen.CODE._phase.ordinal() > CodeGen.Phase.FinalizeIR.ordinal() )
-            return Parser.error("Accessing unknown field '"+_name+"' from '*"+tmp._obj._name+"'",_loc);
-        // Sane field
-        if( off() instanceof ConFldOffNode && CodeGen.CODE._phase.ordinal() > CodeGen.Phase.FinalizeIR.ordinal() )
-            return Parser.error("Accessing unknown field '"+_name+"' from '*"+tmp._obj._name+"'",_loc);
-        return null;
-    }
-
-    // Memory writers which must follow this read. A packaging node is not a
-    // write; follow this alias through aggregates to its writers.
-    public Ary<Node> antiDeps( Ary<Node> antideps ) {
-        antideps.clear();
-        return antiDeps(mem(),antideps);
-    }
-
-    private Ary<Node> antiDeps( Node mem, Ary<Node> antideps )  {
-        for( Node use : mem._outputs ) {
-            if( use instanceof MemMergeNode merge ) {
-                if( merge.alias(_alias)==mem )
-                    antiDeps(merge,antideps);
-            } else if( use instanceof CallNode || use instanceof CLInitNode ||
-                       (use instanceof MemOpNode st && !st._isLoad && st._alias==_alias) ||
-                       (use instanceof EscapeNode esc && esc.fld()._alias==_alias) ||
-                       (use instanceof MemPhiNode phi && phi._alias==_alias) ||
-                       (use instanceof BulkMemPhiNode phi && !phi.isSplit(_alias)) ) {
-                if( !antideps.contains(use) ) antideps.add(use);
-            }
-        }
-        return antideps;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MemPhiNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/MemPhiNode.java
deleted file mode 100644
index 5ae716a7..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MemPhiNode.java
+++ /dev/null
@@ -1,62 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeMem;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-/** A Phi for one precise memory alias. */
-public class MemPhiNode extends PhiNode {
-
-    public final int _alias;
-
-    public MemPhiNode(String label, int alias, Node... inputs) {
-        super(label, inputs);
-        assert alias > 1;
-        _alias = alias;
-    }
-
-    public MemPhiNode(MemPhiNode phi) {
-        super(phi,phi._label);
-        _alias = phi._alias;
-    }
-
-
-    @Override
-    public Type compute() {
-        Type t = super.compute();
-        assert BulkMemPhiNode.checkMem(this,_alias);
-        if( !(t instanceof TypeMem tmem) ) return t;
-        assert tmem._alias==1 || tmem._alias==_alias;
-        // This Phi structurally knows its alias, but not whether the field is
-        // final.  Do not infer slice finality from evolving input types.
-        return TypeMem.make(_alias,tmem._t,tmem._one,tmem._clz,false,tmem._escFs,tmem._escAs);
-    }
-
-    @Override
-    public Node idealize() {
-        // A precise memory Phi can always bypass a MemMerge and select its
-        // matching slice.
-        for( int i=1; i<nIns(); i++ ) {
-            if( in(i) instanceof MemMergeNode mem ) {
-                setDef(i,mem.alias(_alias));
-                return this;
-            }
-            Node slice = CLInitNode.slice(in(i),_alias,this);
-            if( slice!=in(i) ) { setDef(i,slice); return this; }
-        }
-        if( nIns()==3 && region() instanceof LoopNode loop && !loop.inProgress() &&
-            in(2) instanceof StoreNode st && st.mem()==this ) {
-            Node sink = st.sink(this);
-            if( sink!=null ) return sink;
-        }
-        return super.idealize();
-    }
-
-    @Override public boolean eq(Node n) {
-        return _alias==((MemPhiNode)n)._alias && super.eq(n);
-    }
-
-    @Override int hash() { return _alias; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MinusNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/MinusNode.java
deleted file mode 100644
index 4d7e3ddb..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MinusNode.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.seaofnodes.simple.node;
-
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-public class MinusNode extends Node implements ModeNode {
-    // Mode is 0 for unknown, 1 for int, 2 for flt
-    byte _mode;
-
-    public MinusNode(Node in) { super(null, in); }
-    public MinusNode(Node in, byte mode) { super(null, in); _mode = mode; }
-
-
-    @Override public byte mode() { return _mode; }
-    @Override public Node setMode(byte mode) {
-        assert _mode==0 && (mode==1 || mode==2);
-        unlock();               // _mode participates in GVN hash and equality
-        _mode = mode;
-        return this;
-    }
-
-    @Override protected String format() { return "(-%1)"; }
-
-    @Override
-    public Type compute() {
-        Type t = in(1)._type;
-        if( t==null )
-            return Type.TOP;
-        if( t.isHigh() )
-            return _mode==0 ? Type.TOP :
-                _mode==1 ? TypeInteger.TOP :
-                t instanceof TypeFloat ? t : TypeFloat.F64.dual();
-        byte mode = _mode;
-        if( mode==0 ) {
-            if( t instanceof TypeFloat   ) mode=2;
-            if( t instanceof TypeInteger ) mode=1;
-        }
-        if( mode==0 )
-            return CodeGen.CODE._phase.ordinal() < CodeGen.Phase.Opto.ordinal() ? Type.BOTTOM : Type.TOP;
-        if( mode==1 ) {
-            if( t instanceof TypeInteger i0 &&
-                i0._min != Long.MIN_VALUE && i0._max != Long.MIN_VALUE )
-                return TypeInteger.make(-i0._max,-i0._min,i0._widen);
-            return TypeInteger.BOT;
-        }
-        if( t instanceof TypeFloat f )
-            return f.isConstant() ? TypeFloat.constant(-f.value()) : f;
-        return TypeFloat.F64;
-    }
-
-    @Override
-    public Node idealize() {
-        // -(-x) is x
-        if( in(1) instanceof MinusNode minus && addDep(minus.in(1))._type.isa(compute()) )
-            return minus.in(1);
-
-        // Can we decide int vs flt?
-        if( _mode==0 ) {
-            byte mode = (byte)(
-                in(1)._type instanceof TypeInteger ? 1 :
-                in(1)._type instanceof TypeFloat   ? 2 : 0);
-            if( mode!=0 ) return setMode(mode).init();
-        }
-
-        return null;
-    }
-    @Override public Parser.ParseException err() {
-        return ArithNode.nodeErr(this,null,"-",_mode,true);
-    }
-    @Override public boolean eq( Node n ) { return _mode==((MinusNode)n)._mode; }
-    @Override public int hash() { return _mode; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ModeNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ModeNode.java
deleted file mode 100644
index dc635447..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ModeNode.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package com.seaofnodes.simple.node;
-
-/**
- * A node whose numeric input family is selected once: unknown, integer, or
- * floating point.  Implementors remain ordinary Nodes; this interface only
- * centralizes the structural mode contract shared by arithmetic, comparisons,
- * and unary minus.
- */
-public interface ModeNode {
-    byte mode();
-    Node setMode(byte mode);
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MulNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/MulNode.java
deleted file mode 100644
index 49c6432a..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MulNode.java
+++ /dev/null
@@ -1,65 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-import java.util.BitSet;
-
-public class MulNode extends ArithNode {
-    @Override boolean allowFloat() { return true; }
-    public MulNode(Node lhs, Node rhs) { super(null, lhs, rhs); }
-    public MulNode(Node lhs, Node rhs, byte mode) { super(null, lhs, rhs, mode); }
-
-
-    @Override public String op() { return "*"; }
-
-    @Override long   doOp( long  x,  long  y ) { return x * y; }
-    @Override double doOp(double x, double y ) { return x * y; }
-    @Override TypeInteger doOp(TypeInteger x, TypeInteger y) {
-        return TypeInteger.BOT;
-    }
-
-    @Override
-    public Node idealize() {
-        Node lhs = in(1);
-        Node rhs = in(2);
-        Type t1 = lhs._type;
-        Type t2 = rhs._type;
-
-        // Move constants to RHS: con*arg becomes arg*con
-        if ( t1.isConstant() && !t2.isConstant() )
-            return swap12();
-
-        // Multiply by constant
-        if ( t2.isConstant() && t2 instanceof TypeInteger i ) {
-            // Mul of 1.  We do not check for (1*x) because this will already
-            // canonicalize to (x*1)
-            long c = i.value();
-            if( c==1 )  return lhs._type.isa(compute()) ? lhs : super.idealize();
-            if( c==0 )  return CodeGen.CODE.ZERO;
-            // Mul by a power of 2, +/-1.  Bit patterns more complex than this
-            // are unlikely to win on an X86 vs the normal "imul", and so
-            // become machine-specific.
-            if( (c & (c-1)) == 0 )
-                return new ShlNode(null,lhs,con(Long.numberOfTrailingZeros(c)));
-            // 2**n + 1, e.g. 9
-            long d = c-1;
-            if( (d & (d-1)) == 0 )
-                return new AddNode(new ShlNode(null,lhs,con(Long.numberOfTrailingZeros(d))).peephole(),lhs);
-            // 2**n - 1, e.g. 31
-            long e = c+1;
-            if( (e & (e-1)) == 0 )
-                return new SubNode(new ShlNode(null,lhs,con(Long.numberOfTrailingZeros(e))).peephole(),lhs);
-
-        }
-
-        // Do we have ((x * (phi cons)) * con) ?
-        // Do we have ((x * (phi cons)) * (phi cons)) ?
-        // Push constant up through the phi: x * (phi con0*con0 con1*con1...)
-        Node phicon = AddNode.phiCon(this,true);
-        if( phicon!=null ) return phicon;
-
-        return super.idealize();
-    }
-    @Override Node copy(Node lhs, Node rhs) { return new MulNode(lhs,rhs,_mode); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MultiNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/MultiNode.java
deleted file mode 100644
index 152d525a..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/MultiNode.java
+++ /dev/null
@@ -1,29 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.util.Ary;
-
-
-public interface MultiNode {
-
-    abstract Ary<Node> outs();
-
-    // Find a projection by index
-    default ProjNode proj( int idx ) {
-        for( Node out : outs() )
-            if( out instanceof ProjNode prj && prj._idx==idx )
-                return prj;
-        return null;
-    }
-
-    // Find a projection by index
-    default CProjNode cproj( int idx ) {
-        for( Node out : outs() )
-            if( out instanceof CProjNode prj && prj._idx==idx )
-                return prj;
-        return null;
-    }
-
-    // Return not-null if this projection index is a ideal copy.
-    // Called by ProjNode ideal and used to collapse Multis.
-    default Node pcopy(int idx, Node dep) { return null; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/NeverNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/NeverNode.java
deleted file mode 100644
index a7b4cf65..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/NeverNode.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeTuple;
-
-
-// "Never true" for infinite loop exits
-public class NeverNode extends IfNode {
-    public NeverNode(NeverNode ctrl) { super(ctrl); }
-    public NeverNode(float ignore, Node ctrl) { super(ctrl,null); }
-
-
-    @Override public String label() { return "Never"; }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) { return p.p("Never"); }
-
-    @Override public Type compute() { return TypeTuple.IF_BOTH; }
-
-    @Override public Node idealize() { return null; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/NewNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/NewNode.java
deleted file mode 100644
index 5cbe1b61..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/NewNode.java
+++ /dev/null
@@ -1,98 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.SB;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-/**
- * Allocation!  Allocate a chunk of memory, no init.
- * Takes in ctrl and size, and TypeStruct.
- * Produces a ptr and private memory.
-*/
-public class NewNode extends Node implements MultiNode {
-    public TypeStruct _ts;
-    public NewNode( TypeStruct ts, Node ctrl, Node size ) { super(ctrl,size); _ts = ts; }
-
-    public Node ctrl() { return in(0); }
-    public Node size() { return in(1); }
-
-    // --- Serialization
-    public NewNode(NewNode nnn) { super(nnn); _ts = nnn._ts; }
-
-
-    @Override public String label() { return "new_"+(_ts.isAry() ? "ary_"+_ts._fields[1]._t.str() : _ts.str()); }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.p("new ").p(_ts.str());
-    }
-
-    @Override public TypeTuple compute() {
-        if( ctrl()._type.isHigh() )
-            return TypeTuple.DEAD_NEW;
-        TypeStruct ts = _ts.isAry() ? _ts : _ts.makeInit();
-        return TypeTuple.make(TypeMemPtr.make(_ts),
-                              // Arrays get pre-zeroed by constructor.
-                              // Objects start with default-zero memory for
-                              // fields that can be zero-initialized.  This is
-                              // still private memory, so no aliases escape yet.
-                              TypeMem.make(1,ts,true,false,false,null,null));
-    }
-
-    @Override public Node idealize() { return null; }
-
-    @Override boolean _upgradeType( HashMap<String,Type> TYPES) {
-        Type old = _ts; _ts = (TypeStruct)_ts.upgradeType(TYPES);  return old != _ts;
-    }
-
-    // Two NewNodes are never equal; NewNodes always make independent pointers
-    // so they are not functional - they internally bump-ptr allocate always a
-    // new pointer.
-    @Override public boolean eq(Node n) { return this==n; }
-
-    @Override int hash() { return _ts.hashCode(); }
-
-
-    @Override public Parser.ParseException err() {
-        return _ts._fref ? Parser.error("Unknown struct type '"+_ts._name+"'",null) : null;
-    }
-
-
-    // ------------
-    // MachNode specifics, shared across all CPUs
-    public int _arg2Reg, _xslot;
-    private RegMask _arg3Mask;
-    private RegMask _retMask;
-    private RegMask _kills;
-    public void cacheRegs(CodeGen code) {
-        _arg2Reg  = code._mach.callArgMask(TypeFunPtr.CALLOC,2,0,code._cCallingConv).firstReg();
-        _arg3Mask = code._mach.callArgMask(TypeFunPtr.CALLOC,3,0,code._cCallingConv);
-        // Return mask depends on TFP (either GPR or FPR)
-        _retMask = code._mach.retMask(TypeFunPtr.CALLOC);
-        // Kill mask is all caller-saves, and any mirror stack slots for args
-        // in registers.
-        RegMaskRW kills = code._cCallerSave.copy();
-        // Start of stack slots
-        int maxReg = code._mach.regs().length;
-        // Incoming function arg slots, all low numbered in the RA
-        int fslot = cfg0().fun()._maxArgSlot;
-        // Killed slots for this calls outgoing args
-        int xslot = code._mach.maxArgSlot(TypeFunPtr.CALLOC,code._cCallingConv);
-        _xslot = (maxReg+fslot)+xslot;
-        for( int i=0; i<xslot; i++ )
-            kills.set((maxReg+fslot)+i);
-        _kills = kills;
-    }
-    public String op() { return "alloc"; }
-    public RegMask regmap(int i) { return i==1 ? _arg3Mask : null; }
-    public RegMask outregmap() { return null; }
-    public RegMask outregmap(int idx) { return idx==0  ? _retMask : null; }
-    public RegMask killmap() { return _kills; }
-    public void asm(CodeGen code, SB sb) {
-        sb.p("#malloc, ").p(code.reg(size()));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/Node.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/Node.java
deleted file mode 100644
index de39ca80..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/Node.java
+++ /dev/null
@@ -1,696 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.BaseNode;
-
-import com.seaofnodes.simple.IterPeeps;
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.print.IRPrinter;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.*;
-import java.util.*;
-import java.util.function.Function;
-import static com.seaofnodes.simple.codegen.CodeGen.CODE;
-
-/**
- * All Nodes in the Sea of Nodes IR inherit from the Node class.
- * The Node class provides common functionality used by all subtypes.
- * Subtypes of Node specialize by overriding methods.
- */
-public abstract class Node extends BaseNode<Node> implements Cloneable {
-
-    /**
-     * Inputs to the node. These are use-def references to Nodes.
-     * <p>
-     * Generally fixed length, ordered, nulls allowed, no unused trailing space.
-     * Ordering is required because e.g. "a/b" is different from "b/a".
-     * The first input (offset 0) is often a {@link CFGNode} node.
-     */
-    public Ary<Node> _inputs;
-
-    /**
-     * Outputs reference Nodes that are not null and have this Node as an
-     * input.  These nodes are users of this node, thus these are def-use
-     * references to Nodes.
-     * <p>
-     * Outputs directly match inputs, making a directed graph that can be
-     * walked in either direction.  These outputs are typically used for
-     * efficient optimizations but otherwise have no semantics meaning.
-     */
-     public Ary<Node> _outputs;
-
-    /**
-     * Current computed type for this Node.  This value changes as the graph
-     * changes and more knowledge is gained about the program.
-     */
-    public Type _type;
-
-    Node(Node... inputs) {
-        super(CODE.getUID()); // allocate unique dense ID
-        _inputs = new Ary<>(Node.class);
-        Collections.addAll(_inputs,inputs);
-        _outputs = new Ary<>(Node.class);
-        for( Node n : _inputs )
-            if( n != null )
-                n.addUse( this );
-    }
-
-    // Make a Node using the existing arrays of nodes.
-    // Used by any pass rewriting all Node classes but not the edges.
-    Node( Node n ) {
-        super(CODE.getUID()); // allocate unique dense ID
-        assert CodeGen.CODE._phase.ordinal() >= CodeGen.Phase.Select.ordinal();
-        _inputs  = new Ary<>(n==null ? new Node[0] : n._inputs.asAry());
-        _outputs = new Ary<>(Node.class);
-        _type = n==null ? Type.BOTTOM : n._type;
-        _deps = null;
-        _hash = 0;
-    }
-
-    // Easy reading label for debugger, e.g. "Add" or "Region" or "EQ"
-    public String label() { return getClass().getSimpleName().replace("Node",""); }
-
-    public String p(int depth) { return IRPrinter.prettyPrint(this,depth); }
-
-    public boolean isConst() { return false; }
-
-    // ------------------------------------------------------------------------
-    // Graph Node & Edge manipulation
-
-    @Override public String typeName() { return _type==null ? null : _type.toString(); }
-
-    /**
-     * Gets the ith input node
-     * @param i Offset of the input node
-     * @return Input node or null
-     */
-    public Node in(int i) { return _inputs.get(i); }
-    public Node out(int i) { return _outputs.get(i); }
-    public final Ary<Node> outs() { return _outputs; }
-
-    public int nIns() { return _inputs.size(); }
-
-    public int nOuts() { return _outputs.size(); }
-
-    public boolean isUnused() { return nOuts() == 0; }
-
-    public CFGNode cfg0() { return (CFGNode)in(0); }
-
-    /**
-     * Change a <em>def</em> into a Node.  Keeps the edges correct, by removing
-     * the corresponding <em>use->def</em> edge.  This may make the original
-     * <em>def</em> go dead.  This function is co-recursive with {@link #kill}.
-     * <p>
-
-     * This method is the normal path for altering a Node, because it does the
-     * proper default edge maintenance.  It also <em>immediately</em> kills
-     * Nodes that lose their last use; at times care must be taken to avoid
-     * killing Nodes that are being used without having an output Node.  This
-     * definitely happens in the middle of recursive {@link #peephole} calls.
-     *
-     * @param idx which def to set
-     * @param new_def the new definition
-     * @return new_def for flow coding
-     */
-    public <N extends Node> N setDef(int idx, N new_def ) {
-        unlock();
-        Node old_def = in(idx);
-        if( old_def == new_def ) return new_def; // No change
-        // If new def is not null, add the corresponding def->use edge
-        // This needs to happen before removing the old node's def->use edge as
-        // the new_def might get killed if the old node kills it recursively.
-        if( new_def != null )
-            new_def.addUse(this);
-        // Set the new_def over the old (killed) edge
-        _inputs.set(idx,new_def);
-        if( old_def != null ) {        // If the old def exists, remove a def->use edge
-            if( old_def.delUse(this) ) // If we removed the last use, the old def is now dead
-                old_def.kill();        // Kill old def
-            else CODE.add(old_def);    // Else old lost a use, so onto worklist
-        }
-        moveDepsToWorklist();
-        // Return new_def for easy flow-coding
-        return new_def;
-    }
-    public <N extends Node> N setDefX(int idx, N new_def ) {
-        while( nIns() <= idx ) addDef(null);
-        return setDef(idx,new_def);
-    }
-
-    // Remove the numbered input, compressing the inputs in-place.  This
-    // shuffles the order deterministically - which is suitable for Region and
-    // Phi, but not for every Node.  If the def goes dead, it is recursively
-    // killed, which may include 'this' Node.
-    public Node delDef(int idx) {
-        unlock();
-        Node old_def = in(idx);
-        _inputs.del(idx);
-        if( old_def.delUse(this) ) // If we removed the last use, the old def is now dead
-            old_def.kill();     // Kill old def
-        old_def.moveDepsToWorklist();
-        return this;
-    }
-
-    // Insert the numbered input, sliding other inputs to the right
-    public void insertDef(int idx, Node new_def) {
-        _inputs.insert(null,idx);
-        setDef(idx,new_def);
-    }
-
-    /**
-     * Add a new def to an existing Node.  Keep the edges correct by
-     * adding the corresponding <em>def->use</em> edge.
-     *
-     * @param new_def the new definition, appended to the end of existing definitions
-     * @return new_def for flow coding
-     */
-    public Node addDef(Node new_def) {
-        unlock();
-        // Add use->def edge
-        _inputs.add(new_def);
-        // If new def is not null, add the corresponding def->use edge
-        if( new_def != null )
-            new_def.addUse(this);
-        return new_def;
-    }
-
-    // Breaks the edge invariants, used temporarily
-    @SuppressWarnings("unchecked")
-    protected <N extends Node> N addUse(Node n) { _outputs.add(n); return (N)this; }
-
-    // Remove node 'use' from 'def's (i.e. our) output list, by compressing the list in-place.
-    // Return true if the output list is empty afterward.
-    // Error is 'use' does not exist; ok for 'use' to be null.
-    public boolean delUse( Node use ) {
-        _outputs.del(_outputs.find(use));
-        moveDepsToWorklist(); // User-count and anti-dependence queries can now change.
-        return _outputs.isEmpty();
-    }
-
-    // Shortcut for "popping" until n nodes.  A "pop" is basically a
-    // setDef(last,null) followed by lowering the nIns() count.
-    public void popUntil(int n) {
-        unlock();
-        while( nIns() > n ) {
-            Node old_def = _inputs.pop();
-            if( old_def != null &&     // If it exists and
-                old_def.delUse(this) ) // If we removed the last use, the old def is now dead
-                old_def.kill();        // Kill old def
-        }
-    }
-    public Node removeLast() {
-        Node old_def = _inputs.pop();
-        if( old_def != null )
-            old_def.delUse(this);
-        return old_def;
-    }
-
-    /**
-     * Kill a Node with no <em>uses</em>, by setting all of its <em>defs</em>
-     * to null.  This may recursively kill more Nodes, and is basically dead
-     * code elimination.
-     */
-    public void kill( ) {
-        assert isUnused();      // Has no uses, so it is dead
-        unlock();
-        moveDepsToWorklist();
-        _type=null;             // Flag as dead
-        while( nIns()>0 ) { // Set all inputs to null, recursively killing unused Nodes
-            Node old_def = _inputs.removeLast();
-            // Revisit neighbor because removed use
-            if( old_def != null ) {
-                if( CODE.add(old_def).delUse(this) )
-                    old_def.kill(); // If we removed the last use, the old def is now dead
-                old_def.moveDepsToWorklist(); // Use-count changes can enable distant rewrites.
-            }
-        }
-        assert isDead();        // Really dead now
-    }
-
-    // Preserve CFG use-ordering when killing
-    public void killOrdered() {
-        CFGNode cfg = cfg0();
-        cfg._outputs.remove(cfg._outputs.find(this));
-        _inputs.set(0,null);
-        kill();
-    }
-
-    // Mostly used for asserts and printing.
-    public boolean isDead() { return isUnused() && nIns()==0 && _type==null; }
-
-    // Shortcuts to stop DCE mid-parse
-    // Add bogus null use to keep node alive
-    public <N extends Node> N keep() { return addUse(null); }
-    // Remove bogus null.
-    @SuppressWarnings("unchecked")
-    public <N extends Node> N unkeep() {
-        delUse(null);
-        return (N)this;
-    }
-    // Test "keep" status
-    public boolean iskeep() { return _outputs.find(null) != -1; }
-    public void unkill() {
-        if( unkeep().isUnused() )
-            kill();
-    }
-    public void isKill() {
-        if( isUnused() )
-            kill();
-    }
-
-    // Replace self with nnn in the graph, making 'this' go dead
-    public void subsume( Node nnn ) {
-        assert nnn!=this;
-        while( nOuts() > 0 ) {
-            Node n = _outputs.removeLast();
-            n.unlock();
-            int idx = n._inputs.find(this);
-            n._inputs.set(idx,nnn);
-            nnn.addUse(n);
-            CODE.add(n);
-            CODE.addAll(n._outputs);
-        }
-        kill();
-    }
-
-    // insert `this` immediately after `def` in the same basic block.
-    public void insertAfter( Node def ) {
-        CFGNode cfg = def.cfg0();
-        int i = cfg._outputs.find(def)+1;
-        if( cfg instanceof CallEndNode ) {
-            cfg = cfg.uctrl();  i=0;
-        } else if( def.in(0) instanceof MultiNode ) {
-            assert i==0;
-            i = cfg._outputs.find(def.in(0))+1;
-        }
-
-        while( cfg.out(i) instanceof PhiNode || cfg.out(i) instanceof CalleeSaveNode )  i++;
-        cfg._outputs.insert(this,i);
-        _inputs.set(0,cfg);
-    }
-
-    // Insert this in front of use.in(uidx) with this, and insert this
-    // immediately before use in the basic block.
-    public void insertBefore( Node use, int uidx ) {
-        CFGNode cfg = use.cfg0();
-        int i;
-        if( use instanceof PhiNode phi ) {
-            cfg = phi.region().cfg(uidx);
-            if( cfg instanceof CProjNode && cfg.in(0) instanceof NeverNode nvr )
-                cfg = nvr.cfg0();
-            i = cfg.nOuts()-1;
-        } else {
-            i = cfg._outputs.find(use);
-        }
-        cfg._outputs.insert(this,i);
-        _inputs.set(0,cfg);
-        if( _inputs._len > 1 && this instanceof SplitNode )
-            setDefOrdered(1,use.in(uidx));
-        use.setDefOrdered(uidx,this);
-    }
-
-    public void setDefOrdered( int idx, Node def) {
-        // If old is dying, remove from CFG ordered
-        Node old = in(idx);
-        if( old!=null && old.nOuts()==1 ) {
-            CFGNode cfg = old.cfg0();
-            if( cfg!=null ) {
-                cfg._outputs.remove(cfg._outputs.find(old));
-                old._inputs.set(0,null);
-            }
-        }
-        setDef(idx,def);
-    }
-
-    public void removeSplit() {
-        CFGNode cfg = cfg0();
-        cfg._outputs.remove(cfg._outputs.find(this));
-        _inputs.set(0,null);
-        if( _inputs._len > 1 ) subsume(in(1));
-    }
-
-    // ------------------------------------------------------------------------
-    // Graph-based optimizations
-
-    /**
-     * Try to peephole at this node and return a better replacement Node.
-     * Always returns some not-null Node (often this).
-     */
-    public final Node peephole( ) {
-        var obs = CODE._midAssert ? null : CODE._obs;
-        if( obs != null ) obs.before(this);
-        Node n = peepholeOpt();
-        Node rez = n==null ? this : deadCodeElim(n._nid >= _nid ? n.peephole() : n);
-        if( obs != null ) obs.after(this, n==null ? null : rez, false);
-        return rez;             // Cannot return null for no-progress
-    }
-
-    /**
-     * Try to peephole at this node and return a better replacement Node if
-     * possible.  We compute a {@link Type} and then check and replace:
-     * <ul>
-     * <li>if the Type {@link Type#isConstant}, we replace with a {@link ConstantNode}</li>
-     * <li>in a future chapter we will look for a
-     * <a href="https://en.wikipedia.org/wiki/Common_subexpression_elimination">Common Subexpression</a>
-     * to eliminate.</li>
-     * <li>we ask the Node for a better replacement.  The "better replacement"
-     * is things like {@code (1+2)} becomes {@code 3} and {@code (1+(x+2))} becomes
-     * {@code (x+(1+2))}.  By canonicalizing expressions we fold common addressing
-     * math constants, remove algebraic identities and generally simplify the
-     * code. </li>
-     *
-     * Unlike peephole above, this explicitly returns null for no-change, or not-null
-     * for a better replacement (which can be this).
-     * </ul>
-     */
-    public final Node peepholeOpt( ) {
-        CODE.iterCnt();
-        // Compute initial or improved Type
-        Type old = setType(compute());
-
-        // Replace constant computations from non-constants with a constant node.
-        if( !isConst() && !(this instanceof ParmNode parm && parm.inProgress()) &&
-            _type.isHighOrConst() )
-            return ConstantNode.make(_type).peephole();
-
-        // Global Value Numbering
-        if( _hash==0 ) {
-            Node n = CODE._gvn.get(this); // Will set _hash as a side effect
-            if( n==null )
-                CODE._gvn.put(this,this);  // Put in table now
-            else {
-                // Because of random worklist ordering, the two equal nodes
-                // might have different types.  Because of monotonicity, both
-                // types are valid.  To preserve monotonicity, the resulting
-                // shared Node has to have the best of both types.
-                n.setType(n._type.join(_type));
-                _hash = 0; // Clear, since it never went in the table
-                return deadCodeElim(n);// Return previous; does Common Subexpression Elimination
-            }
-        }
-
-        // Ask each node for a better replacement
-        Node n = idealize();
-        if( n != null )         // Something changed
-            return n;           // Report progress
-
-        if( old!=_type ) return this; // Report progress;
-        CODE.iterNop();
-        return null;            // No progress
-    }
-
-    // m is the new Node, self is the old.
-    // Return 'm', which may have zero uses but is alive nonetheless.
-    // If self has zero uses (and is not 'm'), {@link #kill} self.
-    private Node deadCodeElim(Node m) {
-        // If self is going dead and not being returned here (Nodes returned
-        // from peephole commonly have no uses (yet)), then kill self.
-        if( m != this && isUnused() && !isDead() ) {
-            // Killing self - and since self recursively kills self's inputs we
-            // might end up killing 'm', which we are returning as a live Node.
-            // So we add a bogus extra null output edge to stop kill().
-            m.keep();      // Keep m alive
-            kill();        // Kill self because replacing with 'm'
-            m.unkeep();    // Okay to peephole m
-        }
-        return m;
-    }
-
-    /**
-     * This function needs to be
-     * <a href="https://en.wikipedia.org/wiki/Monotonic_function">Monotonic</a>
-     * as it is part of a Monotone Analysis Framework.
-     * <a href="https://www.cse.psu.edu/~gxt29/teaching/cse597s21/slides/08monotoneFramework.pdf">See for example this set of slides</a>.
-     * <p>
-     * For Chapter 2, all our Types are really integer constants, and so all
-     * the needed properties are trivially true, and we can ignore the high
-     * theory.  Much later on, this will become important and allow us to do
-     * many fancy complex optimizations trivially... because theory.
-     * <p>
-     * {@link #compute()} needs to be stand-alone, and cannot recursively call compute
-     * on its inputs, because programs are cyclic (have loops!) and this will just
-     * infinitely recurse until stack overflow.  Instead, compute typically
-     * computes a new type from the {@link #_type} field of its inputs.
-     */
-    public abstract Type compute();
-
-    // Set the type.  Assert monotonic progress.
-    // If changing, add users to worklist.
-    public Type setType(Type type) {
-        Type old = _type;
-        assert old == null || type.isa(old) : "Monotonicity test failed: "+this+"#"+_nid+" old="+old+" new="+type;
-        //assert !type.hasClosedBuilder0(); // New types should not have closed builders
-        if( old == type ) return old;
-        _type = type;       // Set _type late for easier assert debugging
-        CODE.addAll(_outputs);
-        moveDepsToWorklist();
-        return old;
-    }
-
-    @SuppressWarnings("unchecked")
-    public <N extends Node> N init() { _type = compute(); return (N)this; }
-
-    /**
-     * This function rewrites the current Node into a more "idealized" form.
-     * This is the bulk of our peephole rewrite rules, and we use this to
-     * e.g. turn arbitrary collections of adds and multiplies with mixed
-     * constants into a normal form that's easy for hardware to implement.
-     * Example: An array addressing expression:
-     * <pre>   ary[idx+1]</pre>
-     * might turn into Sea-of-Nodes IR:
-     * <pre>   (ary+12)+((idx+1) * 4)</pre>
-     * This expression can then be idealized into:
-     * <pre>   ary + ((idx*4) + (12 + (1*4)))</pre>
-     * And more folding:
-     * <pre>   ary + ((idx<<2) + 16)</pre>
-     * And during code-gen:
-     * <pre>   MOV4 Rary,[Ridx<<2 +16] // or some such hardware-specific notation </pre>
-     * <p>
-     * {@link #idealize} has a very specific calling convention:
-     * <ul>
-     * <li>If NO change is made, return {@code null}
-     * <li>If ANY change is made, return not-null; this can be {@code this}
-     * <li>The returned Node does NOT call {@link #peephole} on itself; the {@link #peephole} call will recursively peephole it.
-     * <li>Any NEW nodes that are not directly returned DO call {@link #peephole}.
-     * </ul>
-     * <p>
-     * Examples:
-     * <table border="3">
-     * <tr><th>    before       </th><th>       after     </th><th>return </th><th>comment  </th></tr>
-     * <tr><td>{@code (x+5)    }</td><td>{@code   (x+5)  }</td><td>{@code null  }</td><td>No change</td></tr>
-     * <tr><td>{@code (5+x)    }</td><td>{@code   (x+5)  }</td><td>{@code this  }</td><td>Swapped arguments</td></tr>
-     * <tr><td>{@code ((x+1)+2)}</td><td>{@code (x+(1+2))}</td><td>{@code (x+_) }</td><td>Returns 2 new Nodes</td></tr>
-     * </table>
-     *
-     * The last entry deserves more discussion.  The new Node {@code (1+2)}
-     * created in {@link #idealize} calls {@link #peephole} (which then folds
-     * into a constant).  The other new Node {@code (x+3)} does not call
-     * peephole, because it is returned and peephole itself will recursively
-     * call peephole.
-     * <p>
-     * Since idealize calls peephole and peephole calls idealize, you must be
-     * careful that all idealizations are <em>monotonic</em>: all transforms
-     * remove some feature, so that the set of available transforms always
-     * shrinks.  If you don't, you risk an infinite peephole loop!
-     *
-     * @return Either a new or changed node, or null for no changes.
-     */
-    public abstract Node idealize();
-
-    // Some of the peephole rules get complex, and search further afield than
-    // just the nearest neighbor.  These peepholes can fail the pattern match
-    // on a node some distance away, and if that node ever changes we should
-    // retry the peephole.  Track a set of Nodes dependent on `this`, and
-    // revisit them if `this` changes.
-    Ary<Node> _deps;
-    public int nDeps() { return _deps == null ? 0 : _deps.size(); }
-    public Node dep(int idx) { return _deps.at(idx); }
-
-    private boolean addDepImpl( Node dep ) {
-        // Running peepholes during the big assert cannot have side effects
-        // like adding dependencies.
-        if( CODE._midAssert ) return false;
-        if( CODE._obs != null ) CODE._obs.dep(this, dep);
-        if( dep._deps==null ) dep._deps = new Ary<>(Node.class);
-        if( dep._deps   .find(this) != -1 ) return false; // Already on list
-        if( dep._outputs.find(this) != -1 ) return false;
-        return true;
-    }
-
-    /**
-     * Add a node to the list of dependencies.  Only add it if it's not an input
-     * or output of this node, that is, it is at least one step away.  The node
-     * being added must benefit from this node being peepholed.
-     */
-    public <N extends Node> N addDep( N dep ) {
-        if( !addDepImpl(dep) ) return dep;
-        if( dep._inputs .find(this) != -1 ) return dep; // No need for deps on immediate neighbors
-        dep._deps.add(this);
-        return dep;
-    }
-
-    public <N extends Node> N addDepForwards( N dep ) {
-        if( !addDepImpl(dep) ) return dep;
-        dep._deps.add(this);
-        return dep;
-    }
-
-    // Move the dependents onto a worklist, and clear for future dependents.
-    public void moveDepsToWorklist( ) { moveDepsToWorklist(CODE._iter); }
-    public void moveDepsToWorklist( IterPeeps iter ) {
-        if( _deps == null ) return;
-        iter.addAll(_deps);
-        _deps.clear();
-    }
-
-    // Two nodes are equal if they have the same inputs and the same "opcode"
-    // which means the same Java class, plus same internal parts.
-    @Override public final boolean equals( Object o ) {
-        if( o==this ) return true;
-        if( o.getClass() != getClass() ) return false;
-        Node n = (Node)o;
-        int len = _inputs.size();
-        if( len != n._inputs.size() ) return false;
-        for( int i=0; i<len; i++ )
-            if( in(i) != n.in(i) )
-                return false;
-        return eq(n);
-    }
-    // Subclasses add extra checks (such as ConstantNodes have same constant),
-    // and can assume "this!=n" and has the same Java class.
-    public boolean eq( Node n ) { return true; }
-
-    // Cached hash.  If zero, then not computed AND this Node is NOT in the GVN
-    // table - and can have its edges hacked (which will change his hash
-    // anyway).  If Non-Zero then this Node is IN the GVN table, or is being
-    // probed to see if it can be inserted.  His edges are "locked", because
-    // hacking his edges will change his hash.
-    int _hash;
-
-    // If the _hash is set, then the Node is in the GVN table; remove it.
-    void unlock() {
-        if( _hash==0 ) return;
-        Node old = CODE._gvn.remove(this); // Pull from table
-        assert old==this;
-        _hash=0;                // Out of table now
-    }
-
-    // Hash of opcode and inputs
-    @Override public final int hashCode() {
-        if( _hash != 0 ) return _hash;
-        int hash = hash();
-        for( Node n : _inputs )
-            if( n != null )
-                hash = hash ^ (hash<<17) ^ (hash>>13) ^ n._nid;
-        if( hash==0 ) hash = 0xDEADBEEF; // Bad hash, so use some junky thing
-        return (_hash=hash);
-    }
-    // Subclasses add extra hash info (such as ConstantNodes constant)
-    int hash() { return 0; }
-
-    // ------------------------------------------------------------------------
-    //
-
-    /** Is this Node Memory related */
-    public boolean isMem() { return false; }
-
-    // ------------------------------------------------------------------------
-    // Peephole utilities
-
-    // Swap inputs without letting either input go dead during the swap.
-    public Node swap12() {
-        unlock();               // Hash is order dependent
-        _inputs.swap(1,2);
-        return this;
-    }
-
-    /**
-     * Does this node contain all constants?  Ignores in(0), as is usually
-     * control.  In an input is not a constant, we add dep as a dependency to
-     * it because dep can make progress if the input becomes a constant later.
-     * It is sufficient for one of the non-const inputs to have the dependency,
-     * so we don't bother checking the rest.
-     */
-    boolean allCons(Node dep) {
-        for( int i=1; i<nIns(); i++ )
-            if( !(in(i)._type.isConstant()) ) {
-                dep.addDep(in(i)); // If in(i) becomes a constant later, will trigger some peephole
-                return false;
-            }
-        return true;
-    }
-
-    // Make a shallow copy (same class) of this Node, with given inputs and
-    // empty outputs and a new Node ID.  The original inputs are ignored.
-    // Does not need to be implemented in isCFG() nodes.
-    Node copy(Node lhs, Node rhs) { throw Utils.TODO("Binary ops need to implement copy"); }
-
-    public Node copy() { return copyEmpty(); }
-
-    // Exact-class copy with fresh identity and no edges.  Unlike machine
-    // rematerialization copies, this never registers or copies input edges.
-    public final Node copyEmpty() {
-        Node n;
-        try { n = (Node)clone(); }
-        catch( Exception e ) { throw new RuntimeException(e); }
-        n._nid = CODE.getUID(); // allocate unique dense ID
-        n._inputs  = new Ary<>(Node.class);
-        n._outputs = new Ary<>(Node.class);
-        n._deps = null;
-        n._hash = 0;
-        if( n instanceof CallNode call ) CODE._calls.add(call);
-        return n;
-    }
-
-    // Report any post-optimize errors
-    public Parser.ParseException err() { return null; }
-
-    // Common integer constants
-    public static ConstantNode con(long x) { return (ConstantNode)ConstantNode.make(TypeInteger.constant(x)).peephole(); }
-
-    // Utility to walk the entire graph applying a function; return the first
-    // not-null result.
-    final public <E> E walk( Function<Node,E> pred ) {
-        assert CODE._visit.isEmpty();
-        E rez = _walk(pred);
-        CODE._visit.clear();
-        return rez;
-    }
-
-    private <E> E _walk( Function<Node,E> pred ) {
-        if( CODE._visit.get(_nid) ) return null; // Been there, done that
-        CODE._visit.set(_nid);
-        E x = pred.apply(this);
-        if( x != null ) return x;
-        for( Node def : _inputs  )  if( def != null && (x = def._walk(pred)) != null ) return x;
-        for( Node use : _outputs )  if( use != null && (x = use._walk(pred)) != null ) return x;
-        return null;
-    }
-
-
-    // If a Type upgrade happens, put on worklist
-    boolean _upgradeType( HashMap<String,Type> TYPES ) { return false; }
-    public final void upgradeType( HashMap<String,Type> TYPES ) {
-        Type old = _type;  _type = _type.upgradeType(TYPES);
-        boolean progress = _upgradeType(TYPES);
-        if( progress || old != _type ) {
-            CODE.add(this);
-            CODE.addAll(_outputs);
-            if( _deps!=null ) CODE.addAll(_deps);
-        }
-    }
-
-    /**
-     * Debugging utility to find a Node by index
-     */
-    public Node find(int nid) { return _find(nid, new BitSet()); }
-    private Node _find(int nid, BitSet bs) {
-        if( bs.get(_nid) ) return null; // Been there, done that
-        bs.set(_nid);
-        if( _nid==nid ) return this;
-        Node x;
-        for( Node def : _inputs  )  if( def != null && (x = def._find(nid,bs)) != null ) return x;
-        for( Node use : _outputs )  if( use != null && (x = use._find(nid,bs)) != null ) return x;
-        return null;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/NotNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/NotNode.java
deleted file mode 100644
index e22d16b6..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/NotNode.java
+++ /dev/null
@@ -1,25 +0,0 @@
-package com.seaofnodes.simple.node;
-
-
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-
-public class NotNode extends Node {
-    public NotNode(Node in) { super(null, in); }
-
-
-    @Override protected String format() { return "(!%1)"; }
-
-    @Override
-    public TypeInteger compute() {
-        Type t0 = in(1)._type;
-        if( t0.isHigh() )  return (TypeInteger)TypeInteger.BOOL.dual();
-        if( t0 == Type.NIL || t0 == TypeInteger.ZERO ) return TypeInteger.TRUE;
-        if( t0 instanceof TypeNil tn && tn.notNull() ) return TypeInteger.FALSE;
-        if( t0 instanceof TypeInteger i && (i._min > 0 || i._max < 0) ) return TypeInteger.FALSE;
-        return TypeInteger.BOOL;
-    }
-
-    @Override
-    public Node idealize() { return null; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/OrNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/OrNode.java
deleted file mode 100644
index 263c3e87..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/OrNode.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-
-public class OrNode extends ArithNode {
-    public OrNode( Parser.Lexer loc, Node lhs, Node rhs) { super(loc,lhs, rhs, (byte)1); }
-
-
-    @Override public String label() { return "Or"; }
-    @Override public String op() { return "|"; }
-    @Override long doOp( long x, long y ) { return x | y; }
-    @Override TypeInteger doOp(TypeInteger x, TypeInteger y) {
-        return TypeInteger.BOT;
-    }
-
-    @Override
-    public Node idealize() {
-        Node lhs = in(1);
-        Node rhs = in(2);
-
-        Type t1 = lhs._type;
-        Type t2 = rhs._type;
-
-        // Or of 0.  We do not check for (0|x) because this will already
-        // canonicalize to (x|0)
-        if( t2.isConstant() && t2 instanceof TypeInteger i && i.value()==0 && t1.isa(TypeInteger.BOT) && forceInt(lhs) )
-            return lhs;
-
-        // Move constants to RHS: con*arg becomes arg*con
-        if ( t1.isConstant() && !t2.isConstant() )
-            return swap12();
-
-        // Do we have ((x | (phi cons)) | con) ?
-        // Do we have ((x | (phi cons)) | (phi cons)) ?
-        // Push constant up through the phi: x | (phi con0|con0 con1|con1...)
-        Node phicon = AddNode.phiCon(this,true);
-        if( phicon!=null ) return phicon;
-
-        return super.idealize();
-    }
-    @Override Node copy(Node lhs, Node rhs) { return new OrNode(_loc,lhs,rhs); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ParmNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ParmNode.java
deleted file mode 100644
index 316efb93..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ParmNode.java
+++ /dev/null
@@ -1,95 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.type.*;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-public class ParmNode extends PhiNode {
-
-    // Argument indices are mapped one-to-one on CallNode inputs
-    public final int _idx;             // Argument index
-    public Type _declaredType;
-
-    public ParmNode(String label, int idx, Type declaredType, Node... inputs) {
-        super(label, inputs);
-        _idx = idx;
-        _declaredType = declaredType;
-        _type = declaredType;
-    }
-    public ParmNode(ParmNode parm) { super(parm, parm._label ); _idx = parm._idx; _declaredType = parm._declaredType; }
-
-
-    @Override public String label() { return MemOpNode.mlabel(_label); }
-
-    @Override boolean _upgradeType( HashMap<String,Type> TYPES) {
-        Type t = _declaredType.upgradeType(TYPES);
-        if( t == _declaredType ) return false;
-        unlock();
-        _declaredType = t;
-        return true;
-    }
-
-    public FunNode fun() { return (FunNode)in(0); }
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        if( fun()._name!=null && fun()._name.endsWith("<clinit>") && _label.equals("arg") )
-            return p.p("arg");
-        p.p("Parm_").p(_label).open();
-        for( Node in : _inputs ) p.n(in).p(",");
-        return p.unchar(',').close();
-    }
-
-
-    // Always in-progress until we run out of unknown callers
-    @Override public boolean inProgress() { return in(0) instanceof FunNode fun && fun.inProgress(); }
-
-    @Override
-    public Type compute() {
-        if( !(region() instanceof RegionNode r) )
-            return region()._type==Type.XCONTROL || region()._type==Type.TOP ? (_type instanceof TypeMem ? TypeMem.TOP : Type.TOP) : _type;
-        // During parsing Phis have to be computed type pessimistically.
-        if( r.inProgress() || in(nIns()-1)==null )
-            return _declaredType;
-        // Set type to local top of the starting type
-        Type t = Type.TOP;
-        for( int i = 1; i < nIns(); i++ ) {
-            // If the region's control input is live, add this as a dependency
-            // to the control because we can be peeped should it become dead.
-            Type ctrl = addDep(r.in(i))._type;
-            if( ctrl != Type.XCONTROL && ctrl != Type.TOP ) {
-                if( in(i)._type==Type.BOTTOM )
-                    return Type.BOTTOM;
-                t = t.meet(in(i)._type);
-            }
-        }
-        // Recursion is a loop in disguise. A Parm merges the first argument
-        // with those from recursive calls, just as a loop Phi merges its entry
-        // and backedge. Use the widening rule in PhiNode.compute here too.
-        // CallEndNode.compute handles the separate cycle through return values;
-        // widening this Parm alone cannot stop f(x-1)+1 from growing its result.
-        if( t instanceof TypeInteger ti && !ti.isHigh() && !ti.isConstant() )
-            t = ti.same_but_slightly_wider_than();
-        return t.join(_declaredType);
-    }
-
-    @Override
-    public Node idealize() {
-        if( !(region() instanceof FunNode) )
-            // A dead function can lose every caller before the Parm itself is
-            // removed; there is no replacement input in that transient form.
-            return nIns()==1 ? null : in(1); // Input has collapse to e.g. starting control.
-        // If function is folding, do all possible peeps
-        if( fun()._folding ) return super.idealize();
-
-        // Skip most phi optimizations on parms
-        return null;
-    }
-
-    @Override public boolean eq( Node n ) {
-        return ((ParmNode)n)._idx==_idx && super.eq(n);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/PhiNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/PhiNode.java
deleted file mode 100644
index 61e4b468..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/PhiNode.java
+++ /dev/null
@@ -1,275 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.*;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-public class PhiNode extends Node {
-
-    public final String _label;
-
-    public PhiNode( String label, Node... inputs) {
-        super(inputs);
-        _label = label;
-    }
-    public static PhiNode make(String label, Type minType, Node... inputs) {
-        return minType instanceof TypeMem mem
-            ? mem._alias==1
-                ? new BulkMemPhiNode(label,inputs)
-                : new MemPhiNode(label,mem._alias,inputs)
-            : new PhiNode(label, inputs);
-    }
-    // Used by ParmNode
-    public PhiNode(PhiNode phi, String label) { super(phi); _label = label; }
-    // Used by instruction Selection
-    public PhiNode(PhiNode phi) { this(phi,phi._label);  }
-    // Used by the infinite-loop exit breaker
-    public PhiNode(RegionNode r, Node sample) {
-        super(new Node[]{r});
-        _label = "";
-        _type = sample._type;
-        while( nIns() < r.nIns() )
-            addDef(sample);
-    }
-
-
-    @Override public String label() { return "Phi_"+MemOpNode.mlabel(_label); }
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        if( !(region() instanceof RegionNode r) || r.inProgress() )
-            p.p("Z");
-        p.p("Phi(");
-        for( Node in : _inputs ) p.n(in).p(",");
-        return p.unchar(',').close();
-    }
-
-    public CFGNode region() { return (CFGNode)in(0); }
-    @Override public boolean isMem() { return _type instanceof TypeMem; }
-
-    @Override
-    public Type compute() {
-        if( !(region() instanceof RegionNode r) )
-            return Type.TOP;
-        // During parsing Phis have to be computed type pessimistically.
-        if( r.inProgress() || in(nIns()-1)==null )
-            return Type.BOTTOM;
-        // Set type to local top of the starting type
-        Type t = Type.TOP;
-        for( int i = 1; i < nIns(); i++ ) {
-            // If the region's control input is live, add this as a dependency
-            // to the control because we can be peeped should it become dead.
-            Type ctrl = addDep(r.in(i))._type;
-            if( ctrl != Type.XCONTROL && ctrl != Type.TOP ) {
-                if( in(i)._type==Type.BOTTOM )
-                    return Type.BOTTOM;
-                t = t.meet(in(i)._type);
-            }
-        }
-
-        // Widen loop Phis so integer ranges cannot grow one step per trip forever.
-        // Recursion is a loop in disguise: ParmNode.compute widens arguments,
-        // and CallEndNode.compute widens results. Both are needed because the
-        // recursive result can feed itself without passing through a Parm.
-        // Above-center ranges may still fall to unwidened constants.
-        // Widen only below-center ranges to preserve monotonicity.
-        if( r instanceof LoopNode && // Only around loops
-            t instanceof TypeInteger ti && // Only widen integers
-            !ti.isHigh() && !ti.isConstant() ) {  // Only widen live ranges
-            // Widen, to prevent infinite falling of TypeIntegers
-            return ti.same_but_slightly_wider_than();
-        }
-
-        return t;
-    }
-
-    @Override
-    public Node idealize() {
-        RegionNode r = (RegionNode)region();
-        if( r.inProgress() || nOuts()==0 )
-            return null;        // Input is in-progress
-
-        // If we have only a single unique input, become it.
-        Node live = singleUniqueInput();
-        if( live != null )
-            return live;
-
-        // No bother if region is going to fold dead paths soon
-        for( int i=1; i<nIns(); i++ )
-            if( r.in(i)._type == Type.XCONTROL )
-                return null;
-
-        // Generic "pull down op"
-        Node progress;
-        if( same_op() && (progress = drop_same_op()) != null )
-            return progress;
-
-        // If merging Phi(ZERO, guardNZ(N)) at the matching `if(N)` join, the
-        // Phi is exactly N.  The guard arm proves N is non-zero, and the other
-        // arm contributes N's zero value.  This is only legal if N is already
-        // available at the Phi region; otherwise a return-scope/live-on-exit
-        // Phi can lose the zero arm and export a branch-local value upward.
-        Node unguard;
-        if( (unguard=matchingGuardMerge(r,1)) != null ) return unguard;
-        if( (unguard=matchingGuardMerge(r,2)) != null ) return unguard;
-
-        return null;
-    }
-
-    private Node matchingGuardMerge(RegionNode r, int nzIdx) {
-        Node zero = in(3-nzIdx);
-        if( !(in(nzIdx) instanceof GuardNode cast && cast._nonZero) ||
-            zero._type.makeZero()!=zero._type ||
-            cast.in(1)==this )
-            return null;
-        if( !(r.in(nzIdx) instanceof CProjNode nz && nz._idx==0 && nz.ctrl() instanceof IfNode iff) )
-            return null;
-        if( !(r.in(3-nzIdx) instanceof CProjNode z && z._idx==1 && z.ctrl()==iff) )
-            return null;
-        // Predicate was guarded?
-        Node n = cast.in(1), tested = null;
-        while( true ) {
-            if( iff.pred()==n ) tested = n;
-            if( !(n instanceof GuardNode guard && guard._nonZero) ) break;
-            n = guard.in(1);
-        }
-        CFGNode early = CFGNode.earlyCFG(n);
-        return tested!=null && (early==null || early.dominates(r,this)) ? n : null;
-    }
-
-    // Same op on all Phi paths; all ops have only the Phi as a use.
-    // None have a control input.
-    private boolean same_op() {
-        Node op = in(1);
-        if( op instanceof EscapeNode || op instanceof CFGNode || op instanceof ConstantNode || op instanceof PhiNode ||
-            op instanceof ProjNode || op instanceof NewNode || op instanceof ScopeNode || op instanceof MemMergeNode ) return false;
-        // A bulk Phi must split its aliases before factoring precise Stores.
-        if( this instanceof BulkMemPhiNode ) return false;
-        // Bulk splitting currently identifies parallel slices by Region/alias.
-        // Factoring can introduce another slice at a different memory point;
-        // wait until that Region's bulk partitioning has finished.
-        if( op instanceof MemOpNode )
-            for( Node use : region()._outputs )
-                if( use instanceof BulkMemPhiNode ) {
-                    addDepForwards(use);
-                    return false;
-                }
-        Node busy = null;
-        for( int i=1; i<nIns(); i++ ) {
-            Node n = in(i);
-            if( addDep(region().in(i))._type==Type.XCONTROL ||
-                op.getClass()!=n.getClass() || n.nIns()!=op.nIns() || n.in(0)!=null || !op.eq(n) ) return false;
-            if( n instanceof MemOpNode mem && !mem.canDrop((MemOpNode)op,this) ) return false;
-            // Moving a Store must remove the old effect, not duplicate it.
-            // Allow one shared arm: the other arms disappear into the single
-            // factored operation, usually reducing the total operation count.
-            addDepForwards(n);
-            if( n.nOuts()>1 ) {
-                for( Node use : n._outputs )
-                    if( use!=null && use!=this ) addDepForwards(use);
-                if( n instanceof StoreNode || busy!=null ) return false;
-                busy=n;
-            }
-            for( int j=1; j<n.nIns(); j++ )
-                if( n.in(j) instanceof ScopeNode || ((n.in(j)==null) != (op.in(j)==null)) ) return false;
-        }
-        return true;
-    }
-
-    private Node drop_same_op() {
-        Node op = in(1), cp = op.copyEmpty();
-        cp._type = null;
-        cp.addDef(null);
-        for( int j=1; j<op.nIns(); j++ ) {
-            Node x = op.in(j);
-            boolean different = false;
-            for( int i=2; i<nIns(); i++ )
-                if( in(i).in(j)!=x ) different=true;
-            if( different ) {
-                Node[] ins = new Node[nIns()];
-                ins[0] = region();
-                Type t = Type.TOP;
-                for( int i=1; i<nIns(); i++ ) {
-                    ins[i] = in(i).in(j);
-                    t = t.meet(ins[i]._type);
-                }
-                // Do not introduce an operand Phi mixing incompatible type families.
-                if( t==Type.BOTTOM ) {
-                    for( int i=1; i<ins.length; i++ ) addDep(ins[i]);
-                    cp.kill();
-                    return null;
-                }
-                PhiNode phi = j==1 && op instanceof MemOpNode mem
-                    ? new MemPhiNode(_label,mem._alias,ins)
-                    : PhiNode.make(_label,t,ins);
-                x = phi.peephole();
-            }
-            cp.addDef(x);
-        }
-        // Factoring must not widen the result (e.g. correlated And operands).
-        if( cp.compute().isa(compute()) ) return cp;
-        for( int i=1; i<nIns(); i++ )
-            for( int j=1; j<in(i).nIns(); j++ )
-                if( in(i).in(j)!=null ) addDep(in(i).in(j));
-        cp.kill();
-        return null;
-    }
-
-    /**
-     * If only single unique input, return it
-     */
-    private Node singleUniqueInput() {
-        if( region() instanceof LoopNode loop && loop.entry()._type == Type.XCONTROL )
-            return null;    // Dead entry loops just ignore and let the loop collapse
-        Node live = null;
-        for( int i=1; i<nIns(); i++ ) {
-            // If the region's control input is live, add this as a dependency
-            // to the control because we can be peeped should it become dead.
-            if( addDep(region().in(i))._type != Type.XCONTROL && in(i) != this )
-                if( live == null || live == in(i) ) live = in(i);
-                else return null;
-        }
-        return live;
-    }
-
-    @Override
-    boolean allCons(Node dep) {
-        if( !(region() instanceof RegionNode r) ) return false;
-        // When the region completes (is no longer in progress) the Phi can
-        // become a "all constants" Phi, and the "dep" might make progress.
-        dep.addDep(this);
-        if( r.inProgress() ) return false;
-        return super.allCons(dep);
-    }
-
-    // True if last input is null
-    public boolean inProgress() {
-        return in(nIns()-1) == null;
-    }
-
-    // Never equal if inProgress.
-    @Override public boolean eq( Node n ) {
-        return !inProgress() && super.eq(n);
-    }
-
-    @Override
-    public Parser.ParseException err() {
-        if( _type != Type.BOTTOM ) return null;
-
-        // Global BOTTOM retains the same role for non-scalar families.
-        for( int i=1; i<nIns(); i++ )
-            // Already an error, but better error messages come from elsewhere
-            if( in(i)._type == Type.BOTTOM )
-                return null;
-
-        SB sb = new SB().p("No common type amongst ");
-        for( int i=1; i<nIns(); i++ )
-            sb.p(in(i)._type.toString()).p(" and ");
-        return Parser.error(sb.unchar(5).toString(),null);
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/Proj.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/Proj.java
deleted file mode 100644
index c8b9378f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/Proj.java
+++ /dev/null
@@ -1,2 +0,0 @@
-package com.seaofnodes.simple.node;
-public interface Proj { int idx(); }
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ProjNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ProjNode.java
deleted file mode 100644
index a0142379..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ProjNode.java
+++ /dev/null
@@ -1,59 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeMem;
-import com.seaofnodes.simple.type.TypeTuple;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-public class ProjNode extends Node implements Proj {
-
-    // Which slice of the incoming multipart value
-    public final int _idx;
-
-    // Debugging label
-    public final String _label;
-
-    public ProjNode(Node ctrl, int idx, String label) {
-        super(new Node[]{ctrl});
-        _idx = idx;
-        _label = label;
-    }
-    public ProjNode(ProjNode p) { super(p); _idx = p._idx; _label = p._label; }
-
-
-    @Override public String label() { return _label; }
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        if( _label != null )  return p.p(_label);
-        if( in(0) instanceof CallEndNode cend && cend.call()!=null )
-            return p.n(cend.call());
-        return p.p("LONELY PROJ");
-    }
-
-    @Override public CFGNode cfg0() {
-        return in(0) instanceof CFGNode cfg ? cfg : in(0).cfg0();
-    }
-
-    @Override public boolean isMem() { return _type instanceof TypeMem; }
-
-    @Override
-    public Type compute() {
-        Type t = in(0)._type;
-        return t instanceof TypeTuple tt ? tt._types[_idx] : t.oob();
-    }
-
-    @Override public Node idealize() { return ((MultiNode)in(0)).pcopy(_idx,this); }
-
-    @Override
-    public boolean eq( Node n ) { return _idx == ((ProjNode)n)._idx; }
-
-    @Override
-    int hash() { return _idx; }
-
-    @Override public int idx() { return _idx; }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/PtrToIntMach.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/PtrToIntMach.java
deleted file mode 100644
index 9a9b94fd..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/PtrToIntMach.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.util.SB;
-
-/** Zero-code machine form of {@link PtrToIntNode}. */
-public class PtrToIntMach extends PtrToIntNode implements MachNode {
-    public PtrToIntMach(PtrToIntNode ptr) { super(ptr); }
-    @Override public String op() { return label(); }
-    @Override public RegMask regmap(int i) { assert i==1; return RegMask.FULL; }
-    @Override public RegMask outregmap() { return RegMask.FULL; }
-    @Override public int twoAddress() { return 1; }
-    @Override public void encoding(Encoding enc) { }
-    @Override public void asm(CodeGen code, SB sb) { sb.p(code.reg(in(1))); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/PtrToIntNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/PtrToIntNode.java
deleted file mode 100644
index 094734fa..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/PtrToIntNode.java
+++ /dev/null
@@ -1,36 +0,0 @@
-package com.seaofnodes.simple.node;
-
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.type.TypeMemPtr;
-
-
-/**
- * Reinterpret a non-null managed pointer as its raw integer address.
- *
- * This node changes representation families but emits no code.  No
- * control-dependent proof can turn a pointer into an integer; array-to-C-pointer
- * conversion adds the array body offset separately.
- */
-public class PtrToIntNode extends Node {
-    public PtrToIntNode(Node ptr) { super(null,ptr); }
-    public PtrToIntNode(PtrToIntNode ptr) { super(ptr); }
-
-
-    @Override protected String format() { return "(i64*)%1"; }
-
-    @Override public Type compute() {
-        return in(1)._type.isHigh() ? TypeInteger.TOP : TypeInteger.BOT;
-    }
-
-    @Override public Node idealize() { return null; }
-
-    @Override public Parser.ParseException err() {
-        Type t = in(1)._type;
-        if( t instanceof TypeMemPtr ptr )
-            return ptr.notNull() ? null : Parser.error("Cannot convert a nullable pointer to an integer",null);
-        return Parser.error("Cannot convert "+t.str()+" to an integer pointer",null);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ReadOnlyMach.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ReadOnlyMach.java
deleted file mode 100644
index a35f5a1d..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ReadOnlyMach.java
+++ /dev/null
@@ -1,19 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.util.SB;
-
-/**
- * Cast a pointer to read-only
- */
-public class ReadOnlyMach extends ReadOnlyNode implements MachNode {
-    public ReadOnlyMach( ReadOnlyNode n ) { super(n); }
-    @Override public String op() { return label(); }
-    @Override public RegMask regmap(int i) { assert i==1; return RegMask.FULL; }
-    @Override public RegMask outregmap() { return RegMask.FULL; }
-    @Override public int twoAddress( ) { return 1; }
-    @Override public void encoding( Encoding enc ) { }
-    @Override public void asm(CodeGen code, SB sb) { sb.p(code.reg(in(1))); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ReadOnlyNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ReadOnlyNode.java
deleted file mode 100644
index ab7e0ae0..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ReadOnlyNode.java
+++ /dev/null
@@ -1,27 +0,0 @@
-package com.seaofnodes.simple.node;
-
-
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeMemPtr;
-
-/**
- * Cast a pointer to read-only
- */
-public class ReadOnlyNode extends Node {
-    public ReadOnlyNode( Node n ) { super(null,n); }
-    public ReadOnlyNode( ReadOnlyNode n ) { super(n); }
-
-
-    @Override protected String format() { return "(const)%1"; }
-    @Override public Type compute() {
-        Type t = in(1)._type;
-        return t instanceof TypeMemPtr tmp ? tmp.makeRO() : t;
-    }
-
-    @Override public Node idealize() {
-        if( in(1)._type instanceof TypeMemPtr tmp && tmp.isFinal() )
-            return in(1);
-        return null;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/RegionNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/RegionNode.java
deleted file mode 100644
index 923773c4..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/RegionNode.java
+++ /dev/null
@@ -1,172 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.Type;
-import java.util.*;
-
-public class RegionNode extends CFGNode {
-    // Source location for late discovered errors
-    public Parser.Lexer _loc;
-
-    public RegionNode(Parser.Lexer loc, Node...   nodes) { super(nodes); _loc = loc; }
-    public RegionNode(RegionNode r, Parser.Lexer loc) { super(r); _loc = loc; }
-    public RegionNode(RegionNode r) { super(r); if( r!=null ) _loc = r._loc; }
-
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.p(label());
-    }
-
-    @Override public boolean blockHead() { return true; }
-
-    @Override
-    public Type compute() {
-        if( inProgress() ) return Type.CONTROL;
-        Type t = Type.XCONTROL;
-        for (int i = 1; i < nIns(); i++)
-            t = t.meet(in(i)._type);
-        return t;
-    }
-
-    @Override
-    public Node idealize() {
-        if( inProgress() ) return null;
-
-        Node progress = deadPath(false);
-        if( progress!=null ) return progress;
-
-        // If down to a single input, become that input
-        if( nIns()==2 && !hasPhi() )
-            return in(1);       // Collapse if no Phis; 1-input Phis will collapse on their own
-
-        // If a CFG diamond with no merging, delete: "if( pred ) {} else {};"
-        if( !hasPhi() && nIns()>3 &&  // No Phi users, just a control user
-                in(1) instanceof CProjNode p1 &&
-                in(2) instanceof CProjNode p2 &&
-                addDepForwards(p1).in(0)==addDepForwards(p2).in(0) &&
-                p1.in(0) instanceof IfNode iff ) {
-            // Replace with the iff.ctrl directly
-            if( nIns()==3 ) return iff.ctrl();
-            // Just delete the path for fat Regions
-            setDef(1,iff.ctrl());
-            return delDef(2);
-        }
-
-        // Flatten stacked regions (no loops involved)
-        if( getClass() == RegionNode.class && nIns()>2 ) {
-            for( int i=1; i<nIns(); i++ )
-                if( cfg(i) instanceof RegionNode region && region.getClass() == RegionNode.class && region.nIns()>2 && !hasMidUser(region) ) {
-                    assert !region.inProgress();
-                    // Fold Phis
-                    for( Node use : _outputs ) {
-                        if( use instanceof PhiNode phi ) {
-                            PhiNode phi2 = phi.in(i) instanceof PhiNode phi2x && phi2x.region()==region ? phi2x : null;
-                            for( int j=1; j<region.nIns(); j++ )
-                                phi.addDef(phi2==null ? phi.in(i) : phi2.in(j));
-                            CodeGen.CODE.add(phi);
-                        }
-                    }
-
-                    // Fold Region
-                    for( int j=1; j<region.nIns(); j++ )
-                        addDef(region.in(j));
-                    setDef(i,CodeGen.CODE.XCTRL);
-                    return this;
-                }
-        }
-
-        return null;
-    }
-
-    Node deadPath(boolean skipStart) {
-        // Delete dead paths into a Region
-        int path = findDeadInput(skipStart ? 2 :1);
-        if( path==0 ) return null;
-
-        // Do not delete the entry path of a loop (ok to remove the back edge
-        // and make the loop a single-entry Region which folds away the Loop).
-        // Folding the entry path confused the loop structure, moving the
-        // backedge to the entry point.
-        if( this instanceof LoopNode loop && loop.entry()==in(path) )
-            return null;
-        return removeDeadPath(path);
-    }
-
-    public Node removeDeadPath(int path) {
-        // Cannot use the obvious output iterator here, because a Phi deleting
-        // an input might recursively delete *itself*.  This shuffles the
-        // output array, and we might miss iterating an unrelated Phi. So on
-        // rare occasions we repeat the loop to get all the Phis.
-        int nouts = 0;
-        while( nouts != nOuts() ) {
-            nouts = nOuts();
-            for( int i=0; i<nOuts(); i++ )
-                if( out(i) instanceof PhiNode phi && phi.nIns()==nIns() ) {
-                    CodeGen.CODE.addAll(phi.in(path)._outputs);
-                    CodeGen.CODE.addAll(phi.delDef(path)._outputs);
-                }
-        }
-        if( !isDead() ) delDef(path);
-        return isDead() ? CodeGen.CODE.XCTRL : this;
-    }
-
-    private int findDeadInput(int startIdx) {
-        for( int i=startIdx; i<nIns(); i++ )
-            if( in(i)._type==Type.XCONTROL )
-                return i;
-        return 0;               // All inputs alive
-    }
-
-    boolean hasPhi() {
-        for( Node phi : _outputs )
-            if( phi instanceof PhiNode )
-                return true;
-        return false;
-    }
-
-    // Is there a value in-between 2 Regions?  Difficult to correctly fuse
-    // without extensive testing, so just ignore.
-    boolean hasMidUser(RegionNode r) {
-        for( Node use : r._outputs ) {
-            if( use==this ) continue;
-            if( use instanceof PhiNode ) {
-                for( Node data : use._outputs ) {
-                    if( !(data instanceof PhiNode phi2) || phi2.region()!=this )
-                    { addDep(use); if( data!=null ) addDep(data); return true; }
-                }
-            } else
-            { addDep(use);  return true; } // Control user
-        }
-        return false;
-    }
-
-
-    // Immediate dominator of Region is a little more complicated.
-    @Override public int idepth() {
-        if( validIDepth() ) return _idepth;
-        int depth=0;
-        for( Node n : _inputs )
-            if( n!=null )
-                depth = Math.max(depth,((CFGNode)n).idepth()+1);
-        return cacheIDepth(depth);
-    }
-
-    @Override public CFGNode idom(Node dep) {
-        CFGNode lca = null;
-        // Recompute from predecessors: CFG edits can change the dominator.
-        for( int i=1; i<nIns(); i++ )
-            if( !cfg(i)._type.isHigh() )
-                lca = cfg(i).domLCA(lca,dep);
-        return lca;
-    }
-
-    // True if last input is null
-    public boolean inProgress() { return nIns()>1 && in(nIns()-1) == null; }
-
-    // Never equal if inProgress
-    @Override public boolean eq( Node n ) { return !inProgress(); }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ReturnNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ReturnNode.java
deleted file mode 100644
index 0bb090ee..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ReturnNode.java
+++ /dev/null
@@ -1,129 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-/**
- * The Return node has two inputs.  The first input is a control node and the
- * second is the data node that supplies the return value.
- * <p>
- * In this presentation, Return functions as a Stop node, since multiple <code>return</code> statements are not possible.
- * The Stop node will be introduced in Chapter 6 when we implement <code>if</code> statements.
- * <p>
- * The Return's output is the value from the data node.
- */
-public class ReturnNode extends CFGNode {
-
-    public FunNode _fun;
-
-    public ReturnNode(Node ctrl, Node mem, Node data, Node rpc, FunNode fun ) {
-        super(ctrl, mem, data, rpc);
-        _fun = fun;
-    }
-    public ReturnNode( ReturnNode ret, FunNode fun ) { super(ret);  _fun = fun;  }
-
-
-    public Node ctrl() { return in(0); }
-    public Node mem () { return in(1); }
-    public Node expr() { return in(2); }
-    public Node rpc () { return in(3); }
-    @Override public FunNode fun() { return _fun; }
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        p.p("return ");
-        if( expr()==null ) p.p("----");
-        else p.n(expr());
-        return p.p(";");
-    }
-
-    // No one unique control follows; can be many call end sites
-    @Override public CFGNode uctrl() { return null; }
-
-    @Override
-    public Type compute() {
-        return TypeTuple.make(ctrl()._type,mem()._type,expr()._type);
-    }
-
-    @Override public Node idealize() {
-        if( _fun.isDead() ) return null;
-
-        // Upgrade signature based on return type
-        Type ret = expr()._type;
-        TypeFunPtr fcn = _fun.sig();
-        if( ret != fcn.ret() && ret.isa(fcn.ret()) )
-            _fun.setSig(fcn.makeFrom(ret));
-
-        return null;
-    }
-
-    @Override public Parser.ParseException err() {
-        if( ctrl()._type == Type.CONTROL &&
-            expr()._type == Type.TOP )
-            return Parser.error("No defined return type",null);
-        if( ctrl()._type == Type.CONTROL &&
-            expr()._type == TypeScalar.BOT )
-            return Parser.error("Cannot return generic scalar",null);
-        // With no user constructor, <init> doubles as the public no-arg
-        // constructor.  Required fields remain TOP in its private memory: a
-        // typed parser poison which deliberately emitted no Store or code.
-        if( ctrl()._type == Type.CONTROL && _fun.isInstance() ) {
-            TypeStruct self = ((TypeMemPtr)_fun.sig().arg(0))._obj;
-            if( !CodeGen.hasUserConstructor(self) && expr()._type instanceof TypeMem mem )
-                for( Field fld : self._fields ) {
-                    if( !(fld._t instanceof TypeNil tn && tn.notNull()) ) continue;
-                    Type actual = mem._alias==1 && mem._t instanceof TypeStruct ts
-                        ? ts.field(fld._fname)._t
-                        : mem._alias==fld._alias ? mem._t : Type.TOP;
-                    if( actual==Type.TOP || actual instanceof TypeNil atn && atn.nullable() )
-                        return Parser.error("'"+self._name+"' is not fully initialized, field '"+
-                                            fld._fname+"' is only partially set in the constructor",null);
-                }
-        }
-        return null;
-    }
-
-    @Override public boolean eq( Node n ) {
-        return !_fun.isDead() && !((ReturnNode)n)._fun.isDead();
-    }
-
-    // ------------
-    // MachNode specifics, shared across all CPUs
-    public String op() {
-        return _fun._frameAdjust > 0 ? "epilog" : "ret  ";
-    }
-    // Correct Nodes outside the normal edges
-    public void postSelect(CodeGen code) {
-        _fun.setRet(this);
-    }
-    public RegMask regmap(int i) {
-        return i==2
-            ? CodeGen.CODE._mach.retMask(_fun.sig())
-            : CodeGen.CODE._retMasks[i];
-    }
-    public RegMask outregmap() { return null; }
-    public void encoding( Encoding enc ) { throw Utils.TODO(); }
-    public void asm(CodeGen code, SB sb) {
-        int frameAdjust = fun()._frameAdjust;
-        if( frameAdjust>0 )
-            sb.p("\n").p("rsp += #").p(frameAdjust).p("\nret    ");
-        // Post code-gen, just print the "ret"
-        if( code._phase.ordinal() < CodeGen.Phase.RegAlloc.ordinal() ||
-            (code._phase.ordinal() == CodeGen.Phase.RegAlloc.ordinal() && !code._regAlloc.done()) )
-            // Prints return reg (either RAX or XMM0), RPC and then the
-            // callee-save registers.
-            for( int i=2; i<nIns(); i++ )
-                sb.p(code.reg(in(i))).p("  ");
-        // If we did not get the expected rpc, print which one we got
-        else if( code._regAlloc.regnum(rpc()) != code._mach.rpc() )
-            sb.p("[").p(code.reg(rpc())).p("]");
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/RoundF32Node.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/RoundF32Node.java
deleted file mode 100644
index 02d3bbaa..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/RoundF32Node.java
+++ /dev/null
@@ -1,33 +0,0 @@
-package com.seaofnodes.simple.node;
-
-
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeFloat;
-
-
-public class RoundF32Node extends Node {
-    public RoundF32Node(Node lhs) { super(null, lhs); }
-
-
-    @Override protected String format() { return "((f32)%1)"; }
-
-    @Override
-    public Type compute() {
-        if (in(1)._type instanceof TypeFloat i0 && i0.isConstant() )
-            return TypeFloat.constant((float)i0.value());
-        if( in(1)._type==TypeFloat.F64 ) return TypeFloat.F32;
-        return in(1)._type;
-    }
-
-    @Override
-    public Node idealize() {
-        Node lhs = in(1);
-        Type t1 = lhs._type;
-
-        // RoundF32 of float
-        if( t1 instanceof TypeFloat tf && tf._sz==32 )
-            return lhs;
-
-        return null;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/SarNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/SarNode.java
deleted file mode 100644
index fa63334b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/SarNode.java
+++ /dev/null
@@ -1,37 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-
-public class SarNode extends ArithNode {
-    public SarNode(Parser.Lexer loc, Node lhs, Node rhs) { super(loc, lhs, rhs, (byte)1); }
-
-
-    @Override public String op() { return ">>"; }
-    @Override long doOp( long x, long y ) { return x >> y; }
-    @Override TypeInteger doOp( TypeInteger x, TypeInteger y ) {
-        if( y.isConstant() ) {
-            int log = (int)y.value();
-            return TypeInteger.make(-1L<<(63-log),(1L<<(63-log))-1);
-        }
-        return TypeInteger.BOT;
-    }
-
-    @Override
-    public Node idealize() {
-        Node lhs = in(1);
-        Node rhs = in(2);
-
-        Type t2 = rhs._type;
-
-        // Sar of 0.
-        if( t2.isConstant() && t2 instanceof TypeInteger i && (i.value()&63)==0 && forceInt(lhs) && lhs._type instanceof TypeInteger )
-            return lhs;
-
-        // TODO: x >> 3 >> (y ? 1 : 2) ==> x >> (y ? 4 : 5)
-
-        return super.idealize();
-    }
-    @Override Node copy(Node lhs, Node rhs) { return new SarNode(_loc,lhs,rhs); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ScopeNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ScopeNode.java
deleted file mode 100644
index 694d5dcb..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ScopeNode.java
+++ /dev/null
@@ -1,719 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.Var;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.CompUnit;
-import com.seaofnodes.simple.codegen.ParseAll;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.Utils;
-import java.util.*;
-
-/**
- * The Scope node is purely a parser helper - it tracks names to nodes with a
- * stack of variables.
- */
-public class ScopeNode extends MemMergeNode {
-
-    /**
-     * The control is a name that binds to the currently active control
-     * node in the graph
-     */
-    public static final String CTRL = "$ctrl";
-    public static final String ARG0 = "arg";
-    public static final String MEM0 = "$mem";
-
-    // All active/live variables in all nested scopes, all run together.
-    // Maps 1-to-1 to the _inputs array.
-    public final Ary<Var> _vars;
-
-    // Lexical scope is typed:
-    public static class Kind {
-        // Basic block scoping
-        public static class Block extends Kind { }
-        // Constructor/initializer block for an allocated struct.
-        public static class Constructor extends Block {
-            public Constructor(TypeStruct self) { _self = self; }
-            public final TypeStruct _self;
-        }
-        // Function scope
-        public static class Func extends Kind {
-            public final String _name;
-            public final boolean _constructor;
-            public Func(String name) { this(name,false); }
-            public Func(String name, boolean constructor) { _name=name; _constructor=constructor; }
-        }
-
-        public int _lexSize;     // Number of Vars in this scope
-    }
-    public final Ary<Kind> _kinds;
-    // Lexical scope nesting depth
-    public int depth() { return _kinds._len; }
-    public Kind klast() { return _kinds.last(); }
-
-    // Extra guards; tested predicates and cast results
-    private final Ary<Node> _guards;
-
-    // A new ScopeNode
-    public ScopeNode() {
-        super();
-        _vars   = new Ary<>(Var .class);
-        _kinds  = new Ary<>(Kind.class);
-        _guards = new Ary<>(Node.class);
-    }
-
-    @Override public String label() { return "Scope"; }
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        p.p("Scope[ ");
-        int j=1;
-        for( int i=0; i<nIns(); i++ ) {
-            if( j < depth() && i == _kinds.at(j)._lexSize ) { p.p("| "); j++; }
-            Var v = var(i);
-            p.p(v._type());
-            p.p(" ");
-            if( v._final ) p.p("!");
-            p.p(v._name);
-            p.p("=");
-            Node n = in(i);
-            while( n instanceof ScopeNode loop ) {
-                p.p("Lazy_");
-                n = loop.in(i);
-            }
-            p.n(n);
-            p.p(", ");
-        }
-        return p.unchar(", ").p("]");
-    }
-
-
-    public Node ctrl() { return in(0); }
-    public Node mem() { return in(1); }
-    public Var var(int i) { return _vars.at(i); }
-
-    /**
-     * The ctrl of a ScopeNode is always bound to the currently active
-     * control node in the graph, via a special name '$ctrl' that is not
-     * a valid identifier in the language grammar and hence cannot be
-     * referenced in Simple code.
-     *
-     * @param n The node to be bound to '$ctrl'
-     *
-     * @return Node that was bound
-     */
-    public <N extends Node> N ctrl(N n) { return setDef(0,n); }
-    public Node mem(Node n) { return setDef(1,n); }
-
-    public void push( Kind kind ) {
-        kind._lexSize = _vars.size();
-        _kinds.push(kind);
-    }
-
-    // Pop a lexical scope
-    public void pop() {
-        promote(null);    // Promote forward references to the next outer scope
-        _pop();
-    }
-    // Pop a scope, no promote FRefs
-    public void _pop() {
-        int n = _kinds.pop()._lexSize;
-        popUntil(n);            // Pop off inputs going out of scope
-        _vars.setLen(n);        // Pop off variables going out of scope
-    }
-
-
-    // Look for forward references in the last lexical scope and promote to the
-    // next outer lexical scope.  At the last scope declare them an error.
-    public void promote(CodeGen code) {
-        Kind kind = klast();
-        int n = kind._lexSize;
-        for( int i=n; i<nIns(); i++ ) {
-            Var v = var(i);
-            Node vn = in(i);
-            if( !v.isFRef() ) continue;
-            // Shuffle vars and inputs to move the forward reference to
-            // *before* the start of the using scope ("as if" it was not
-            // actually a forward reference).
-            for( int j=n; j<=i; j++ ) {
-                Var  vtmp = var(j);
-                Node ntmp = in (j);
-                v._idx = j;
-                _vars  .set(j,v );
-                _inputs.set(j,vn);
-                v  = vtmp;
-                vn = ntmp;
-            }
-            kind._lexSize = ++n;
-        }
-    }
-
-
-    public boolean inFunction   () { return klast() instanceof Kind.Func; }
-    // Is any enclosing scope a constructor?
-    public boolean inConstructor() { return constructorSelf() != null; }
-    // Nearest constructor self type, if any.
-    public TypeStruct constructorSelf() {
-        for( int i=depth()-1; i>=0; i-- )
-            if( _kinds.at(i) instanceof Kind.Constructor ctor )
-                return ctor._self;
-            else if( _kinds.at(i) instanceof Kind.Func func && FunNode.isInstance(func._name) )
-                return ((TypeMemPtr)var(_kinds.at(i)._lexSize).type())._obj;
-        return null;
-    }
-
-    // Find nearest enclosing function scope
-    public int enclosingFunction() {
-        for( int i=depth()-1; i>=0; i-- )
-            if( _kinds.at(i) instanceof Kind.Func func && !FunNode.isInstance(func._name) )
-                return i;
-        throw Utils.TODO("Should not reach here");
-    }
-
-    // Find nearest enclosing function or declaration scope
-    public int enclosingFuncOrDecl() {
-        for( int i=depth()-1; i>=0; i-- )
-            if( _kinds.at(i) instanceof Kind.Func func )
-                return i;
-        throw Utils.TODO("Should not reach here");
-    }
-
-    // Which lexical scope contains this Var?
-    public int kindx( Var v ) {
-        for( int i=depth()-1; i>=0; i-- )
-            if( v._idx >= _kinds.at(i)._lexSize )
-                return i;
-        return -1;
-    }
-
-    // Which lexical scope contains this Var?
-
-
-    public int kindFcnx( Var v ) {
-        for( int i=depth()-1; i>=0; i-- )
-            if( v._idx >= _kinds.at(i)._lexSize && _kinds.at(i) instanceof Kind.Func )
-                return i;
-        throw Utils.TODO("Should not reach here");
-    }
-
-    // Which function scope contains this Var?
-    public Kind kindFcn( Var v ) {
-        int kx = kindFcnx(v);
-        return kx == -1 ? null : _kinds.at(kx);
-    }
-
-    // Final fields are writable local values inside their own initializer or
-    // constructor. Final parameters, local variables, and captured bindings
-    // remain final. Use the same rule when deciding which loop Phis to build.
-    public boolean canInit(Var v) {
-        int fx=enclosingFuncOrDecl();
-        Kind.Func fun=(Kind.Func)_kinds.at(fx);
-        if( !fun._constructor || v._extern!=0 ) return false;
-        int dx=FunNode.isInstance(fun._name) ? fx : fx-1;
-        return dx>=0 && kindx(v)==dx && v._idx>=_kinds.at(dx)._lexSize+2;
-    }
-
-    private boolean loopVar(Var v) {
-        return !v._final || (canInit(v) && !v.type().isHighOrConst());
-    }
-
-    // Find name in reverse, return an index into _vars or -1.  Linear scan
-    // instead of hashtable, but probably doesn't matter until the scan
-    // typically hits many dozens of variables.
-    public int find( String name ) {
-        for( int i=_vars.size()-1; i>=0; i-- )
-            if( var(i)._name.equals(name) )
-                return i;
-        return -1;
-    }
-
-    /**
-     * Create a new variable name in the current scope
-     */
-    public boolean define( String name, Type declaredType, boolean xfinal, Node init, Parser.Lexer loc ) {
-        assert _kinds.isEmpty() || name!=MEM0 ; // Later scopes do not define memory
-        if( depth() > 0 )
-            for( int i=_vars.size()-1; i>=klast()._lexSize; i-- ) {
-                Var n = var(i);
-                if( n._name.equals(name) ) {
-                    if( !n.isFRef() ) return false;       // Double define
-                    FRefNode fref = (FRefNode)in(n._idx); // Get forward ref
-                    if( !xfinal || !declaredType.isConstant() ) throw fref.err();  // Must be a final constant
-                    n.defFRef(declaredType,xfinal,loc);   // Declare full correct type, final, source location
-                    setDef(n._idx,fref.addDef(init));     // Set FRef to defined; tell parser also
-                    return true;
-                }
-            }
-        Var v = new Var(nIns(),name,declaredType,xfinal,loc,init==CodeGen.CODE.XCTRL);
-        _vars.add(v);
-        // Creating a forward reference
-        if( init==CodeGen.CODE.XCTRL )
-            //init = new FRefNode(v).init();
-            throw Utils.TODO();
-        addDef(init);
-        return true;
-    }
-
-    // Normal lookup was tried and failed.  Append a forward ref in the current
-    // lexical scope.  Scope pops promote it outwards "as if" the final constant
-    // had been declared before the using scope.
-
-    public Var defineFRef( String id, Type t, boolean xfinal, Parser.Lexer loc ) {
-        Var var = new Var(nIns(),id,t,xfinal,loc,true);
-        FRefNode fref = new FRefNode(id,loc).init();
-        fref._type = fref._con = t;
-        _vars.add(var);
-        addDef(fref);
-        return var;
-    }
-
-
-    // Parser state carries one complete, conservative memory value.  Precise
-    // alias partitions belong to the graph and are introduced by peepholes.
-    public Node mem( int alias ) {
-        assert alias == 1;
-        return in(update(var(1),null));
-    }
-    public void mem( int alias, Node st ) {
-        assert alias == 1;
-        update(var(1),st);
-    }
-
-
-    /**
-     * Lookup a name in all scopes starting from most deeply nested.
-     *
-     * @param name Name to be looked up
-     * @return null if not found, or the implementing Node
-     */
-    public Var lookup( String name ) {
-        int idx = find(name);
-        // -1 is missed in all scopes, not found
-        return idx == -1 ? null : update(var(idx),null);
-    }
-
-    /**
-     * Redefine an existing name
-     *
-     * @param name Name being redefined
-     * @param n    The node to bind to the name
-     */
-    public void update( String name, Node n ) {
-        int idx = find(name);
-        assert idx>=0;
-        update(var(idx),n);
-    }
-
-    public Var update( Var v, Node st ) {
-        Node old = in(v._idx);
-        if( old instanceof ScopeNode loop ) {
-            // Lazy Phi!
-            Node def = loop.in(v._idx);
-            old = def instanceof PhiNode phi && loop.ctrl()==phi.region()
-                // Loop already has a real Phi, use it
-                ? def
-                // Set real Phi in the loop head
-                // The phi takes its one input (no backedge yet) from a recursive
-                // lookup, which might have insert a Phi in every loop nest.
-                : loop.setDef(v._idx,PhiNode.make(v._name, v.type(), loop.ctrl(), loop.in(loop.update(v,null)._idx),null).init());
-            setDef(v._idx,old);
-        }
-        //assert !v._final || st==null;
-        if( st!=null ) setDef(v._idx,st); // Set new value
-        return v;
-    }
-
-    /**
-     * Duplicate a ScopeNode; including all levels, up to Nodes.  So this is
-     * neither shallow (would dup the Scope but not the internal HashMap
-     * tables), nor deep (would dup the Scope, the HashMap tables, but then
-     * also the program Nodes).
-     * <p>
-     * If the {@code loop} flag is set, the edges are filled in as the original
-     * Scope, as an indication of Lazy Phis at loop heads.  The goal here is to
-     * not make Phis at loop heads for variables which are never touched in the
-     * loop body.
-     * <p>
-     * The new Scope is a full-fledged Node with proper use<->def edges.
-     */
-    public ScopeNode dup() { return dup(false); }
-    public ScopeNode dup(boolean loop) {
-        ScopeNode dup = new ScopeNode();
-        // Our goals are:
-        // 1) duplicate the name bindings of the ScopeNode across all stack levels
-        // 2) Make the new ScopeNode a user of all the nodes bound
-        // 3) Ensure that the order of defs is the same to allow easy merging
-        dup._vars   .addAll(_vars   );
-        dup._kinds  .addAll(_kinds  );
-        dup._guards .addAll(_guards );
-        // The dup'd guards all need dup'd keepers, to keep proper accounting
-        // when later removing all guards
-        for( Node n : _guards )
-            if( !(n instanceof CFGNode) )
-                n.keep();
-        dup.addDef(ctrl());     // Control input is just copied
-
-        // Memory is one ordinary parser-state value.  At loop heads the
-        // Scope sentinel triggers the same lazy-Phi machinery as variables.
-        dup.addDef(loop ? this : mem());
-
-        // Copy of other inputs
-        for( int i=2; i<nIns(); i++ )
-            // For lazy phis on loops we use a sentinel
-            // that will trigger phi creation on update
-            dup.addDef(loop && loopVar(var(i)) ? this : in(i));
-        return dup;
-    }
-
-    /**
-     * Merges the names whose node bindings differ, by creating Phi node for such names
-     * The names could occur at all stack levels, but a given name can only differ in the
-     * innermost stack level where the name is bound.
-     *
-     * @param that The ScopeNode to be merged into this
-     * @return A new node representing the merge point
-     */
-    public RegionNode mergeScopes(ScopeNode that, Parser.Lexer loc) {
-        RegionNode r = ctrl(new RegionNode(loc,null,ctrl(), that.ctrl()).keep());
-        this._merge(that,r);
-        that.kill();            // Kill merged scope
-        CodeGen.CODE.add(r);
-        return r.unkeep();
-    }
-
-    public void _merge(ScopeNode that, RegionNode r) {
-        _merge(that,r,nIns());
-    }
-    public void _merge(ScopeNode that, RegionNode r, int max ) {
-        for( int i = 1; i < max; i++)
-            if( in(i) != that.in(i) ) { // No need for redundant Phis
-                // If we are in lazy phi mode we need to a lookup
-                // by name as it will trigger a phi creation
-                Var v = var(i);
-                Node lhs = this.in(this.update(v,null));
-                Node rhs = that.in(that.update(v,null));
-                setDef(i, PhiNode.make(v._name, v.type(), r, lhs, rhs).peephole());
-            }
-    }
-
-    // Balance arms of an IF.  Extra lonely defs are thrown: "if(pred) int x;".
-    // Forward refs are copied to the other side, "as if" they were there all along.
-    // 'this' scope is the default, 'scope' might have frefs.
-    public void balanceIf( ScopeNode scope ) {
-        if( nIns()==scope.nIns() )
-            return;             // Fast-path cutout
-        int kidx = enclosingFunction();
-        assert _kinds.at(kidx) == scope._kinds.at(kidx);
-        if( kidx==0 ) kidx = 1;
-        for( int i = _kinds.at(kidx-1)._lexSize; i < scope.nIns(); i++ ) {
-            Var n = scope.var(i);
-            if( i<nIns() && var(i)==n ) continue;
-            if( n.isFRef() ) {  // RHS has forward refs
-                _vars.insert(n,i);
-                insertDef(i,scope.in(i));
-            } else
-                throw Parser.error("Cannot define a '"+n._name+"' on one arm of an if",n._loc);
-        }
-    }
-
-    public void balanceLoopFRefs( ScopeNode scope ) {
-        for( int i = nIns(); i < scope.nIns(); i++ ) {
-            Var n = scope.var(i);
-            if( n.isFRef() ) {  // Loop body has forward refs
-                Var v = new Var(nIns(),n._name,n.type(),n._final,n._loc,true);
-                v._uninit = n._uninit;
-                _vars.add(v);
-                addDef(scope.in(i));
-            }
-        }
-    }
-
-
-    // ------------------------------------------------
-    // peephole the backedge scope into this loop head scope
-    // We set the second input to the phi from the back edge (i.e. loop body)
-    public void endLoop(ScopeNode back, ScopeNode exit ) {
-        Node ctrl = ctrl();
-        assert ctrl instanceof LoopNode loop && loop.inProgress();
-        ctrl.setDef(2,back.ctrl());
-
-        this._endLoop( this, back, exit);
-        back.kill();            // Loop backedge is dead
-        // Now one-time do a useless-phi removal
-        this._useless();
-    }
-
-    // Fill in the backedge of any inserted Phis
-    void _endLoop( ScopeNode scope, Node back, Node exit ) {
-        for( int i=1; i<nIns(); i++ ) {
-            if( !loopVar(var(i)) ) continue;
-            Node n = in(i);
-            if( var(i).type().isHighOrConst() && !(n instanceof PhiNode phi && phi.inProgress()) ) { // Cannot lift higher than a constant, so no Phi
-                Node con = ConstantNode.make(var(i).type()).init();
-                n.subsume(con);
-                n = con;
-            } else if( back.in(i) != scope ) {
-                PhiNode phi = (PhiNode)n;
-                assert phi.region()==scope.ctrl() && phi.in(2)==null;
-                phi.setDef(2,back.in(i)); // Fill backedge
-            }
-            if( exit.in(i) == scope ) // Replace a lazy-phi on the exit path also
-                exit.setDef(i,n);
-        }
-    }
-
-    // ------------------------------------------------
-    // Up-casting: using the results of an If to improve a value.
-    // E.g. "if( ptr ) ptr.field;" is legal because ptr is known not-null.
-    //
-    // This operation is lexical, not a full semantic theorem prover, and thus
-    // its behavior changes the language spec.  Optimizations that hide the
-    // lexical structure (e.g. constant folding control flow) can hide what is
-    // guarded or how the guard is applied, making it somewhat fragile.  Several
-    // good use cases are covered here, but not everything you might like.
-    //
-    // Simple lexical facts work well:
-    //
-    //  ```
-    //    if( ptr )
-    //        return ptr.field; // `ptr` is guarded non-null here.
-    //
-    //    if( a && a.ptr )
-    //        return a.ptr.x;   // `a` is guarded while parsing the RHS load,
-    //                          // and remains guarded on the true arm.
-    //  ```
-    //
-    // Short-circuit expressions are lowered as nested Phis.  We recursively
-    // decompose the recognized Phi shape, so chains such as:
-    //
-    //  ```
-    //    if( x && y && z )
-    //        use(x,y,z);
-    //  ```
-    //
-    // discover the nested `x && y` and then `x`, `y`, and `z`; this is not
-    // merely a one-level lookup.  Likewise, nested tests carry lexical guards
-    // inwards:
-    //
-    //  ```
-    //    if( x && y )
-    //        if( z && a )
-    //            if( x.ptr && z.ptr )
-    //                ...
-    //  ```
-    //
-    // Here `x` is already guarded while parsing the outer true arm, `z` while
-    // parsing the inner true arm, and both are available before the matching
-    // loads.  The later post-test decomposition is just a convenience for
-    // values still schedulable at the post-test control.
-    //
-    // The hard limit is that a semantic implication is not always a
-    // schedulable Node.  For `(x && y)`, the true side implies that `y` was
-    // true, but `y` might be a value computed only on the RHS control arm:
-    //
-    //  ```
-    //    val ptr = ...;
-    //    if( ptr && (ptr=fcn() ? 0 : arg ) {}
-    //  ```
-    //
-    // A Guard pinned after the Phi merge and using the branch-local `ptr`
-    // value would give that value a use above its defining arm.  GCM then has
-    // no legal block between the value's early control and the LCA of its
-    // uses.  Thus `_addGuards` first checks that the predicate's effective
-    // early CFG dominates the control where the Guard would be pinned.  If it
-    // does not, we skip that guard even if the fact is semantically true.
-    //
-    // A more complete answer would need a richer logical/proof node, or would
-    // need to rematerialize predicates on the guarded path instead of using
-    // branch-local nodes directly.  Plain GuardNodes are intentionally kept to
-    // facts represented by values already available at the guard control.
-    //
-    // TODO: Make this more robust for shapes like:
-    //  ```
-    //    if( !ary || !ary# ) exit(); // facts about ary are lost, despite the early exit
-    //    for( ...; ary# ) ...;
-    //  ```
-    // Here the guard ends up guarding the whole expression (both ary and ary#
-    // are not-null), but loses that ary is not-null.  A better answer might be
-    // a dedicated logical expression node, or some sort of gather-of-checked
-    // values to Guard post-test.
-
-    public void addGuards( CFGNode ctrl, Node pred, boolean invert ) {
-        _guards.add(ctrl);      // Marker between guard sets
-        // add pred & its cast to the normal input list, with special Vars
-        if( pred==null || pred.isDead() )
-            return;           // Dead, do not add any guards
-        _addGuards(ctrl,pred,invert);
-    }
-
-    private void _addGuards( CFGNode ctrl, Node pred, boolean invert ) {
-        if( pred==null || pred.isDead() )
-            return;
-        CFGNode early = CFGNode.earlyCFG(pred);
-        if( early != null && !early.dominates(ctrl,null) )
-            return;
-        // A single negation is handled below. For !!p (including p != null)
-        // or a negated short-circuit Phi, also discover the underlying facts.
-        if( pred instanceof NotNode not &&
-            (not.in(1) instanceof NotNode || not.in(1) instanceof PhiNode) ) {
-            pred.keep();        // Recursive peepholes may rediscover this Not.
-            _addGuards(ctrl,not.in(1),!invert);
-            pred.unkeep();
-        }
-        // Short-circuit logic is represented by a Phi.  For `a || b` being
-        // false, or `a && b` being true, both individual operands have the
-        // same proven value as the whole expression.  The "skipped RHS" path
-        // is the Region input whose Phi value is the controlling If predicate.
-        if( pred instanceof PhiNode phi && phi.nIns()==3 && phi.region() instanceof RegionNode r && r.nIns()==3 )
-            for( int i=1; i<3; i++ )
-                if( r.in(i) instanceof CProjNode prj && prj.ctrl() instanceof IfNode iff ) {
-                    Node skip = shortCircuitSkippedPred(phi.in(i),iff.pred(),prj,invert);
-                    if( skip != null ) {
-                        _addGuards(ctrl,skip,invert);
-                        _addGuards(ctrl,phi.in(3-i),invert);
-                        break;
-                    }
-                }
-        // Invert the If conditional
-        if( invert )
-            pred = pred instanceof NotNode not ? not.in(1) : CodeGen.CODE.add(new NotNode(pred).peephole());
-        Node zeroPred = pred instanceof NotNode not ? not.in(1) : null;
-        // This is a zero/null test.
-        // Compute the positive test type.
-        _addGuard(true,ctrl,pred);
-
-        // Compute the negative test type.
-        if( zeroPred != null )
-            _addGuard(false,ctrl,zeroPred);
-    }
-
-    private static Node shortCircuitSkippedPred( Node val, Node pred, CProjNode prj, boolean invert ) {
-        if( val == null )
-            return null;
-        if( val == pred )
-            return (prj._idx==0)==invert ? val : null;
-        if( val instanceof NotNode not && not.in(1)==pred )
-            return (prj._idx==1)==invert ? val : null;
-        if( val._type == TypeInteger.TRUE && invert )
-            return prj._idx==0 ? pred : CodeGen.CODE.add(new NotNode(pred).peephole());
-        if( val._type == TypeInteger.FALSE && !invert )
-            return prj._idx==1 ? pred : CodeGen.CODE.add(new NotNode(pred).peephole());
-        return null;
-    }
-
-    private void _addGuard(boolean nonZero, Node ctrl, Node pred) {
-        Node guard = new GuardNode(nonZero,ctrl,pred).peephole();
-        if( guard != pred ) {
-            pred.keep();
-            guard.keep();
-            _guards.add(pred);
-            _guards.add(guard);
-            replace(pred,guard,nonZero);
-        }
-    }
-
-
-    // Remove matching pred/cast pairs from this guarded region.
-    public void removeGuards( Node ctrl ) {
-        assert ctrl instanceof CFGNode;
-        // Pop the guards up to this region's marker.
-        while( true ) {
-            Node g = _guards.pop();
-            if( g == ctrl ) break;
-            if( g instanceof CFGNode ) continue;
-            g            .unkill(); // Pop/kill cast
-            _guards.pop().unkill(); // Pop/kill pred
-        }
-    }
-
-    // If we find a guarded instance of pred, replace with the upcasted version
-    public Node upcastGuard( Node pred ) {
-        // If finding an instanceof pred, replace with cast.
-        // Otherwise, just pred itself.
-        int i = _guards._len;
-        while( i > 0 ) {
-            Node  cast = _guards.at(--i);
-            if( cast instanceof CFGNode ) continue; // Marker between guard sets
-            Node xpred = _guards.at(--i);
-            if( xpred == pred )
-                return cast;
-        }
-        return pred;
-    }
-
-    // Kill guards also
-    @Override public void kill() {
-        for( Node n : _guards )
-            if( !(n instanceof CFGNode) )
-                n.unkill();
-        _guards.clear();
-        // Can have lazy uses remaining
-        if( isUnused() )
-            super.kill();
-    }
-
-
-    private void replace( Node old, Node cast, boolean nonZero ) {
-        assert old!=null && old!=cast;
-        for( int i=0; i<nIns(); i++ )
-            if( in(i)==old || nonZero && nullCheckedPhi(in(i),old) )
-                setDef(i,cast);
-    }
-
-    private static boolean nullCheckedPhi( Node n, Node old ) {
-        if( !(n instanceof PhiNode phi) || phi.nIns()!=3 )
-            return false;
-        if( phi.in(1)==null || phi.in(2)==null )
-            return false;
-        int zero = phi.in(1)._type == phi.in(1)._type.makeZero() ? 1 :
-                   phi.in(2)._type == phi.in(2)._type.makeZero() ? 2 : -1;
-        if( zero == -1 )
-            return false;
-        Node val = phi.in(3-zero);
-        return val==old ||
-            val instanceof GuardNode guard && guard._nonZero && guard.in(1)==old;
-    }
-
-    // ------------------------------------------------------------------------
-    // Insert a top-level public external symbol, "as-if" some #include/import
-    // was executed at the top of tile.
-    public Var insertExtern( ExternNode ext ) {
-        // Size of top-level scope
-        int lexSize = _kinds.at(0)._lexSize;
-        Var var = new Var(lexSize,ext._extern,ext._con,true,null);
-        insert(var,ext,0);
-        return var;
-    }
-
-    // ------------------------------------------------------------------------
-    // Insert a Var with Node n in the lex scope just prior to kidx
-    private void insert( Var var, Node n, int kidx ) {
-        // Insert just prior to scope kidx
-        int nidx = _kinds.at(kidx)._lexSize;
-        _vars.insert(var,nidx);
-        insertDef(nidx,n);
-        // All outer Kinds lexical offsets bump by one
-        for( int i = kidx; i < depth(); i++ )
-            _kinds.at(i)._lexSize++;
-        // All Vars outside the innermost lexical scope bump out one
-        for( int i=nidx+1; i<_vars._len; i++ )
-            var(i)._idx++;
-    }
-
-    // Save the existing Node state to an array
-    public Node[] save() {
-        Node[] olds = new Node[nIns()];
-        for( int i=0; i<nIns(); i++ )
-            olds[i] = in(i)==null ? null : in(i).keep();
-        return olds;
-    }
-
-    // Restore saved Node state back into scope
-    public void restore( Node[] olds ) {
-        assert olds.length<=nIns();
-        for( int i=0; i<olds.length; i++ )
-            setDef(i,olds[i]==null ? null : olds[i].unkeep());
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ShlNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ShlNode.java
deleted file mode 100644
index 380fc246..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ShlNode.java
+++ /dev/null
@@ -1,49 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-
-public class ShlNode extends ArithNode {
-    public ShlNode(Parser.Lexer loc, Node lhs, Node rhs) { super(loc, lhs, rhs, (byte)1); }
-
-
-    @Override public String op() { return "<<"; }
-    @Override long doOp( long x, long y ) { return x << y; }
-    @Override TypeInteger doOp( TypeInteger x, TypeInteger y ) {
-        if( x == TypeInteger.ZERO )
-            return TypeInteger.ZERO;
-        if( y.isConstant() ) {
-            int shf = (int)y.value();
-            // If no overflow, shift endpoints
-            if( !(((x._min<<shf)>>shf) != x._min ||
-                  ((x._max<<shf)>>shf) != x._max ) )
-                    return TypeInteger.make(x._min<<shf,x._max<<shf);
-        }
-        return TypeInteger.BOT;
-    }
-
-    @Override
-    public Node idealize() {
-        Node lhs = in(1);
-        Node rhs = in(2);
-
-        if( rhs._type instanceof TypeInteger shl && shl.isConstant() ) {
-            // Shl of 0.
-            if( (shl.value()&63)==0 && forceInt(lhs) && lhs._type instanceof TypeInteger )
-                return lhs;
-            // (x + c) << i  =>  (x << i) + (c << i)
-            if( lhs instanceof AddNode add && addDep(add).in(2)._type instanceof TypeInteger c && c.isConstant() ) {
-                long sum = c.value() << shl.value();
-                if( Integer.MIN_VALUE <= sum  && sum <= Integer.MAX_VALUE )
-                    return new AddNode(new ShlNode(_loc,add.in(1),rhs).peephole(), CodeGen.CODE.con(sum) );
-            }
-        }
-
-        // TODO: x << 3 << (y ? 1 : 2) ==> x << (y ? 4 : 5)
-
-        return super.idealize();
-    }
-    @Override Node copy(Node lhs, Node rhs) { return new ShlNode(_loc,lhs,rhs); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ShrNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ShrNode.java
deleted file mode 100644
index 17170a1f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ShrNode.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-
-public class ShrNode extends ArithNode {
-    public ShrNode(Parser.Lexer loc, Node lhs, Node rhs) { super(loc, lhs, rhs, (byte)1); }
-
-
-    @Override public String op() { return ">>>"; }
-    @Override long doOp( long x, long y ) { return x >>> y; }
-    @Override TypeInteger doOp( TypeInteger x, TypeInteger y ) {
-        return x == TypeInteger.ZERO ? x : TypeInteger.BOT;
-    }
-
-    @Override
-    public Node idealize() {
-        Node lhs = in(1);
-        Node rhs = in(2);
-        Type t2 = rhs._type;
-
-        // Shr of 0.
-        if( t2.isConstant() && t2 instanceof TypeInteger i && (i.value()&63)==0 && forceInt(lhs) && lhs._type instanceof TypeInteger )
-            return lhs;
-
-        // TODO: x >>> 3 >>> (y ? 1 : 2) ==> x >>> (y ? 4 : 5)
-
-        return super.idealize();
-    }
-    @Override Node copy(Node lhs, Node rhs) { return new ShrNode(_loc,lhs,rhs); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/SplitNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/SplitNode.java
deleted file mode 100644
index 3042f857..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/SplitNode.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.LRG;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.util.SB;
-
-public abstract class SplitNode extends MachConcreteNode {
-    public final LRG _lrg;      // Live range for split
-    public final String _kind;  // Kind of split
-    public final byte _round;   // Debugging info for which RegAlloc round
-    public SplitNode(LRG lrg,String kind, byte round, Node[] nodes) { super(nodes); _lrg=lrg; _kind = kind; _round = round; }
-    // A register-only transfer may need another split to reach stack storage.
-    public boolean isNonStackSplit() { return false; }
-    @Override public String op() { return "mov"; }
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        p.p("mov(");
-        if( in(1) == null ) p.p("---");
-        else p.n(in(1));
-        return p.close();
-    }
-    public FunNode fun(Encoding enc) { return enc._code._regAlloc.lrg(this)._fun; }
-    @Override public Type compute() { return in(0)._type; }
-    @Override public Node idealize() { return null; }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1)));
-    }
-    @Override public String comment() { return _kind + " #"+ _round; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/StartCUNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/StartCUNode.java
deleted file mode 100644
index 0f7a322a..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/StartCUNode.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.Type;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-// Start of a single compilation unit, distinct from the outer whole-program Start.
-public class StartCUNode extends StartNode {
-    public final String _fname;
-    public StartCUNode(StartNode start, StopCUNode stop, Type arg, String fname) { super(start,stop,arg);  _fname = fname;  }
-    public StartCUNode(StartCUNode start) { super(start); _fname = start._fname; }
-
-
-    @Override public CFGNode cfg0() { return (CFGNode)in(0); }
-
-    // IDom is cfg0() and depth is always Start+1 which is 0+1 or 1
-    @Override public int idepth() { return 1; }
-    @Override public CFGNode idom(Node dep) { return cfg0(); }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/StartNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/StartNode.java
deleted file mode 100644
index 3c605e30..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/StartNode.java
+++ /dev/null
@@ -1,87 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-import java.util.Arrays;
-import java.util.HashSet;
-
-/**
- * The Start node represents the external world calling, be it calling the
- * entry <clinit> or just some linked caller calling.
- * <p>
- * Start initially has 1 input (arg) from outside and the initial control.
- * In ch10 we also add mem aliases as structs get defined; each field in struct
- * adds a distinct alias to Start's tuple.
- * <p>
- * By ch25, Start is the external world (or linker) calling with everything
- * that has escaped.  Start is NOT the entry <clinit> itself, which can assume
- * no memory nor fidxs exist nor escaped.  Start gets escaped things from Stop;
- * together these close the Grand Cycle between the code we know and the code
- * we don't.
- */
-public class StartNode extends LoopNode implements MultiNode {
-
-    final Type _arg;
-
-    public StartNode(StartNode start, StopNode stop, Type arg) { super(null,start,stop); _arg = arg;  }
-    public StartNode(StartNode start) { super(start); _arg = start==null ? null : start._arg; }
-
-    public Type arg() { return _arg; }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.p(label());
-    }
-
-    @Override public CFGNode cfg0() { return null; }
-
-    // Get the one control following; error to call with more than one e.g. an
-    // IfNode or other multi-way branch.  For Start, it's the class init for
-    // this compilation unit.
-    @Override public CFGNode uctrl() {
-        // Find module.<clinit>, it's the start.
-        CFGNode C = null;
-        for( Node use : _outputs )
-            if( use instanceof FunNode fun && CodeGen.CODE.entryClinitName().equals(fun._name) )
-                { assert C==null; C = fun; }
-        if( C==null )
-            for( FunNode fun : CodeGen.CODE._linker )
-                if( fun!=null && !fun.isDead() && CodeGen.CODE.entryClinitName().equals(fun._name) )
-                    { assert C==null; C = fun; }
-        return C;
-    }
-
-    boolean escapedFIDX(int fidx) {
-        // Public class fields are callable by the unknown external world
-        // regardless of the current SCCP approximation of Start memory.
-        if( CodeGen.CODE.publicFIDX(fidx) ) return true;
-        if( !(_type instanceof TypeTuple tt) )
-            return !_type.isHigh(); // TOP never escapes, BOTTOM always escapes
-        TypeMem tmem = (TypeMem)tt._types[1];
-        if( tmem == TypeMem.BOT ) return false;
-        if( tmem == TypeMem.TOP ) return false;
-        if( XInt.isHigh(tmem._escFs) )
-            return false;
-        return XInt.bit(tmem._escFs,fidx);
-    }
-
-    @Override public TypeTuple compute() {
-        StopNode stop = (StopNode)in(1);
-        TypeMem tmem = stop._type instanceof TypeTuple tt
-            ? tt.mem()
-            : stop._type.isHigh() ? TypeMem.START : TypeMem.BOT;
-        assert tmem._alias==1 && !tmem._one;
-        return TypeTuple.make(Type.CONTROL,tmem,_arg);
-    }
-
-    @Override public Node idealize() { return null; }
-
-    // No immediate dominator, and idepth==0
-    @Override public int idepth() { return 0; }
-    @Override public CFGNode idom(Node dep) { return null; }
-
-    @Override public boolean eq( Node n ) { return true; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/StopCUNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/StopCUNode.java
deleted file mode 100644
index 53c2325c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/StopCUNode.java
+++ /dev/null
@@ -1,126 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-// Stop of a single compilation unit, distinct from the outer whole-program Stop.
-public class StopCUNode extends StopNode {
-    public StopCUNode() { super(); }
-    public StopCUNode(StopNode stop) { super(stop); }
-
-
-    public StartCUNode start() {
-        for( Node use : _outputs )
-            if( use instanceof StartCUNode start )
-                return start;
-        return null;
-    }
-
-    @Override
-    public TypeTuple compute() {
-        // During Parsing, new Stops and Returns are being added.  This Stop
-        // cannot know if more are coming, so must assume the worst.
-        if( CodeGen.CODE._phase ==null || CodeGen.CODE._phase == CodeGen.Phase.Parse )
-            return TypeTuple.STATE;
-
-        StartCUNode start = start();
-        // Memory start from all returns
-        TypeMem xmem = TypeMem.START;
-        // Escape summaries are monotone discovery facts.  In Opto, a Return
-        // can widen from a precise set to FULL; the public-only normalization
-        // below must not forget private bits already discovered precisely from
-        // that Return on an earlier SCCP step.
-        if( CodeGen.CODE._phase.ordinal() >= CodeGen.Phase.Opto.ordinal() &&
-            CodeGen.CODE._phase.ordinal() <= CodeGen.Phase.Lower.ordinal() &&
-            _type instanceof TypeTuple old && old.mem() instanceof TypeMem omem )
-            xmem = xmem.makeFrom(XInt.meet(xmem._escFs,omem._escFs),
-                                 XInt.meet(xmem._escAs,omem._escAs));
-
-        for( Node def : _inputs ) {
-            ReturnNode ret = (ReturnNode)def;
-            if( ret._type == Type.TOP ) continue;
-            if( !(ret._type instanceof TypeTuple tret) )
-                return TypeTuple.STATE; // Must be Type.BOTTOM
-
-            FunNode fun = ret.fun();
-            boolean noUserCtor = fun.isInstance() &&
-                !CodeGen.hasUserConstructor(((TypeMemPtr)fun.sig().arg(0))._obj);
-            // Instance <init> is an allocation helper, never an externally
-            // callable constructor when a user constructor exists.  Otherwise
-            // the same no-arg <init> is the public constructor.
-            boolean pub = fun.isPublic() && (fun.isClz() || noUserCtor);
-            TypeFunPtr sig = fun.sig();
-            // If public init, the function escapes and the related class escapes
-            if( pub ) {
-                xmem = xmem.escapes(sig);
-                // Classes also escape their public clazz pointer, which then
-                // escapes all their public fields.  Private fields do not
-                // escape, and are only available from the local class code.
-                if( fun.isClz() )
-                    xmem = xmem.escapesAliases(sig._sig[0]);
-            }
-
-            // The instance <init> Start edge supplies conservative pre-Opto
-            // inputs, but its private-memory result is consumed only by the
-            // allocation sequence and is never an externally visible return.
-            if( fun.isInstance() && !noUserCtor ) continue;
-
-            // Does this function escape?  If not, then no need to MEET
-            // here as its effects are not visible to the outside world.
-            addDepForwards(start); // Check again if function escapes
-            if( pub || start.escapedFIDX(sig.fidx()) ) {
-                // External callers already hold their object arguments, so
-                // writes through those arguments expose addresses too.
-                for( Node use : fun._outputs )
-                    if( use instanceof ParmNode p && p._idx>=2 )
-                        xmem=publicBottom(xmem.escapes(addDepForwards(p)._type));
-                if( tret.ctl().isHigh() ) continue; // Return not reachable
-                // Capture (precisely?) all escaping pointer aliases and fidxs.
-                // Escaped fidxs means the linked world can call that function;
-                // escaped aliases means the linked world can R/W those aliases.
-                xmem = xmem.escapes(tret.ret());
-                xmem = publicBottom(xmem);
-                xmem = (TypeMem)xmem.meet(publicBottom(tret.mem(),xmem));
-            }
-        }
-        // Native retention is shared by the whole program, including calls
-        // on paths with no Return. A class boundary must not hide it.
-        for( CallNode call : CodeGen.CODE._calls )
-            if( !call.isDead() ) xmem=publicBottom(xmem.escapes(call.exposed(this)));
-        assert xmem._alias==1 && !xmem._one;
-        return TypeTuple.make(Type.CONTROL,xmem,Type.BOTTOM);
-    }
-
-    // FULL escape sets arise from global BOTTOM.  Across a compilation-unit
-    // boundary global BOTTOM exposes every public field, while retaining any
-    // private escapes already discovered precisely.
-    private TypeMem publicBottom(TypeMem mem) { return publicBottom(mem,mem); }
-    private TypeMem publicBottom(TypeMem mem, TypeMem prior) {
-        // The pessimistic Iter pass naturally lifts transient FULL inputs to
-        // precise finite sets.  Replacing FULL early there would let a later
-        // input refinement add bits, reversing Iter's monotonic direction.
-        // This normalization is needed only for Opto's optimistic grand cycle.
-        if( CodeGen.CODE._phase.ordinal() < CodeGen.Phase.Opto.ordinal() ||
-            CodeGen.CODE._phase.ordinal() > CodeGen.Phase.Lower.ordinal() ) return mem;
-        int[] escFs = XInt.isHigh(mem._escFs)
-            ? XInt.meet(prior._escFs,CodeGen.CODE.publicFIDXs())
-            : mem._escFs;
-        int[] escAs = XInt.isHigh(mem._escAs)
-            ? XInt.meet(prior._escAs,CodeGen.CODE.publicAliases())
-            : mem._escAs;
-        return escFs==mem._escFs && escAs==mem._escAs ? mem : mem.makeFrom(escFs,escAs);
-    }
-
-    @Override
-    public Node idealize() {
-        int len = nIns();
-        for( int i=0; i<nIns(); i++ )
-            if( in(i) instanceof ReturnNode ret && addDep(ret.fun()).isDead() )
-                delDef(i--);
-        if( len != nIns() ) return this;
-        return null;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/StopNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/StopNode.java
deleted file mode 100644
index 7238f1f9..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/StopNode.java
+++ /dev/null
@@ -1,94 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-// A collection of function ReturnNodes for a compilation unit.
-public class StopNode extends CFGNode {
-
-    public StopNode() {
-        super();
-        _type = compute();
-    }
-    public StopNode(StopNode stop) { super(stop); }
-
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        // For the sake of many old tests, and single value prints as "return val"
-        ReturnNode ret1 = null;
-        for( Node n : _inputs ) {
-            if( n instanceof ReturnNode ret ) {
-                if( ret1 != null ) { ret1=null; break; }
-                ret1 = ret;
-            }
-        }
-        if( ret1!=null ) return p.n(ret1);
-
-        p.p("Stop[ ");
-        for( Node n : _inputs )
-            if( n instanceof ReturnNode ret ) {
-                String name = ret.fun()._name;
-                if( name== null || !name.startsWith("sys.") )
-                    p.n(ret).p(" ");
-            }
-        return p.p("]");
-    }
-
-    @Override public boolean blockHead() { return true; }
-
-
-    // If a single Return, return it.
-    // Otherwise, null because ambiguous.
-    public ReturnNode ret() {
-        ReturnNode ret1 = null;
-        for( Node n : _inputs ) {
-            // TODO: remove isPublic
-            if( n instanceof ReturnNode ret && ret.fun().isPublic() ) {
-                if( ret1 != null ) return null; // Ambiguous
-                ret1 = ret;
-            }
-        }
-        return ret1;
-    }
-
-    @Override
-    public TypeTuple compute() {
-        // During Parsing, new Stops and Returns are being added.  This Stop
-        // cannot know if more are coming, so must assume the worst.
-        if( CodeGen.CODE._phase ==null || CodeGen.CODE._phase == CodeGen.Phase.Parse )
-            return TypeTuple.STATE;
-
-        // Just meet-over-inputs.
-        TypeTuple tt = TypeTuple.STOP_HIGH;
-        for( Node def : _inputs )
-            tt = (TypeTuple)tt.meet(def._type);
-        assert tt.mem()._alias==1 && !tt.mem()._one;
-        return tt;
-    }
-
-    @Override public Node idealize() {
-        int len = nIns();
-        for( int i=0; i<nIns(); i++ )
-            if( in(i).nIns()==0 )
-                delDef(i--);
-        if( len != nIns() ) return this;
-        return null;
-    }
-
-    @Override public int idepth() {
-        if( validIDepth() ) return _idepth;
-        int d=0;
-        for( Node ret : _inputs )
-            // All public results are hooked on the Stop, including data
-            // values, so must check CFG
-            if( ret instanceof CFGNode cfg )
-                d = Math.max(d,cfg.idepth()+1);
-        return cacheIDepth(d);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/StoreNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/StoreNode.java
deleted file mode 100644
index bdd07c8d..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/StoreNode.java
+++ /dev/null
@@ -1,326 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.*;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-import java.util.HashMap;
-import java.util.IdentityHashMap;
-
-/**
- * Store represents setting a value to a memory based object, in chapter 10
- * this means a field inside a struct.
- */
-public class StoreNode extends MemOpNode {
-
-    final boolean _init; // Initializing writes are allowed to write null
-    // Semantic store width in bytes.  Zero is the sole undecided state;
-    // otherwise hardware and ideal Stores are the 1/2/4/8-byte variants.
-    private byte _size;
-
-    /**
-     * @param name  The struct field we are assigning to
-     * @param mem   The memory alias node - this is updated after a Store
-     * @param ptr   The ptr to the struct base where we will store a value
-     * @param off   The offset inside the struct base
-     * @param value Value to be stored
-     */
-    public StoreNode(Parser.Lexer loc, String name, int alias, Type decl, Node ctrl, Node mem, Node ptr, Node off, Node value, boolean init) {
-        this(loc,name,alias,decl,ctrl,mem,ptr,off,value,init,(byte)0);
-    }
-    private StoreNode(Parser.Lexer loc, String name, int alias, Type decl, Node ctrl, Node mem, Node ptr, Node off, Node value, boolean init, byte size) {
-        super(loc, name, alias, false, decl, ctrl, mem, ptr, off, value);
-        _init = init;
-        _size = size;
-    }
-
-
-    @Override boolean canDrop(MemOpNode other, Node dep) {
-        return super.canDrop(other,dep) && _init==((StoreNode)other)._init;
-    }
-
-    // Debugger label
-    @Override public String  label() { return "st_"+mlabel(); }
-    @Override public boolean isMem() { return true; }
-
-    public Node nnptr() {
-        if( !(ptr() instanceof GuardNode cast) ) return ptr();
-        assert cast._nonZero;
-        return cast.in(1);
-    }
-    public Node val() { return in(4); }
-    public int storeSize() { assert _size==1 || _size==2 || _size==4 || _size==8; return _size; }
-    public int log_size() { return Integer.numberOfTrailingZeros(storeSize()); };
-
-    @Override
-    protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        return p.p(".").p(_name).p("=").p( val()).p(";");
-    }
-
-    @Override
-    public Type compute() {
-        Type val  = val()._type;
-        Type mem0 = mem()._type;
-        Type ptr0 = ptr()._type;
-        // Validate argument types
-        if( ptr0.isHigh() )
-            return TypeMem.TOP;
-        if( !(mem0 instanceof TypeMem    mem) ||
-            !(ptr0 instanceof TypeMemPtr ptr) )
-            return mem0.isHigh() || ptr0==Type.NIL ? TypeMem.TOP : TypeMem.BOT;
-
-        // Sharpen memory value; required for narrowing stores where the parser
-        // inserts zero/sign masking and somebody reads the TypeMem type.
-        Type decl = declaredType();
-        if( decl != Type.BOTTOM )
-            { assert decl != Type.TOP; val = val.join(decl); }
-        // A singleton class's final constant field lives in the static image.
-        // Its precise memory slice is a constant too; ordinary peepholes can
-        // replace this Store before scheduling or instruction selection.
-        // A constant runtime value alone is not enough: mutable fields (notably
-        // $init) still need their writes, and instance fields need allocation.
-        Field fld = ptr._obj.field(_name);
-        if( _alias!=1 && ptr._one && Parser.startsClzPrefix(ptr._obj._name) &&
-            fld!=null && fld._final && decl.isConstant() )
-            return TypeMem.make(_alias,val,true,true,true,mem._escFs,mem._escAs).escapesFrom(val);
-
-        // Allocation uses a private TypeMem and nothing else does.  This
-        // memory is truly private; a temporary singleton until it escapes -
-        // which is never does in a constructor.
-        if( !_name.equals("[]") && mem._one )
-            // Just track the stored value
-            return TypeMem.make(_alias,val,true,false,_init,null,null).escapesFrom(val);
-
-        // Normal aliasing Store.
-        assert mem._alias==1 || mem._alias==_alias; // Perfect aliasing
-
-        // Single alias store.  If memory is fat, attempt to get a narrow slice.
-        Type tfld = mem._alias==1 && mem._t instanceof TypeStruct ts
-            ? ts._fields[ts.findAlias(_alias)]._t
-            : mem._t;
-
-        // Same alias, meet into other fields.
-        Type t = val.meet(tfld);
-        // Bulk memory's final bit describes its conservative remainder, not
-        // this newly precise slice.  Slice finality comes from the field.
-        boolean xfinal = fld != null && fld._final;
-        return TypeMem.make(_alias,t,mem._one,mem._clz,xfinal,mem._escFs,mem._escAs).escapesFrom(val);
-    }
-
-    @Override
-    public Node idealize() {
-        // Freeze the semantic Store variant as soon as the pointer exposes a
-        // canonical field declaration.  Waiting until after structural memory
-        // peeps can lose the declaration to a flow-sensitive constant field
-        // state.
-        if( _size==0 && (_size= storageType()) != 0 ) {
-            unlock();           // Width participates in the cached hash.
-            return init();
-        }
-
-        assert !(mem()._type instanceof TypeMem mem) || _alias == 1 || mem._alias == 1 || _alias == mem._alias;
-
-        // Simple store-after-MemMerge to a known alias can bypass.  Happens when inlining.
-        Node mem = mem();
-        if( _alias != 1 && mem instanceof MemMergeNode merge ) {
-            setDef(1,merge.alias(_alias));
-            return this;
-        }
-
-        Field fld;
-        if( _alias==1 && ptr()._type instanceof TypeMemPtr tmp && (fld=tmp._obj.field(_name)) != null && _size != 0 ) {
-            // Expand Store(bulkMem,alias#1) into MemMerge(bulkMem,#N:Store(bulkMem,alias#N)).
-
-            // Normally I'd like to just drop in this xform and move on, but
-            // users of the bulk Store memory might nontheless depend on the
-            // sharp memory type (e.g. I64) from the store's memory.  Using the
-            // MemMerge means using the bulk memory which e.g. might be BOT.
-            // Check for store users with the same alias, and use the new store
-            // directly, preserving the sharper graph.
-            Node st = new StoreNode(_loc,_name,fld._alias,fld._t,in(0),mem,ptr(),off(),val(),_init,_size).peephole();
-            for( int i=0; i<nOuts(); i++ ) {
-                Node use = out(i);
-                if( useAlias(use)==fld._alias ) {
-                    int idx = use._inputs.find(this);
-                    assert idx != -1;
-                    CodeGen.CODE.add(use).setDef(idx,st);
-                    i--;        // setDef removed use from this Store's outputs
-                }
-            }
-            MemMergeNode mmm = mem instanceof BulkMemPhiNode bulk
-                ? bulk.aggregate(mem,fld._alias,st)
-                : new MemMergeNode(null,mem);
-            if( !(mem instanceof BulkMemPhiNode) )
-                mmm.alias(fld._alias,st);
-            return mmm.init();
-        }
-
-        // Simple store-after-store on same address.  Should pick up the
-        // required init-store being stomped by a first user store.
-        if( mem instanceof StoreNode st &&
-            ptr()==st.ptr() &&  // Must check same object
-            off()==st.off() &&  // And same offset (could be "same alias" but this handles arrays to same index)
-            ptr()._type instanceof TypeMemPtr && // No bother if weird dead pointers
-            // Must have exactly one use of "this" or you get weird
-            // non-serializable memory effects in the worse case.
-            checkOnlyUse(st) ) {
-            assert _name==st._name; // Equiv class aliasing is perfect
-            setDef(1,st.mem());
-            return this;
-        }
-
-        // Private constructor memory describes the value that the next helper
-        // reads. Keep its conversion, even if a machine store could truncate it.
-        // This is the same rule as in the construction and escape chapters.
-        boolean priv = mem()._type instanceof TypeMem tm && tm._one;
-        // Value is automatically truncated by narrow store
-        if( !priv && _size!=0 && val() instanceof AndNode and && and.in(2)._type.isConstant()  ) {
-            int log = log_size();
-            if( log<3 ) {       // And-mask vs narrow store
-                long mask = ((TypeInteger)and.in(2)._type).value();
-                long bits = (1L<<(8<<log))-1;
-                // Mask does not mask any of the stored bits
-                if( (bits&mask)==bits )
-                    // So and-mask is already covered by the store
-                    { setDef(4,and.in(1)); return this; }
-            }
-        }
-
-        // Store will chop high order bits off; math to change those bits can be dropped.
-        if( !priv && _size!=0 && val() instanceof SarNode shr &&
-            shr.in(1) instanceof ShlNode shl &&
-            shr.in(2)._type.isConstant() &&
-            shl.in(2)._type.isConstant() ) {
-            TypeInteger shrC = (TypeInteger) shr.in(2)._type;
-
-            // size of the thing that sign-extends
-            int base_size = (1 << shr.in(1)._type.log_size()) << 3;
-            int not_affected_bits = base_size - (int) shrC.value();
-            int store_size = (1 << log_size()) << 3;
-            // if the store is unrelated to the shift amount, then get rid of the shift
-            if( shl.in(2)._type == shr.in(2)._type && shrC.value() >= store_size && not_affected_bits >= store_size) {
-                setDef(4, shl.in(1));
-                return this;
-            }
-        }
-
-        return null;
-    }
-
-    // Flow-sensitive pointer types can carry a current field value (e.g. the
-    // constant zero in a u32 field).  Storage width comes from the canonical
-    // struct declaration.  If the pointer/definition is not available yet,
-    // leave the Store undecided instead of consulting the value or `_con`.
-    private byte storageType() {
-        if( !(ptr()._type instanceof TypeMemPtr tmp) )
-            return 0;
-        TypeStruct obj = (TypeStruct)Parser.TYPES.get(tmp._obj._name);
-        Field fld = obj.field(_name);
-        if( fld == null || fld._t == null )
-            return 0;
-        if( fld._t == Type.BOTTOM )
-            return 0; // Store into a final field
-        assert fld._t != Type.TOP;
-        // Freshly parsed field stores retain the declaring structure on their
-        // symbolic offset even after the pointer's flow type sharpens.
-        if( fld._t.isConstant() ) {
-            if( !(off() instanceof ConFldOffNode coff) )
-                return 0;
-            fld = coff._ts.field(_name);
-            if( fld == null || fld._t == null )
-                return 0;
-        }
-        // Compute storage size from field type
-        byte size = (byte)(1 << fld._t.log_size());
-        assert size==1 || size==2 || size==4 || size==8;
-        return size;
-    }
-
-    // Alias required by a direct consumer of this Store's memory result.
-    // Keep in sync with BulkMemPhiNode.outputAlias.
-    private int useAlias(Node use) {
-        return switch( use ) {
-        case MemOpNode mem -> mem._alias;
-        case MemPhiNode phi -> phi._alias;
-        case EscapeNode esc -> esc.pub()==this ? esc.fld()._alias : 0;
-        default -> 0;
-        };
-    }
-
-    // Phi(mem, Store(phi,ptr,off,val)) -> Store(mem,ptr,off,Phi(load(mem),val)).
-    // With no observers of the backedge store, only the last value matters.
-    // The entry load preserves the field even when the loop takes zero trips.
-    Node sink(MemPhiNode phi) {
-        phi.addDepForwards(this);
-        if( nOuts()!=1 || _alias==1 || _size==0 || _init ) return null;
-        phi.addDep(ptr());
-        // Start with a fixed field of an allocation dominating the loop.
-        // In particular, do not sink stores through a loop-varying address.
-        if( !(ptr() instanceof ProjNode p) || !(p.in(0) instanceof NewNode obj) ||
-            !(ptr()._type instanceof TypeMemPtr tmp) || tmp._obj.isAry() ||
-            !(off() instanceof ConstantNode) || err()!=null ) return null;
-        LoopNode loop = (LoopNode)phi.region();
-        // Bulk splitting identifies precise slices by Region/alias. Finish it
-        // before replacing this memory point with a Store.
-        for( Node use : loop._outputs )
-            if( use instanceof BulkMemPhiNode ) {
-                phi.addDepForwards(use);
-                return null;
-            }
-        phi.addDep(obj);
-        CFGNode ctrl = loop.entry();
-        while( ctrl!=null && ctrl!=obj.cfg0() ) {
-            phi.addDep(ctrl);
-            ctrl=ctrl.idom(phi);
-        }
-        if( ctrl==null ) return null;
-
-        Node mem = phi.in(1);
-        Node init = new LoadNode(_loc,_name,_alias,null,mem,ptr(),off()).peephole();
-        Node value = CodeGen.CODE.add(new PhiNode(_name,loop,init,val()).peephole());
-        Node sink = new StoreNode(_loc,_name,_alias,_con,null,mem,ptr(),off(),value,_init,_size);
-        // Break the memory cycle, killing the old store. Keep the Phi alive
-        // even if that store was its last use, until our caller replaces it.
-        phi.keep();
-        phi.setDef(2,mem);
-        phi.unkeep();
-        return sink;
-    }
-
-    // Check that "mem" has no uses except "this"
-    private boolean checkOnlyUse(Node mem) {
-        if( mem.nOuts()==1 ) return true;
-        // Add deps on the other uses (can be e.g. ScopeNode mid-parse) so that
-        // when the other uses go away we can retry.
-        for( Node use : mem._outputs )
-            if( use != this )
-                addDep(use);
-        return false;
-    }
-
-    @Override
-    public Parser.ParseException err() {
-        Parser.ParseException err = super.err();
-        if( err != null ) return err;
-        assert _size>0 || CodeGen.CODE._phase.ordinal() <= CodeGen.Phase.FinalizeIR.ordinal();
-        if( ptr()._type == Type.TOP ) // Dead store?
-            return null;
-        TypeMemPtr tmp = (TypeMemPtr)ptr()._type;
-        Field f = tmp._obj.field(_name);
-        if( f!=null && (tmp._ro || f._final) && !_init )
-            return Parser.error("Cannot modify final field '"+_name+"'",_loc);
-        return null;
-    }
-
-    // Do not GVN Stores. Two equal Stores on two of three paths are the easy
-    // failure: sharing them makes GCM place the Store on all three paths.
-    // Sharing is safe only if every exit path goes through an original Store,
-    // or GCM splits the shared Store to keep it on those paths. Stores must
-    // sink, not run on extra paths. GVN does not check this; GCM does not split.
-    // Identity also disables generic Phi factoring of Stores.
-    // The closed-loop Store sink is a separate peep and still applies.
-    @Override public boolean eq(Node n) { return this == n; }
-    @Override int hash() { return super.hash() ^ _size; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/SubNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/SubNode.java
deleted file mode 100644
index adad2ed5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/SubNode.java
+++ /dev/null
@@ -1,56 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-import java.util.BitSet;
-
-public class SubNode extends ArithNode {
-    @Override boolean allowFloat() { return true; }
-    public SubNode(Node lhs, Node rhs) { super(null, lhs, rhs); }
-    public SubNode(Node lhs, Node rhs, byte mode) { super(null, lhs, rhs,mode); }
-
-
-    @Override public String op() { return "-"; }
-
-    @Override long   doOp( long  x,  long  y ) { return x - y; }
-    @Override double doOp(double x, double y ) { return x - y; }
-    @Override TypeInteger doOp(TypeInteger x, TypeInteger y) {
-        // Sub of same is 0
-        if( in(1)==in(2) )
-            return TypeInteger.ZERO;
-        // Fold ranges like {2-3} - {0-1} into {1-3}.
-        if( !AddNode.overflow(x._min,-y._max) &&
-            !AddNode.overflow(x._max,-y._min) &&
-            y._min != Long.MIN_VALUE  )
-            return TypeInteger.make(x._min-y._max,x._max-y._min);
-
-        return TypeInteger.BOT;
-    }
-
-    @Override
-    public Node idealize() {
-        Node lhs = in(1);
-        Node rhs = in(2);
-        Type t1 = lhs._type;
-        Type t2 = rhs._type;
-
-        // Keep invalid operands and unresolved numeric modes for type checking.
-        if( _mode==1 && t1 instanceof TypeInteger x && t2 instanceof TypeInteger y ) {
-            if( y.isConstant() && y.value()==0 ) return lhs;
-            if( x.isConstant() && x.value()==0 ) return new MinusNode(rhs);
-        }
-
-        // x - (-y) is x+y
-        if( rhs instanceof MinusNode minus )
-            return new AddNode(lhs,minus.in(1));
-
-        // (-x) - y is -(x+y)
-        if( lhs instanceof MinusNode minus )
-            return new MinusNode(new AddNode(minus.in(1),rhs).peephole());
-
-        return super.idealize();
-    }
-
-    @Override Node copy(Node lhs, Node rhs) { return new SubNode(lhs,rhs,_mode); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ToFloatNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ToFloatNode.java
deleted file mode 100644
index 1acf55b6..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ToFloatNode.java
+++ /dev/null
@@ -1,26 +0,0 @@
-package com.seaofnodes.simple.node;
-
-
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeFloat;
-import com.seaofnodes.simple.type.TypeInteger;
-
-
-public class ToFloatNode extends Node {
-    public ToFloatNode(Node lhs) { super(null, lhs); }
-
-
-    @Override protected String format() { return "(flt)%1"; }
-
-    @Override
-    public Type compute() {
-        if( in(1)._type.isHigh() ) return TypeFloat.F64.dual();
-        if( in(1)._type == Type.NIL ) return TypeFloat.FZERO;
-        if( in(1)._type instanceof TypeInteger i0 && i0.isConstant() )
-            return TypeFloat.constant(i0.value());
-        return TypeFloat.F64;
-    }
-
-    @Override public Node idealize() { return null; }
-    @Override Node copy(Node lhs, Node rhs) { return new ToFloatNode(lhs); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ToIntegerNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/ToIntegerNode.java
deleted file mode 100644
index 9136aacc..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/ToIntegerNode.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeFloat;
-import com.seaofnodes.simple.type.TypeInteger;
-
-// Truncate toward zero, saturating overflow; NaN converts to zero.
-public class ToIntegerNode extends Node {
-    public ToIntegerNode(Node lhs) { super(null,lhs); }
-
-    @Override public String label() { return "ToInteger"; }
-    @Override protected String format() { return "(int)%1"; }
-
-    @Override public Type compute() {
-        Type t = in(1)._type;
-        if( t.isHigh() ) return TypeInteger.TOP;
-        if( t instanceof TypeFloat tf && tf.isConstant() )
-            return TypeInteger.constant((long)tf.value());
-        return TypeInteger.BOT;
-    }
-
-    @Override public Node idealize() { return null; }
-    @Override Node copy(Node lhs, Node rhs) { return new ToIntegerNode(lhs); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/TypeNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/TypeNode.java
deleted file mode 100644
index 970472da..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/TypeNode.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-import java.util.BitSet;
-import java.util.HashMap;
-
-// Node carries an extra internal type
-public abstract class TypeNode extends Node {
-    public Type _con;
-    public TypeNode(Type t, Node... nodes) { super(nodes); assert t!=null; _con = t; }
-    public TypeNode(TypeNode tn) { super(tn); _con = tn._con; }
-    // Copy edges from ideal, but 'this' is a Type-Mach-Node (e.g. MemOpX86) and needs a _con
-    public TypeNode(Node ideal, Type con) { super(ideal); _con = con; }
-
-    // Upgrade the internal type
-    @Override boolean _upgradeType( HashMap<String,Type> TYPES) {
-        return liftType(_con.upgradeType(TYPES));
-    }
-
-    // Lift type
-    public boolean liftType( Type t ) {
-        if( t == _con ) return false;
-        unlock();               // Unlock before changing _con
-        _con = t;
-        return true;
-    }
-
-    @Override public boolean eq(Node n) { return _con==((TypeNode)n)._con; }
-    @Override int hash() { return _con.hashCode(); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/XCtrlNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/XCtrlNode.java
deleted file mode 100644
index 3792e224..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/XCtrlNode.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.Type;
-
-public class XCtrlNode extends CFGNode {
-    public XCtrlNode() { super(new Node[]{CodeGen.CODE._start}); }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) { return p.p("Xctrl"); }
-    @Override public boolean isConst() { return true; }
-    @Override  public Type compute() { return Type.XCONTROL; }
-    @Override public Node idealize() { return null; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/XorNode.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/XorNode.java
deleted file mode 100644
index e9cd13a5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/XorNode.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.seaofnodes.simple.node;
-
-import com.seaofnodes.simple.Parser;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-
-public class XorNode extends ArithNode {
-    public XorNode(Parser.Lexer loc, Node lhs, Node rhs) { super(loc, lhs, rhs, (byte)1); }
-
-
-    @Override public String op() { return "^"; }
-    @Override long doOp( long x, long y ) { return x ^ y; }
-    @Override TypeInteger doOp( TypeInteger x, TypeInteger y ) {
-        return TypeInteger.BOT;
-    }
-
-    @Override
-    public Node idealize() {
-        Node lhs = in(1);
-        Node rhs = in(2);
-
-        Type t1 = lhs._type;
-        Type t2 = rhs._type;
-
-        // Xor of 0.  We do not check for (0^x) because this will already
-        // canonicalize to (x^0)
-        if( t2.isConstant() && t2 instanceof TypeInteger i && i.value()==0 && forceInt(lhs) && lhs._type instanceof TypeInteger )
-            return lhs;
-
-        // Move constants to RHS: con*arg becomes arg*con
-        if ( t1.isConstant() && !t2.isConstant() )
-            return swap12();
-
-        // Do we have ((x ^ (phi cons)) ^ con) ?
-        // Do we have ((x ^ (phi cons)) ^ (phi cons)) ?
-        // Push constant up through the phi: x ^ (phi con0^con0 con1^con1...)
-        Node phicon = AddNode.phiCon(this,true);
-        if( phicon!=null ) return phicon;
-
-        return super.idealize();
-    }
-    @Override Node copy(Node lhs, Node rhs) { return new XorNode(_loc,lhs,rhs); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AddARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AddARM.java
deleted file mode 100644
index 76e47ca2..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AddARM.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class AddARM extends MachConcreteNode implements MachNode {
-    AddARM( Node add) { super(add); }
-    @Override public String op() { return "add"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-
-    // ADD (shifted register)
-    @Override public void encoding( Encoding enc ) { arm.r_reg(enc,this,Arm64.OP_ADD); }
-    // General form: "rd = rs1 + rs2"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" + ").p(code.reg(in(2)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AddFARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AddFARM.java
deleted file mode 100644
index 67a10b48..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AddFARM.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class AddFARM extends MachConcreteNode implements MachNode {
-    AddFARM(Node addf) { super(addf); }
-    @Override public String op() { return "addf"; }
-    @Override public RegMask regmap(int i) { return arm.DMASK; }
-    @Override public RegMask outregmap() { return arm.DMASK; }
-
-    //FADD (scalar)
-    @Override public void encoding( Encoding enc ) { arm.f_scalar(enc,this,Arm64.OPF_OP_ADD);}
-
-    // Default on double precision for now(64 bits)
-    // General form: "addf  rd = src1 + src2
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" + ").p(code.reg(in(2)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AddIARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AddIARM.java
deleted file mode 100644
index 4c635d07..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AddIARM.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-
-public class AddIARM extends MachConcreteNode implements MachNode {
-    final int _imm;
-    AddIARM(Node add, int imm) {
-        super(add);
-        _inputs.pop();
-        _imm = imm;
-    }
-    @Override public String op() {
-        return _imm == 1 ? "inc" : (_imm == -1 ? "dec" : "addi");
-    }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    //ADD (immediate)
-    @Override public void encoding( Encoding enc ) {
-        arm.imm_inst(enc,this, in(1), Arm64.OPI_ADD,_imm);
-    }
-    // General form: "addi  rd = rs1 + imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" + #").p(_imm);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AndARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AndARM.java
deleted file mode 100644
index 1a0365ad..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AndARM.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.MachConcreteNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.SB;
-
-public class AndARM extends MachConcreteNode implements MachNode {
-    AndARM(Node and) { super(and); }
-    @Override public String op() { return "and"; }
-    @Override public String glabel() { return "&"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    // AND (shifted register)
-    @Override public void encoding( Encoding enc ) { arm.r_reg(enc,this,Arm64.OP_AND); }
-    // General form:  #rd = rs1 & rs2
-    @Override public void asm(CodeGen code, SB sb){
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" & ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AndIARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AndIARM.java
deleted file mode 100644
index 6292e98e..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AndIARM.java
+++ /dev/null
@@ -1,25 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class AndIARM extends MachConcreteNode implements MachNode {
-    final int _imm;
-    AndIARM(Node and, int imm) {
-        super(and);
-        _inputs.pop();
-        _imm = imm;
-    }
-    @Override public String op() { return "andi"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        arm.imm_inst_n(enc,this, in(1), Arm64.OPI_AND,_imm);
-    }
-    // General form: "andi  rd = rs1 & imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" & #").p(Arm64.decodeImm12(_imm));
-    }
-}
\ No newline at end of file
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AsrARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AsrARM.java
deleted file mode 100644
index 77f14d4c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AsrARM.java
+++ /dev/null
@@ -1,19 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// Arithmetic Shift Right (register)
-public class AsrARM extends MachConcreteNode implements MachNode {
-    AsrARM(Node asr) {super(asr);}
-    @Override public String op() { return "sar"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.DMASK; }
-    @Override public void encoding( Encoding enc ) { arm.shift_reg(enc,this,Arm64.OP_ASR); }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" >> ").p(code.reg(in(2)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AsrIARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AsrIARM.java
deleted file mode 100644
index 7cb42eec..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/AsrIARM.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.MachConcreteNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.SB;
-
-public class AsrIARM extends MachConcreteNode implements MachNode {
-    final int _imm;
-    AsrIARM(Node asr, int imm) {
-        super(asr);
-        _inputs.pop();
-        _imm = imm;
-    }
-    @Override public String op() { return "asri"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        short rd = enc.reg(this);
-        short rn = enc.reg(in(1));
-        assert _imm > 0;
-        enc.add4(Arm64.imm_shift(Arm64.OPI_ASR,_imm, 0b111111, rn, rd));
-    }
-    // General form: "asri  rd = rs1 >> imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" >> #").p(_imm);
-    }
-}
\ No newline at end of file
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/BranchARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/BranchARM.java
deleted file mode 100644
index 31bbde86..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/BranchARM.java
+++ /dev/null
@@ -1,80 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Jump on flags, uses flags
-public class BranchARM extends IfNode implements MachNode, RIPRelSize {
-    String _bop;
-    final boolean _fp;
-    BranchARM(IfNode iff, String bop, boolean fp ) {
-        super(iff);
-        _bop = bop;
-        _fp = fp;
-    }
-    @Override public String op() { return "j"+_bop; }
-    @Override public String label() { return op(); }
-
-    @Override public void postSelect(CodeGen code) {
-        Node set = in(1);
-        if( set==null ) return; // Never-node cutout
-        Node cmp = set.in(1);
-        // Bypass an expected Set and just reference the cmp directly
-        if( set instanceof SetARM)
-            _inputs.set(1,cmp);
-        else
-            throw Utils.TODO();
-    }
-
-    @Override public RegMask regmap(int i) { assert i==1; return arm.FLAGS_MASK; }
-    @Override public RegMask outregmap() { return null; }
-    @Override public void negate() { _bop = negate(_bop);  }
-
-    @Override public void encoding( Encoding enc ) {
-        // Assuming that condition flags are already set.  These flags are set
-        // by comparison (or sub).  No need for regs because it uses flags
-        if( in(1)!=null ) {
-            // B.cond
-            enc.add4( Arm64.b_cond(Arm64.OP_BRANCH, 0, Arm64.make_condition(_bop, _fp)) );
-        } else {
-            if( _bop=="!=" ) return; // Inverted, no code
-            enc.add4(Arm64.b(Arm64.OP_UJMP, 0));
-        }
-        enc.jump(this,cproj(0));
-    }
-
-    // Delta is from opcode start
-    @Override public byte encSize(int delta) {
-        if( in(1)==null && _bop=="!=" ) return 0; // Inverted never-node, no code
-        if( -(1<<19) <= delta && delta < (1<<19) ) return 4;
-        // 2 word encoding needs a tmp register, must teach RA
-        throw Utils.TODO();
-    }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        assert !( in(1)==null && _bop=="!=" ); // Inverted never-node, no code no patch
-        if( opLen==4 ) {
-            enc.patch4(opStart,Arm64.b_cond(Arm64.OP_BRANCH, delta, Arm64.make_condition(_bop, _fp)));
-        } else {
-            throw Utils.TODO();
-        }
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        if( in(1)!=null ) {     // Never-node
-            String src = code.reg(in(1));
-            if( src!="flags" ) sb.p(src).p(" ");
-        } else if( _bop=="!=" ) {
-            sb.p("never");
-            return;
-        }
-        CFGNode prj = cproj(0).uctrlSkipEmpty();
-        if( !prj.blockHead() ) prj = prj.cfg0();
-        sb.p(label(prj));
-    }
-    @Override public String comment() { return "L"+cproj(1)._nid; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CallARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CallARM.java
deleted file mode 100644
index 4de28f3a..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CallARM.java
+++ /dev/null
@@ -1,50 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeFunPtr;
-import com.seaofnodes.simple.util.SB;
-
-public class CallARM extends CallNode implements MachNode, RIPRelSize {
-    final TypeFunPtr _tfp;
-    final String _name;
-    CallARM(CallNode call, TypeFunPtr tfp) {
-        super(call);
-        _inputs.pop(); // Pop constant target
-        assert tfp.isConstant();
-        _tfp = tfp;
-        _name = CodeGen.CODE.funcName(tfp.fidx());
-    }
-
-    @Override public String op() { return "call"; }
-    @Override public String label() { return op(); }
-    @Override public String name() { return _name; }
-    @Override public TypeFunPtr tfp() { return _tfp; }
-    @Override public RegMask regmap(int i) { return arm.callInMask(_tfp,i,fun()._maxArgSlot); }
-    @Override public RegMask outregmap() { return null; }
-    @Override public int nargs() { return nIns()-2; } // Minus control, memory, fptr
-
-    @Override public void encoding( Encoding enc ) {
-        FunNode fun = CodeGen.CODE.link(_tfp);
-        if( fun==null ) enc.external(this,_name);
-        else enc.relo(this);
-        // BL
-        enc.add4(Arm64.b(Arm64.OP_CALL,0)); // Target patched at link time
-    }
-
-    // Delta is from opcode start, but X86 measures from the end of the 5-byte encoding
-    @Override public byte encSize(int delta) { return 4; }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        enc.patch4(opStart,Arm64.b(Arm64.OP_CALL,delta));
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(_name).p("  ");
-        for( int i=0; i<nargs(); i++ )
-            sb.p(code.reg(arg(i+2))).p(", ");
-        sb.unchar(2);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CallRRARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CallRRARM.java
deleted file mode 100644
index 1949ae46..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CallRRARM.java
+++ /dev/null
@@ -1,33 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class CallRRARM extends CallNode implements MachNode {
-    CallRRARM(CallNode call) { super(call); }
-    @Override public String op() { return "callr"; }
-    @Override public String label() { return op(); }
-    @Override public RegMask regmap(int i) {
-        return i==_inputs._len
-            ? arm.RMASK                // Function call target
-            : arm.callInMask(tfp(),i,fun()._maxArgSlot); // Normal argument
-    }
-    @Override public RegMask outregmap() { return null; }
-
-    @Override public void encoding( Encoding enc ) {
-        // Needs a register, typically a jump-and-link-register opcode
-        // blr
-        short self = enc.reg(this);
-        enc.add4(Arm64.blr(Arm64.OP_CALLRARM, self));
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(fptr())).p("  ");
-        for( int i=0; i<nargs(); i++ )
-            sb.p(code.reg(arg(i))).p(", ");
-        sb.unchar(2);
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CmpARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CmpARM.java
deleted file mode 100644
index 1bd9c372..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CmpARM.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class CmpARM extends MachConcreteNode implements MachNode {
-    CmpARM( Node cmp ) { super(cmp); }
-    @Override public String op() { return "cmp"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.FLAGS_MASK; }
-
-    // SUBS (shifted register)
-    @Override public void encoding( Encoding enc ) { arm.r_reg_subs(enc,this,Arm64.OP_CMP); }
-
-    // General form: "cmp  rs1, rs2"
-    @Override public void asm(CodeGen code, SB sb) {
-        String dst = code.reg(this);
-        if( dst!="flags" )  sb.p(dst).p(" = ");
-        sb.p(code.reg(in(1))).p(", ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CmpFARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CmpFARM.java
deleted file mode 100644
index 67ffc27b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CmpFARM.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// compare instruction on float regs input(D-registers)
-public class CmpFARM extends MachConcreteNode implements MachNode{
-    CmpFARM(Node cmp) {super(cmp);}
-    @Override public String op() { return "cmpf"; }
-    @Override public RegMask regmap(int i) { return arm.DMASK; }
-    @Override public RegMask outregmap() { return arm.FLAGS_MASK; }
-
-    // FCMP
-    @Override public void encoding( Encoding enc ) { arm.f_cmp(enc,this); }
-    // General form: "cmp  d0, d1"
-    @Override public void asm(CodeGen code, SB sb) {
-        String dst = code.reg(this);
-        if( dst!="flags" )  sb.p(dst).p(" = ");
-        sb.p(code.reg(in(1))).p(", ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CmpIARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CmpIARM.java
deleted file mode 100644
index cd4dd9cf..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/CmpIARM.java
+++ /dev/null
@@ -1,41 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// Compare with immediate.
-// CMP (immediate) - SUBS
-public class CmpIARM extends MachConcreteNode implements MachNode {
-    final int _imm;
-    final String _bop;
-    CmpIARM(BoolNode bool, int imm) {
-        super(bool);
-        _inputs.pop();
-        _bop = bool.op();
-        _imm = imm;
-    }
-    CmpIARM( CmpIARM cmp ) {
-        super((Node)null);
-        addDef(null);
-        addDef(cmp.in(1));
-        _bop = cmp._bop;
-        _imm = cmp._imm;
-    }
-    @Override public String op() { return _imm==0 ? "test" : "cmp"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.FLAGS_MASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public Node copy() { return new CmpIARM(this); }
-
-    @Override public void encoding( Encoding enc ) { arm.imm_inst_subs(enc,in(1),in(1), Arm64.OPI_CMP,_imm); }
-
-    // General form: "cmp  rs1, 1"
-    @Override public void asm(CodeGen code, SB sb) {
-        String dst = code.reg(this);
-        if( dst!="flags" )  sb.p(dst).p(" = ");
-        sb.p(code.reg(in(1)));
-        if( _imm != 0 ) sb.p(", #").p(_imm);
-    }
- }
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/DivARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/DivARM.java
deleted file mode 100644
index e94b6491..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/DivARM.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class DivARM extends MachConcreteNode implements MachNode {
-    DivARM( Node div ) { super(div); }
-    @Override public String op() { return "div"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    // SDIV
-    @Override public void encoding( Encoding enc ) { arm.madd(enc,this,Arm64.OP_DIV,3); }
-    // General form: "div  dst /= src"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" / ").p(code.reg(in(2)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/DivFARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/DivFARM.java
deleted file mode 100644
index 68ad6047..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/DivFARM.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class DivFARM extends MachConcreteNode implements MachNode {
-    DivFARM( Node divf) { super(divf); }
-    @Override public String op() { return "divf"; }
-    @Override public RegMask regmap(int i) { return arm.DMASK; }
-    @Override public RegMask outregmap() {  return arm.DMASK; }
-
-    // FDIV (scalar)
-    @Override public void encoding( Encoding enc ) { arm.f_scalar(enc,this,Arm64.OPF_DIV); }
-    // General form: "VDIF =  dst /= src"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" / ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/ExtendARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/ExtendARM.java
deleted file mode 100644
index 814a82c2..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/ExtendARM.java
+++ /dev/null
@@ -1,31 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-
-// Convert a narrow C return register to Simple's full-width integer value.
-public class ExtendARM extends MachConcreteNode {
-    final int _bits;
-    final boolean _signed;
-    ExtendARM(ProjNode prj, TypeInteger ret) {
-        super(prj);
-        _inputs.set(0,null);
-        _inputs.add(new ProjARM(prj));
-        _bits = 8 << ret.log_size();
-        _signed = ret._min < 0;
-    }
-    @Override public String op() { return (_signed ? "sext" : "zext")+_bits; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public void encoding(Encoding enc) {
-        short dst = enc.reg(this), src = enc.reg(in(1));
-        // SBFM/UBFM aliases: sign/zero extend the low byte, short or int.
-        enc.add4(Arm64.imm_shift(_signed ? Arm64.OPI_ASR : Arm64.OPI_LSR,0,_bits-1,src,dst));
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/F8ToIARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/F8ToIARM.java
deleted file mode 100644
index 31dcfc36..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/F8ToIARM.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class F8ToIARM extends MachConcreteNode implements MachNode {
-    F8ToIARM(Node f8toi) { super(f8toi); }
-    @Override public String op() { return "cvti"; }
-    @Override public RegMask regmap(int i) { return arm.DMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        enc.add4(Arm64.floatToInteger(enc.reg(in(1))-arm.D_OFFSET,enc.reg(this)));
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p("(int)").p(code.reg(in(1)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/FltARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/FltARM.java
deleted file mode 100644
index db2540f7..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/FltARM.java
+++ /dev/null
@@ -1,45 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.ConstantNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-//FMOV (scalar, immediate)
-//Floating-point move immediate.
-public class FltARM extends ConstantNode implements MachNode, RIPRelSize {
-    final String _ext;
-    FltARM( ConstantNode con, String ext ) { super(con); _ext = ext; }
-    @Override public String op() { return "ld8"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return arm.DMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public FltARM copy() { return new FltARM(this,_ext); }
-
-    @Override public void encoding( Encoding enc ) {
-        if( _ext!=null ) throw Utils.TODO();
-        enc.largeConstant(this,_con,0,-1/*TODO: ARM-style ELF patching*/);
-        short dst = (short)(enc.reg(this) - arm.D_OFFSET);
-        enc.add4(Arm64.load_pc(Arm64.OPF_ARM, 0, dst));
-    }
-
-    // Delta is from opcode start.
-    @Override public byte encSize(int delta) { return 4;  }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        short dst = (short)(enc.reg(this) - arm.D_OFFSET);
-        enc.patch4(opStart, Arm64.load_pc(Arm64.OPF_ARM, delta, dst));
-    }
-
-    // Human-readable form appended to the SB.  Things like the encoding,
-    // indentation, leading address or block labels not printed here.
-    // Just something like "ld4\tR17=[R18+12] // Load array base".
-    // General form: "op\tdst=src+src"
-    @Override public void asm(CodeGen code, SB sb) {
-        _con.print(sb.p(code.reg(this)).p(" = #"));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/FunARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/FunARM.java
deleted file mode 100644
index 17cafcde..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/FunARM.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.FunNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class FunARM  extends FunNode implements MachNode {
-    FunARM(FunNode fun) { super(fun); }
-    @Override public void computeFrameAdjust(CodeGen code, int maxReg) {
-        super.computeFrameAdjust(code,maxReg);
-        _frameAdjust = (_frameAdjust+15) & -16; // Keep SP aligned, including leaf spills.
-    }
-    @Override public void encoding( Encoding enc ) {
-        int sz = _frameAdjust;
-        if( sz == 0 ) return;   // Skip if no frame adjust
-        if( sz >= 1L<<12 ) throw Utils.TODO();
-        enc.add4(Arm64.imm_inst(Arm64.OPI_SUB, sz, arm.RSP, arm.RSP));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/I2F8ARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/I2F8ARM.java
deleted file mode 100644
index b1c30afc..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/I2F8ARM.java
+++ /dev/null
@@ -1,26 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class I2F8ARM extends MachConcreteNode implements MachNode {
-    I2F8ARM(Node i2f8) { super(i2f8); }
-    @Override public String op() { return "cvt"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.DMASK; }
-    @Override public void encoding( Encoding enc ) {
-        // SCVTF
-        short self = (short)(enc.reg(this )-arm.D_OFFSET);
-        short reg1 = enc.reg(in(1));
-        int body = Arm64.float_cast(Arm64.OP_FLOAT_C, 1, reg1, self);
-        enc.add4(body);
-    }
-
-    // General form: "i2f8 (flt)int_value"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p("(flt)").p(code.reg(in(1)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/IntARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/IntARM.java
deleted file mode 100644
index 72b76edd..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/IntARM.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.ConstantNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Integer constants
-public class IntARM extends ConstantNode implements MachNode {
-    final String _ext;
-    IntARM( ConstantNode con, String ext ) { super(con); _ext = ext; }
-
-    @Override public String op() { return "ldi"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-
-    @Override public boolean isClone() { return true; }
-    @Override public IntARM copy() { return new IntARM(this,_ext); }
-
-    @Override public void encoding( Encoding enc ) {
-        if( _ext!=null ) throw Utils.TODO();
-        short self = enc.reg(this);
-        long x = _con==Type.NIL ? 0 : ((TypeInteger)_con).value();
-        Arm64.constant(enc,self,x);
-    }
-
-    // Human-readable form appended to the SB.  Things like the encoding,
-    // indentation, leading address or block labels not printed here.
-    // Just something like "ld4\tR17=[R18+12] // Load array base".
-    // General form: "op\tdst=src+src"
-    @Override public void asm(CodeGen code, SB sb) {
-        String reg = code.reg(this);
-        _con.print(sb.p(reg).p(" = #"));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LoadARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LoadARM.java
deleted file mode 100644
index 53494092..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LoadARM.java
+++ /dev/null
@@ -1,34 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.LoadNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.SB;
-
-// Load memory addressing on ARM
-// Support imm, reg(direct), or reg+off(indirect) addressing
-// Base = base - base pointer, offset is added to base
-// idx  = null
-// off  = off - offset added to base
-
-public class LoadARM extends MemOpARM {
-    LoadARM(LoadNode ld, Node base, Node idx, int off) {
-        super(ld, base, idx, off, 0);
-    }
-    @Override public String op() { return "ld"+_sz; }
-    @Override public RegMask outregmap() { return size() >= 4 ? arm.MEM_MASK : arm.WMASK; }
-
-    private static final int[] OP_LOADS  = new int[]{ Arm64.OP_LOAD_IMM_8,  Arm64.OP_LOAD_IMM_16,  Arm64.OP_LOAD_IMM_32,  Arm64.OP_LOAD_IMM_64, };
-
-    private static final int[] OP_LOAD_RS  = new int[]{ Arm64.OP_LOAD_R_8 , Arm64.OP_LOAD_R_16 , Arm64.OP_LOAD_R_32 , Arm64.OP_LOAD_R_64,  };
-
-    // ldr(immediate - unsigned offset) | ldr(register)
-    @Override public void encoding( Encoding enc ) {
-        ldst_encode(enc, OP_LOADS[Integer.numberOfTrailingZeros(size())], OP_LOAD_RS[_con.log_size()], this, size());
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(",");
-        asm_address(code,sb);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LslARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LslARM.java
deleted file mode 100644
index 954cfac2..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LslARM.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// Logical Shift Left (register)
-public class LslARM extends MachConcreteNode implements MachNode {
-    LslARM(Node asr) {super(asr);}
-    @Override public String op() { return "shr"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-
-    @Override public void encoding( Encoding enc ) { arm.shift_reg(enc,this,Arm64.OP_LSL); }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" << ").p(code.reg(in(2)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LslIARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LslIARM.java
deleted file mode 100644
index b32153ab..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LslIARM.java
+++ /dev/null
@@ -1,34 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.MachConcreteNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.SB;
-
-public class LslIARM extends MachConcreteNode implements MachNode {
-    final int _imm;
-    LslIARM(Node lsl, int imm) {
-        super(lsl);
-        _inputs.pop();
-        _imm = imm;
-    }
-    @Override public String op() { return "lsli"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        short rd = enc.reg(this);
-        short rn = enc.reg(in(1));
-        assert _imm > 0;
-        // UBFM <Xd>, <Xn>, #(-<shift> MOD 64), #(63-<shift>)
-        // immr must be (-<shift> MOD 64) = 64 - shift
-        enc.add4(Arm64.imm_shift(Arm64.OPI_LSL, 64 - _imm, (64 - _imm) - 1, rn, rd));
-    }
-    // General form: "lsli  rd = rs1 << imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" << #").p(_imm);
-    }
-}
\ No newline at end of file
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LsrARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LsrARM.java
deleted file mode 100644
index 91be34e3..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LsrARM.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// Logical Shift Right (register)
-public class LsrARM extends MachConcreteNode implements MachNode {
-    LsrARM(Node asr) {super(asr);}
-    @Override public String op() { return "shr"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-
-    @Override public void encoding( Encoding enc ) { arm.shift_reg(enc,this,Arm64.OP_LSR); }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" >>> ").p(code.reg(in(2)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LsrIARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LsrIARM.java
deleted file mode 100644
index 243ce968..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/LsrIARM.java
+++ /dev/null
@@ -1,29 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// logical right shift immediate
-public class LsrIARM extends MachConcreteNode implements MachNode {
-    final int _imm;
-    LsrIARM(Node lsr, int imm) {
-        super(lsr);
-        _inputs.pop();
-        _imm = imm;
-    }
-    @Override public String op() { return "lsri"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        short rd = enc.reg(this);
-        short rn = enc.reg(in(1));
-        assert _imm > 0;
-        enc.add4(Arm64.imm_shift(Arm64.OPI_LSR,_imm, 0b111111, rn,rd));
-    }
-    // General form: "lsri  rd = rs1 >>> imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" >>> #").p(_imm);
-    }
-}
\ No newline at end of file
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/MemOpARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/MemOpARM.java
deleted file mode 100644
index 14eaf510..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/MemOpARM.java
+++ /dev/null
@@ -1,81 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.SB;
-import java.lang.StringBuilder;
-
-public abstract class MemOpARM extends MemOpNode implements MachNode {
-    final int _off;             // Limit 9 bits sized, or (13 bits<<logsize) unsigned
-    final int _imm;             // Limit ? bits
-    final int _bytes;
-    final char _sz;
-    MemOpARM(MemOpNode mop, Node ptr, Node idx, int off, int imm) {
-        super(mop,mop);
-        assert ptr._type instanceof TypeMemPtr && !(ptr instanceof AddNode);
-        assert ptr() == ptr;
-        _inputs.setX(2, ptr);
-        _inputs.setX(3, idx);
-        _off = off;
-        _imm = imm;
-        _bytes = mop instanceof StoreNode st ? st.storeSize() : 1<<_con.log_size();
-        _sz = (char)('0'+_bytes);
-    }
-
-    // Store-based flavors have a value edge
-    MemOpARM( MemOpNode mop, Node ptr, Node idx, int off, int imm, Node val ) {
-        this(mop,ptr,idx,off,imm);
-        _inputs.setX(4,val);
-    }
-
-    @Override public String label() { return op();}
-    Node val() { return in(4); } // Only for stores
-
-    @Override protected ExprPrinter<Node> _printMach(ExprPrinter<Node> p) { return p.p(".").p(_name); }
-
-    @Override public Type compute() { throw new AssertionError("Do not call compute on "+getClass().getSimpleName()); }
-    @Override public Node idealize() { throw new AssertionError("Do not call idealize on "+getClass().getSimpleName()); }
-
-    int size() { return _bytes; }
-
-    // Wider mask to store both GPRs and FPRs
-    @Override public RegMask regmap(int i) {
-        // 0 - ctrl
-        if( i==1 ) return null; // memory
-        if( i==2 ) return arm.RMASK; // ptr/base
-        if( i==3 ) return arm.RMASK; // off/index
-        if( i==4 ) return size() >= 4 ? arm.MEM_MASK : arm.RMASK; // value
-        return null; // Anti-dependence
-    }
-
-    // Shared encoding for loads and stores(int and float)
-    public void ldst_encode( Encoding enc, int opcode_imm, int opcode_reg, Node xval, int size) {
-        short ptr = enc.reg(ptr());
-        short off = enc.reg(off());
-        short val = enc.reg(xval);
-        // The allocated register selects integer vs SIMD/FP encoding, even for
-        // bitwise copies. ARM numbers each register bank from zero in the opcode.
-        boolean fp = val >= arm.D0;
-        assert !fp || size >= 4;
-        if( fp ) {
-            opcode_imm |= 1<<4;
-            opcode_reg |= 1<<5;
-            val -= arm.D0;
-        }
-        int body = off() == null
-            ? Arm64.load_str_imm(opcode_imm, _off, ptr, val, size)
-            : Arm64.indr_adr(opcode_reg, off, Arm64.STORE_LOAD_OPTION.SXTX, 0, ptr, val);
-        enc.add4(body);
-    }
-
-    SB asm_address(CodeGen code, SB sb) {
-        sb.p("[").p(code.reg(ptr())).p("+");
-        if( off() != null ) sb.p(code.reg(off()));
-        else sb.p(_off);
-        return sb.p("]");
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/MulARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/MulARM.java
deleted file mode 100644
index f598cefb..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/MulARM.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// mulh signed multiply instruction(no-imm form)
-public class MulARM extends MachConcreteNode implements MachNode {
-    MulARM(Node mul) {super(mul);}
-    @Override public String op() { return "mul"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-
-    @Override public void encoding( Encoding enc ) { arm.madd(enc,this,Arm64.OP_MUL,31); }
-    // General form: "rd = rs1 * rs2"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" * ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/MulFARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/MulFARM.java
deleted file mode 100644
index a4f81fd4..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/MulFARM.java
+++ /dev/null
@@ -1,19 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class MulFARM extends MachConcreteNode implements MachNode{
-    MulFARM(Node mulf) {super(mulf);}
-    @Override public String op() { return "mulf"; }
-    @Override public RegMask regmap(int i) { return arm.DMASK; }
-    @Override public RegMask outregmap() { return arm.DMASK; }
-    @Override public void encoding( Encoding enc ) { arm.f_scalar(enc,this,Arm64.OPF_MUL); }
-    // Default on double precision for now(64 bits)
-    // General form: "VMUL.f32  rd = src1 * src2
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" * ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/NegARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/NegARM.java
deleted file mode 100644
index 881b41f9..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/NegARM.java
+++ /dev/null
@@ -1,25 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.node.MachConcreteNode;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-
-public class NegARM extends MachConcreteNode implements MachNode {
-    NegARM(Node sub) {
-        super(sub);
-        //_inputs.pop();
-    }
-    @Override public String op() { return "neg"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap()   { return arm.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        // reverse subtract with immediate 0
-        arm.imm_inst(enc,this, in(1), 0b00100110, 0);
-    }
-    // General form: "subi  rd = rs1 - imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = -").p(code.reg(in(1)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/NewARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/NewARM.java
deleted file mode 100644
index 8bb8983e..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/NewARM.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class NewARM extends NewNode implements MachNode, RIPRelSize {
-    // A pre-zeroed chunk of memory.
-    NewARM(NewNode nnn) { super(nnn); }
-    @Override public void encoding( Encoding enc ) {
-        // BL(branch with link)
-        enc.external(this,"calloc").
-            add4(Arm64.mov(Arm64.OP_MOVZ, 0, 1, 0)).   // movz x0,#1
-            add4(Arm64.b(Arm64.OP_CALL, 0));
-    }
-
-    // Patch is for running "new" in a JIT.
-    // Delta is from opcode start
-    @Override public byte encSize(int delta) { return 4*2; }
-
-    // Patch is for running "new" in a JIT.
-    // Delta is from opcode start
-    @Override public void patch(Encoding enc, int opStart, int opLen, int delta ) {
-        // Negative patches are JIT emulator targets.
-        if( opStart+delta < 0 ) {
-            enc.patch4(opStart+4, Arm64.b_calloc(Arm64.OP_CALL, delta-4));
-        } else {
-            throw Utils.TODO();
-        }
-    }
-    // General form: "alloc #bytes  PC"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p("\n");             // Multi-op trigger
-        sb.p("ldi   ").p(code._mach.regs()[_arg2Reg]).p(" = #1\n");
-        sb.p("call  #calloc");
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/NotARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/NotARM.java
deleted file mode 100644
index f8e450f6..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/NotARM.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.node.MachConcreteNode;
-import com.seaofnodes.simple.util.SB;
-
-public class NotARM extends MachConcreteNode implements MachNode{
-    NotARM(NotNode not) {super(not);}
-    @Override public String op() { return "not"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK;  }
-    @Override public RegMask killmap() { return arm.FLAGS_MASK; }
-    @Override public void encoding( Encoding enc ) {
-        // subs xzr, rs, #0
-        // cset    rd, eq        // Set rd to 1 if rs == 0 (equal), else 0
-        // subtracting zero from rs will just yield rs, it sets the zero flag and then it's used in cset
-        short self = enc.reg(this );
-        short reg1 = enc.reg(in(1));
-        int subs = Arm64.imm_inst(Arm64.OP_SUBS, 0, reg1, 31);
-        enc.add4(subs);
-        int cset = Arm64.cset(Arm64.OP_CSET, 31, Arm64.COND.EQ, 31, self);
-        enc.add4(cset);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) { sb.p(code.reg(this)); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/OrARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/OrARM.java
deleted file mode 100644
index 5b7264ec..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/OrARM.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// Not using the ORRS variant.
-public class OrARM extends MachConcreteNode implements MachNode {
-    OrARM(Node and) { super(and); }
-    @Override public String op() { return "or"; }
-    @Override public String glabel() { return "|"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public void encoding( Encoding enc ) { arm.r_reg(enc,this,Arm64.OP_OR); }
-    // General form:  #rd = rs1 & rs2
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" | ").p(code.reg(in(2)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/OrIARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/OrIARM.java
deleted file mode 100644
index 86d07bee..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/OrIARM.java
+++ /dev/null
@@ -1,25 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class OrIARM extends MachConcreteNode implements MachNode {
-    final int _imm;
-    OrIARM(Node or, int imm) {
-        super(or);
-        _inputs.pop();
-        _imm = imm;
-    }
-    @Override public String op() { return "ori"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        arm.imm_inst_n(enc, this, in(1), Arm64.OPI_OR, _imm);
-    }
-    // General form: "ori  rd = rs1 | imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" | #").p(_imm);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/ParmARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/ParmARM.java
deleted file mode 100644
index b419fe0a..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/ParmARM.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.ParmNode;
-
-public class ParmARM extends ParmNode implements MachNode {
-    final RegMask _rmask;
-    ParmARM(ParmNode parm) {
-        super(parm);
-        _rmask = arm.callInMask(fun().sig(),_idx,0);
-    }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return _rmask; }
-    @Override public void encoding( Encoding enc ) { }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/ProjARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/ProjARM.java
deleted file mode 100644
index 4b7d6f13..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/ProjARM.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.ProjNode;
-
-public class ProjARM extends ProjNode implements MachNode {
-    ProjARM( ProjNode p ) { super(p); }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() {
-        return ((MachNode)in(0)).outregmap(_idx);
-    }
-    @Override public void encoding( Encoding enc ) { }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/RetARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/RetARM.java
deleted file mode 100644
index a7ed5073..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/RetARM.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.*;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-
-public class RetARM extends ReturnNode implements MachNode {
-    RetARM(ReturnNode ret, FunNode fun) { super(ret, fun); fun.setRet(this); }
-    @Override public void encoding( Encoding enc ) {
-        int frameAdjust = ((FunARM)fun())._frameAdjust;
-        if( frameAdjust > 0 )
-            enc.add4(Arm64.imm_inst(Arm64.OPI_ADD, frameAdjust, arm.RSP, arm.RSP));
-        enc.add4(Arm64.ret(Arm64.OP_RET));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SetARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SetARM.java
deleted file mode 100644
index e5b06c39..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SetARM.java
+++ /dev/null
@@ -1,36 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// conditional set?
-// e.g CSET, stores flag info into GPRS after compare
-public class SetARM extends MachConcreteNode implements MachNode {
-    final String _bop;          // One of <,<=,==
-    final boolean _fp;          // FP compare (unsigned encoding)
-    SetARM(Node cmp, String bop, boolean fp) {
-        super(cmp);
-        _inputs.setLen(1);   // Pop the cmp inputs
-        // Replace with the matched cmp
-        _inputs.push(cmp);
-        _bop = bop;
-        _fp = fp;
-    }
-    @Override public String op() { return "set"+_bop; }
-    @Override public RegMask regmap(int i) { assert i==1; return arm.FLAGS_MASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        // Using RM==RN==31 implies a *zero* value, not R31.
-        int body = Arm64.cset(Arm64.OP_CSET,0b11111, Arm64.make_condition(_bop, _fp), 0b011111, enc.reg(this));
-        enc.add4(body);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this));
-        String src = code.reg(in(1));
-        if( src!="flags" )  sb.p(" = ").p(src);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SplitARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SplitARM.java
deleted file mode 100644
index dcfeb5d8..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SplitARM.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.FunNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.node.SplitNode;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class SplitARM extends SplitNode {
-    SplitARM(LRG lrg, String kind, byte round) { super(lrg,kind,round,new Node[2]);}
-    @Override public RegMask regmap(int i) { return arm.SPLIT_MASK; }
-    @Override public RegMask outregmap() { return arm.SPLIT_MASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        short dst = enc.reg(this );
-        short src = enc.reg(in(1));
-
-        boolean dstX = dst >= arm.D_OFFSET;
-        boolean srcX = src >= arm.D_OFFSET;
-
-        if (dst >= arm.MAX_REG) {
-            // store to sp
-            if(src >= arm.MAX_REG) {
-                throw Utils.TODO();
-            }
-            int off = fun(enc).computeStackOffset(enc._code,dst);
-            if( srcX ) src -= arm.D_OFFSET;
-            enc.add4(Arm64.load_str_imm(Arm64.OP_STORE_IMM_64, off, arm.RSP, src, 8));
-            return;
-        }
-
-        if(src >= arm.MAX_REG) {
-            // Load from SP
-            int off = fun(enc).computeStackOffset(enc._code,src);
-            if( dstX ) dst -= arm.D_OFFSET;
-            enc.add4(Arm64.load_str_imm(Arm64.OP_LOAD_IMM_64, off, arm.RSP, dst, 8));
-            return;
-        }
-
-        // pick opcode based on regs
-        if(!dstX && !srcX) {
-            // GPR->GPR
-            enc.add4(Arm64.mov_reg(Arm64.OP_MOV, src, dst));
-        } else if(dstX && srcX) {
-            // FPR->FPR
-            // fmov reg
-            enc.add4(Arm64.f_mov_reg(Arm64.OP_FMOV_REG, src - arm.D_OFFSET,dst - arm.D_OFFSET));
-        } else if(!srcX && dstX) {
-            // GPR->FPR
-            // FMOV(general) 64 bits to DOUBLE-PRECISION
-            enc.add4(Arm64.f_mov_general(Arm64.OP_FMOV, 0b01, 0, 0b111, src, dst - arm.D_OFFSET));
-        } else if( srcX && !dstX) {
-            //FPF->GPR
-            // FMOV(general) DOUBLE-PRECISION to 64 bits
-            enc.add4(Arm64.f_mov_general(Arm64.OP_FMOV, 0b01, 0, 0b110, src - arm.D_OFFSET, dst));
-        }
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SplitFlagsARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SplitFlagsARM.java
deleted file mode 100644
index 25e5d501..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SplitFlagsARM.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-
-// NZCV transfers require a GPR. Further splits can spill that GPR to the stack.
-public class SplitFlagsARM extends SplitARM {
-    private static final RegMask MASK = new RegMask(arm.WR_BITS,1L);
-    SplitFlagsARM(LRG lrg,String kind,byte round) { super(lrg,kind,round); }
-    @Override public boolean isNonStackSplit() { return true; }
-    @Override public RegMask regmap(int i) { return MASK; }
-    @Override public RegMask outregmap() { return MASK; }
-
-    @Override public void encoding(Encoding enc) {
-        short dst=enc.reg(this), src=enc.reg(in(1));
-        if( dst==src ) return;
-        if( src==arm.FLAGS ) enc.add4(Arm64.flags(dst,false));
-        else if( dst==arm.FLAGS ) enc.add4(Arm64.flags(src,true));
-        else super.encoding(enc);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SplitGPRARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SplitGPRARM.java
deleted file mode 100644
index c9b2127a..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SplitGPRARM.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.simple.codegen.*;
-
-// Keep a saved NZCV value in GPRs and stack slots through subsequent spills.
-public class SplitGPRARM extends SplitARM {
-    private static final RegMask MASK = new RegMask(arm.WR_BITS,-2L);
-    SplitGPRARM(LRG lrg,String kind,byte round) { super(lrg,kind,round); }
-    @Override public RegMask regmap(int i) { return MASK; }
-    @Override public RegMask outregmap() { return MASK; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/StoreARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/StoreARM.java
deleted file mode 100644
index 0b90ac8b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/StoreARM.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.node.StoreNode;
-import com.seaofnodes.simple.util.SB;
-
-// Store memory addressing on ARM
-// Support imm, reg(direct), or reg+off(indirect) addressing
-// base - base pointer, offset is added to base
-// null - index never allowed (no [reg+reg] mode)
-// off  - offset added to base
-// imm  - immediate value to store, only if val is null
-// val  - value to store or null
-
-//e.g s.cs[0] =  67; // C
-// base = s.cs, off = 4, imm = 67, val = null
-public class StoreARM extends MemOpARM {
-    StoreARM(StoreNode st, Node base, Node idx, int off, Node val) {
-        super(st, base, idx, off, 0, val);
-    }
-    @Override public String op() { return "st"+_sz; }
-    @Override public RegMask outregmap() { return null; }
-
-    private static final int[] OP_STORES = new int[]{ Arm64.OP_STORE_IMM_8, Arm64.OP_STORE_IMM_16, Arm64.OP_STORE_IMM_32, Arm64.OP_STORE_IMM_64, };
-
-    private static final int[] OP_STORE_RS = new int[]{ Arm64.OP_STORE_R_8, Arm64.OP_STORE_R_16, Arm64.OP_STORE_R_32, Arm64.OP_STORE_R_64, };
-
-    @Override public void encoding( Encoding enc ) {
-        ldst_encode(enc, OP_STORES[Integer.numberOfTrailingZeros(size())], OP_STORE_RS[Integer.numberOfTrailingZeros(_bytes)], val(), size());
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        asm_address(code,sb).p(",");
-        if( val()==null ) sb.p("#").p(_imm);
-        else sb.p(code.reg(val()));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SubARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SubARM.java
deleted file mode 100644
index fd5cd4de..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SubARM.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class SubARM extends MachConcreteNode implements MachNode {
-    SubARM(Node sub) { super(sub); }
-    @Override public String op() { return "sub"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-
-    @Override public void encoding( Encoding enc ) { arm.r_reg(enc,this,Arm64.OP_SUB); }
-
-    // General form: "sub  # rd = rs1 - rs2"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" - ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SubFARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SubFARM.java
deleted file mode 100644
index 1a751434..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SubFARM.java
+++ /dev/null
@@ -1,19 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class SubFARM extends MachConcreteNode implements MachNode {
-    SubFARM(Node subf) {super(subf);}
-    @Override public String op() { return "subf"; }
-    @Override public RegMask regmap(int i) { return arm.DMASK; }
-    @Override public RegMask outregmap() { return arm.DMASK; }
-    @Override public void encoding( Encoding enc ) { arm.f_scalar(enc,this,Arm64.OPF_SUB); }
-    // Default on double precision for now(64 bits)
-    // General form: "vsub.f32  rd = src1 + src2
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" - ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SubIARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SubIARM.java
deleted file mode 100644
index b2c0b2ed..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/SubIARM.java
+++ /dev/null
@@ -1,29 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.node.MachConcreteNode;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-
-public class SubIARM extends MachConcreteNode implements MachNode {
-    final int _imm;
-    SubIARM(Node sub, int imm) {
-        super(sub);
-        _inputs.pop();
-        _imm = imm;
-    }
-    @Override public String op() { return _imm == -1 ? "dec" : "subi"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        arm.imm_inst(enc,this, in(1), Arm64.OPI_SUB,_imm);
-    }
-
-    // General form: "subi  rd = rs1 - imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" - #").p(_imm);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/TFPARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/TFPARM.java
deleted file mode 100644
index a053ba46..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/TFPARM.java
+++ /dev/null
@@ -1,51 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeFunPtr;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class TFPARM extends FunPtrNode implements MachNode, RIPRelSize {
-    final String _ext;
-    // Pointer to a Simple function
-    TFPARM( FunPtrNode fptr ) { super(fptr); _ext = null; }
-    // Pointer to an Extern "C" function
-    TFPARM( TypeFunPtr fptr, String ext ) { super(fptr,CodeGen.CODE._start,null); _type = fptr; _ext = ext; }
-    @Override public String op() { return "ldx"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public TFPARM copy() { return new TFPARM((TypeFunPtr)_con,_ext); }
-    @Override public void encoding( Encoding enc ) {
-        if( _ext==null ) enc.relo(this);          // Internal patch
-        else             enc.external(this,_ext); // ELF-file external patch
-        short dst = enc.reg(this);
-        // adrp    x0, 0
-        enc.add4(Arm64.adrp(1,0, Arm64.OP_ADRP, 0,dst));
-        // add     x0, x0, 0
-        arm.imm_inst(enc,Arm64.OPI_ADD,0, dst);
-    }
-
-    @Override public byte encSize(int delta) {
-        return 8;
-    }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        short rpc = enc.reg(this);
-        if(opLen == 8 ) {
-            arm.patch_adrp_add(enc, opStart, delta, rpc);
-        } else {
-            // should not happen as one instruction is 4 byte, and TFP arm encodes 2.
-            throw Utils.TODO();
-        }
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        String reg = code.reg(this);
-        _type.print(sb.p(reg).p(" #"));
-    }
-    @Override public boolean eq(Node n) { return this==n; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/TMPARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/TMPARM.java
deleted file mode 100644
index b2531f97..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/TMPARM.java
+++ /dev/null
@@ -1,49 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.ConstantNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.type.TypeMemPtr;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class TMPARM extends ConstantNode implements MachNode, RIPRelSize {
-    final String _ext;
-    TMPARM( ConstantNode con, String ext ) { super(con); _ext = ext; }
-    @Override public String op() { return "ldp"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public TMPARM copy() { return new TMPARM(this,_ext); }
-    @Override public void encoding( Encoding enc ) {
-        if( _ext!=null ) enc.externalData(this,_ext);
-        else enc.largeConstant(this,((TypeMemPtr)_con)._obj,0,-1);
-        short dst = enc.reg(this);
-        // adrp    x0, 0
-        enc.add4(Arm64.adrp(1,0, Arm64.OP_ADRP, 0,dst));
-        // add     x0, x0, 0
-        arm.imm_inst(enc,Arm64.OPI_ADD,0, dst);
-    }
-
-    @Override public byte encSize(int delta) {
-        return 8;
-    }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        short dst = enc.reg(this);
-        if(opLen == 8 ) {
-            arm.patch_adrp_add(enc, opStart, delta, dst);
-        } else {
-            throw Utils.TODO();
-        }
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        String reg = code.reg(this);
-        _con.print(sb.p(reg).p(" #"));
-    }
-    @Override public boolean eq(Node n) { return this==n; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/UJmpARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/UJmpARM.java
deleted file mode 100644
index aecd02bb..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/UJmpARM.java
+++ /dev/null
@@ -1,48 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// unconditional jump
-public class UJmpARM extends CFGNode implements MachNode, RIPRelSize {
-    UJmpARM() { }
-    @Override public String op() { return "jmp"; }
-    @Override public String label() { return op(); }
-    @Override protected String format() { return "jmp "; }
-    @Override public RegMask regmap(int i) {return null; }
-    @Override public RegMask outregmap() { return null; }
-    @Override public Type compute() { throw Utils.TODO(); }
-    @Override public Node idealize() { throw Utils.TODO(); }
-    @Override public void encoding( Encoding enc ) {
-        enc.jump(this,uctrl());
-        int body = Arm64.b(Arm64.OP_UJMP, 0);
-        enc.add4(body);
-    }
-
-    // Delta is from opcode start
-    @Override public byte encSize(int delta) {
-        if( -(1<<26) <= delta && delta < (1<<26) ) return 4;
-        // 2 word encoding needs a tmp register, must teach RA
-        throw Utils.TODO();
-    }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        if( opLen==4 ) {
-            enc.patch4(opStart,Arm64.b(Arm64.OP_UJMP, delta));
-        } else {
-            throw Utils.TODO();
-        }
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        CFGNode target = uctrl();
-        //assert target.nOuts() > 1; // Should optimize jmp to empty targets
-        sb.p(label(target));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/XorARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/XorARM.java
deleted file mode 100644
index d56397a3..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/XorARM.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class XorARM extends MachConcreteNode implements MachNode{
-    XorARM(Node xor) {super(xor);}
-    @Override public String op() { return "xor"; }
-    @Override public String glabel() { return "^"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-    @Override public void encoding( Encoding enc ) { arm.r_reg(enc,this,Arm64.OP_XOR); }
-    // General form: "rd = x1 ^ x2"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" ^ ").p(code.reg(in(2)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/XorIARM.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/XorIARM.java
deleted file mode 100644
index 12143ccd..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/XorIARM.java
+++ /dev/null
@@ -1,27 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.node.MachConcreteNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.util.SB;
-
-public class XorIARM extends MachConcreteNode implements MachNode {
-    final int _imm;
-    XorIARM(Node xor, int imm) {
-        super(xor);
-        _inputs.pop();
-        _imm = imm;
-    }
-
-    @Override public String op() { return "xori"; }
-    @Override public RegMask regmap(int i) { return arm.RMASK; }
-    @Override public RegMask outregmap() { return arm.WMASK; }
-
-    // General form: "xori  rd = rs1 ^ imm"
-    @Override public void encoding( Encoding enc ) { arm.imm_inst_n(enc,this, in(1), Arm64.OPI_XOR,_imm); }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" ^ #").p(_imm);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/arm.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/arm.java
deleted file mode 100644
index 3c965da5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/arm/arm.java
+++ /dev/null
@@ -1,503 +0,0 @@
-package com.seaofnodes.simple.node.cpus.arm;
-
-import com.seaofnodes.isa.Arm64;
-import static com.seaofnodes.isa.Arm64.*;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-
-public class arm extends Machine {
-    public arm( CodeGen code ) {
-        if( !"SystemV".equals(code._callingConv) )
-            throw new IllegalArgumentException("Unknown calling convention "+code._callingConv);
-    }
-
-    // ARM64
-    @Override public String name() { return "arm"; }
-
-    // GPR(S)
-    public static final int X0  =  0,  X1  =  1,  X2  =  2,  X3  =  3,  X4  =  4,  X5  =  5,  X6  =  6,  X7  =  7;
-    public static final int X8  =  8,  X9  =  9,  X10 = 10,  X11 = 11,  X12 = 12,  X13 = 13,  X14 = 14,  X15 = 15;
-    public static final int X16 = 16,  X17 = 17,  X18 = 18,  X19 = 19,  X20 = 20,  X21 = 21,  X22 = 22,  X23 = 23;
-    public static final int X24 = 24,  X25 = 25,  X26 = 26,  X27 = 27,  X28 = 28,  X29 = 29,  X30 = 30,  RSP = 31;
-
-    // Floating point registers
-    public static final int D0  = 32,  D1  = 33,  D2  = 34,  D3  = 35,  D4  = 36,  D5  = 37,  D6  = 38,  D7  = 39;
-    public static final int D8  = 40,  D9  = 41,  D10 = 42,  D11 = 43,  D12 = 44,  D13 = 45,  D14 = 46,  D15 = 47;
-    public static final int D16 = 48,  D17 = 49,  D18 = 50,  D19 = 51,  D20 = 52,  D21 = 53,  D22 = 54,  D23 = 55;
-    public static final int D24 = 56,  D25 = 57,  D26 = 58,  D27 = 59,  D28 = 60,  D29 = 61,  D30 = 62,  D31 = 63;
-
-    static final int FLAGS = 64;
-    static final int MAX_REG = 65;
-    public static final int D_OFFSET = 32;
-
-    static final String[] REGS = new String[] {
-        "X0",  "X1",  "X2",  "X3",  "X4",  "X5",  "X6",  "X7",
-        "X8",  "X9",  "X10", "X11", "X12", "X13", "X14", "X15",
-        "X16", "X17", "X18", "X19", "X20", "X21", "X22", "X23",
-        "X24", "X25", "X26", "X27", "X28", "X29", "RPC", "RSP",
-        "D0",  "D1",  "D2",  "D3",  "D4",  "D5",  "D6",  "D7",
-        "D8",  "D9",  "D10", "D11", "D12", "D13", "D14", "D15",
-        "D16", "D17", "D18", "D19", "D20", "D21", "D22", "D23",
-        "D24", "D25", "D26", "D27", "D28", "D29", "D30", "D31",
-        "flags"
-    };
-    @Override public String[] regs() { return REGS; }
-
-    // from (x0-x30)
-    // General purpose register mask: pointers and ints, not floats
-    static final long RD_BITS = 0xFFFFFFFFL;
-    static final RegMask RMASK = new RegMask(RD_BITS);
-    static final long WR_BITS = 0x7FFFFFFFL; // All the GPRs, not RSP
-    static final RegMask WMASK = new RegMask(WR_BITS);
-
-    // Float mask from(d0–d31)
-    static final long FP_BITS = 0xFFFFFFFFL<<D0;
-    static final RegMask DMASK = new RegMask(FP_BITS);
-
-    // Load/store mask; both GPR and FPR
-    static final RegMask MEM_MASK = new RegMask(WR_BITS | FP_BITS);
-
-    static final RegMask SPLIT_MASK = new RegMask(WR_BITS | FP_BITS, -2L/*skip flags*/);
-
-    static final RegMask FLAGS_MASK = new RegMask(FLAGS);
-
-    // Arguments masks
-    static final RegMask X0_MASK = new RegMask(X0);
-    static final RegMask X1_MASK = new RegMask(X1);
-    static final RegMask X2_MASK = new RegMask(X2);
-    static final RegMask X3_MASK = new RegMask(X3);
-    static final RegMask X4_MASK = new RegMask(X4);
-    static final RegMask X5_MASK = new RegMask(X5);
-    static final RegMask X6_MASK = new RegMask(X6);
-    static final RegMask X7_MASK = new RegMask(X7);
-
-    // Arguments(float) masks
-    static final RegMask D0_MASK = new RegMask(D0);
-    static final RegMask D1_MASK = new RegMask(D1);
-    static final RegMask D2_MASK = new RegMask(D2);
-    static final RegMask D3_MASK = new RegMask(D3);
-    static final RegMask D4_MASK = new RegMask(D4);
-    static final RegMask D5_MASK = new RegMask(D5);
-    static final RegMask D6_MASK = new RegMask(D6);
-    static final RegMask D7_MASK = new RegMask(D7);
-
-    // Calling convention; returns a machine-specific register
-    // for incoming argument idx.
-    // index 0 for control, 1 for memory, real args start at index 2
-    static final RegMask[] CALLINMASK = new RegMask[] {
-        X0_MASK,
-        X1_MASK,
-        X2_MASK,
-        X3_MASK,
-        X4_MASK,
-        X5_MASK,
-        X6_MASK,
-        X7_MASK,
-    };
-    static final RegMask[] XMMS = new RegMask[] {
-        D0_MASK,
-        D1_MASK,
-        D2_MASK,
-        D3_MASK,
-        D4_MASK,
-        D5_MASK,
-        D6_MASK,
-        D7_MASK,
-    };
-
-    // ARM ENCODING
-
-    // True if signed 9-bit immediate
-    private static boolean imm9(TypeInteger ti) {
-        // 55 = 64-9
-        return ti.isConstant() && ((ti.value()<<55)>>55) == ti.value();
-    }
-    // True if signed 12-bit immediate
-    private static boolean imm12(TypeInteger ti) {
-        // 52 = 64-12
-        return ti.isConstant() && ((ti.value()<<52)>>52) == ti.value();
-    }
-
-    // Can we encode this in ARM's 12-bit LOGICAL immediate form?
-    // Some combination of shifted bit-masks.
-    private static int imm12Logical(TypeInteger ti) {
-        return ti.isConstant() ? Arm64.logicalImmediate(ti.value()) : -1;
-    }
-
-    public static void imm_inst(Encoding enc, Node n,Node n2,  int opcode, int imm12) {
-        short self = enc.reg(n);
-        short reg1 = enc.reg(n2);
-
-        // ADD/SUB encode an unsigned magnitude; switch operation for a negative addend.
-        if( imm12<0 && (opcode==OPI_ADD || opcode==OPI_SUB) ) {
-            opcode ^= OPI_ADD ^ OPI_SUB;
-            imm12 = -imm12;
-        }
-        int body = Arm64.imm_inst(opcode, imm12&0xFFF, reg1, self);
-        enc.add4(body);
-    }
-
-    public static void imm_inst_subs(Encoding enc, Node n,Node n2,  int opcode, int imm12) {
-        short reg1 = enc.reg(n2);
-        // 31 = 11111
-        int body = Arm64.imm_inst(opcode, imm12&0xFFF, reg1, 31);
-        enc.add4(body);
-    }
-
-    // for cases where rs1 and dst are the same, eg add x0, x0, 1
-    public static void imm_inst(Encoding enc, int opcode, int imm12, int self) {
-        int body = Arm64.imm_inst(opcode, imm12&0xFFF, self, self);
-        enc.add4(body);
-    }
-
-    public static void imm_inst_n(Encoding enc, Node n, Node n2, int opcode, int imm13) {
-        short self = enc.reg(n);
-        short reg1 = enc.reg(n2);
-        int body = Arm64.imm_inst_n(opcode, imm13, reg1, self);
-        enc.add4(body);
-    }
-
-    // for cases where rs1 and dst are the same, eg add x0, x0, 1
-    public static int imm_inst_l(Encoding enc, Node n, int opcode, int imm12) {
-        short self = enc.reg(n);
-        short reg1 = enc.reg(n.in(1));
-        int body = Arm64.imm_inst(opcode, imm12&0xFFF, reg1, self);
-        return body;
-    }
-
-    // for normal add, reg1, reg2 cases (reg-to-reg)
-    // using shifted-reg form
-
-    public static void r_reg(Encoding enc, Node n, int opcode) {
-        short self = enc.reg(n);
-        short reg1 = enc.reg(n.in(1));
-        short reg2 = enc.reg(n.in(2));
-        int body = Arm64.r_reg(opcode, 0, reg2, 0,  reg1, self >= 32 ? reg1: self);
-        enc.add4(body);
-    }
-
-    public static void r_reg_subs(Encoding enc, Node n, int opcode) {
-        short reg1 = enc.reg(n.in(1));
-        short reg2 = enc.reg(n.in(2));
-        // 31 = 11111
-        int body = Arm64.r_reg(opcode, 0, reg2, 0,  reg1, 31);
-        enc.add4(body);
-    }
-
-    public static void shift_reg(Encoding enc, Node n, int op2) {
-        short self = enc.reg(n);
-        short reg1 = enc.reg(n.in(1));
-        short reg2 = enc.reg(n.in(2));
-        int body = Arm64.shift_reg(0b10011010110, reg2, op2, reg1, self);
-        enc.add4(body);
-    }
-
-    //  MUL can be considered an alias for MADD with the third operand Ra being set to 0
-
-    public static void madd(Encoding enc, Node n, int opcode, int ra) {
-        short self = enc.reg(n);
-        short reg1 = enc.reg(n.in(1));
-        short reg2 = enc.reg(n.in(2));
-        int body = Arm64.madd(opcode, reg2, ra,  reg1, self);
-        enc.add4(body);
-    }
-
-    public static void f_scalar(Encoding enc, Node n, int op ) {
-        short self = (short)(enc.reg(n)      -D_OFFSET);
-        short reg1 = (short)(enc.reg(n.in(1))-D_OFFSET);
-        short reg2 = (short)(enc.reg(n.in(2))-D_OFFSET);
-        int body = Arm64.f_scalar(0b00011110, 1, reg2, op,  reg1, self);
-        enc.add4(body);
-    }
-
-    public static void patch_adrp_add(Encoding enc, int opStart, int delta, int rd) {
-        int target = opStart + delta;
-        int pageDelta = ((target & ~0xFFF) - (opStart & ~0xFFF)) >> 12;
-        int imm21 = pageDelta & 0x1FFFFF;
-        enc.patch4(opStart  , Arm64.adrp(1, imm21 & 3, OP_ADRP, imm21 >>> 2, rd));
-        enc.patch4(opStart+4, Arm64.imm_inst_l(OPI_ADD, target & 0xFFF, rd));
-    }
-
-    public static void f_cmp(Encoding enc, Node n) {
-        short reg1 = (short)(enc.reg(n.in(1))-D_OFFSET);
-        short reg2 = (short)(enc.reg(n.in(2))-D_OFFSET);
-        int body = Arm64.f_cmp(0b00011110, 3, reg2,  reg1);
-        enc.add4(body);
-    }
-
-    @Override public RegMask callArgMask(TypeFunPtr tfp, int idx, int maxArgSlot ) { return callInMask(tfp,idx,maxArgSlot); }
-    static RegMask callInMask(TypeFunPtr tfp, int idx, int maxArgSlot ) {
-        if( idx==0 ) return CodeGen.CODE._rpcMask;
-        if( idx==1 ) return null;
-        // Count floats in signature up to index
-        if( idx-2 >= tfp.nargs() ) return null; // Anti-dependence
-        boolean hidden = hiddenSelf(tfp);
-        int sigidx = idx-2;
-        if( hidden ) {
-            if( sigidx==0 ) return null;
-            sigidx--;
-        }
-        // Count floats in signature up to index
-        int fcnt=0;
-        for( int i=hidden ? 1 : 0; i<idx-2; i++ )
-            if( tfp.arg(i) instanceof TypeFloat)
-                fcnt++;
-        // Floats up to XMMS in XMM registers
-        if( tfp.arg(idx-2) instanceof TypeFloat ) {
-            if( fcnt < XMMS.length )
-                return XMMS[fcnt];
-        } else {
-            RegMask[] cargs = CALLINMASK;
-            if( sigidx-fcnt < cargs.length )
-                return cargs[sigidx-fcnt];
-        }
-        // Pass on stack slot (8 and higher)
-        if( maxArgSlot>0 ) throw Utils.TODO();
-        return new RegMask(MAX_REG + 1 + sigidx);
-    }
-
-    // Return the max stack slot used by this signature, or 0
-    @Override public short maxArgSlot( TypeFunPtr tfp ) {
-        int icnt=0, fcnt=0;     // Count of ints, floats
-        for( int i=hiddenSelf(tfp) ? 1 : 0; i<tfp.nargs(); i++ ) {
-            if( tfp.arg(i) instanceof TypeFloat ) fcnt++;
-            else icnt++;
-        }
-        int nstk = Math.max(icnt-8,0)+Math.max(fcnt-8,0);
-        return (short)nstk;
-    }
-    private static boolean hiddenSelf(TypeFunPtr tfp) {
-        return tfp.nargs() > 0 && tfp.arg(0) == TypePtr.PTR;
-    }
-
-    private static final long CALLEE_SAVE =
-        1L<<X19 |
-        1L<<X20 | 1L<<X21 | 1L<<X22 | 1L<<X23 |
-        1L<<X24 | 1L<<X25 | 1L<<X26 | 1L<<X27 |
-        1L<<X28 |
-        1L<<D9  | 1L<<D10 | 1L<<D11 |
-        1L<<D12 | 1L<<D13 | 1L<<D14 | 1L<<D15;
-    static final long CALLER_SAVE = ~CALLEE_SAVE & ~(1L<<RSP);
-    @Override public long callerSave() { return CALLER_SAVE; }
-    @Override public long neverSave() { return 1L<<RSP; }
-    @Override public RegMask retMask( TypeFunPtr tfp ) {
-        return tfp.ret() instanceof TypeFloat ? D0_MASK : X0_MASK;
-    }
-    @Override public int rpc() { return X30; }
-
-    // Create a split op; any register to any register, including stack slots
-    @Override public SplitNode split(LRG lrg, String kind, byte round) {
-        RegMask def = lrg._machDef==null ? null : lrg._machDef.outregmap(), use = lrg.useMask();
-        if( (def!=null && def.size1() && def.test(FLAGS)) ||
-            (use!=null && use.size1() && use.test(FLAGS)) )
-            return new SplitFlagsARM(lrg,kind,round);
-        // Spilling the saved flags requires a GPR between NZCV and the stack.
-        if( lrg._machDef instanceof SplitFlagsARM || lrg._machDef instanceof SplitGPRARM )
-            return new SplitGPRARM(lrg,kind,round);
-        return new SplitARM(lrg,kind,round);
-    }
-
-    // Return a MachNode unconditional branch
-    @Override public CFGNode jump() {
-        return new UJmpARM();
-    }
-
-    // Instruction selection
-    @Override public Node instSelect(Node n ) {
-        return switch( n ) {
-        case AddNode add     -> add(add);
-        case AndNode and     -> and(and);
-        case BoolNode bool   -> cmp(bool);
-        case CallNode call   -> call(call);
-        case PtrToIntNode ptr -> new PtrToIntMach(ptr);
-        case GuardNode guard -> new GuardMach(guard);
-        case CallEndNode cend-> new CallEndMach(cend);
-        case CLInitNode init -> new CLInitNode(init);
-        case CProjNode c     -> new CProjNode(c);
-        case ConstantNode con-> con(con);
-        case DivNode div     -> div.mode()==2 ? new DivFARM(div) : new DivARM(div);
-        case EscapeNode esc  -> new EscapeNode(esc);
-        case FunNode fun     -> new FunARM(fun);
-        case FunPtrNode  fptr -> fptr(fptr);
-        case IfNode iff      -> jmp(iff);
-        case LoadNode ld     -> ld(ld);
-        case MemMergeNode mem-> new MemMergeNode(mem);
-        case MinusNode neg   -> {
-            if( neg.mode()==2 ) throw Utils.TODO();
-            yield new NegARM(neg);
-        }
-        case MulNode mul     -> mul.mode()==2 ? new MulFARM(mul) : new MulARM(mul);
-        case NewNode nnn     -> new NewARM(nnn);
-        case NotNode not     -> new NotARM(not);
-        case OrNode or       -> or(or);
-        case ParmNode parm   -> new ParmARM(parm);
-        case BulkMemPhiNode phi -> new BulkMemPhiNode(phi);
-        case MemPhiNode phi  -> new MemPhiNode(phi);
-        case PhiNode phi     -> new PhiNode(phi);
-        case ProjNode prj    -> prj(prj);
-        case ReadOnlyNode read -> new ReadOnlyMach(read);
-        case ReturnNode ret  -> new RetARM(ret,ret.fun());
-        case SarNode sar     -> asr(sar);
-        case ShlNode shl     -> lsl(shl);
-        case ShrNode shr     -> lsr(shr);
-        case StartCUNode start -> new StartCUNode(start);
-        case StopCUNode stop   -> new StopCUNode(stop);
-        case StartNode start -> new StartNode(start);
-        case StopNode stop   -> new StopNode(stop);
-        case StoreNode st    -> st(st);
-        case SubNode sub     -> sub.mode()==2 ? new SubFARM(sub) : sub(sub);
-        case ToFloatNode tfn -> new I2F8ARM(tfn);
-        case ToIntegerNode cvt -> new F8ToIARM(cvt);
-        case XorNode xor     -> xor(xor);
-
-        case LoopNode loop   -> new LoopNode(loop);
-        case RegionNode region-> new RegionNode(region);
-        default -> throw Utils.TODO();
-        };
-    }
-
-    private Node cmp(BoolNode bool){
-        Node cmp = _cmp(bool);
-        return new SetARM(cmp, bool.op(), cmp instanceof CmpFARM);
-    }
-    private Node _cmp(BoolNode bool) {
-        if( bool.isFloat() )
-            return new CmpFARM(bool);
-        return bool.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti
-                ? new CmpIARM(bool, (int)ti.value())
-                : new CmpARM(bool);
-    }
-
-    private Node ld(LoadNode ld) {
-        return new LoadARM(address(ld), ld.ptr(), idx, off);
-    }
-
-    private Node jmp(IfNode iff) {
-        // If/Bool combos will match to a Cmp/Set which sets flags.
-        // Most general arith ops will also set flags, which the Jmp needs directly.
-        // Loads do not set the flags, and will need an explicit TEST
-        String op = "!=";
-        boolean fp = false;
-        if( iff.in(1) instanceof BoolNode bool ) { op = bool.op(); fp = bool.isFloat(); }
-        else if( iff.in(1)==null ) op = "=="; // Never-node cutout
-        else iff.setDef(1, new BoolNode.NE(iff.in(1),
-                                           ConstantNode.raw(TypeInteger.ZERO),
-                                           (byte)(iff.in(1)._type instanceof TypeFloat ? 2 : 1)));
-        return new BranchARM(iff, op, fp);
-    }
-
-    private Node add(AddNode add) {
-        if( add.mode()==2 )
-            return new AddFARM(add);
-        return add.in(2) instanceof ConstantNode off && off._con instanceof TypeInteger ti && imm12(ti)
-                ? new AddIARM(add, (int)ti.value())
-                : new AddARM(add);
-    }
-
-    private Node sub(SubNode sub) {
-        return sub.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm12(ti)
-                ? new SubIARM(sub, (int)(ti.value()))
-                : new SubARM(sub);
-    }
-
-    private Node con( ConstantNode con ) {
-        if( !con._con.isConstant() )
-            return ConstantNode.raw(con); // Default unknown caller inputs
-        String ext = con instanceof ExternNode ext0 ? ext0._extern : null;
-        return switch( con._con ) {
-        case TypeInteger ti -> new IntARM(con,ext);
-        case TypeFloat   tf -> new FltARM(con,ext);
-        case TypeMemPtr tmp -> new TMPARM(con,ext);
-        case TypeFunPtr tfp -> new TFPARM(tfp,ext);
-        case TypeNil tn  -> throw Utils.TODO();
-        // TOP, BOTTOM, XCtrl, Ctrl, etc.  Never any executable code.
-        case Type t -> t==Type.NIL ? new IntARM(con,ext) : ConstantNode.raw(con);
-        };
-    }
-
-    private Node fptr( FunPtrNode con ) {
-        return new TFPARM(con);
-    }
-
-    private Node call(CallNode call){
-        return call.fptr() instanceof FunPtrNode fptr
-            ? new CallARM(call, (TypeFunPtr)fptr._type)
-            : call.fptr() instanceof ConstantNode con
-            ? new CallARM(call, (TypeFunPtr)con._type)
-            : new CallRRARM(call);
-    }
-
-    private Node or(OrNode or) {
-        int imm12;
-        return or.in(2) instanceof ConstantNode off && off._con instanceof TypeInteger ti && (imm12 = imm12Logical(ti)) != -1
-                ? new OrIARM(or, imm12)
-                : new OrARM(or);
-    }
-
-    private Node xor(XorNode xor) {
-        int imm12;
-        return xor.in(2) instanceof ConstantNode off && off._con instanceof TypeInteger ti && (imm12 = imm12Logical(ti)) != -1
-                ? new XorIARM(xor, imm12)
-                : new XorARM(xor);
-    }
-
-    private Node and(AndNode and) {
-        int imm12;
-        return and.in(2) instanceof ConstantNode off && off._con instanceof TypeInteger ti && (imm12 = imm12Logical(ti)) != -1
-                ? new AndIARM(and, imm12)
-                : new AndARM(and);
-    }
-
-    private Node asr(SarNode asr) {
-        return asr.in(2) instanceof ConstantNode off && off._con instanceof TypeInteger ti && ti.value() >= 0 && ti.value() < 63
-                ? new AsrIARM(asr, (int)ti.value())
-                : new AsrARM(asr);
-    }
-
-    private Node lsl(ShlNode lsl) {
-        return lsl.in(2)  instanceof ConstantNode off && off._con instanceof TypeInteger ti && ti.value() >= 0 && ti.value() < 63
-                ? new LslIARM(lsl, (int)ti.value())
-                : new LslARM(lsl);
-    }
-
-    private Node lsr(ShrNode lsr) {
-        return lsr.in(2)  instanceof ConstantNode off && off._con instanceof TypeInteger ti && ti.value() >= 0 && ti.value() < 63
-                ? new LsrIARM(lsr, (int)ti.value())
-                : new LsrARM(lsr);
-    }
-
-    private Node prj(ProjNode prj) {
-        if( prj.in(0) instanceof CLInitNode ) return new ProjNode(prj);
-        TypeInteger ret = cReturn(prj);
-        if( ret!=null ) return new ExtendARM(prj,ret);
-        return prj.in(0) instanceof StartNode ? new ProjNode(prj) : new ProjARM(prj);
-    }
-
-    private static int off;
-    private static Node idx;
-    private Node st(StoreNode st) {
-        return new StoreARM(address(st),st.ptr(),idx,off,st.val());
-    }
-
-    // Gather addressing mode bits prior to constructing.  This is a builder
-    // pattern, but saving the bits in a *local* *global* here to keep mess
-    // contained.
-    private <N extends MemOpNode> N address(N mop ) {
-        off = 0;  // Reset
-        idx = null;
-        Node base = mop.ptr();
-        // Skip/throw-away a ReadOnly, only used to typecheck
-        if( base instanceof ReadOnlyNode read ) base = read.in(1);
-        assert !(base instanceof AddNode) && base._type instanceof TypeMemPtr; // Base ptr always, not some derived
-        if( mop.off() instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm9(ti) ) {
-            off = (int)ti.value();
-            assert off == ti.value(); // In 32-bit range
-        } else {
-            idx = mop.off();
-        }
-        return mop;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AUIPC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AUIPC.java
deleted file mode 100644
index 59bad64e..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AUIPC.java
+++ /dev/null
@@ -1,42 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.FunPtrNode;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Add upper 20bits to PC.  Immediate comes from the relocation info.
-public class AUIPC extends FunPtrNode implements MachNode, RIPRelSize {
-    AUIPC( FunPtrNode fptr ) { super(fptr); }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public AUIPC copy() { return new AUIPC(this); }
-    @Override public String op() { return "auipc"; }
-    @Override public void encoding( Encoding enc ) {
-        enc.relo(this);
-        short dst = enc.reg(this);
-        enc.add4(RiscV.u_type(RiscV.OP_AUIPC, dst, 0));
-    }
-
-    // Delta is from opcode start, but X86 measures from the end of the 5-byte encoding
-    @Override public byte encSize(int delta) { return 4; }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        //short rpc = enc.reg(this);
-        //// High half is where the TFP constant used to be, the last input
-        //short auipc = enc.reg(in(_inputs._len-1));
-        //enc.patch4(opStart,RiscV.i_type(0x67, rpc, 0, auipc, delta));
-        throw Utils.TODO();
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        String reg = code.reg(this);
-        sb.p(reg).p(" = PC+#");
-        _type.print(sb);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AddFRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AddFRISC.java
deleted file mode 100644
index d87e49b9..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AddFRISC.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// fadd.d
-public class AddFRISC extends MachConcreteNode implements MachNode {
-    AddFRISC(Node addf) {super(addf);}
-    @Override public String op() { return "addf"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return riscv.FMASK; }
-    @Override public RegMask outregmap() { return riscv.FMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.rf_type(enc,this,RiscV.RM.RNE,1); }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" + ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AddIRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AddIRISC.java
deleted file mode 100644
index 8012b61e..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AddIRISC.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.Utils;
-
-public class AddIRISC extends ImmRISC {
-    // Used to inst-selection as a direct match against an ideal Add/Sub
-    public AddIRISC( Node add, int imm12, boolean pop ) { super(add,imm12,pop); }
-    @Override public String op() { return "addi"; }
-    @Override public String glabel() { return "+"; }
-    @Override int opcode() {  return RiscV.OP_IMM; }
-    @Override int func3() {return 0;}
-    @Override public AddIRISC copy() {
-        // Clone the AddI, using the same inputs-only code used during inst select.
-        // Output edges are missing.
-        AddIRISC add = new AddIRISC(in(1),_imm12,false);
-        // Copys happen when output edges should be valid, so correct missing output edges.
-        in(1)._outputs.add(add);
-        return add;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AddRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AddRISC.java
deleted file mode 100644
index 7010916f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AddRISC.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class AddRISC extends MachConcreteNode implements MachNode {
-    public AddRISC( Node add ) { super(add); }
-    AddRISC( Node base, Node off ) {
-        super(new Node[3]);
-        _inputs.set(1,base);
-        _inputs.set(2,off );
-    }
-    @Override public String op() { return "add"; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.r_type(enc,this,0,0);  }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" + ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AndIRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AndIRISC.java
deleted file mode 100644
index 9fd65e7d..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AndIRISC.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.Utils;
-
-public class AndIRISC extends ImmRISC {
-    public AndIRISC( Node and, int imm) { super(and,imm); }
-    @Override public String op() { return "andi"; }
-    @Override public String glabel() { return "&"; }
-    @Override int opcode() {  return RiscV.OP_IMM; }
-    @Override int func3() {return 7;}
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AndRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AndRISC.java
deleted file mode 100644
index 1845985e..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/AndRISC.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class AndRISC extends MachConcreteNode implements MachNode {
-    public AndRISC(Node and) { super(and); }
-    @Override public String op() { return "and"; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.r_type(enc,this,0b111,0);  }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" & ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/BranchRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/BranchRISC.java
deleted file mode 100644
index a9d03da5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/BranchRISC.java
+++ /dev/null
@@ -1,95 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Conditional branch such as: BEQ
-public class BranchRISC extends IfNode implements MachNode, RIPRelSize {
-    String _bop;
-    // label is obtained implicitly
-    public BranchRISC( IfNode iff, String bop, Node n1, Node n2 ) {
-        super(iff);
-        _bop = bop;
-        _inputs.setX(1,n1);
-        _inputs.setX(2,n2);
-    }
-
-    @Override public String op() { return "b"+_bop; }
-    @Override public String label() { return op(); }
-    @Override public String comment() { return "L"+cproj(1)._nid; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return null; }
-    @Override public void negate() {
-        _bop = negate(_bop);
-        // Cannot encode ">" or "<=", so flip these
-        if( _bop.equals(">") || _bop.equals("<=") ) {
-            swap12();           // Cannot negate the test, so swap the operands
-            _bop = swap(_bop);  // Swap test to match
-        }
-    }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        p.p("if( ");
-        if( in(1)==null ) p.p("0");
-        else p.n(in(1));
-        p.p(_bop);
-        if( in(2)==null ) p.p("0");
-        else p.n(in(2));
-        return p.p(" )");
-    }
-
-    @Override public void encoding( Encoding enc ) {
-        if( in(1)==null && _bop=="!=" ) return; // Inverted never-node, no code
-        enc.jump(this,cproj(0));
-        if( in(1)==null )       // Never node
-            enc.add4(RiscV.j_type(RiscV.OP_JAL, 0, 0));
-        else {
-            // Todo: relocs (for offset - immf)
-            short src1 = enc.reg(in(1));
-            short src2 = in(2)==null ? (short)riscv.ZERO : enc.reg(in(2));
-            enc.add4(RiscV.b_type(RiscV.OP_BRANCH, RiscV.jumpop(_bop), src1, src2, 0));
-        }
-    }
-
-    // Delta is from opcode start
-    @Override public byte encSize(int delta) {
-        if( in(1)==null && _bop=="!=" ) return 0; // Inverted never-node, no code
-        if( -4*1024 <= delta && delta < 4*1024 ) return 4;
-        // 2 word encoding needs a tmp register, must teach RA
-        throw Utils.TODO();
-    }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        assert !( in(1)==null && _bop=="!=" ); // Inverted never-node, no code no patch
-        if( in(1)==null ) {     // Never node
-            enc.patch4(opStart,RiscV.j_type(RiscV.OP_JAL, 0, delta));
-        } else {
-            short src1 = enc.reg(in(1));
-            short src2 = in(2)==null ? (short)riscv.ZERO : enc.reg(in(2));
-            if( opLen==4 ) {
-                enc.patch4(opStart,RiscV.b_type(RiscV.OP_BRANCH, RiscV.jumpop(_bop), src1, src2, delta));
-            } else {
-                throw Utils.TODO();
-            }
-        }
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        if( in(1)==null && _bop=="!=" ) {
-            sb.p("never");
-            return;
-        }
-        String src1 = in(1)==null ? "#0" : code.reg(in(1));
-        String src2 = in(2)==null ? "#0" : code.reg(in(2));
-        sb.p(src1).p(" ").p(_bop).p(" ").p(src2).p(" ");
-        CFGNode prj = cproj(0).uctrlSkipEmpty();
-        if( !prj.blockHead() ) prj = prj.cfg0();
-        sb.p(label(prj));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/CallRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/CallRISC.java
deleted file mode 100644
index b1426a3f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/CallRISC.java
+++ /dev/null
@@ -1,62 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeFunPtr;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class CallRISC extends CallNode implements MachNode, RIPRelSize {
-    final TypeFunPtr _tfp;
-    final String _name;
-    CallRISC( CallNode call, TypeFunPtr tfp ) {
-        super(call);
-        assert tfp.isConstant();
-        _inputs.pop(); // Pop constant target
-        _tfp = tfp;
-        _name = CodeGen.CODE.funcName(tfp.fidx());
-    }
-
-    @Override public String op() { return "call"; }
-    @Override public String label() { return op(); }
-    @Override public String name() { return _name; }
-    @Override public TypeFunPtr tfp() { return _tfp; }
-    @Override public RegMask regmap(int i) { return riscv.callInMask(_tfp,i,fun()._maxArgSlot); }
-    @Override public RegMask outregmap() { return riscv.RPC_MASK; }
-    @Override public int nargs() { return nIns()-2; } // Minus control, memory, fptr
-
-    @Override public void encoding( Encoding enc ) {
-        // Short form +/-4K:  beq r0,r0,imm12
-        // Long form:  auipc rX,imm20/32; jal r0,[rX+imm12/32]
-        FunNode fun = CodeGen.CODE.link(_tfp);
-        if( fun==null ) enc.external(this,_name);
-        else enc.relo(this);
-        short rpc = enc.reg(this);
-        enc.add4(RiscV.j_type(RiscV.OP_JAL, rpc, 0));
-    }
-
-    // Delta is from opcode start
-    @Override public byte encSize(int delta) {
-        if( -(1L<<20) <= delta && delta < (1L<<20) ) return 4;
-        // 2 word encoding needs a tmp register, must teach RA
-        throw Utils.TODO();
-    }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        short rpc = enc.reg(this);
-        if( opLen==4 ) {
-            enc.patch4(opStart,RiscV.j_type(RiscV.OP_JAL, rpc, delta));
-        } else {
-            throw Utils.TODO();
-        }
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(_name).p("  ");
-        for( int i=0; i<nargs(); i++ )
-            sb.p(code.reg(arg(i+2))).p(", ");
-        sb.unchar(2);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/CallRRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/CallRRISC.java
deleted file mode 100644
index cda4bc79..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/CallRRISC.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class CallRRISC extends CallNode implements MachNode {
-    CallRRISC( CallNode call ) { super(call); }
-    @Override public String op() { return "callr"; }
-    @Override public String label() { return op(); }
-    @Override public RegMask regmap(int i) {
-        return i==_inputs._len-1
-            ? riscv.RMASK                // Function call target
-            : riscv.callInMask(tfp(),i,fun()._maxArgSlot); // Normal argument
-    }
-    @Override public RegMask outregmap() { return riscv.RPC_MASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        short rpc = enc.reg(this);
-        short src = enc.reg(in(_inputs._len-1));
-        int body = RiscV.i_type(RiscV.OP_JALR, rpc, 0, src, 0);
-        enc.add4(body);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(fptr())).p("  ");
-        for( int i=0; i<nargs(); i++ )
-            sb.p(code.reg(arg(i))).p(", ");
-        sb.unchar(2);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/DivFRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/DivFRISC.java
deleted file mode 100644
index 8eb4fb3b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/DivFRISC.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// fdiv.d
-public class DivFRISC extends MachConcreteNode implements MachNode{
-    DivFRISC(Node divf) {super(divf);}
-    @Override public String op() { return "divf"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return riscv.FMASK; }
-    @Override public RegMask outregmap() { return riscv.FMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.rf_type(enc,this,RiscV.RM.RUP,13); }
-    // Default on double precision for now(64 bits)
-    // General form: "fdiv.d  rd = src1 / src2
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" / ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/DivRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/DivRISC.java
deleted file mode 100644
index 515ffa47..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/DivRISC.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-
-public class DivRISC extends MachConcreteNode implements MachNode{
-    public DivRISC(Node div) {super(div);}
-    @Override public String op() { return "div"; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.r_type(enc,this,4,1);  }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" / ").p(code.reg(in(2)));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ExtendRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ExtendRISC.java
deleted file mode 100644
index 5bd3ec1c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ExtendRISC.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-
-// Convert a narrow C return register to Simple's full-width integer value.
-public class ExtendRISC extends MachConcreteNode {
-    final int _bits;
-    final boolean _signed;
-    ExtendRISC(ProjNode prj, TypeInteger ret) {
-        super(prj);
-        _inputs.set(0,null);
-        _inputs.add(new ProjRISC(prj));
-        _bits = 8 << ret.log_size();
-        _signed = ret._min < 0;
-    }
-    @Override public String op() { return (_signed ? "sext" : "zext")+_bits; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding(Encoding enc) {
-        short dst = enc.reg(this), src = enc.reg(in(1));
-        int shift = 64-_bits;
-        enc.add4(RiscV.i_type(RiscV.OP_IMM,dst,1,src,shift));
-        enc.add4(RiscV.i_type(RiscV.OP_IMM,dst,5,dst,shift | (_signed ? 0x400 : 0)));
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/F8ToIRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/F8ToIRISC.java
deleted file mode 100644
index a56ad216..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/F8ToIRISC.java
+++ /dev/null
@@ -1,19 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class F8ToIRISC extends MachConcreteNode implements MachNode {
-    F8ToIRISC(Node f8toi) {super(f8toi);}
-    @Override public String op() { return "cvti"; }
-    @Override public RegMask regmap(int i) { assert i==1; return riscv.FMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        RiscV.floatToInteger(enc,enc.reg(this),enc.reg(in(1))-riscv.F_OFFSET);
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p("(int)").p(code.reg(in(1)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/FltRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/FltRISC.java
deleted file mode 100644
index a110d156..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/FltRISC.java
+++ /dev/null
@@ -1,48 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.ConstantNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.type.TypeFloat;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class FltRISC extends ConstantNode implements MachNode, RIPRelSize {
-    final String _ext;
-    FltRISC( ConstantNode con, String ext ) { super(con); _ext = ext; }
-    @Override public String op() { return "ld8"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return riscv.FMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public FltRISC copy() { return new FltRISC(this,_ext); }
-
-    @Override public void encoding( Encoding enc ) {
-        enc.largeConstant(this,_con, 0, -1);
-        short dst = (short)(enc.reg(this) - riscv.F_OFFSET);
-        short tmp = (short)riscv.T6;
-        // AUIPC dst,#hi20_constant_pool
-        enc.add4(RiscV.u_type(RiscV.OP_AUIPC, tmp, 0));
-        // Load dst,[dst+#low12_constant_pool]
-        enc.add4(RiscV.i_type(RiscV.OP_LOADFP, dst, 0b11, tmp, 0));
-    }
-    @Override public RegMask killmap() { return new RegMask(riscv.T6); }
-
-    // Delta is from opcode start.
-    @Override public byte encSize(int delta) { return 8;  }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        short dst = (short)(enc.reg(this) - riscv.F_OFFSET);
-        short tmp = (short)riscv.T6;
-        // AUIPC dst,#hi20_constant_pool
-        enc.patch4(opStart  , RiscV.u_type(RiscV.OP_AUIPC, tmp, delta>>12));
-        // Load dst,[dst+#low12_constant_pool]
-        enc.patch4(opStart+4, RiscV.i_type(RiscV.OP_LOADFP, dst, 0b11, tmp, delta & 0xFFF));
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        _con.print(sb.p(code.reg(this)).p(" = #"));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/FunRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/FunRISC.java
deleted file mode 100644
index d3d64b06..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/FunRISC.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.FunNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class FunRISC extends FunNode implements MachNode {
-    FunRISC(FunNode fun) {super(fun);}
-    @Override public void computeFrameAdjust(CodeGen code, int maxReg) {
-        super.computeFrameAdjust(code,maxReg);
-        if( _hasCalls )         // If non-leaf, pad to 16b
-            _frameAdjust = ((_frameAdjust+8) & -16);
-    }
-    @Override public void encoding( Encoding enc ) {
-        int sz = _frameAdjust;
-        if( sz == 0 ) return; // Skip if no frame adjust
-        if( sz >= 1L<<12 ) throw Utils.TODO();
-        enc.add4(RiscV.i_type(RiscV.OP_IMM, riscv.RSP, 0, riscv.RSP, -sz & 0xFFF));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/I2F8RISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/I2F8RISC.java
deleted file mode 100644
index 1b53ab0f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/I2F8RISC.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// fcvt.d.w
-// Converts a 32-bit signed integer, in integer register rs1 into a double-precision floating-point number in floating-point register rd.
-public class I2F8RISC extends MachConcreteNode implements MachNode {
-    I2F8RISC(Node i2f8) {super(i2f8);}
-    @Override public String op() { return "cvtf"; }
-    @Override public RegMask regmap(int i) { assert i==1; return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.FMASK; }
-    @Override public void encoding( Encoding enc ) {
-        short dst  = (short)(enc.reg(this )-riscv.F_OFFSET);
-        short src1 =         enc.reg(in(1));
-        int body = RiscV.r_type(RiscV.OP_FP,dst,RiscV.RM.RNE.ordinal(),src1,0,0x69);
-        enc.add4(body);
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p("(flt)").p(code.reg(in(1)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ImmRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ImmRISC.java
deleted file mode 100644
index ee247c3e..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ImmRISC.java
+++ /dev/null
@@ -1,55 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-
-abstract public class ImmRISC extends MachConcreteNode implements MachNode {
-    public final int _imm12;
-    ImmRISC( Node add, int imm12, boolean pop ) {
-        super(add);
-        _imm12 = imm12;
-        // If pop, we are moving from an ideal Node to MachNode; the ideal Node
-        // inputs got copied here, but we are absorbing the immediate into the
-        // MachNode and so do not want the constant input.
-        if( pop ) _inputs.pop();
-        // if NOT pop, we are the 2nd-half of a 2-part expansion, reset the
-        // input edges to no-control
-        else { _inputs.set(0,null); _inputs.setX(1,add); }
-    }
-    ImmRISC( Node add, int imm12 ) { this(add,imm12,true); }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public boolean isClone() {
-        // Allow cloning of the 2nd half of a 2-part constant; this might
-        // trigger cloning the first part also.
-        return in(1) instanceof LUI || in(1) instanceof AUIPC;
-    }
-
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) {
-        int imm12 = (_imm12<<20)>>20; // Sign extend 12 bits
-        p.p("( ").n(in(1));
-        return p.p(String.format(" %s #%d )",glabel(),imm12));
-    }
-
-    abstract int opcode();
-    abstract int func3();
-
-    @Override public void encoding( Encoding enc ) {
-        short dst = enc.reg(this );
-        short src = enc.reg(in(1));
-        enc.add4(RiscV.i_type(opcode(), dst, func3(), src, _imm12 & 0xFFF));
-    }
-
-    // General form: "addi  rd = rs1 + imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        int imm12 = (_imm12<<20)>>20; // Sign extend 12 bits
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" ").p(glabel()).p(" #").p(imm12);
-        if( in(1) instanceof LUI lui )
-            sb.p(" // #").hex4((int)(((TypeInteger)lui._con).value()) + imm12);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/Int8RISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/Int8RISC.java
deleted file mode 100644
index dd4a02a3..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/Int8RISC.java
+++ /dev/null
@@ -1,49 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.ConstantNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Special instruction for loading 8 byte constants from the constant pool.
-
-public class Int8RISC extends ConstantNode implements MachNode, RIPRelSize {
-    final String _ext;
-    Int8RISC( ConstantNode con, String ext ) { super(con); _ext = ext; }
-    @Override public String op() { return "ld8"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public Int8RISC copy() { return new Int8RISC(this,_ext); }
-
-    @Override public byte encSize(int delta) { return 8;  }
-
-    @Override public void encoding( Encoding enc ) {
-        if( _ext!=null ) throw Utils.TODO();
-        short dst  = enc.reg(this);
-        short tmp = (short)riscv.T6;
-        enc.largeConstant(this,_con, 0, -1);
-        // AUIPC dst,#hi20_constant_pool
-        enc.add4(RiscV.u_type(RiscV.OP_AUIPC, tmp, 0));
-        // Load dst,[dst+#low12_constant_pool]
-        enc.add4(RiscV.i_type(RiscV.OP_LOAD, dst, 0b11, tmp, 0));
-    }
-    @Override public RegMask killmap() { return new RegMask(riscv.T6); }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        short dst = enc.reg(this);
-        short tmp = (short)riscv.T6;
-        // AUIPC dst,#hi20_constant_pool
-        enc.patch4(opStart  , RiscV.u_type(RiscV.OP_AUIPC, tmp, delta>>12));
-        // Load dst,[dst+#low12_constant_pool]
-        enc.patch4(opStart+4, RiscV.i_type(RiscV.OP_LOAD, dst, 0b11, tmp, delta & 0xFFF));
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        _con.print(sb.p(code.reg(this)).p(" = #"));
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/IntRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/IntRISC.java
deleted file mode 100644
index 35d2bc65..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/IntRISC.java
+++ /dev/null
@@ -1,31 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.ConstantNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-
-// 12-bit integer constant.  Larger constants are made up in the instruction
-// selection by adding with a LUI.
-public class IntRISC extends ConstantNode implements MachNode {
-    IntRISC(ConstantNode con) { super(con); }
-    @Override public String op() { return "ldi"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public IntRISC copy() { return new IntRISC(this); }
-    @Override public void encoding( Encoding enc ) {
-        short dst  = enc.reg(this);
-        int val = _con==Type.NIL ? 0 : (int)(((TypeInteger)_con).value() & 0xFFF);
-        // Explicit truncation of larger immediates; this will sign-extend on
-        // load and this is handled during instruction selection.
-        enc.add4(RiscV.i_type(RiscV.OP_IMM, dst, 0, riscv.ZERO, val));
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        String reg = code.reg(this);
-        _con.print(sb.p(reg).p(" = #"));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/LUI.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/LUI.java
deleted file mode 100644
index aedd8b47..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/LUI.java
+++ /dev/null
@@ -1,33 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.ConstantNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-
-// Load upper 20bits.
-public class LUI extends ConstantNode implements MachNode {
-    public LUI( int imm20 ) {
-        super(TypeInteger.constant(imm20));
-        assert (imm20 & 0xFFF)==0;
-    }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public LUI copy() { return new LUI((int)((TypeInteger)_con).value()); }
-    @Override public String op() { return "lui"; }
-    @Override public void encoding( Encoding enc ) {
-        long x = ((TypeInteger)_con).value();
-        int imm20 = (int)(x>>12) & 0xFFFFF;
-        short dst = enc.reg(this);
-        int lui = RiscV.u_type(RiscV.OP_LUI, dst, imm20);
-        enc.add4(lui);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        String reg = code.reg(this);
-        sb.p(reg).p(" = #").hex4((int)(((TypeInteger)_con).value()));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/LoadRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/LoadRISC.java
deleted file mode 100644
index e9f3ec02..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/LoadRISC.java
+++ /dev/null
@@ -1,65 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Load memory addressing on RISC
-// Support imm, reg(direct), or reg+off(indirect) addressing
-// Base = base - base pointer, offset is added to base
-// idx  = null
-// off  = off - imm12 added to base
-public class LoadRISC extends MemOpRISC {
-    public LoadRISC(LoadNode ld, Node base, int off) { super(ld, base, off, null); }
-    @Override public String op() { return "ld" +_sz; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.MEM_MASK; }
-    @Override public void encoding( Encoding enc ) {
-        short dst = enc.reg(this );
-        short ptr = enc.reg(ptr());
-        int op = dst >= riscv.F_OFFSET ? RiscV.OP_LOADFP  : RiscV.OP_LOAD;
-        if( dst >= riscv.F_OFFSET  ) dst -= riscv.F_OFFSET;
-        enc.add4(RiscV.i_type(op, dst, func3(), ptr, _off));
-    }
-    @Override int func3() {
-        int func3 = -1;
-        // no unsigned flavour for store, so both signed and unsigned trigger the same
-        Type declType = _con;
-        if( declType == TypeInteger. I8 ) func3=0; // LB
-        if( declType == TypeInteger.I16 ) func3=1; // LH
-        if( declType == TypeInteger.I32 ) func3=2; // LW
-        if( declType == TypeInteger.BOT ) func3=3; // LD
-        if( declType == TypeInteger. U8 ) func3=4; // LBU
-        if( declType == TypeInteger.BOOL) func3=4; // LBU
-        if( declType == TypeInteger.U16 ) func3=5; // LHU
-        if( declType == TypeInteger.U32 ) func3=6; // LWU
-        if( declType instanceof TypeInteger ti ) {
-            if( -128 <= ti._min && ti._max < 128 ) func3 = 0; // LB
-        }
-
-        // float
-        if( declType == TypeFloat.F32) func3 = 2; // fLW   fSW
-        if( declType == TypeFloat.F64) func3 = 3; // fLD   fSD
-
-        if( declType instanceof TypeMemPtr) func3 = 3; // 8 byte pointers (pick ld)
-        if( declType instanceof TypeFunPtr) func3 = 3; // 8 byte function pointers
-        if( declType instanceof TypeConAry ary )
-            func3 = switch( ary.log_size() ) {
-            case 0 -> 4;         // LBU
-            case 1 -> 5;         // LHU
-            case 2 -> 2;         // LW
-            case 3 -> 3;         // LD
-            default -> throw Utils.TODO("RISC-V constant-array load for "+declType);
-            };
-        if( func3 == -1 ) throw Utils.TODO("RISC-V load for "+declType);
-        return func3;
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(",");
-        asm_address(code,sb);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/MemOpRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/MemOpRISC.java
deleted file mode 100644
index e0bbc219..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/MemOpRISC.java
+++ /dev/null
@@ -1,51 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-
-public abstract class MemOpRISC extends MemOpNode implements MachNode {
-    final int _off;             // Limit 12 bits
-    final char _sz;
-    final int _bytes;
-    MemOpRISC(MemOpNode mop, Node base, int off, Node val) {
-        super(mop,mop);
-        assert base._type instanceof TypeMemPtr;
-        _inputs.setX(2, base ); // Base can be an Add, is no longer raw object base
-        _inputs.setX(3, null);  // Never an index
-        _inputs.setX(4, val );
-        _off = off;
-        _bytes = mop instanceof StoreNode st ? st.storeSize() : 1<<_con.log_size();
-        _sz = (char)('0'+_bytes);
-    }
-
-    @Override public String label() { return op(); }
-    Node val() { return in(4); } // Only for stores
-
-    @Override protected ExprPrinter<Node> _printMach(ExprPrinter<Node> p) { return p.p(".").p(_name); }
-
-    @Override public Type compute() { throw new AssertionError("Do not call compute on "+getClass().getSimpleName()); }
-    @Override public Node idealize() { throw new AssertionError("Do not call idealize on "+getClass().getSimpleName()); }
-
-    // func3 is based on load/store size and extend
-    abstract int func3();
-
-    // Register mask allowed on input i.
-    @Override public RegMask regmap(int i) {
-        // 0 - ctrl
-        // 1 - memory
-        if( i==2 ) return riscv.RMASK;    // base
-        // 2 - index
-        if( i==4 ) return riscv.MEM_MASK; // value
-        throw Utils.TODO();
-    }
-
-    SB asm_address(CodeGen code, SB sb) {
-        sb.p("[").p(code.reg(ptr())).p("+");
-        return sb.p(_off).p("]");
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/MulFRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/MulFRISC.java
deleted file mode 100644
index dacec2b5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/MulFRISC.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// fmul.d
-public class MulFRISC extends MachConcreteNode implements MachNode {
-    MulFRISC(Node mulf) {super(mulf);}
-    @Override public String op() { return "mulf"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return riscv.FMASK; }
-    @Override public RegMask outregmap() { return riscv.FMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.rf_type(enc,this,RiscV.RM.RNE,9); }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" * ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/MulRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/MulRISC.java
deleted file mode 100644
index 9cb9ace7..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/MulRISC.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// mulh signed multiply instruction(no-imm form)
-public class MulRISC extends MachConcreteNode implements MachNode{
-    public MulRISC(Node mul) {super(mul);}
-    @Override public String op() { return "mul"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.r_type(enc,this,0,1);  }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" * ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/NegRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/NegRISC.java
deleted file mode 100644
index 3070c56c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/NegRISC.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class NegRISC extends MachConcreteNode implements MachNode {
-    public NegRISC( Node neg ) { super(neg); }
-    @Override public String op() { return "neg"; }
-    @Override public RegMask regmap(int i) { assert i==1; return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        short dst = enc.reg(this );
-        short src = enc.reg(in(1));
-        RiscV.r_type(RiscV.OP,dst,0,0,src,0x20);
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = -").p(code.reg(in(1)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/NewRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/NewRISC.java
deleted file mode 100644
index 40d0359c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/NewRISC.java
+++ /dev/null
@@ -1,49 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.print.ASMPrinter;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class NewRISC extends NewNode implements MachNode, RIPRelSize {
-    // A pre-zeroed chunk of memory.
-    NewRISC( NewNode nnn ) { super(nnn); }
-    @Override public void encoding( Encoding enc ) {
-        // Generic external encoding; 2 ops.
-        enc.external(this,"calloc");
-        // A1 is a caller-save, allowed to crush building external address
-        // auipc
-        enc.add4(RiscV.i_type(RiscV.OP_IMM  , _arg2Reg , 0, riscv.ZERO, 1));
-        enc.add4(RiscV.u_type(RiscV.OP_AUIPC, riscv.A2 , 0));
-        enc.add4(RiscV.i_type(RiscV.OP_JALR , riscv.RPC, 0, riscv.A2, 0));
-    }
-
-    // Patch is for running "new" in a JIT.
-    // Delta is from opcode start
-    @Override public byte encSize(int delta) { return 4*3; }
-
-    // Patch is for running "new" in a JIT.
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        // Negative patches are JIT emulator targets.
-        if( opStart+delta < 0 ) {
-            delta -= 4;         // Offset from the AUIPC start
-            int imm20 = delta>>12;
-            if( ((delta>>11)&1)==1 ) imm20++; // Correct accidental sign extension
-            int imm12 = delta&0xFFF;
-            enc.patch4(opStart+4,RiscV.u_type(RiscV.OP_AUIPC, riscv.A2 , imm20));
-            enc.patch4(opStart+8,RiscV.i_type(RiscV.OP_JALR , riscv.RPC, 0, riscv.A2, imm12));
-        } else
-            throw Utils.TODO();
-    }
-
-    // General form: "alloc #bytes  PC"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p("\n");             // Multi-op trigger
-        sb.p("ldi   ").p(code._mach.regs()[_arg2Reg]).p(" = #1\n");
-        sb.p("auipc a2=#calloc\n");
-        sb.p("call  a2+#calloc");
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/NotRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/NotRISC.java
deleted file mode 100644
index 6f499db1..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/NotRISC.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.MachConcreteNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.NotNode;
-import com.seaofnodes.simple.util.SB;
-
-public class NotRISC extends MachConcreteNode implements MachNode {
-    public NotRISC(NotNode not) { super(not); }
-    @Override public String op() { return "not"; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap()   { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        short dst = enc.reg(this );
-        short src = enc.reg(in(1));
-        // SEQZ is unsigned: negative nonzero inputs must also produce false.
-        enc.add4(RiscV.i_type(RiscV.OP_IMM, dst, 3, src, 1));
-    }
-    @Override public void asm(CodeGen code, SB sb) { sb.p(code.reg(this)); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/OrIRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/OrIRISC.java
deleted file mode 100644
index 937595a3..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/OrIRISC.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.Utils;
-
-public class OrIRISC extends ImmRISC {
-    public OrIRISC( Node and, int imm) { super(and,imm); }
-    @Override int opcode() {  return RiscV.OP_IMM; }
-    @Override int func3() {  return 6; }
-    @Override public String glabel() { return "|"; }
-    @Override public String op() { return "ori"; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/OrRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/OrRISC.java
deleted file mode 100644
index a310a1f4..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/OrRISC.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class OrRISC extends MachConcreteNode implements MachNode {
-    public OrRISC(Node or) { super(or); }
-    @Override public String op() { return "or"; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.r_type(enc,this,6,0);  }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" | ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ParmRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ParmRISC.java
deleted file mode 100644
index 0f8db4e5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ParmRISC.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.ParmNode;
-
-public class ParmRISC extends ParmNode implements MachNode {
-    final RegMask _rmask;
-    ParmRISC(ParmNode parm) {
-        super(parm);
-        _rmask = riscv.callInMask(fun().sig(),_idx,0);
-    }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return _rmask; }
-    @Override public void encoding( Encoding enc ) { }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ProjRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ProjRISC.java
deleted file mode 100644
index 2f9ac469..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/ProjRISC.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.ProjNode;
-
-public class ProjRISC extends ProjNode implements MachNode {
-    ProjRISC(ProjNode p) { super(p); }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() {
-        return ((MachNode)in(0)).outregmap(_idx);
-    }
-    @Override public void encoding( Encoding enc ) { }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/RetRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/RetRISC.java
deleted file mode 100644
index 33143c6b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/RetRISC.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.FunNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.ReturnNode;
-import com.seaofnodes.simple.util.Utils;
-
-public class RetRISC extends ReturnNode implements MachNode {
-    public RetRISC(ReturnNode ret, FunNode fun) { super(ret, fun); fun.setRet(this); }
-    @Override public void encoding( Encoding enc ) {
-        int sz = fun()._frameAdjust;
-        if( sz >= 1L<<12 ) throw Utils.TODO();
-        if( sz != 0 )
-            enc.add4(RiscV.i_type(RiscV.OP_IMM, riscv.RSP, 0, riscv.RSP, sz & 0xFFF));
-        short rpc = enc.reg(rpc());
-        enc.add4(RiscV.i_type(RiscV.OP_JALR, riscv.ZERO, 0, rpc, 0));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SetFRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SetFRISC.java
deleted file mode 100644
index d037dd5c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SetFRISC.java
+++ /dev/null
@@ -1,34 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.BoolNode;
-import com.seaofnodes.simple.node.MachConcreteNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.util.SB;
-
-// corresponds to feq.d = equal
-//                fle.d = less than or equal
-//                flt.d = less than
-public class SetFRISC extends MachConcreteNode implements MachNode {
-    final String _bop;          // One of <,<=,==
-    SetFRISC( BoolNode bool ) {
-        super(bool);
-        assert bool.isFloat();
-        _bop = bool.op();
-    }
-    @Override public String op() { return "set"+_bop; }
-    @Override public RegMask regmap(int i) { return riscv.FMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        short dst  =         enc.reg(this );
-        short src1 = (short)(enc.reg(in(1))-riscv.F_OFFSET);
-        short src2 = (short)(enc.reg(in(2))-riscv.F_OFFSET);
-        int body = RiscV.r_type(RiscV.OP_FP,dst,RiscV.fsetop(_bop),src1,src2,0b1010001/*FCMP*/);
-        enc.add4(body);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" ").p(_bop).p(" ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SetIRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SetIRISC.java
deleted file mode 100644
index 9bc86565..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SetIRISC.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.util.Utils;
-import com.seaofnodes.simple.node.Node;
-
-// corresponds to slti,sltiu
-public class SetIRISC extends ImmRISC {
-    final boolean _unsigned;    // slti vs sltiu
-    public SetIRISC( Node src, int imm12, boolean unsigned ) {
-        this(src,imm12,unsigned,true);
-    }
-    public SetIRISC( Node src, int imm12, boolean unsigned, boolean pop ) {
-        super(src,imm12,pop);
-        if( !pop ) _inputs.setLen(2);
-        _unsigned = unsigned;
-    }
-    @Override public String op() { return "slt" + (_unsigned ? "u":"") + "i"; }
-    @Override public String glabel() { return  "<"+ (_unsigned ? "u":""); }
-    @Override int opcode() { return 0b0010011; }
-    @Override int func3() { return _unsigned ? 0b011 : 0b010; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SetRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SetRISC.java
deleted file mode 100644
index 848cc59f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SetRISC.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// corresponds to slt sltu
-public class SetRISC extends MachConcreteNode implements MachNode {
-    final boolean _unsigned;
-    public SetRISC( Node cmp, boolean unsigned ) { super(cmp); _unsigned=unsigned; }
-    @Override public String op() { return "slt" + (_unsigned ? "u":""); }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        riscv.r_type(enc,this,_unsigned ? 0b011 : 0b010,0);
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" < ").p(code.reg(in(2)));
-    }
-}
\ No newline at end of file
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SllIRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SllIRISC.java
deleted file mode 100644
index 1425caa2..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SllIRISC.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.Utils;
-
-public class SllIRISC extends ImmRISC {
-    public SllIRISC( Node and, int imm) { super(and,imm); }
-    @Override int opcode() {  return RiscV.OP_IMM; }
-    @Override int func3() {  return 1; }
-    @Override public String glabel() { return "<<"; }
-    @Override public String op() { return "slli"; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SllRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SllRISC.java
deleted file mode 100644
index 5a4d4cc6..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SllRISC.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// Shift left logical
-public class SllRISC extends MachConcreteNode implements MachNode {
-    public SllRISC(Node sll) { super(sll); }
-    @Override public String op() { return "shl"; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.r_type(enc,this,1,0);  }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" << ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SplitRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SplitRISC.java
deleted file mode 100644
index d455337b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SplitRISC.java
+++ /dev/null
@@ -1,61 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.FunNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.node.SplitNode;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class SplitRISC extends SplitNode {
-    SplitRISC( LRG lrg, String kind, byte round ) { super(lrg, kind,round, new Node[2]); }
-    @Override public RegMask regmap(int i) { return riscv.SPLIT_MASK; }
-    @Override public RegMask outregmap() { return riscv.SPLIT_MASK; }
-    @Override public void encoding( Encoding enc ) {
-        short dst = enc.reg(this );
-        short src = enc.reg(in(1));
-
-        // Flag for being either XMM or stack
-        boolean dstX = dst >= riscv.F_OFFSET;
-        boolean srcX = src >= riscv.F_OFFSET;
-
-        if( dst >= riscv.MAX_REG ) {
-            // Store to SP
-            if( src >= riscv.MAX_REG ) {
-                throw Utils.TODO(); // Very rare stack-stack move
-            }
-            int off = fun(enc).computeStackOffset(enc._code,dst);
-            int op = srcX ? RiscV.OP_STOREFP : RiscV.OP_STORE;
-            if( srcX ) src -= riscv.F_OFFSET;
-            enc.add4(RiscV.s_type(op, 0b011, riscv.RSP, src, off));
-            return;
-        }
-        if( src >= riscv.MAX_REG ) {
-            // Load from SP
-            int off = fun(enc).computeStackOffset(enc._code,src);
-            int op = dstX ? RiscV.OP_LOADFP : RiscV.OP_LOAD;
-            if( dstX ) dst -= riscv.F_OFFSET;
-            enc.add4(RiscV.i_type(op, dst, 0b011, riscv.RSP, off));
-            return;
-        }
-        // pick opcode based on regs
-        if( !dstX && !srcX ) {
-            // GPR->GPR
-            enc.add4(RiscV.r_type(RiscV.OP,dst,0,src,riscv.ZERO,0));
-        } else if( dstX && srcX ) {
-            // FPR->FPR
-            src -= riscv.F_OFFSET;
-            dst -= riscv.F_OFFSET;
-            enc.add4(RiscV.r_type(RiscV.OP_FP, dst, 0b000, src, src, 0b0010101)); // dst = FMIN(src,src)
-        } else if(!srcX && dstX) {
-            //GPR->FPR
-            // fmv.d.x
-            enc.add4(RiscV.r_type(RiscV.OP_FP, dst - riscv.F_OFFSET, 0, src, 0, 0b1111001));
-        } else if(srcX && !dstX) {
-            //FPR->GPR
-            //fmv.x.d
-            enc.add4(RiscV.r_type(RiscV.OP_FP, dst, 0, src - riscv.F_OFFSET, 0, 0b1110001));
-        }
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SraIRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SraIRISC.java
deleted file mode 100644
index b316b303..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SraIRISC.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.Utils;
-
-public class SraIRISC extends ImmRISC {
-    public SraIRISC( Node and, int imm) {
-        super(and,imm | (0x20 << 5));
-    }
-    @Override int opcode() {  return RiscV.OP_IMM; }
-    @Override int func3() {  return 5;}
-    @Override public String glabel() { return ">>"; }
-    @Override public String op() { return "srai"; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SraRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SraRISC.java
deleted file mode 100644
index e2e34415..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SraRISC.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// Right Shift Arithmetic
-public class SraRISC extends MachConcreteNode implements MachNode {
-    public SraRISC(Node sra) { super(sra); }
-    @Override public String op() { return "sar"; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.r_type(enc,this,0b101,0b00100000);  }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" >> ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SrlIRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SrlIRISC.java
deleted file mode 100644
index d0ea6b18..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SrlIRISC.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.Utils;
-
-public class SrlIRISC extends ImmRISC {
-    public SrlIRISC( Node and, int imm, boolean pop) { super(and,imm,pop); }
-    @Override int opcode() {  return RiscV.OP_IMM; }
-    @Override int func3() {  return 5; }
-    @Override public String glabel() { return ">>>"; }
-    @Override public String op() { return "srli"; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SrlRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SrlRISC.java
deleted file mode 100644
index 1eccc1c8..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SrlRISC.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// Right Shift Logical
-public class SrlRISC extends MachConcreteNode implements MachNode {
-    public SrlRISC(Node srli) { super(srli); }
-    @Override public String op() { return "shr"; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.r_type(enc,this,7,0);  }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" >>> ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/StoreRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/StoreRISC.java
deleted file mode 100644
index c3fcf4d3..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/StoreRISC.java
+++ /dev/null
@@ -1,56 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Store memory addressing on ARM
-// Support imm, reg(direct), or reg+off(indirect) addressing
-// Base = base - base pointer, offset is added to base
-// idx  = null
-// off  = off - offset added to base)
-// imm  = imm - immediate value to store
-// val  = Node of immediate value to store(null if its a constant immediate)
-
-//e.g s.cs[0] =  67; // C
-// base = s.cs, off = 4, imm = 67, val = null
-
-// sw rs2,offset(rs1)
-public class StoreRISC extends MemOpRISC {
-    StoreRISC( StoreNode st, Node base, int off, Node val ) { super(st, base, off, val); }
-    @Override public String op() { return "st"+_sz; }
-    @Override public RegMask regmap(int i) {
-        // 0 - ctrl
-        if( i==1 ) return null; // mem
-        if( i==2 ) return riscv.RMASK; // ptr
-        // 2 - index
-        if( i==4 ) return _bytes >= 4
-                       ? riscv.MEM_MASK   // Word/dword value in GPR or FPR
-                       : riscv.RMASK;     // Byte/short stores require a GPR
-        return null; // Anti-dependence
-    }
-    @Override public RegMask outregmap() { return null; }
-
-    @Override public void encoding( Encoding enc ) {
-        short val = enc.reg(val());
-        short ptr = enc.reg(ptr());
-        int op = val >= riscv.F_OFFSET ? RiscV.OP_STOREFP : RiscV.OP_STORE;
-        if( val >= riscv.F_OFFSET  ) val -= riscv.F_OFFSET;
-        enc.add4(RiscV.s_type(op, func3()&7, ptr, val == -1 ? riscv.ZERO : val, _off));
-    }
-
-    // func3 is based on load/store size and extend
-    @Override int func3() {
-        return Integer.numberOfTrailingZeros(_bytes);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        asm_address(code,sb).p(",");
-        if( val()==null ) sb.p("#").p("0");
-        else sb.p(code.reg(val()));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SubFRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SubFRISC.java
deleted file mode 100644
index 044820cf..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SubFRISC.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// fsub.d
-public class SubFRISC extends MachConcreteNode implements MachNode {
-    SubFRISC(Node subf) {super(subf);}
-    @Override public String op() { return "subf"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return riscv.FMASK; }
-    @Override public RegMask outregmap() { return riscv.FMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.rf_type(enc,this,RiscV.RM.RNE,5); }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" + ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SubRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SubRISC.java
deleted file mode 100644
index 2adfce23..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/SubRISC.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class SubRISC extends MachConcreteNode implements MachNode {
-    public SubRISC( Node sub ) { super(sub); }
-    @Override public String op() { return "sub"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.r_type(enc,this,0,0x20);  }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" - ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/TFPRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/TFPRISC.java
deleted file mode 100644
index 44ef1a95..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/TFPRISC.java
+++ /dev/null
@@ -1,56 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeFunPtr;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class TFPRISC extends FunPtrNode implements MachNode, RIPRelSize {
-    final String _ext;
-    // Pointer to a Simple function
-    TFPRISC( FunPtrNode fptr ) { super(fptr); _ext = null; }
-    // Pointer to an Extern "C" function
-    TFPRISC( TypeFunPtr fptr, String ext ) { super(fptr,CodeGen.CODE._start,null); _type = fptr; _ext = ext; }
-    @Override public String op() { return "ldx"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public TFPRISC copy() { return new TFPRISC((TypeFunPtr)_con,_ext); }
-    @Override public void encoding( Encoding enc ) {
-        if( _ext==null ) enc.relo(this);          // Internal patch
-        else             enc.external(this,_ext); // ELF-file external patch
-        // TODO: 1 op encoding, plus a TODO if it does not fit
-        short dst = enc.reg(this);
-        // auipc  t0,0
-        enc.add4(RiscV.u_type(RiscV.OP_AUIPC, dst, 0));
-        // addi   t1,t0 + #0
-        enc.add4(RiscV.i_type(RiscV.OP_IMM, dst, 0, dst, 0));
-    }
-
-    @Override public byte encSize(int delta) { return 8; }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        short rpc = enc.reg(this);
-        if( opLen==8 ) {
-            int hi20 = (delta + 0x800) >> 12;
-            int lo12 = delta - (hi20 << 12);
-            // AUIPC (upper 20 bits)
-            // opstart of add
-            enc.patch4(opStart  ,RiscV.u_type(RiscV.OP_AUIPC, rpc, hi20));
-            // addi(low 12 bits)
-            enc.patch4(opStart+4,RiscV.i_type(RiscV.OP_IMM, rpc, 0, rpc, lo12 & 0xFFF));
-            // addi
-        } else {
-             // should not happen as one instruction is 4 byte, and TFP arm encodes 2.
-            throw Utils.TODO();
-        }
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        _type.print(sb.p(code.reg(this)).p(" #"));
-    }
-    @Override public boolean eq(Node n) { return this==n; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/TMPRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/TMPRISC.java
deleted file mode 100644
index a5ff3753..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/TMPRISC.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.ConstantNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.type.TypeMemPtr;
-import com.seaofnodes.simple.util.SB;
-
-public class TMPRISC extends ConstantNode implements MachNode, RIPRelSize {
-    final String _ext;
-    TMPRISC( ConstantNode con, String ext ) { super(con); _ext = ext; }
-    @Override public String op() { return "ldp"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public TMPRISC copy() { return new TMPRISC(this,_ext); }
-    @Override public void encoding( Encoding enc ) {
-        if( _ext!=null ) enc.externalData(this,_ext);
-        else enc.largeConstant(this,((TypeMemPtr)_con)._obj,0,-1);
-        short dst = enc.reg(this);
-        // AUIPC dst,#hi20_constant_pool
-        enc.add4(RiscV.u_type(RiscV.OP_AUIPC, dst, 0));
-        // addi dst,[dst+#low12_constant_pool]
-        enc.add4(RiscV.i_type(RiscV.OP_IMM, dst, 0, dst, 0));
-    }
-
-    @Override public byte encSize(int delta) { return 8; }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        short dst = enc.reg(this);
-        // AUIPC dst,#hi20_constant_pool
-        enc.patch4(opStart  , RiscV.u_type(RiscV.OP_AUIPC, dst, (delta+0x800)>>12));
-        // ADDI's low 12 bits are signed; round the AUIPC page accordingly.
-        enc.patch4(opStart+4, RiscV.i_type(RiscV.OP_IMM, dst, 0, dst, delta & 0xFFF));
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        _con.print(sb.p(code.reg(this)).p(" #"));
-    }
-    @Override public boolean eq(Node n) { return this==n; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/UJmpRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/UJmpRISC.java
deleted file mode 100644
index 448d9ec3..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/UJmpRISC.java
+++ /dev/null
@@ -1,49 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// unconditional jump
-public class UJmpRISC extends CFGNode implements MachNode, RIPRelSize {
-    @Override public String op() { return "jmp"; }
-    @Override public String label() { return op(); }
-    @Override protected ExprPrinter<Node> _print1(ExprPrinter<Node> p) { return p.p("jmp "); }
-    @Override public RegMask regmap(int i) {return null; }
-    @Override public RegMask outregmap() { return null; }
-    @Override public Type compute() { throw Utils.TODO(); }
-    @Override public Node idealize() { throw Utils.TODO(); }
-    @Override public void encoding( Encoding enc ) {
-        // Short form +/-4K:  beq r0,r0,imm12
-        // Long form:  auipc rX,imm20/32; jal r0,[rX+imm12/32]
-        enc.jump(this,uctrl());
-        enc.add4(RiscV.j_type(RiscV.OP_JAL, 0, 0));
-    }
-
-    // Delta is from opcode start
-    @Override public byte encSize(int delta) {
-        if( -(1L<<20) <= delta && delta < (1L<<20) ) return 4;
-        // 2 word encoding needs a tmp register, must teach RA
-        throw Utils.TODO();
-    }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        if( opLen==4 ) {
-            enc.patch4(opStart,RiscV.j_type(RiscV.OP_JAL, 0, delta));
-        } else {
-            throw Utils.TODO();
-        }
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        CFGNode target = uctrl();
-        //assert target.nOuts() > 1; // Should optimize jmp to empty targets
-        sb.p(label(target));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/XorIRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/XorIRISC.java
deleted file mode 100644
index f4323cae..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/XorIRISC.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.Utils;
-
-public class XorIRISC extends ImmRISC {
-    public XorIRISC( Node and, int imm) { super(and,imm); }
-    public XorIRISC( Node and, int imm, boolean pop) { super(and,imm,pop); }
-    @Override int opcode() {  return RiscV.OP_IMM; }
-    @Override int func3() {  return 4; }
-    @Override public String glabel() { return "^"; }
-    @Override public String op() { return "xori"; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/XorRISC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/XorRISC.java
deleted file mode 100644
index 413a7c3b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/XorRISC.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class XorRISC extends MachConcreteNode implements MachNode {
-    public XorRISC(Node or) { super(or); }
-    @Override public String op() { return "xor"; }
-    @Override public RegMask regmap(int i) { return riscv.RMASK; }
-    @Override public RegMask outregmap() { return riscv.WMASK; }
-    @Override public void encoding( Encoding enc ) { riscv.r_type(enc,this,4,0);  }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" ^ ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/riscv.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/riscv.java
deleted file mode 100644
index 0195542c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/riscv/riscv.java
+++ /dev/null
@@ -1,450 +0,0 @@
-package com.seaofnodes.simple.node.cpus.riscv;
-
-import com.seaofnodes.isa.RiscV;
-import static com.seaofnodes.isa.RiscV.*;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-
-public class riscv extends Machine {
-
-    public riscv(CodeGen code) {
-        if( !"SystemV".equals(code._callingConv) )
-            throw new IllegalArgumentException("Unknown calling convention "+code._callingConv);
-    }
-
-    @Override public String name() {return "riscv";}
-
-    // Using ABI names instead of register names
-    public static int ZERO =  0,  RPC=  1,  RSP=  2,  S12=  3,  S13=  4,  T0 =  5,  T1 =  6,  T2 =  7;
-    public static int S0   =  8,  S1 =  9,  A0 = 10,  A1 = 11,  A2 = 12,  A3 = 13,  A4 = 14,  A5 = 15;
-    public static int A6   = 16,  A7 = 17,  S2 = 18,  S3 = 19,  S4 = 20,  S5 = 21,  S6 = 22,  S7 = 23;
-    public static int S8   = 24,  S9 = 25,  S10= 26,  S11= 27,  T3 = 28,  T4 = 29,  T5 = 30,  T6 = 31;
-
-    // FP registers
-    public static int F0   = 32,  F1  = 33,  F2  = 34,  F3  = 35,  F4  = 36,  F5  = 37,  F6  = 38,  F7   = 39;
-    public static int FS0  = 40,  FS1 = 41,  FA0 = 42,  FA1 = 43,  FA2 = 44,  FA3 = 45,  FA4 = 46,  FA5  = 47;
-    public static int FA6  = 48,  FA7 = 49,  FS2 = 50,  FS3 = 51,  FS4 = 52,  FS5 = 53,  FS6 = 54,  FS7  = 55;
-    public static int FS8  = 56,  FS9 = 57,  FS10 = 58, FS11 = 59, FT8 = 60,  FT9 = 61,  FT10 = 62, FT11 = 63;
-
-    static final int MAX_REG = 64;
-
-    public static final int F_OFFSET = 32;
-
-    static final String[] REGS = new String[] {
-        //"zero","rpc"  , "rsp" , "s12" , "s13" , "t0"  , "t1"  , "t2"  ,
-        //"s0"  , "s1"  , "a0"  , "a1"  , "a2"  , "a3"  , "a4"  , "a5"  ,
-        //"a6"  , "a7"  , "s2"  , "s3"  , "s4"  , "s5"  , "s6"  , "s7"  ,
-        //"s8"  , "s9"  , "s10" , "s11" , "t3"  , "t4"  , "t5"  , "t6"  ,
-        //"f0"  , "f1"  , "f2"  , "f3"  , "f4"  , "f5"  , "f6"  , "f7"  ,
-        //"fs0" , "fs1" , "fa0" , "fa1" , "fa2" , "fa3" , "fa4" , "fa5" ,
-        //"fa6" , "fa7" , "fs2" , "fs3" , "fs4" , "fs5" , "fs6" , "fs7" ,
-        //"fs8" , "fs9" , "fs10", "fs11", "ft8" , "ft9" , "ft10", "ft11"
-        // Register-based naming hella easier to debug than "official" register
-        // names when single-stepping in debugger.
-        "zero", "r1"  , "rsp" , "r3" , "r4" , "r5" , "r6" , "r7" ,
-        "r8"  , "r9"  , "r10" , "r11", "r12", "r13", "r14", "r15",
-        "r16" , "r17" , "r18" , "r19", "r20", "r21", "r22", "r23",
-        "r24" , "r25" , "r26" , "r27", "r28", "r29", "r30", "r31",
-        "f0"  , "f1"  , "f2"  , "f3"  , "f4"  , "f5"  , "f6"  , "f7"  ,
-        "fs0" , "fs1" , "fa0" , "fa1" , "fa2" , "fa3" , "fa4" , "fa5" ,
-        "fa6" , "fa7" , "fs2" , "fs3" , "fs4" , "fs5" , "fs6" , "fs7" ,
-        "fs8" , "fs9" , "fs10", "fs11", "ft8" , "ft9" , "ft10", "ft11"
-    };
-    @Override public String[] regs() { return REGS; }
-
-    // General purpose register mask: pointers and ints, not floats
-    static final long RD_BITS = 0b11111111111111111111111111111111L; // All the GPRs
-    static final RegMask RMASK = new RegMask(RD_BITS);
-
-    static final long WR_BITS = 0b11111111111111111111111111111010L; // All the GPRs, minus ZERO and RSP
-    static final RegMask WMASK = new RegMask(WR_BITS);
-    // Float mask from(f0-ft10).  TODO: ft10,ft11 needs a larger RegMask
-    static final long FP_BITS = 0b11111111111111111111111111111111L<<F0;
-    static final RegMask FMASK = new RegMask(FP_BITS);
-
-    // Load/store mask; both GPR and FPR
-    static final RegMask MEM_MASK = new RegMask(WR_BITS | FP_BITS);
-
-    static final RegMask SPLIT_MASK = new RegMask( WR_BITS | FP_BITS, -1L );
-
-    // Arguments masks
-    public static RegMask A0_MASK = new RegMask(A0);
-    public static RegMask A1_MASK = new RegMask(A1);
-    public static RegMask A2_MASK = new RegMask(A2);
-    public static RegMask A3_MASK = new RegMask(A3);
-    public static RegMask A4_MASK = new RegMask(A4);
-    public static RegMask A5_MASK = new RegMask(A5);
-    public static RegMask A6_MASK = new RegMask(A6);
-    public static RegMask A7_MASK = new RegMask(A7);
-
-    public static final RegMask RPC_MASK = new RegMask(RPC);
-
-    // Float arguments masks
-    public static RegMask FA0_MASK = new RegMask(FA0);
-    public static RegMask FA1_MASK = new RegMask(FA1);
-    public static RegMask FA2_MASK = new RegMask(FA2);
-    public static RegMask FA3_MASK = new RegMask(FA3);
-    public static RegMask FA4_MASK = new RegMask(FA4);
-    public static RegMask FA5_MASK = new RegMask(FA5);
-    public static RegMask FA6_MASK = new RegMask(FA6);
-    public static RegMask FA7_MASK = new RegMask(FA7);
-
-    // Int/ptr arguments calling convention
-    static RegMask[] CALLINMASK = new RegMask[] {
-        A0_MASK,
-        A1_MASK,
-        A2_MASK,
-        A3_MASK,
-        A4_MASK,
-        A5_MASK,
-        A6_MASK,
-        A7_MASK
-    };
-
-    static RegMask[] XMMS = new RegMask[] {
-        FA0_MASK,
-        FA1_MASK,
-        FA2_MASK,
-        FA3_MASK,
-        FA4_MASK,
-        FA5_MASK,
-        FA6_MASK,
-        FA7_MASK
-    };
-
-    // Since riscv instructions are fixed we can just or them together
-
-    public static void r_type(Encoding enc, Node n, int func3, int func7) {
-        short dst  = enc.reg(n);
-        short src1 = enc.reg(n.in(1));
-        short src2 = enc.reg(n.in(2));
-        int body = RiscV.r_type(OP,dst,func3,src1,src2,func7);
-        enc.add4(body);
-    }
-
-    public static void rf_type(Encoding enc, Node n, RM func3, int func7) {
-        short dst  = (short)(enc.reg(n      )-F_OFFSET);
-        short src1 = (short)(enc.reg(n.in(1))-F_OFFSET);
-        short src2 = (short)(enc.reg(n.in(2))-F_OFFSET);
-        int body = RiscV.r_type(OP_FP,dst,func3.ordinal(),src1,src2,func7);
-        enc.add4(body);
-    }
-
-    @Override public RegMask callArgMask( TypeFunPtr tfp, int idx, int maxArgSlot ) { return callInMask(tfp,idx,maxArgSlot); }
-    static RegMask callInMask( TypeFunPtr tfp, int idx, int maxArgSlot ) {
-        if( idx==0 ) return RPC_MASK;
-        if( idx==1 ) return null;
-        if( idx-2 >= tfp.nargs() ) return null; // Anti-dependence
-        boolean hidden = hiddenSelf(tfp);
-        int sigidx = idx-2;
-        if( hidden ) {
-            if( sigidx==0 ) return null;
-            sigidx--;
-        }
-        // Count floats in signature up to index
-        int fcnt=0;
-        for( int i=hidden ? 1 : 0; i<idx-2; i++ )
-            if( tfp.arg(i) instanceof TypeFloat )
-                fcnt++;
-        // Floats up to XMMS in XMM registers
-        if( tfp.arg(idx-2) instanceof TypeFloat ) {
-            if( fcnt < XMMS.length )
-                return XMMS[fcnt];
-        } else {
-            RegMask[] cargs = CALLINMASK;
-            if( sigidx-fcnt < cargs.length )
-                return cargs[sigidx-fcnt];
-        }
-        // Pass on stack slot(8 and higher)
-        if( maxArgSlot>0 ) throw Utils.TODO();
-        return new RegMask(MAX_REG + 1 + sigidx);
-    }
-
-    @Override public short maxArgSlot( TypeFunPtr tfp ) {
-        int icnt=0, fcnt=0;     // Count of ints, floats
-        for( int i=hiddenSelf(tfp) ? 1 : 0; i<tfp.nargs(); i++ ) {
-            if( tfp.arg(i) instanceof TypeFloat ) fcnt++;
-            else icnt++;
-        }
-        int nstk = Math.max(icnt-8,0)+Math.max(fcnt-8,0);
-        return (short)nstk;
-    }
-    private static boolean hiddenSelf(TypeFunPtr tfp) {
-        return tfp.nargs() > 0 && tfp.arg(0) == TypePtr.PTR;
-    }
-
-    static final long CALLER_SAVE =
-        (1L<<RPC) |
-        (1L<<A0 ) | (1L<<A1 ) | (1L<<A2 ) | (1L<<A3 ) | (1L<<A4 ) | (1L<<A5 ) | (1L<<A6 ) | (1L<<A7 ) |
-        (1L<<T0 ) | (1L<<T1 ) | (1L<<T2 ) | (1L<<T3 ) | (1L<<T4 ) | (1L<<T5 ) | (1L<<T6 ) |
-        (1L<<FA0) | (1L<<FA1) | (1L<<FA2) | (1L<<FA3) | (1L<<FA4) | (1L<<FA5) | (1L<<FA6) | (1L<<FA7) |
-        (1L<<F0 ) | (1L<<F1 ) | (1L<<F2 ) | (1L<<F3 ) | (1L<<F4 ) | (1L<<F5 ) | (1L<<F6 ) | (1L<<F7 ) |
-        (1L<<FT8) | (1L<<FT9) | (1L<<FT10)| (1L<<FT11);
-
-    @Override public long callerSave() { return CALLER_SAVE; }
-    @Override public long  neverSave() { return (1L<<RSP) | (1L<<ZERO); }
-    @Override public RegMask retMask( TypeFunPtr tfp ) {
-        return tfp.ret() instanceof TypeFloat ? FA0_MASK : A0_MASK;
-    }
-    @Override public int rpc() { return RPC; }
-
-    // Return a MachNode unconditional branch
-    @Override public CFGNode jump() { return new UJmpRISC(); }
-
-    // Create a split op; any register to any register, including stack slots
-    @Override public SplitNode split(LRG lrg, String kind, byte round ) { return new SplitRISC(lrg, kind,round);  }
-
-    // True if signed 12-bit immediate
-    public static boolean imm12(TypeInteger ti) {
-        // 52 = 64-12
-        return ti.isConstant() && ((ti.value()<<52)>>52) == ti.value();
-    }
-    // True if HIGH 20-bit signed immediate, with all zeros low.
-    public static boolean imm20Exact(TypeInteger ti) {
-        // shift left 32 to clear out the upper 32 bits.
-        // shift right SIGNED to sign-extend upper 32 bits; then shift 12 more to clear out lower 12 bits.
-        // shift left 12 to re-center the bits.
-        return ti.isConstant() && (((ti.value()<<32)>>44)<<12) == ti.value();
-    }
-
-    @Override public Node instSelect( Node n ) {
-        return switch (n) {
-        case AddNode      add -> add(add);
-        case AndNode      and -> and(and);
-        case BoolNode    bool -> cmp(bool);
-        case CallNode    call -> call(call);
-        case PtrToIntNode  ptr -> new PtrToIntMach(ptr);
-        case GuardNode guard  -> new GuardMach(guard);
-        case CallEndNode cend -> new CallEndMach(cend);
-        case CLInitNode init -> new CLInitNode(init);
-        case CProjNode      c -> new CProjNode(c);
-        case ConstantNode con -> con(con);
-        case DivNode      div -> div.mode()==2 ? new DivFRISC(div) : new DivRISC(div);
-        case EscapeNode   esc -> new EscapeNode(esc);
-        case FunNode      fun -> new FunRISC(fun);
-        case FunPtrNode  fptr -> fptr(fptr);
-        case IfNode       iff -> jmp(iff);
-        case LoadNode      ld -> ld(ld);
-        case MemMergeNode mem -> new MemMergeNode(mem);
-        case MinusNode    neg -> {
-            if( neg.mode()==2 ) throw Utils.TODO();
-            yield new NegRISC(neg);
-        }
-        case MulNode      mul -> mul.mode()==2 ? new MulFRISC(mul) : new MulRISC(mul);
-        case NewNode      nnn -> nnn(nnn);
-        case NotNode      not -> new NotRISC(not);
-        case OrNode        or -> or(or);
-        case ParmNode    parm -> new ParmRISC(parm);
-        case BulkMemPhiNode phi-> new BulkMemPhiNode(phi);
-        case MemPhiNode  phi  -> new MemPhiNode(phi);
-        case PhiNode      phi -> new PhiNode(phi);
-        case ProjNode     prj -> prj(prj);
-        case ReadOnlyNode read-> new ReadOnlyMach(read);
-        case ReturnNode   ret -> new RetRISC(ret, ret.fun());
-        case SarNode      sar -> sra(sar);
-        case ShlNode      shl -> sll(shl);
-        case ShrNode      shr -> srl(shr);
-        case StartCUNode start -> new StartCUNode(start);
-        case StopCUNode  stop -> new StopCUNode(stop);
-        case StartNode  start -> new StartNode(start);
-        case StopNode    stop -> new StopNode(stop);
-        case StoreNode     st -> st(st);
-        case SubNode      sub -> sub.mode()==2 ? new SubFRISC(sub) : sub(sub);
-        case ToFloatNode  tfn -> i2f8(tfn);
-        case ToIntegerNode cvt -> new F8ToIRISC(cvt);
-        case XorNode      xor -> xor(xor);
-
-        case LoopNode loop -> new LoopNode(loop);
-        case RegionNode region -> new RegionNode(region);
-        default -> throw Utils.TODO();
-        };
-    }
-
-    private Node add(AddNode add) {
-        if( add.mode()==2 )
-            return new AddFRISC(add);
-        if( add.in(2) instanceof ConstantNode off2 && off2._con instanceof TypeInteger ti && imm12(ti) )
-            return new AddIRISC(add, (int)ti.value(),true);
-        return new AddRISC(add);
-    }
-
-    private Node and(AndNode and) {
-        if( and.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti ) {
-            if( imm12(ti) )
-                return new AndIRISC(and, (int)ti.value());
-            // Could be any size low bit mask
-            if( ti.value() == 0xFFFFFFFFL )
-                return new SrlIRISC(new SllIRISC(and,32),32,false);
-        }
-        return new AndRISC(and);
-    }
-
-    private Node call(CallNode call) {
-        return call.fptr() instanceof FunPtrNode fptr
-            ? new CallRISC(call, (TypeFunPtr)fptr._type)
-            : call.fptr() instanceof ConstantNode con
-            ? new CallRISC(call, (TypeFunPtr)con._type)
-            : new CallRRISC(call);
-    }
-    private Node nnn(NewNode nnn) {
-        // TODO: pass in the TFP for alloc
-        return new NewRISC(nnn);
-    }
-
-    private Node cmp(BoolNode bool) {
-        // Float variant directly implemented in hardware
-        if( bool.isFloat() )
-            return new SetFRISC(bool);
-
-        // Only < and <u are implemented in hardware.
-        // x <  y - as-is
-        // x <= y - flip and negate; !(y < x); `slt tmp=y,x; xori dst=tmp,#1`
-        // x == y - sub and vs0 == `sub tmp=x-y; sltu dst=tmp,#1`
-
-        // x >  y - swap; y < x
-        // x >= y - swap and negate; !(x < y); `slt tmp=y,x;` then NOT.
-        // x != y - sub and vs0 == `sub tmp=x-y; sltu dst=tmp,#1` then NOT.
-
-        // The ">", ">=" and "!=" in Simple include a NotNode, which can be
-        // implemented with a XOR.  If one of the above is followed by a NOT
-        // we can remove the double XOR in the encodings.
-
-        return switch( bool.op() ) {
-        case "<" -> bool.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm12(ti)
-            ? new SetIRISC(bool, (int)ti.value(),false)
-            : new  SetRISC(bool, false);
-        // x <= y - flip and negate; !(y < x); `slt tmp=y,x; xori dst=tmp,#1`
-        case "<=" -> new XorIRISC(new SetRISC(bool.swap12(), false),1,false);
-        // x == y - sub and vs0 == `sub tmp=x-y; sltu dst=tmp,#1`
-        case "==" -> new SetIRISC(new SubRISC(bool),1,true,false);
-        default -> throw Utils.TODO();
-        };
-    }
-
-    private Node con( ConstantNode con ) {
-        if( !con._con.isConstant() )
-            return ConstantNode.raw(con); // Default unknown caller inputs
-        String ext = con instanceof ExternNode ext0 ? ext0._extern : null;
-        return switch( con._con ) {
-        case TypeInteger ti -> {
-            // External; without knowing the size assume we have to load something
-            if( ext!=null ) yield new Int8RISC(con,ext);
-            if( imm12(ti) ) yield new IntRISC(con);
-            long x = ti.value();
-            if( imm20Exact(ti) ) yield new LUI((int)x);
-            if( (x<<32)>>32 == x ) { // Signed lower 32-bit immediate
-                // Here, the low 12 bits get sign-extended, which means if
-                // bit11 is set, the value is negative and lowers the LUI
-                // value.  Add a bit 12 to compensate
-                if( ((x>>11)&1)==1 ) x += 0x1000;
-                yield new AddIRISC(new LUI((int)(x & ~0xFFF)), (int)(x & 0xFFF),false);
-            }
-            // Need more complex sequence for larger constants... or a load
-            // from a constant pool, which does not need an extra register
-            yield new Int8RISC(con,null);
-        }
-        // Load from constant pool
-        case TypeFloat   tf  -> new FltRISC(con,ext);
-        case TypeMemPtr  tmp -> new TMPRISC(con,ext);
-        case TypeFunPtr  tfp -> new TFPRISC(tfp,ext);
-        case TypeNil     tn  -> throw Utils.TODO();
-        // TOP, BOTTOM, XCtrl, Ctrl, etc.  Never any executable code.
-        case Type t -> t==Type.NIL ? new IntRISC(con) : ConstantNode.raw(con);
-        };
-    }
-
-    private Node fptr( FunPtrNode con ) {
-        return new TFPRISC(con);
-    }
-
-    private Node jmp( IfNode iff ) {
-        if( iff.in(1) instanceof BoolNode bool && !bool.isFloat() ) {
-            // if less than or equal switch inputs
-            String bop = bool.op();
-            if( bop.equals("<=") || bop.equals(">") )
-                return new BranchRISC(iff, IfNode.swap(bop), bool.in(2), bool.in(1));
-            return new BranchRISC(iff, bop, bool.in(1), bool.in(2));
-        }
-        // Vs zero
-        return new BranchRISC(iff, iff.in(1)==null ? "==" : "!=", iff.in(1), null);
-    }
-
-    private Node or(OrNode or) {
-        if( or.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm12(ti))
-            return new OrIRISC(or, (int)ti.value());
-        return new OrRISC(or);
-    }
-
-    private Node xor(XorNode xor) {
-        if( xor.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm12(ti))
-            return new XorIRISC(xor, (int)ti.value());
-        return new XorRISC(xor);
-    }
-
-    private Node sra(SarNode sar) {
-        if( sar.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm12(ti))
-            return new SraIRISC(sar, (int)ti.value());
-        return new SraRISC(sar);
-    }
-
-    private Node srl(ShrNode shr) {
-        if( shr.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm12(ti))
-            return new SrlIRISC(shr, (int)ti.value(),true);
-        return new SrlRISC(shr);
-    }
-
-    private Node sll(ShlNode sll) {
-        if( sll.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm12(ti))
-            return new SllIRISC(sll, (int)ti.value());
-        return new SllRISC(sll);
-    }
-
-    private Node sub(SubNode sub) {
-        return sub.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm12(ti)
-            ? new AddIRISC(sub, (int)(-ti.value()),true)
-            : new SubRISC(sub);
-    }
-
-    private Node i2f8(ToFloatNode tfn) {
-        assert tfn.in(1)._type instanceof TypeInteger ti;
-        return new I2F8RISC(tfn);
-    }
-
-    private Node prj(ProjNode prj) {
-        if( prj.in(0) instanceof CLInitNode ) return new ProjNode(prj);
-        TypeInteger ret = cReturn(prj);
-        if( ret!=null ) return new ExtendRISC(prj,ret);
-        return prj.in(0) instanceof StartNode ? new ProjNode(prj) : new ProjRISC(prj);
-    }
-
-    private Node ld(LoadNode ld) {
-        return new LoadRISC(ld,address(ld),off);
-    }
-
-    private Node st(StoreNode st) {
-        Node xval = st.val() instanceof ConstantNode con && con._con == TypeInteger.ZERO ? null : st.val();
-        return new StoreRISC(st,address(st), off, xval);
-    }
-
-    // Gather addressing mode bits prior to constructing.  This is a builder
-    // pattern, but saving the bits in a *local* *global* here to keep mess
-    // contained.
-    private static int off;
-    private Node address( MemOpNode mop ) {
-        off = 0;  // Reset
-        Node base = mop.ptr();
-        // Skip/throw-away a ReadOnly, only used to typecheck
-        if( base instanceof ReadOnlyNode read ) base = read.in(1);
-        assert !(base instanceof AddNode) && base._type instanceof TypeMemPtr; // Base ptr always, not some derived
-        if( mop.off() instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm12(ti) ) {
-            off = (int)ti.value();
-        } else {
-            base = new AddRISC(base,mop.off());
-            base._type = mop.ptr()._type;
-        }
-        return base;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddFMemX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddFMemX86.java
deleted file mode 100644
index 74af9266..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddFMemX86.java
+++ /dev/null
@@ -1,33 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class AddFMemX86 extends MemOpX86 {
-    AddFMemX86( AddNode add, LoadNode ld , Node base, Node idx, int off, int scale, Node val ) {
-        super(add,ld, base, idx, off, scale, 0, val );
-    }
-    @Override public String op() { return "addf"+_sz; }
-    @Override public RegMask regmap(int i) {
-        if( i==1 ) return null;            // Memory
-        if( i==2 ) return x86_64_v2.RMASK; // base
-        if( i==3 ) return x86_64_v2.RMASK; // index
-        if( i==4 ) return x86_64_v2.XMASK; // value
-        throw Utils.TODO();
-    }
-    @Override public RegMask outregmap() { return x86_64_v2.XMASK; }
-    @Override public int twoAddress() { return 4; }
-    @Override public void encoding( Encoding enc ) {
-        X86.memory(enc,0xF2,0x0F58,false,enc.reg(this)-x86_64_v2.XMM_OFFSET,enc.reg(ptr()),enc.reg(idx()),_off,_scale);
-    }
-
-    // General form: "add  dst = src + [base + idx<<2 + 12]"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ");
-        sb.p(val()==null ? "#"+_imm : code.reg(val())).p(" + ");
-        asm_address(code,sb);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddFX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddFX86.java
deleted file mode 100644
index c7d0cf9c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddFX86.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class AddFX86 extends MachConcreteNode implements MachNode {
-    AddFX86( Node addf ) { super(addf); }
-    @Override public String op() { return "addf"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return x86_64_v2.XMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.XMASK; }
-    @Override public int twoAddress() { return 1; }
-    @Override public boolean commutes() { return true; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.sse(enc,0xF2,0x0F58,false,enc.reg(this)-x86_64_v2.XMM_OFFSET,enc.reg(in(2))-x86_64_v2.XMM_OFFSET);
-    }
-
-    // General form: "addf  dst += src"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" += ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddIX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddIX86.java
deleted file mode 100644
index 0e652a93..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddIX86.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class AddIX86 extends ImmX86 {
-    AddIX86( Node add, int imm ) { super(add,imm); }
-    @Override public String op() {
-        return _imm == 1  ? "inc" : (_imm == -1 ? "dec" : "addi");
-    }
-    @Override public String glabel() { return "+"; }
-    @Override int opcode() { return 0x81; }
-    @Override int mod() { return 0; }
-    @Override public final void encoding( Encoding enc ) {
-        if( _imm== 1 || _imm== -1 ) {
-            short dst = enc.reg(this); // Also src1
-            X86.unary(enc,0xFF,_imm==1 ? 0 : 1,dst);
-        } else super.encoding(enc);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddMemX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddMemX86.java
deleted file mode 100644
index ed65b0a8..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddMemX86.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class AddMemX86 extends MemOpX86 {
-    AddMemX86( AddNode add, LoadNode ld , Node base, Node idx, int off, int scale, int imm, Node val ) {
-        super(add,ld, base, idx, off, scale, imm, val );
-    }
-    @Override public String op() { return "add"+_sz; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    @Override public int twoAddress() { return 4; }
-    @Override public void encoding( Encoding enc ) {
-        X86.memory(enc,0,0x03,true,enc.reg(this),enc.reg(ptr()),enc.reg(idx()),_off,_scale);
-    }
-
-    // General form: "add  dst += [base + idx<<2 + 12]"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" += ");
-        asm_address(code,sb);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddX86.java
deleted file mode 100644
index 84543e8f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AddX86.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.node.Node;
-
-public class AddX86 extends RegX86 {
-    AddX86( Node add ) { super(add); }
-    @Override public String op() { return "add"; }
-    @Override public String glabel() { return "+"; }
-    @Override int opcode() { return 0x03; }
-    @Override public boolean commutes() { return true; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AndIX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AndIX86.java
deleted file mode 100644
index 3c1b567c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AndIX86.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.node.Node;
-
-public class AndIX86 extends ImmX86 {
-    AndIX86( Node add, int imm ) { super(add,imm); }
-    @Override public String op() { return "andi"; }
-    @Override public String glabel() { return "&"; }
-    @Override int opcode() { return 0x81; }
-    @Override int mod() { return 4; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AndX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AndX86.java
deleted file mode 100644
index dedbce45..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/AndX86.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.node.Node;
-
-public class AndX86 extends RegX86 {
-    AndX86( Node add ) { super(add); }
-    @Override public String op() { return "and"; }
-    @Override public String glabel() { return "&"; }
-    @Override int opcode() { return 0x23; }
-    @Override public boolean commutes() { return true; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CallRX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CallRX86.java
deleted file mode 100644
index f97163eb..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CallRX86.java
+++ /dev/null
@@ -1,30 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.CallNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.util.SB;
-
-public class CallRX86 extends CallNode implements MachNode {
-    CallRX86( CallNode call ) { super(call); }
-    @Override public String op() { return "callr"; }
-    @Override public String label() { return op(); }
-    @Override public RegMask regmap(int i) {
-        return i==_inputs._len
-            ? x86_64_v2.WMASK          // Function call target
-            : x86_64_v2.callInMask(tfp(),i,fun()._maxArgSlot); // Normal argument
-    }
-    @Override public RegMask outregmap() { return null; }
-    @Override public void encoding( Encoding enc ) {
-        X86.callRegister(enc,enc.reg(fptr()));
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(fptr())).p("  ");
-        for( int i=0; i<nargs(); i++ )
-            sb.p(code.reg(arg(i))).p("  ");
-        sb.unchar(2);
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CallX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CallX86.java
deleted file mode 100644
index 6bafbf37..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CallX86.java
+++ /dev/null
@@ -1,55 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeFunPtr;
-import com.seaofnodes.simple.util.SB;
-
-public class CallX86 extends CallNode implements MachNode, RIPRelSize {
-    final TypeFunPtr _tfp;
-    final String _name;
-    final boolean _extern;
-    CallX86( CallNode call, TypeFunPtr tfp ) {
-        super(call);
-        _inputs.pop(); // Pop constant target
-        assert tfp.isConstant();
-        _tfp = tfp;
-        _name = CodeGen.CODE.funcName(tfp.fidx());
-        _extern = CodeGen.CODE.externFunc(tfp.fidx()) != null;
-    }
-    @Override public String op() { return "call"; }
-    @Override public String label() { return op(); }
-    @Override public String name() { return _name; }
-    @Override public TypeFunPtr tfp() { return _tfp; }
-    @Override public RegMask regmap(int i) {
-        return _extern
-            ? x86_64_v2.callInMask(_tfp,i,fun()._maxArgSlot,CodeGen.CODE._cCallingConv)
-            : x86_64_v2.callInMask(_tfp,i,fun()._maxArgSlot);
-    }
-    @Override public RegMask outregmap() { return null; }
-    @Override public int nargs() { return nIns()-2; } // Minus control, memory, fptr
-    @Override public boolean external() { return _extern; }
-
-    @Override public void encoding( Encoding enc ) {
-        FunNode fun = CodeGen.CODE.link(_tfp);
-        if( fun==null ) enc.external(this,_name);
-        else enc.relo(this);
-        X86.call(enc);
-    }
-
-    // Delta is from opcode start, but X86 measures from the end of the 5-byte encoding
-    @Override public byte encSize(int delta) { return 5; }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        enc.patch4(opStart+1, delta-5);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(_name).p("  ");
-        for( int i=0; i<nargs(); i++ )
-            sb.p(code.reg(in(i+2))).p(", ");
-        sb.unchar(2);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpFX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpFX86.java
deleted file mode 100644
index 5ef7a476..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpFX86.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class CmpFX86 extends MachConcreteNode implements MachNode {
-    CmpFX86( Node cmp ) { super(cmp); }
-    @Override public String op() { return "cmpf"; }
-    @Override public RegMask regmap(int i) { return x86_64_v2.XMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.FLAGS_MASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.sse(enc,0x66,0x0F2E,false,enc.reg(in(1))-x86_64_v2.XMM_OFFSET,enc.reg(in(2))-x86_64_v2.XMM_OFFSET);
-    }
-
-    // General form: "cmp src1,src2"
-    @Override public void asm(CodeGen code, SB sb) {
-        String dst = code.reg(this);
-        if( dst!="flags" )  sb.p(dst).p(" = ");
-        sb.p(code.reg(in(1))).p(", ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpIX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpIX86.java
deleted file mode 100644
index 151f8ca8..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpIX86.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-// Compare immediate.  Sets flags.
-public class CmpIX86 extends MachConcreteNode implements MachNode {
-    final int _imm;
-    CmpIX86( Node cmp, int imm, boolean swap ) {
-        super(cmp);
-        _inputs.del(swap ? 1 : 2);
-        _imm = imm;
-    }
-    CmpIX86( CmpIX86 cmp ) {
-        super((Node)null);
-        addDef(null);
-        addDef(cmp.in(1));
-        _imm = cmp._imm;
-    }
-
-    @Override public String op() { return _imm==0 ? "test" : "cmp"; }
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.FLAGS_MASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public Node copy() { return new CmpIX86(this); }
-
-    @Override public final void encoding( Encoding enc ) {
-        X86.imm(enc,0x81,7,enc.reg(in(1)),_imm);
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        String dst = code.reg(this);
-        if( dst!="flags" )  sb.p(dst).p(" = ");
-        sb.p(code.reg(in(1)));
-        if( _imm != 0 ) sb.p(", #").p(_imm);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpMemX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpMemX86.java
deleted file mode 100644
index 4014045b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpMemX86.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeFloat;
-import com.seaofnodes.simple.util.SB;
-
-public class CmpMemX86 extends MemOpX86 {
-    final boolean _swap;      // Op switched LHS, RHS
-    CmpMemX86( BoolNode bool, LoadNode ld, Node base, Node idx, int off, int scale, int imm, Node val, boolean swap ) {
-        super(bool,ld, base, idx, off, scale, imm, val );
-        _swap = swap;
-        assert !_swap || val() != null || bool.op()=="==" || bool.op()=="!="; // Cannot swap with immediate
-    }
-    @Override public String op() { return ((val()==null && _imm==0) ? "test" : "cmp") + _sz; }
-    @Override public RegMask outregmap() { return x86_64_v2.FLAGS_MASK; }
-    @Override public void encoding( Encoding enc ) {
-        short ptr=enc.reg(ptr()), idx=enc.reg(idx()), src=enc.reg(val());
-        if( src==-1 ) {
-            assert !_swap;
-            X86.cmpImm(enc,_con.log_size(),_imm,ptr,idx,_off,_scale);
-        } else encVal(enc,_con,ptr,idx,src,_off,_scale,_swap);
-    }
-
-    static void encVal(Encoding enc, Type decl, short ptr, short idx, short src, int off, int scale, boolean _swap) {
-        assert !(decl instanceof TypeFloat); // Selected separately as CmpFX86.
-        X86.cmpMem(enc,decl.log_size(),src,ptr,idx,off,scale,_swap);
-    }
-
-    // General form: "cmp  dst = src, [base + idx<<2 + 12]"
-    @Override public void asm(CodeGen code, SB sb) {
-        String dst = code.reg(this);
-        if( dst!="flags" )  sb.p(dst).p(" = ");
-        if( _swap ) asm_address(code,sb).p(",");
-        if( val()==null ) {
-            if( _imm!=0 )  sb.p("#").p(_imm);
-        } else {
-            sb.p(code.reg(val()));
-        }
-        if( !_swap ) asm_address(code,sb.p(", "));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpX86.java
deleted file mode 100644
index 7faea17b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/CmpX86.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class CmpX86 extends MachConcreteNode implements MachNode {
-    CmpX86( Node add ) { super(add); }
-    @Override public String op() { return "cmp"; }
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.FLAGS_MASK; }
-    // This one is marginal: cloning a Cmp[reg,reg] means stretching the
-    // lifetimes of 2 normal registers in exchange for shortening a flags
-    // register lifetime.  Spilling flags is (probably) relatively expensive
-    // compared to some normal registers - and those normal registers might not
-    // be spilling!
-    @Override public boolean isClone() { return true; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.reg(enc,0x3B,enc.reg(in(1)),enc.reg(in(2)));
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        String dst = code.reg(this);
-        if( dst!="flags" )  sb.p(dst).p(" = ");
-        sb.p(code.reg(in(1))).p(", ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/DivFX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/DivFX86.java
deleted file mode 100644
index 7bbb5102..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/DivFX86.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class DivFX86 extends MachConcreteNode implements MachNode {
-    DivFX86( Node divf) { super(divf); }
-    @Override public String op() { return "divf"; }
-    @Override public RegMask regmap(int i) { return x86_64_v2.XMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.XMASK; }
-    @Override public int twoAddress() { return 1; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.sse(enc,0xF2,0x0F5E,false,enc.reg(this)-x86_64_v2.XMM_OFFSET,enc.reg(in(2))-x86_64_v2.XMM_OFFSET);
-    }
-
-
-    // General form: "divf  dst /= src"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" /= ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/DivX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/DivX86.java
deleted file mode 100644
index 9f375a80..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/DivX86.java
+++ /dev/null
@@ -1,25 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class DivX86 extends MachConcreteNode implements MachNode {
-    DivX86( Node div ) { super(div); }
-    @Override public String op() { return "div"; }
-    @Override public RegMask regmap(int i) {
-        return (i==1) ? x86_64_v2.RAX_MASK : x86_64_v2.DIV_MASK;
-    }
-    @Override public RegMask outregmap() { return x86_64_v2.RAX_MASK; }
-    @Override public RegMask killmap() { return x86_64_v2.RDX_MASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.divide(enc,enc.reg(in(2)));
-    }
-    // General form: "div  dst /= src"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" / ").p(code.reg(in(2)));
-    }
-    @Override public String comment() { return "kill rdx"; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ExtendX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ExtendX86.java
deleted file mode 100644
index 1a6ae123..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ExtendX86.java
+++ /dev/null
@@ -1,29 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-
-// Convert a narrow C return register to Simple's full-width integer value.
-public class ExtendX86 extends MachConcreteNode {
-    final int _bits;
-    final boolean _signed;
-    ExtendX86(ProjNode prj, TypeInteger ret) {
-        super(prj);
-        _inputs.set(0,null);
-        _inputs.add(new ProjX86(prj));
-        _bits = 8 << ret.log_size();
-        _signed = ret._min < 0;
-    }
-    @Override public String op() { return (_signed ? "sext" : "zext")+_bits; }
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    @Override public void encoding(Encoding enc) {
-        X86.extend(enc,_bits,_signed,enc.reg(this),enc.reg(in(1)));
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/F8ToIX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/F8ToIX86.java
deleted file mode 100644
index a79a1017..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/F8ToIX86.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class F8ToIX86 extends MachConcreteNode implements MachNode {
-    F8ToIX86(Node f8toi ) { super(f8toi); }
-    @Override public String op() { return "cvti"; }
-    @Override public RegMask regmap(int i) { assert i==1; return x86_64_v2.XMASK; }
-    @Override public RegMask killmap() { return x86_64_v2.FLAGS_MASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.floatToInteger(enc,enc.reg(this),enc.reg(in(1))-x86_64_v2.XMM_OFFSET);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p("(int)").p(code.reg(in(1)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/FltX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/FltX86.java
deleted file mode 100644
index 59f06341..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/FltX86.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class FltX86 extends ConstantNode implements MachNode, RIPRelSize{
-    private byte _encSize;
-    final String _ext;
-    FltX86( ConstantNode con, String ext ) { super(con); _ext = ext; }
-    @Override public String op() { return "ld8"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return x86_64_v2.XMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public Node copy() { return new FltX86(this,_ext); }
-
-    @Override public void encoding( Encoding enc ) {
-        if( _ext!=null ) throw Utils.TODO();
-        _encSize=X86.rip(enc,0xF2,0x0F10,false,enc.reg(this)-x86_64_v2.XMM_OFFSET);
-        enc.largeConstant(this,_con,_encSize-4,2/*ELF PC32*/);
-    }
-
-    // Delta is from opcode start
-    @Override public byte encSize(int delta) {
-        // TODO: 1-byte RIP offset?
-        return (byte)_encSize;
-    }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        enc.patch4(opStart+opLen-4,delta-opLen);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        _con.print(sb.p(code.reg(this)).p(" = #"));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/FunX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/FunX86.java
deleted file mode 100644
index 0e44aee7..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/FunX86.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.node.FunNode;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.util.SB;
-
-public class FunX86 extends FunNode implements MachNode {
-    FunX86( FunNode fun ) { super(fun); }
-    @Override public void postSelect(CodeGen code) {
-        super.postSelect(code);
-        _maxArgSlot = code._mach.maxArgSlot(sig(),code._callingConv);
-        // One more for RPC pre-pushed; X86 special
-        _maxArgSlot++;
-    }
-
-    @Override public void computeFrameAdjust(CodeGen code, int maxReg) {
-        super.computeFrameAdjust(code,maxReg);
-        // Alignment, but off by RPC
-        if( _hasCalls )         // If non-leaf, pad to 16b
-            _frameAdjust = ((_frameAdjust+8+8) & -16)-8;
-    }
-
-    @Override public void encoding( Encoding enc ) {
-        int sz = _frameAdjust;
-        if( sz == 0 ) return; // Skip if no frame adjust
-        X86.imm(enc,0x81,5,x86_64_v2.RSP,sz);
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/I2f8X86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/I2f8X86.java
deleted file mode 100644
index ee357901..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/I2f8X86.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class I2f8X86 extends MachConcreteNode implements MachNode {
-    I2f8X86(Node i2f8 ) { super(i2f8); }
-    @Override public String op() { return "cvtf"; }
-    @Override public RegMask regmap(int i) { assert i==1; return x86_64_v2.WMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.XMASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.sse(enc,0xF2,0x0F2A,true,enc.reg(this)-x86_64_v2.XMM_OFFSET,enc.reg(in(1)));
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p("(flt)").p(code.reg(in(1)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ImmX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ImmX86.java
deleted file mode 100644
index 5a4ff4b2..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ImmX86.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-
-public abstract class ImmX86 extends MachConcreteNode implements MachNode {
-    final int _imm;
-    ImmX86( Node add, int imm ) {
-        super(add);
-        _inputs.pop();          // Pop constant input off
-        _imm = imm;
-    }
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    @Override public int twoAddress() { return 1; }
-    @Override public RegMask killmap() { return x86_64_v2.FLAGS_MASK; }
-
-    abstract int opcode();
-    abstract int mod();
-
-    @Override public void encoding( Encoding enc ) {
-        X86.imm(enc,opcode(),mod(),enc.reg(this),_imm);
-    }
-
-    // General form: "addi  dst += #imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" ").p(glabel()).p("= #").p(_imm);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/IntX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/IntX86.java
deleted file mode 100644
index 2ffaa3d1..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/IntX86.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Integer constants
-public class IntX86 extends ConstantNode implements MachNode {
-    final String _ext;
-    IntX86( ConstantNode con, String ext ) { super(con); _ext = ext; }
-    @Override public String op() {
-        return _con == Type.NIL || _con == TypeInteger.ZERO ? "xor" : "ldi";
-    }
-    @Override public boolean isClone() { return true; }
-    @Override public Node copy() { return new IntX86(this,_ext); }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    // Zero-set uses XOR kills flags
-    @Override public RegMask killmap() {
-        return _con == Type.NIL || _con == TypeInteger.ZERO ? x86_64_v2.FLAGS_MASK : null;
-    }
-
-    @Override public void encoding( Encoding enc ) {
-        if( _ext!=null ) throw Utils.TODO();
-        X86.constant(enc,enc.reg(this),_con==Type.NIL ? 0 : ((TypeInteger)_con).value());
-    }
-
-    // Human-readable form appended to the SB.  Things like the encoding,
-    // indentation, leading address or block labels not printed here.
-    // Just something like "ld4\tR17=[R18+12] // Load array base".
-    // General form: "op\tdst=src+src"
-    @Override public void asm(CodeGen code, SB sb) {
-        String reg = code.reg(this);
-        if( _con == Type.NIL || _con == TypeInteger.ZERO )
-            sb.p(reg).p(",").p(reg);
-        else
-            _con.print(sb.p(reg).p(" = #"));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/JmpX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/JmpX86.java
deleted file mode 100644
index 10cee059..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/JmpX86.java
+++ /dev/null
@@ -1,65 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Jump on flags, uses flags
-public class JmpX86 extends IfNode implements MachNode, RIPRelSize {
-    String _bop;
-    JmpX86( IfNode iff, String bop ) {
-        super(iff);
-        _bop = bop;
-    }
-    @Override public String op() { return "j"+_bop; }
-    @Override public String label() { return op(); }
-    @Override public void postSelect(CodeGen code) {
-        Node set = in(1);
-        if( set==null ) return; // Never-node cutout
-        Node cmp = set.in(1);
-        // Bypass an expected Set and just reference the cmp directly
-        if( set instanceof SetX86 setx && (cmp instanceof CmpX86 || cmp instanceof CmpIX86 || cmp instanceof CmpMemX86 || cmp instanceof CmpFX86) ) {
-            _inputs.set( 1, cmp );
-            _bop = setx._bop;
-        } else
-            throw Utils.TODO();
-    }
-    @Override public RegMask regmap(int i) { assert i==1; return x86_64_v2.FLAGS_MASK; }
-    @Override public RegMask outregmap() { return null; }
-    @Override public void negate() { _bop = negate(_bop);  }
-
-    @Override public void encoding( Encoding enc ) {
-        if( in(1)==null && _bop=="!=" ) return;
-        X86.branch(enc,in(1)==null ? -1 : x86_64_v2.jumpop(_bop)&15);
-        enc.jump(this,cproj(0));
-    }
-
-    // Delta is from opcode start, but X86 measures from the end of the 2-byte encoding
-    @Override public byte encSize(int delta) {
-        if( in(1)==null && _bop=="!=" ) return 0;
-        return X86.branchSize(delta,in(1)!=null);
-    }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        assert !(in(1)==null && _bop=="!=");
-        X86.patchBranch(enc.bits(),opStart,opLen,delta,in(1)==null ? -1 : x86_64_v2.jumpop(_bop)&15);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        if( in(1)!=null ) {     // Never-node
-            String src = code.reg(in(1));
-            if( src!="flags" ) sb.p(src).p(" ");
-        } else if( _bop=="!=" ) {
-            sb.p("never");
-            return;
-        }
-        CFGNode prj = cproj(0).uctrlSkipEmpty(); // 0 is True is jump target
-        if( !prj.blockHead() ) prj = prj.cfg0();
-        sb.p(label(prj));
-    }
-
-    @Override public String comment() { return "L"+cproj(1)._nid; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/LeaX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/LeaX86.java
deleted file mode 100644
index 4b00e4dd..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/LeaX86.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class LeaX86 extends MachConcreteNode implements MachNode {
-    final int _scale;
-    final int _offset;
-    LeaX86( Node add, Node base, Node idx, int scale, int offset ) {
-        super(add);
-        assert scale==0 || scale==1 || scale==2 || scale==3;
-        _inputs.pop();
-        _inputs.pop();
-        _inputs.push(base);
-        _inputs.push(idx);
-        _scale = scale;
-        _offset = offset;
-    }
-
-    @Override public String op() { return "lea"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.lea(enc,enc.reg(this),enc.reg(in(1)),enc.reg(in(2)),_offset,_scale);
-    }
-
-    // General form: "lea  dst = base + 4*idx + 12"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ");
-        if( in(1) != null )
-            sb.p(code.reg(in(1))).p(" + ");
-        sb.p(code.reg(in(2))).p("<<").p(_scale);
-        if( _offset!=0 ) sb.p(" + #").p(_offset);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/LoadX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/LoadX86.java
deleted file mode 100644
index 5c472dbe..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/LoadX86.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.LoadNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class LoadX86 extends MemOpX86 {
-    LoadX86( LoadNode ld, Node base, Node idx, int off, int scale ) {
-        super(ld,ld, base, idx, off, scale, 0);
-    }
-    @Override public String op() { return "ld"+_sz; }
-    @Override public RegMask outregmap() { return _con instanceof TypeFloat ? x86_64_v2.XMASK : x86_64_v2.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        // REX.W + 8B /r	MOV r64, r/m64
-        // Zero extension for u8, u16 and u32 but sign extension i8, i16, i32
-        // Use movsx and movzx
-        short dst = enc.reg(this );
-        short ptr = enc.reg(ptr());
-        short idx = enc.reg(idx());
-        enc(enc, _con, dst, ptr, idx, _off, _scale);
-    }
-
-    static void enc( Encoding enc, Type decl, short dst, short ptr, short idx, int off, int scale ) {
-        // The chapter chooses the register bank and extension from its own type facts.
-        boolean xmm=dst>=x86_64_v2.XMM_OFFSET;
-        if( xmm && decl.log_size()==3 ) decl=TypeFloat.F64;
-        else if( !xmm && decl instanceof TypeFloat )
-            decl=decl==TypeFloat.F32 ? TypeInteger.U32 : TypeInteger.BOT;
-        boolean signed=decl.isa(TypeInteger.I8) || decl==TypeInteger.I16 || decl==TypeInteger.I32;
-        X86.load(enc,decl.log_size(),signed,xmm,
-                 xmm ? dst-x86_64_v2.XMM_OFFSET : dst,ptr,idx,off,scale);
-    }
-
-
-    // General form: "ldN  dst,[base + idx<<2 + 12]"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(",");
-        asm_address(code,sb);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MemAddX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MemAddX86.java
deleted file mode 100644
index 2e18a058..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MemAddX86.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class MemAddX86 extends MemOpX86 {
-    MemAddX86( StoreNode st, Node base, Node idx, int off, int scale, int imm, Node val ) {
-        super(st, st, base, idx, off, scale, imm, val );
-    }
-    @Override public String op() {
-        return (_imm == 1 ? "inc" : (_imm == -1 ? "dec" : "add")) + _sz;
-    }
-    // Register mask allowed as a result.  0 for no register.
-    @Override public RegMask outregmap() { return null; }
-    @Override public RegMask killmap() { return x86_64_v2.FLAGS_MASK; }
-    @Override public void encoding( Encoding enc ) {
-        X86.addMem(enc,enc.reg(val()),_imm,enc.reg(ptr()),enc.reg(idx()),_off,_scale);
-    }
-    // General form: "add  [base + idx<<2 + 12] += src"
-    @Override public void asm(CodeGen code, SB sb) {
-        asm_address(code,sb);
-        if( val()==null ) {
-            if( _imm != 1 && _imm != -1 ) sb.p(" += #").p(_imm);
-        } else sb.p(" += ").p(code.reg(val()));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MemOpX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MemOpX86.java
deleted file mode 100644
index fcca7f8f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MemOpX86.java
+++ /dev/null
@@ -1,89 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.SB;
-import java.lang.StringBuilder;
-
-// Generic X86 memory operand base.
-// inputs:
-//   ctrl     - will appear for possibly RCE (i.e. array ops)
-//   mem      - memory dependence edge
-//   base     - Basic object pointer
-//   idx/null - Scaled index offset, or null if none
-//   val/null - Value to store, as part of an op-to-mem or op-from-mem.  Null for loads, or if an immediate is being used
-// Constants:
-//   offset   - offset added to base.  Can be zero.
-//   scale    - scale on index; only 0,1,2,4,8 allowed, 0 is only when index is null
-//   imm      - immediate value to store or op-to-mem, and only when val is null
-public abstract class MemOpX86 extends MemOpNode implements MachNode {
-    final int _off;             // Limit 32 bits
-    final int _scale;           // Limit 0,1,2,3
-    final int _imm;             // Limit 32 bits
-    final char _sz;             // Handy print name
-    MemOpX86( Node op, MemOpNode mop, Node base, Node idx, int off, int scale, int imm ) {
-        super(op,mop);
-        assert base._type instanceof TypeMemPtr && !(base instanceof AddNode);
-        assert (idx==null && scale==0) || (idx!=null && 0<= scale && scale<=3);
-
-        // Copy memory parts from e.g. the LoadNode over the opcode, e.g. an Add
-        if( op != mop ) {
-            _inputs.set(0,mop.in(0)); // Control from mem op
-            _inputs.set(1,mop.in(1)); // Memory  from mem op
-            _inputs.set(2,base);      // Base handed in
-        }
-
-        assert ptr() == base;
-        _inputs.setX(3,idx);
-        _off = off;
-        _scale = scale;
-        _imm = imm;
-        int size = mop instanceof StoreNode st ? st.storeSize() : 1<<_con.log_size();
-        _sz = (char)('0'+size);
-    }
-
-    // Store-based flavors have a value edge
-    MemOpX86( Node op, MemOpNode mop, Node base, Node idx, int off, int scale, int imm, Node val ) {
-        this(op,mop,base,idx,off,scale,imm);
-        _inputs.setX(4,val);
-    }
-
-    Node idx() { return in(3); }
-    Node val() { return in(4); } // Only for stores, including op-to-memory
-
-    @Override protected ExprPrinter<Node> _printMach(ExprPrinter<Node> p) {
-        return p.p(".").p(_name);
-    }
-
-    @Override public String label() { return op(); }
-    @Override public Type compute() { throw new AssertionError("Do not call compute on "+getClass().getSimpleName()); }
-    @Override public Node idealize() { throw new AssertionError("Do not call idealize on "+getClass().getSimpleName()); }
-
-    // Register mask allowed on input i.
-    @Override public RegMask regmap(int i) {
-        if( i==1 ) return null;               // Memory
-        if( i==2 ) return x86_64_v2.RMASK;    // base  in GPR
-        if( i==3 ) return x86_64_v2.RMASK;    // index in GPR
-        if( i==4 ) return _sz >= '4'
-                       ? x86_64_v2.MEM_MASK   // value in GPR or XMM
-                       : x86_64_v2.RMASK;     // Bytes and shorts in GPR only
-        return null; // Anti-dependence
-    }
-
-    // "[base + idx<<2 + 12]"
-    SB asm_address(CodeGen code, SB sb) {
-        sb.p("[").p(code.reg(ptr()));
-        if( idx() != null ) {
-            sb.p("+").p(code.reg(idx()));
-            if( _scale != 0 )
-                sb.p("*").p((1<<_scale));
-        }
-        if( _off != 0 )
-            sb.p("+").p(_off);
-        return sb.p("]");
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MulFX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MulFX86.java
deleted file mode 100644
index 74616db7..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MulFX86.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class MulFX86 extends MachConcreteNode implements MachNode {
-    MulFX86( Node mulf) { super(mulf); }
-    @Override public String op() { return "mulf"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return x86_64_v2.XMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.XMASK; }
-    @Override public int twoAddress() { return 1; }
-    @Override public boolean commutes() { return true; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.sse(enc,0xF2,0x0F59,false,enc.reg(this)-x86_64_v2.XMM_OFFSET,enc.reg(in(2))-x86_64_v2.XMM_OFFSET);
-    }
-
-    // General form: "mulf  dst *= src"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" *= ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MulIX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MulIX86.java
deleted file mode 100644
index 5dcb253d..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MulIX86.java
+++ /dev/null
@@ -1,27 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class MulIX86 extends MachConcreteNode implements MachNode {
-    final int _imm;
-    MulIX86( Node add, int imm ) {
-        super(add);
-        _inputs.pop();          // Pop the constant input
-        _imm = imm;             // Record the constant
-    }
-    @Override public String op() { return "muli"; }
-    @Override public String glabel() { return "*"; }
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    // Rare 3-address form
-    @Override public final void encoding( Encoding enc ) {
-        X86.imul(enc,enc.reg(this),enc.reg(in(1)),_imm);
-    }
-    // General form: "addi  dst += #imm"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" * #").p(_imm);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MulX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MulX86.java
deleted file mode 100644
index 6f3fcdeb..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/MulX86.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class MulX86 extends MachConcreteNode implements MachNode {
-    MulX86( Node mul ) { super(mul); }
-    @Override public String op() { return "mul"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    @Override public int twoAddress() { return 1; }
-    @Override public boolean commutes() { return true; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.reg(enc,0x0FAF,enc.reg(this),enc.reg(in(2)));
-    }
-
-    // General form: "mul  dst *= src"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" = ").p(code.reg(in(1))).p(" * ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/NegX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/NegX86.java
deleted file mode 100644
index 86610f6d..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/NegX86.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class NegX86 extends MachConcreteNode implements MachNode {
-    NegX86(MinusNode not) { super(not); }
-    @Override public String op() { return "neg"; }
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap()   { return x86_64_v2.RMASK; }
-    @Override public RegMask killmap()     { return x86_64_v2.FLAGS_MASK; }
-    @Override public int twoAddress() { return 1; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.unary(enc,0xF7,3,enc.reg(this));
-    }
-    @Override public void asm(CodeGen code, SB sb) { sb.p(code.reg(this)); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/NewX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/NewX86.java
deleted file mode 100644
index d6a06c2f..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/NewX86.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeFunPtr;
-import com.seaofnodes.simple.util.SB;
-
-public class NewX86 extends NewNode implements MachNode {
-    // A pre-zeroed chunk of memory.
-    NewX86( NewNode nnn ) { super(nnn); }
-    @Override public void encoding( Encoding enc ) {
-        enc.external(this,"calloc");
-        X86.constant(enc,_arg2Reg,1);
-        X86.call(enc);
-    }
-    // General form: "alloc #bytes  PC"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p("\n");             // Multi-op trigger
-        sb.p("ldi   ").p(code._mach.regs()[_arg2Reg]).p(" = #1\n");
-        sb.p("call  #calloc");
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/NotX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/NotX86.java
deleted file mode 100644
index 1e4e7c26..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/NotX86.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class NotX86 extends MachConcreteNode implements MachNode {
-    NotX86(NotNode not) { super(not); }
-    @Override public String op() { return "not"; }
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.RMASK;  }
-    @Override public RegMask killmap() { return x86_64_v2.FLAGS_MASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        assert !(in(1) instanceof NotNode); // Cleared out by peeps
-        assert !(in(1) instanceof BoolNode);
-        X86.not(enc,enc.reg(this),enc.reg(in(1)));
-    }
-    @Override public void asm(CodeGen code, SB sb) { sb.p(code.reg(this)); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/OrIX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/OrIX86.java
deleted file mode 100644
index 15f4824d..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/OrIX86.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.node.Node;
-
-public class OrIX86 extends ImmX86 {
-    OrIX86( Node add, int imm ) { super(add,imm); }
-    @Override public String op() { return "ori"; }
-    @Override public String glabel() { return "|"; }
-    @Override int opcode() { return 0x81; }
-    @Override int mod() { return 1; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/OrX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/OrX86.java
deleted file mode 100644
index bc8f0ea8..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/OrX86.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.node.Node;
-
-public class OrX86 extends RegX86 {
-    OrX86( Node add ) { super(add); }
-    @Override public String op() { return "or"; }
-    @Override public String glabel() { return "|"; }
-    @Override int opcode() { return 0x0B; }
-    @Override public boolean commutes() { return true; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ParmX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ParmX86.java
deleted file mode 100644
index 5cfdd804..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ParmX86.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.ParmNode;
-
-public class ParmX86 extends ParmNode implements MachNode {
-    final RegMask _rmask;
-    ParmX86( ParmNode parm ) {
-        super(parm);
-        _rmask = x86_64_v2.callInMask(fun().sig(),_idx,1/*RPC*/);
-    }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return _rmask; }
-    @Override public void encoding( Encoding enc ) { }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ProjX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ProjX86.java
deleted file mode 100644
index 046c7b4c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ProjX86.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.ProjNode;
-
-public class ProjX86 extends ProjNode implements MachNode {
-    ProjX86( ProjNode p ) { super(p); }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() {
-        return ((MachNode)in(0)).outregmap(_idx);
-    }
-    @Override public void encoding( Encoding enc ) {}
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/RegX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/RegX86.java
deleted file mode 100644
index 06755143..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/RegX86.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public abstract class RegX86 extends MachConcreteNode {
-    RegX86( Node add ) { super(add); }
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    @Override public RegMask killmap() { return x86_64_v2.FLAGS_MASK; }
-    @Override public int twoAddress() { return 1; }
-    abstract int opcode();
-    @Override public void encoding( Encoding enc ) {
-        X86.reg(enc,opcode(),enc.reg(in(1)),enc.reg(in(2)));
-    }
-    // General form: "add  dst += src"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" ").p(glabel()).p("= ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/RetX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/RetX86.java
deleted file mode 100644
index e4467bb4..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/RetX86.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.*;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-
-public class RetX86 extends ReturnNode implements MachNode {
-    RetX86( ReturnNode ret, FunNode fun ) { super(ret, fun); fun.setRet(this); }
-    @Override public void encoding( Encoding enc ) {
-        int sz = fun()._frameAdjust;
-        if( sz!=0 ) X86.imm(enc,0x81,0,x86_64_v2.RSP,sz);
-        X86.ret(enc);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SarIX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SarIX86.java
deleted file mode 100644
index cf6275dc..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SarIX86.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.codegen.Encoding;
-import com.seaofnodes.simple.codegen.RegMask;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.node.MachNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.SB;
-
-// Arithmetic Right Shift
-public class SarIX86 extends MachConcreteNode implements MachNode {
-    final int _imm;
-    SarIX86( Node sari, int imm ) { super(sari); assert x86_64_v2.imm8(imm); _inputs.pop(); _imm = imm; }
-    @Override public String op() { return "sari"; }
-    @Override public String glabel() { return ">>"; }
-    int opcode() { return 0xC1; }
-    int mod() { return 7; }
-
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    @Override public int twoAddress() { return 1; }
-
-    @Override public void encoding(Encoding enc) {
-        X86.shift(enc,mod(),enc.reg(this),_imm);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" ").p(glabel()).p("= #").p(_imm);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SarX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SarX86.java
deleted file mode 100644
index 92493712..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SarX86.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.Utils;
-
-public class SarX86 extends RegX86 {
-    SarX86( Node add ) { super(add); }
-    @Override public String op() { return "sar"; }
-    @Override public String glabel() { return ">>"; }
-    @Override public RegMask regmap(int i) {
-        if (i == 1) return x86_64_v2.WMASK;
-        if (i == 2) return x86_64_v2.RCX_MASK;
-        throw Utils.TODO();
-    }
-    @Override int opcode() { return 0xD3; }
-    @Override public void encoding( Encoding enc ) {
-        X86.unary(enc,opcode(),7,enc.reg(this));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SetX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SetX86.java
deleted file mode 100644
index 864c1b55..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SetX86.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Corresponds to the x86 instruction "sete && setne".
-// Use result of comparison without jump.
-public class SetX86 extends MachConcreteNode implements MachNode {
-    final String _bop;          // One of <,<=,==
-    final boolean _unsigned;
-    // Constructor expects input is an X86 and not an Ideal node.
-    SetX86( Node cmp, String bop, boolean unsigned ) {
-        super(cmp);
-        _inputs.setLen(1);   // Pop the cmp inputs
-        // Replace with the matched cmp
-        _inputs.push(cmp);
-        _bop = bop;
-        _unsigned = unsigned;
-    }
-    @Override public String op() { return "set"+_bop; }
-    @Override public RegMask regmap(int i) { assert i==1; return x86_64_v2.FLAGS_MASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-
-    @Override public void encoding( Encoding enc ) {
-        int op=switch (_bop) {
-            case "==" -> 0x94;  // SETE
-            case "<"  -> _unsigned ? 0x92 : 0x9C;  // SETB /SETL
-            case "<=" -> _unsigned ? 0x96 : 0x9E;  // SETBE/SETLE
-            case ">=" -> _unsigned ? 0x93 : 0x9D;  // SETAE/SETGE
-            case ">"  -> _unsigned ? 0x97 : 0x9F;  // SETA /SETG
-            default -> throw Utils.TODO();
-            };
-        X86.set(enc,op&15,enc.reg(this));
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this));
-        String src = code.reg(in(1));
-        if( src!="flags" )  sb.p(" = ").p(src);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShlIX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShlIX86.java
deleted file mode 100644
index 1e62243e..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShlIX86.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.SB;
-
-public class ShlIX86 extends MachConcreteNode implements MachNode {
-    final int _imm;
-    ShlIX86( Node shli, int imm ) {
-        super(shli);
-        assert x86_64_v2.imm8(imm);
-        _inputs.pop();          // Pop constant input off
-        _imm = imm;
-    }
-    public int opcode() { return 0xC1; }
-    public int mod() { return 4; }
-
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    @Override public int twoAddress() { return 1; }
-
-    @Override public String op() { return "shli"; }
-    @Override public String glabel() { return "<<"; }
-    @Override public void encoding(Encoding enc) {
-        X86.shift(enc,mod(),enc.reg(this),_imm);
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" ").p(glabel()).p("= #").p(_imm);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShlX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShlX86.java
deleted file mode 100644
index 768d97e7..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShlX86.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.Utils;
-
-public class ShlX86 extends RegX86 {
-    ShlX86( Node add ) { super(add); }
-    @Override public String op() { return "shl"; }
-    @Override public String glabel() { return "<<"; }
-    @Override public RegMask regmap(int i) {
-        if (i == 1) return x86_64_v2.WMASK;
-        if (i == 2) return x86_64_v2.RCX_MASK;
-        throw Utils.TODO();
-    }
-    @Override int opcode() { return 0xD3; }
-    @Override public final void encoding( Encoding enc ) {
-        X86.unary(enc,opcode(),4,enc.reg(this));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShrIX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShrIX86.java
deleted file mode 100644
index 8a0d1b58..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShrIX86.java
+++ /dev/null
@@ -1,27 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.SB;
-
-public class ShrIX86 extends MachConcreteNode implements MachNode {
-    final int _imm;
-    ShrIX86( Node shri, int imm ) { super(shri); assert x86_64_v2.imm8(imm); _inputs.pop(); _imm = imm; }
-    @Override public String op() { return "shri"; }
-    @Override public String glabel() { return ">>>"; }
-    int opcode() { return 0xC1; }
-    int mod() { return 5; }
-
-    @Override public RegMask regmap(int i) { return x86_64_v2.RMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    @Override public int twoAddress() { return 1; }
-
-    @Override public void encoding(Encoding enc) {
-        X86.shift(enc,mod(),enc.reg(this),_imm);
-    }
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" ").p(glabel()).p("= #").p(_imm);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShrX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShrX86.java
deleted file mode 100644
index 1ba20fee..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/ShrX86.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.util.Utils;
-
-public class ShrX86 extends RegX86 {
-    ShrX86( Node add ) { super(add); }
-    @Override public String op() { return "shr"; }
-    @Override public String glabel() { return ">>>"; }
-    @Override public RegMask regmap(int i) {
-        if (i == 1) return x86_64_v2.WMASK;
-        if (i == 2) return x86_64_v2.RCX_MASK;
-        throw Utils.TODO();
-    }
-    @Override int opcode() { return 0xD3; }
-    @Override public final void encoding( Encoding enc ) {
-        X86.unary(enc,opcode(),5,enc.reg(this));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SplitFlagsX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SplitFlagsX86.java
deleted file mode 100644
index cb7694f9..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SplitFlagsX86.java
+++ /dev/null
@@ -1,25 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-
-// Flag snapshots can use GPRs or stack slots, but never XMM registers.
-public class SplitFlagsX86 extends SplitX86 {
-    private static final RegMask MASK = new RegMask(x86_64_v2.WR_BITS | (1L<<x86_64_v2.FLAGS) | x86_64_v2.SPILLS,-1L);
-    SplitFlagsX86(LRG lrg,String kind,byte round) { super(lrg,kind,round); }
-    @Override public RegMask regmap(int i) { return MASK; }
-    @Override public RegMask outregmap() { return MASK; }
-
-    @Override public void encoding(Encoding enc) {
-        short dst=enc.reg(this), src=enc.reg(in(1));
-        if( dst==src ) return;
-        if( dst==x86_64_v2.FLAGS || src==x86_64_v2.FLAGS ) {
-            boolean toFlags = dst==x86_64_v2.FLAGS;
-            int reg = toFlags ? src : dst;
-            if( reg>=x86_64_v2.MAX_REG )
-                X86.flagsStack(enc,fun(enc).computeStackOffset(enc._code,reg),toFlags);
-            else
-                X86.flags(enc,reg,toFlags);
-        } else super.encoding(enc);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SplitX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SplitX86.java
deleted file mode 100644
index 46f2cb16..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SplitX86.java
+++ /dev/null
@@ -1,45 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.FunNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.node.SplitNode;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeFloat;
-import com.seaofnodes.simple.type.TypeInteger;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-public class SplitX86 extends SplitNode {
-    SplitX86( LRG lrg, String kind, byte round ) { super(lrg,kind,round, new Node[2]); }
-    @Override public RegMask regmap(int i) { return x86_64_v2.SPLIT_MASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.SPLIT_MASK; }
-
-    // Moves among GPRs, XMM registers, and stack slots.
-    @Override public void encoding( Encoding enc ) {
-        short dst=enc.reg(this), src=enc.reg(in(1));
-        assert dst!=x86_64_v2.FLAGS && src!=x86_64_v2.FLAGS;
-        boolean dstX=dst>=x86_64_v2.XMM_OFFSET, srcX=src>=x86_64_v2.XMM_OFFSET;
-        // Stack spills
-        if( dst >= x86_64_v2.MAX_REG ) {
-            int off = fun(enc).computeStackOffset(enc._code,dst);
-            if( src >= x86_64_v2.MAX_REG ) {
-                // Rare stack-stack move.  push [RSP+soff]; pop [RSP+doff]
-                int soff = fun(enc).computeStackOffset(enc._code,src);
-                X86.stackCopy(enc,soff,off);
-                return;
-            }
-            StoreX86.encVal(enc, srcX ? TypeFloat.F64 : TypeInteger.BOT, (short)x86_64_v2.RSP, (short)-1/*index*/, src, off, 0);
-            return;
-        }
-        if( src >= x86_64_v2.MAX_REG ) {
-            int off = fun(enc).computeStackOffset(enc._code,src);
-            LoadX86.enc(enc, dstX ? TypeFloat.F64 : TypeInteger.BOT, dst, (short)x86_64_v2.RSP, (short)-1, off, 0);
-            return;
-        }
-
-        X86.move(enc,dstX,srcX,dstX ? dst-x86_64_v2.XMM_OFFSET : dst,
-                 srcX ? src-x86_64_v2.XMM_OFFSET : src);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/StoreX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/StoreX86.java
deleted file mode 100644
index 9ffa25fc..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/StoreX86.java
+++ /dev/null
@@ -1,48 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.print.ExprPrinter;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.ConstantNode;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.node.StoreNode;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeFloat;
-import com.seaofnodes.simple.util.SB;
-
-public class StoreX86 extends MemOpX86 {
-    StoreX86( StoreNode st, Node base, Node idx, int off, int scale, int imm, Node val ) {
-        super(st,st, base, idx, off, scale, imm, val);
-    }
-    @Override public String op() { return "st"+_sz; }
-    @Override protected ExprPrinter<Node> _printMach(ExprPrinter<Node> p) {
-        Node val = val();
-        p.p(".").p(_name).p("=");
-        if( val==null ) p.p(_imm);
-        else p.n(val);
-        return p.p(";");
-    }
-    // Register mask allowed as a result.  0 for no register.
-    @Override public RegMask outregmap() { return null; }
-    @Override public void encoding( Encoding enc ) {
-        short ptr=enc.reg(ptr()), idx=enc.reg(idx()), src=enc.reg(val());
-        if( src==-1 ) X86.storeImm(enc,Integer.numberOfTrailingZeros(_sz-'0'),_imm,ptr,idx,_off,_scale);
-        else encVal(enc,_con,ptr,idx,src,_off,_scale);
-    }
-
-    // Non-immediate encoding
-    static void encVal( Encoding enc, Type decl, short ptr, short idx, short src, int off, int scale ) {
-        boolean xmm=src>=x86_64_v2.XMM_OFFSET;
-        X86.store(enc,decl.log_size(),xmm,
-                  xmm ? src-x86_64_v2.XMM_OFFSET : src,ptr,idx,off,scale);
-    }
-
-
-    // General form: "stN  [base + idx<<2 + 12],val"
-    @Override public void asm(CodeGen code, SB sb) {
-        asm_address(code,sb).p(",");
-        if( val()==null ) sb.p("#").p(_imm);
-        else sb.p(code.reg(val()));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SubFX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SubFX86.java
deleted file mode 100644
index 29f0033a..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SubFX86.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.util.SB;
-
-public class SubFX86 extends MachConcreteNode implements MachNode {
-    SubFX86( Node subf) {  super(subf); }
-    @Override public String op() { return "subf"; }
-    @Override public RegMask regmap(int i) { assert i==1 || i==2; return x86_64_v2.XMASK; }
-    @Override public RegMask outregmap() { return x86_64_v2.XMASK; }
-    @Override public int twoAddress() { return 1; }
-
-    @Override public void encoding( Encoding enc ) {
-        X86.sse(enc,0xF2,0x0F5C,false,enc.reg(this)-x86_64_v2.XMM_OFFSET,enc.reg(in(2))-x86_64_v2.XMM_OFFSET);
-    }
-
-    // General form: "subf  dst -= src"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this)).p(" -= ").p(code.reg(in(2)));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SubX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SubX86.java
deleted file mode 100644
index 8da34bf5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/SubX86.java
+++ /dev/null
@@ -1,10 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.node.Node;
-
-public class SubX86 extends RegX86 {
-    SubX86( Node add ) { super(add); }
-    @Override public String op() { return "sub"; }
-    @Override public String glabel() { return "-"; }
-    @Override int opcode() { return 0x2B; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/TFPX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/TFPX86.java
deleted file mode 100644
index e3563713..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/TFPX86.java
+++ /dev/null
@@ -1,51 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.type.TypeFunPtr;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// Function constants
-public class TFPX86 extends FunPtrNode implements MachNode, RIPRelSize {
-    private byte _opLen;
-    final String _ext;          // External name
-    // Pointer to a Simple function
-    TFPX86( FunPtrNode fptr ) { this((TypeFunPtr)fptr._type,null); }
-    // Spill clone: copy inputs without registering their reverse edges;
-    // insertBefore will place and register the clone in its use block.
-    private TFPX86( TFPX86 fptr ) { super(fptr); _ext = fptr._ext; }
-    // Pointer to an Extern "C" function
-    TFPX86( TypeFunPtr fptr, String ext ) { super(fptr,CodeGen.CODE._start,null); _type = fptr; _ext = ext; }
-    @Override public String op() { return "ldx"; }
-    @Override public String label() { return op(); }
-    @Override public boolean isClone() { return true; }
-    @Override public TFPX86 copy() { return new TFPX86(this); }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    @Override public void encoding( Encoding enc ) {
-        if( _ext==null ) enc.relo(this);
-        else enc.external(this,_ext);
-        _opLen=X86.rip(enc,0,0x8D,true,enc.reg(this));
-    }
-
-    @Override public byte encSize(int delta) { return _opLen; }
-
-    // Delta is from opcode start, X86 expects it from opcode end
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        enc.patch4(opStart + opLen - 4, delta - opLen);
-    }
-
-    // Human-readable form appended to the SB.  Things like the encoding,
-    // indentation, leading address or block labels not printed here.
-    // Just something like "ld4\tR17=[R18+12] // Load array base".
-    // General form: "op\tdst=src+src"
-    @Override public void asm(CodeGen code, SB sb) {
-        sb.p(code.reg(this));
-        if( _ext == null ) _type.print(sb.p(" #"));
-        else sb.p(_ext);
-    }
-    @Override public boolean eq(Node n) { return this==n; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/TMPX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/TMPX86.java
deleted file mode 100644
index 682597f4..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/TMPX86.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.TypeMemPtr;
-import com.seaofnodes.simple.util.SB;
-
-public class TMPX86 extends ConstantNode implements MachNode, RIPRelSize{
-    private byte _opLen;
-    final String _ext;
-    TMPX86( ConstantNode con, String ext ) { super(con); _ext = ext; }
-    @Override public String op() { return "ldp"; }
-    @Override public RegMask regmap(int i) { return null; }
-    @Override public RegMask outregmap() { return x86_64_v2.WMASK; }
-    @Override public boolean isClone() { return true; }
-    @Override public Node copy() { return new TMPX86(this,_ext); }
-
-    @Override public void encoding( Encoding enc ) {
-        short dst = enc.reg(this);
-        // 0 or 1 for REX depending on the dst.
-        _opLen = X86.rip(enc,0,0x8D,true,dst);
-        if( _ext!=null ) enc.externalData(this,_ext);
-        else enc.largeConstant(this,((TypeMemPtr)_con)._obj, _opLen-4, 2/*ELF encoding PC32*/);
-    }
-
-    // Delta is from opcode start
-    @Override public byte encSize(int delta) { return _opLen; }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        enc.patch4(opStart + opLen - 4, delta - opLen);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        _con.print(sb.p(code.reg(this)).p(" = #"));
-    }
-    @Override public boolean eq(Node n) { return this==n; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/UJmpX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/UJmpX86.java
deleted file mode 100644
index 591a51c3..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/UJmpX86.java
+++ /dev/null
@@ -1,41 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.isa.X86;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.Type;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-
-// unconditional jump
-public class UJmpX86 extends CFGNode implements MachNode, RIPRelSize {
-    UJmpX86() { }
-    @Override public String op() { return "jmp"; }
-    @Override public String label() { return op(); }
-    @Override protected String format() { return "jmp "; }
-    @Override public RegMask regmap(int i) {return null; }
-    @Override public RegMask outregmap() { return null; }
-    @Override public Type compute() { throw Utils.TODO(); }
-    @Override public Node idealize() { throw Utils.TODO(); }
-    @Override public void encoding( Encoding enc ) {
-        enc.jump(this,uctrl());
-        X86.branch(enc,-1);
-    }
-
-    // Delta is from opcode start, but X86 measures from the end of the 2-byte encoding
-    @Override public byte encSize(int delta) {
-        return X86.branchSize(delta,false);
-    }
-
-    // Delta is from opcode start
-    @Override public void patch( Encoding enc, int opStart, int opLen, int delta ) {
-        X86.patchBranch(enc.bits(),opStart,opLen,delta,-1);
-    }
-
-    @Override public void asm(CodeGen code, SB sb) {
-        CFGNode target = uctrl();
-        //assert target.nOuts() > 1; // Should optimize jmp to empty targets
-        sb.p(label(target));
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/XorIX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/XorIX86.java
deleted file mode 100644
index 2d989a50..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/XorIX86.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.node.Node;
-
-public class XorIX86 extends ImmX86 {
-    XorIX86( Node add, int imm ) { super(add,imm); }
-    @Override public String op() { return "xori"; }
-    @Override public String glabel() { return "^"; }
-    @Override int opcode() { return 0x81; }
-    @Override int mod() { return 6; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/XorX86.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/XorX86.java
deleted file mode 100644
index 86703903..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/XorX86.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.node.Node;
-
-public class XorX86 extends RegX86 {
-    XorX86( Node add ) { super(add); }
-    @Override public String op() { return "xor"; }
-    @Override public String glabel() { return "^"; }
-    @Override int opcode() { return 0x33; }
-    @Override public boolean commutes() { return true; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/x86_64_v2.java b/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/x86_64_v2.java
deleted file mode 100644
index 3dc93bf6..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/x86_64_v2.java
+++ /dev/null
@@ -1,596 +0,0 @@
-package com.seaofnodes.simple.node.cpus.x86_64_v2;
-
-import com.seaofnodes.simple.codegen.*;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.Utils;
-
-public class x86_64_v2 extends Machine {
-    public x86_64_v2( CodeGen code ) {}
-    // X86-64 V2.  Includes e.g. SSE4.2 and POPCNT.
-    @Override public String name() { return "x86_64_v2"; }
-    @Override public int defaultOpSize() { return 5; }
-
-    public static final int RAX = 0, RCX = 1, RDX =  2, RBX =  3, RSP =  4, RBP =  5, RSI =  6, RDI =  7;
-    public static final int R08 = 8, R09 = 9, R10 = 10, R11 = 11, R12 = 12, R13 = 13, R14 = 14, R15 = 15;
-
-    public static final int XMM0  = 16, XMM1  = 17, XMM2  = 18, XMM3  = 19, XMM4  = 20, XMM5  = 21, XMM6  = 22, XMM7  = 23;
-    public static final int XMM8  = 24, XMM9  = 25, XMM10 = 26, XMM11 = 27, XMM12 = 28, XMM13 = 29, XMM14 = 30, XMM15 = 31;
-    public static final int FLAGS = 32;
-    public static final int MAX_REG = 33;
-    public static final int RPC = 33;
-
-    // Human-readable name for a register number, e.g. "RAX".
-    public static final String[] REGS = new String[]{
-            "rax", "rcx", "rdx", "rbx", "rsp", "rbp", "rsi", "rdi",
-            "r8" , "r9" , "r10", "r11", "r12", "r13", "r14", "r15",
-            "xmm0", "xmm1", "xmm2" , "xmm3" , "xmm4" , "xmm5" , "xmm6" , "xmm7" ,
-            "xmm8", "xmm9", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15",
-            "flags",
-    };
-    // Hard crash for bad register number, fix yer bugs!
-    @Override public String[] regs() { return REGS; }
-
-    public static int XMM_OFFSET = 16;
-    // General purpose register mask: pointers and ints, not floats
-    static final long RD_BITS = 0b1111111111111111L; // All the GPRs
-    static RegMask RMASK = new RegMask(RD_BITS);
-    // No RSP in the *write* general set.
-    static final long WR_BITS = 0b1111111111101111L; // All the GPRs minus RSP
-    static RegMask WMASK = new RegMask(WR_BITS);
-    // Xmm register mask
-    static final long FP_BITS = 0b1111111111111111L << XMM0; // All the XMMs
-    static RegMask XMASK = new RegMask(FP_BITS);
-    static RegMask FLAGS_MASK = new RegMask(FLAGS);
-    static RegMask RPC_MASK = new RegMask(RPC);
-    // Divide mask: exclude RDX:RAX
-    static RegMask DIV_MASK = new RegMask(RD_BITS & ~(1L<<RAX) & ~(1L<<RDX));
-
-    static final long SPILLS = -(1L << MAX_REG);
-    static final RegMask SPLIT_MASK = new RegMask(WR_BITS | FP_BITS | SPILLS, -1L );
-
-    // Load/store mask; both GPR and FPR
-    static RegMask MEM_MASK = new RegMask(WR_BITS | FP_BITS);
-
-    public static RegMask RAX_MASK = new RegMask(RAX);
-    public static RegMask RCX_MASK = new RegMask(RCX);
-    public static RegMask RDX_MASK = new RegMask(RDX);
-    public static RegMask RDI_MASK = new RegMask(RDI);
-    public static RegMask R08_MASK = new RegMask(R08);
-    public static RegMask R09_MASK = new RegMask(R09);
-    public static RegMask RSI_MASK = new RegMask(RSI);
-
-    public static RegMask XMM0_MASK = new RegMask(XMM0);
-
-    // Encoding
-    public static int REX    = 0x40;
-    public static int REX_W  = 0x48;
-    public static int REX_WR = 0x4C;
-    public static int REX_WRB= 0x4D;
-    public static int REX_WB = 0x49;
-
-    // opcode included here
-    // 0F 84 cd	JE  rel32
-    // 0F 85 cd	JNE rel32
-    // 0F 8F cd	JG  rel32
-    // 0F 8C cd	JL  rel32
-    // 0F 8E cd	JLE rel32
-    // 0F 8D cd	JGE rel32
-    static public int jumpop(String op) {
-        return switch (op) {
-        case "==" -> 0x84;
-        case "!=" -> 0x85;
-        case ">"  -> 0x8F;
-        case "<"  -> 0x8C;
-        case "<=" -> 0x8E;
-        case ">=" -> 0x8D;
-        default -> throw new IllegalArgumentException("Too many arguments");
-        };
-    }
-
-    // Limit of float args passed in registers
-    static RegMask[] XMMS8 = new RegMask[]{
-        new RegMask(XMM0), new RegMask(XMM1), new RegMask(XMM2), new RegMask(XMM3),
-        new RegMask(XMM4), new RegMask(XMM5), new RegMask(XMM6), new RegMask(XMM7),
-    };
-
-    // Map from function signature and argument index to register.
-    // Used to set input registers to CallNodes, and ParmNode outputs.
-    @Override public RegMask callArgMask( TypeFunPtr tfp, int idx, int maxArgSlot ) { return callInMask(tfp,idx,maxArgSlot); }
-    @Override public RegMask callArgMask( TypeFunPtr tfp, int idx, int maxArgSlot, String conv ) { return callInMask(tfp,idx,maxArgSlot,conv); }
-    static RegMask callInMask( TypeFunPtr tfp, int idx, int maxArgSlot ) {
-        return callInMask(tfp,idx,maxArgSlot,CodeGen.CODE._callingConv);
-    }
-    static RegMask callInMask( TypeFunPtr tfp, int idx, int maxArgSlot, String conv ) {
-        if( idx==0 ) return RPC_MASK;
-        if( idx==1 ) return null;
-        if( idx-2 >= tfp.nargs() ) return null; // Anti-dependence
-        return switch( conv ) {
-        case "SystemV" -> callSys5 (tfp,idx,maxArgSlot);
-        case "win64"   -> callWin64(tfp,idx,maxArgSlot);
-        default -> throw Utils.TODO();
-        };
-    }
-
-    // Maximum stack args used by this signature
-    @Override public short maxArgSlot( TypeFunPtr tfp ) {
-        return maxArgSlot(tfp,CodeGen.CODE._callingConv);
-    }
-    @Override public short maxArgSlot( TypeFunPtr tfp, String conv ) {
-        return switch( conv ) {
-        case "SystemV" -> maxArgSlotSys5 (tfp);
-        case "win64"   -> maxArgSlotWin64(tfp);
-        default -> throw Utils.TODO();
-        };
-    }
-
-    // Win64 - max *4* args in registers of all kinds; after that on stack.
-    // Stack args land in increasing memory order with empty/mirror slots for
-    // every register.
-    //
-    // foo( int i0, flt f1, int i2, flt f3, int i4, flt f5, int i6, ... )
-    //
-    // -- Prior Frame --
-    // i6
-    // f5
-    // i4
-    // empty mirror, XMM3= f3
-    // empty mirror, R08 = i2
-    // empty mirror, XMM1= f1
-    // empty mirror, RCX = i0
-    // -- Caller Frame; 16b align --
-    // RPC
-    // PAD/ALIGN
-    // -- Callee Frame; 16b align --
-    static RegMask[] WIN64_CALL = new RegMask[] {
-        RCX_MASK,
-        RDX_MASK,
-        R08_MASK,
-        R09_MASK,
-    };
-
-    static RegMask callWin64(TypeFunPtr tfp, int idx, int maxArgSlot ) {
-        // idx 2,3,4,5 passed in registers, with stack slot mirrors.
-        // idx >= 6 passed on stack, starting at slot#1 (#0 reserved for RPC).
-        int sigidx = idx-2;
-        if( hiddenSelf(tfp) ) {
-            if( sigidx==0 ) return null;
-            sigidx--;
-        }
-        if( sigidx >= 4 )
-            return new RegMask(MAX_REG+maxArgSlot+sigidx);
-        return tfp.arg(idx-2) instanceof TypeFloat
-            ? XMMS8     [sigidx]
-            : WIN64_CALL[sigidx];
-    }
-    static short maxArgSlotWin64(TypeFunPtr tfp) {
-        return (short)Math.max(4,tfp.nargs() - (hiddenSelf(tfp) ? 1 : 0));
-    }
-    static short maxIncomingArgSlotWin64(TypeFunPtr tfp) {
-        return (short)Math.max(0,tfp.nargs() - (hiddenSelf(tfp) ? 1 : 0) - 4);
-    }
-
-    // Sys5: max 6 GPRs and 8 FPRS filled first.  Extra args land in increasing
-    // memory order as needed - no mirror space.
-    //
-    // foo( int i0, flt f1, int i2, flt f3, int i4, flt f5, int i6, ... )
-    // RDI =i0, RSI =i2, RDX =i4, RCX =i6, R08 =i8, R09 =i10
-    // XMM0=f1, XMM1=f3, XMM2=f5, XMM3=f7, XMM4=f9, XMM5=f11, XMM6=f13, XMM7=f15
-    //
-    // -- Prior Frame --
-    // f18
-    // i18
-    // f17
-    // i16
-    // i14
-    // i12
-    // -- Caller Frame; 16b align --
-    // RPC
-    // PAD/ALIGN
-    // -- Callee Frame; 16b align --
-    // SystemV(param passing)
-    static RegMask[] SYS5_CALL = new RegMask[] {
-        RDI_MASK,
-        RSI_MASK,
-        RDX_MASK,
-        RCX_MASK,
-        R08_MASK,
-        R09_MASK,
-    };
-
-    static RegMask callSys5(TypeFunPtr tfp, int idx, int maxArgSlot ) {
-        // First 6 integers passed in registers: rdi,rsi,rdx,rcx,r08,r09
-        // First 8 floats passed in registers: xmm0-xmm7
-        int sigidx = idx-2;
-        if( hiddenSelf(tfp) ) {
-            if( sigidx==0 ) return null;
-            sigidx--;
-        }
-        int icnt=0, fcnt=0;     // Count of ints, floats
-        for( int i=hiddenSelf(tfp) ? 1 : 0; i<idx-2; i++ ) {
-            if( tfp.arg(i) instanceof TypeFloat ) fcnt++;
-            else icnt++;
-        }
-        int nstk = Math.max(icnt-6,0)+Math.max(fcnt-8,0);
-        return tfp.arg(idx-2) instanceof TypeFloat
-            ? fcnt<8 ? XMMS8    [fcnt] : new RegMask(MAX_REG+maxArgSlot+nstk)
-            : icnt<6 ? SYS5_CALL[icnt] : new RegMask(MAX_REG+maxArgSlot+nstk);
-    }
-    static short maxArgSlotSys5(TypeFunPtr tfp) {
-        int icnt=0, fcnt=0;     // Count of ints, floats
-        for( int i=hiddenSelf(tfp) ? 1 : 0; i<tfp.nargs(); i++ ) {
-            if( tfp.arg(i) instanceof TypeFloat ) fcnt++;
-            else icnt++;
-        }
-        int nstk = Math.max(icnt-6,0)+Math.max(fcnt-8,0);
-        return (short)nstk;
-    }
-    private static boolean hiddenSelf(TypeFunPtr tfp) {
-        return tfp.nargs() > 0 && tfp.arg(0) == TypePtr.PTR;
-    }
-
-    static final long SYSTEM5_CALLER_SAVE =
-        (1L << RAX) | (1L << RCX) | (1L << RDX) |
-        (1L << RDI) | (1L << RSI) |
-        (1L << R08) | (1L << R09) | (1L << R10) | (1L << R11) |
-        (1L << FLAGS) |           // Flags are killed
-        // All FP regs are killed
-        FP_BITS;
-
-    static final long WIN64_CALLER_SAVE =
-        (1L<< RAX) | (1L<< RCX) | (1L<< RDX) |
-        (1L<< R08) | (1L<< R09) | (1L<< R10) | (1L<< R11) |
-        (1L<<FLAGS)|           // Flags are killed
-        // Only XMM0-XMM5 are killed; XMM6-XMM15 are preserved
-        (1L<<XMM0) | (1L<<XMM1) | (1L<<XMM2) | (1L<<XMM3) |
-        (1L<<XMM4) | (1L<<XMM5) ;
-
-    @Override public long callerSave() {
-        return callerSave(CodeGen.CODE._callingConv);
-    }
-    @Override public long callerSave(String conv) {
-        return switch (conv) {
-        case "SystemV" -> SYSTEM5_CALLER_SAVE;
-        case "win64"   ->   WIN64_CALLER_SAVE;
-        default -> throw new IllegalArgumentException("Unknown calling convention: " + conv);
-        };
-    }
-    @Override public String cCallingConv(String callingConv) {
-        return callingConv;
-    }
-    @Override public long neverSave() { return 1L<<RSP; }
-    @Override public RegMask retMask( TypeFunPtr tfp ) {
-        return tfp.ret() instanceof TypeFloat ? XMM0_MASK : RAX_MASK;
-    }
-    @Override public int rpc() { return RPC; }
-
-
-    // Create a split op; any register to any register, including stack slots
-    @Override public SplitNode split(LRG lrg, String kind, byte round ) {
-        return lrg._machDef!=null && lrg._machDef.outregmap().test(FLAGS)
-            ? new SplitFlagsX86(lrg,kind,round)
-            : new SplitX86(lrg,kind,round);
-    }
-
-    // Return a MachNode unconditional branch
-    @Override public CFGNode jump() {
-        return new UJmpX86();
-    }
-
-    // Instruction selection
-    @Override
-    public Node instSelect(Node n) {
-        return switch (n) {
-        case AddNode      add -> add(add);
-        case AndNode      and -> and(and);
-        case BoolNode    bool -> cmp(bool);
-        case CLInitNode  init -> new CLInitNode(init);
-        case CProjNode      c -> new CProjNode(c);
-        case CallEndNode cend -> new CallEndMach(cend);
-        case CallNode    call -> call(call);
-        case PtrToIntNode  ptr -> new PtrToIntMach(ptr);
-        case GuardNode  guard -> new GuardMach(guard);
-        case ConstantNode con -> con(con);
-        case DivNode      div -> div.mode()==2 ? new DivFX86(div) : new DivX86(div);
-        case EscapeNode   esc -> new EscapeNode(esc);
-        case FunNode      fun -> new FunX86(fun);
-        case FunPtrNode  fptr -> fptr(fptr);
-        case IfNode       iff -> jmp(iff);
-        case LoadNode      ld -> ld(ld);
-        case MemMergeNode mem -> new MemMergeNode(mem);
-        case MinusNode    neg -> {
-            if( neg.mode()==2 ) throw Utils.TODO();
-            yield new NegX86(neg);
-        }
-        case MulNode      mul -> mul.mode()==2 ? new MulFX86(mul) : mul(mul);
-        case NewNode      nnn -> new NewX86(nnn);
-        case NotNode      not -> new NotX86(not);
-        case OrNode        or -> or(or);
-        case ParmNode    parm -> new ParmX86(parm);
-        case BulkMemPhiNode phi-> new BulkMemPhiNode(phi);
-        case MemPhiNode  phi  -> new MemPhiNode(phi);
-        case PhiNode      phi -> new PhiNode(phi);
-        case ProjNode     prj -> prj(prj);
-        case ReadOnlyNode read-> new ReadOnlyMach(read);
-        case ReturnNode   ret -> new RetX86(ret, ret.fun());
-        case SarNode      sar -> sar(sar);
-        case ShlNode      shl -> shl(shl);
-        case ShrNode      shr -> shr(shr);
-        case StartCUNode start -> new StartCUNode(start);
-        case StopCUNode  stop -> new StopCUNode(stop);
-        case StartNode  start -> new StartNode(start);
-        case StopNode    stop -> new StopNode(stop);
-        case StoreNode     st -> st(st);
-        case SubNode      sub -> sub.mode()==2 ? new SubFX86(sub) : sub(sub);
-        case ToFloatNode  tfn -> i2f8(tfn);
-        case ToIntegerNode cvt -> new F8ToIX86(cvt);
-        case XCtrlNode      x -> ConstantNode.raw(Type.XCONTROL);
-        case XorNode      xor -> xor(xor);
-
-        case LoopNode loop -> new LoopNode(loop);
-        case RegionNode region -> new RegionNode(region);
-        default -> throw Utils.TODO();
-        };
-    }
-
-    public static boolean imm8( long imm ) { return -128 <= imm && imm <= 127; }
-
-    public static boolean imm32( long imm ) { return (int)imm==imm; }
-
-    // Attempt a full LEA-style break down.
-    private Node add(AddNode add) {
-        if( add.mode()==2 )
-            return new AddFX86(add);
-        Node lhs = add.in(1);
-        Node rhs = add.in(2);
-        if( lhs instanceof LoadNode ld && ld.nOuts() == 1 && ld.declaredType().log_size() >= 3)
-            return new AddMemX86(add, address(ld), ld.ptr(), idx, off, scale, 0, rhs);
-        // Attempt a full LEA-style break down.
-        // Returns one of AddX86, AddIX86, LeaX86, or LHS
-        if( rhs instanceof ConstantNode off2 && off2._con instanceof TypeInteger toff ) {
-            long imm = toff.value();
-            assert imm!=0;        // Folded in peeps
-            if( (int)imm != imm ) // Full 64bit immediate
-                return new AddX86(add);
-            // Now imm <= 32bits
-            if( lhs instanceof AddNode ladd )
-                // ((base + (idx << scale)) + off)
-                return _lea(add, ladd.in(1), ladd.in(2), (int)imm);
-            if( lhs instanceof ShlNode shift )
-                // (idx << scale) + off; no base
-                return _lea(add, null, shift, (int)imm);
-
-            // lhs + rhs1
-            return new AddIX86(add, (int)imm);
-        }
-        return _lea(add, lhs, rhs, 0);
-    }
-
-
-    private Node _lea(Node add, Node base, Node idx, int off) {
-        int scale = 0;
-        if( base instanceof ShlNode && !(idx instanceof ShlNode) )
-            throw Utils.TODO(); // Bug in canonicalization, should on RHS
-        if( idx instanceof ShlNode shift && shift.in(2) instanceof ConstantNode shfcon &&
-            shfcon._con instanceof TypeInteger tscale && 0 <= tscale.value() && tscale.value() <= 3 ) {
-            idx = shift.in(1);
-            scale = ((int) tscale.value());
-        }
-        // (base + idx) + off
-        return off == 0 && scale == 0
-            ? new AddX86(add)
-            : new LeaX86(add, base, idx, scale, off);
-    }
-
-
-    private Node and(AndNode and) {
-        if( and.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm32(ti.value()) )
-            return new AndIX86(and, (int)ti.value());
-        return new AndX86(and);
-    }
-
-    private Node call(CallNode call) {
-        return call.fptr() instanceof FunPtrNode con
-            ? new CallX86(call, (TypeFunPtr)con._type)
-            : call.fptr() instanceof ConstantNode con && con._type instanceof TypeFunPtr
-            ? new CallX86(call, (TypeFunPtr)con._type)
-            : new CallRX86(call);
-    }
-
-    // Because X86 flags, a normal ideal Bool is 2 X86 ops: a "cmp" and at "setz".
-    // Ideal If reading from a setz will skip it and use the "cmp" instead.
-    private static boolean swap, unsigned;
-    private Node cmp( BoolNode bool ) {
-        swap = unsigned = false;
-        Node cmp = _cmp(bool);
-        return new SetX86(cmp, swap ? IfNode.swap(bool.op()) : bool.op(), unsigned);
-    }
-
-    private Node _cmp(BoolNode bool) {
-        // Float variant
-        if( bool.isFloat() ) {
-            unsigned = true;
-            return new CmpFX86(bool);
-        }
-        Node lhs = bool.in(1);
-        Node rhs = bool.in(2);
-
-        // Since cmp does not record a BOP, SetX/Jmp need to know if the CMP is swapped.
-
-        // Vs memory
-        if( lhs instanceof LoadNode ld && ld.nOuts() == 1 && rhs._type.isa(ld.declaredType()) )
-            return new CmpMemX86(bool, address(ld), ld.ptr(), idx, off, scale, imm(rhs), val, false);
-
-        // Operands swap in the encoding directly, no need for Set/Jmp to swap `bop`
-        if( rhs instanceof LoadNode ld && ld.nOuts() == 1 && lhs._type.isa(ld.declaredType()) &&
-            (!(lhs instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm32(ti.value())) ||
-             bool.op()=="==" || bool.op()=="!=") )
-            return new CmpMemX86(bool, address(ld), ld.ptr(), idx, off, scale, imm(lhs), val, true );
-
-        // Vs immediate
-        if( rhs instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm32(ti.value()) )
-            return new CmpIX86(bool, (int)ti.value(), false);
-
-        // Operand swap compare; Set and Jmp need to swap `bop`
-        if( lhs instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm32(ti.value()) )
-            return new CmpIX86(bool, (int)ti.value(), swap=true);
-
-        // x vs y
-        return new CmpX86(bool);
-    }
-
-    private Node con( ConstantNode con ) {
-        if( !con._con.isConstant() )
-            return ConstantNode.raw(con); // Default unknown caller inputs
-        String ext = con instanceof ExternNode ext0 ? ext0._extern : null;
-        return switch (con._con) {
-        case TypeInteger ti -> new IntX86(con,ext);
-        case TypeFloat   tf -> new FltX86(con,ext);
-        case TypeMemPtr tmp -> new TMPX86(con,ext);
-        case TypeFunPtr tfp -> new TFPX86(tfp,ext);
-        case TypeNil tn -> throw Utils.TODO();
-        // TOP, BOTTOM, XCtrl, Ctrl, etc.  Never any executable code.
-        case Type t -> t == Type.NIL ? new IntX86(con,null) : ConstantNode.raw(con);
-        };
-    }
-
-    private Node fptr( FunPtrNode con ) {
-        return new TFPX86(con);
-    }
-
-    private Node i2f8(ToFloatNode tfn) {
-        assert tfn.in(1)._type instanceof TypeInteger ti;
-        return new I2f8X86(tfn);
-    }
-
-    private Node jmp(IfNode iff) {
-        // If/Bool combos will match to a Cmp/Set which sets flags.
-        // Most general arith ops will also set flags, which the Jmp needs directly.
-        // Loads do not set the flags, and will need an explicit TEST
-        String op = "!=";
-        if( iff.in(1) instanceof BoolNode bool ) op = swap ? IfNode.swap(bool.op()) : bool.op();
-        else if( iff.in(1)==null ) op = "=="; // Never-node cutout
-        else iff.setDef(1, new BoolNode.NE(iff.in(1),
-                                           ConstantNode.raw(TypeInteger.ZERO),
-                                           (byte)(iff.in(1)._type instanceof TypeFloat ? 2 : 1)));
-        return new JmpX86(iff, op);
-    }
-
-    private Node ld(LoadNode ld) {
-        return new LoadX86(address(ld), ld.ptr(), idx, off, scale);
-    }
-
-    private Node mul(MulNode mul) {
-        if( mul.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm32(ti.value()) )
-            return new MulIX86(mul, (int)ti.value());
-        return new MulX86(mul);
-    }
-
-    private Node or(OrNode or) {
-        if( or.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm32(ti.value()) )
-            return new OrIX86(or, (int)ti.value());
-        return new OrX86(or);
-    }
-
-    private Node prj( ProjNode prj ) {
-        if( prj.in(0) instanceof CLInitNode ) return new ProjNode(prj);
-        TypeInteger ret = cReturn(prj);
-        if( ret!=null ) return new ExtendX86(prj,ret);
-        return prj.in(0) instanceof StartNode ? new ProjNode(prj) : new ProjX86(prj);
-    }
-
-    private Node sar(SarNode sar) {
-        if( sar.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm8(ti.value()))
-            return new SarIX86(sar, (int)(ti.value() & 0xff) );
-        return new SarX86(sar);
-    }
-
-    private Node shl(ShlNode shl) {
-        if( shl.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm8(ti.value()))
-            return new ShlIX86(shl, (int)(ti.value() & 0xff) );
-        return new ShlX86(shl);
-    }
-
-    private Node shr( ShrNode shr ) {
-        if( shr.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm8(ti.value()) )
-            return new ShrIX86(shr, (int)(ti.value() & 0xff) );
-        return new ShrX86(shr);
-    }
-
-    private Node st( StoreNode st ) {
-        // Look for "*ptr op= val"
-        Node op = st.val();
-        if( op instanceof AddNode ) {
-            if( op.in(1) instanceof LoadNode ld && stld_match(st,ld) )
-                return new MemAddX86(address(st), st.ptr(), idx, off, scale, imm(op.in(2)), val);
-            if( op.in(2) instanceof LoadNode ld && stld_match(st,ld) )
-                return new MemAddX86(address(st), st.ptr(), idx, off, scale, imm(op.in(1)), val);
-        }
-        return new StoreX86(address(st), st.ptr(), idx, off, scale, imm(st.val()), val);
-    }
-    private static boolean stld_match(StoreNode st, LoadNode ld ) {
-        return
-            ld.in(0) == st.in(0) &&
-            ld.mem() == st.mem() &&
-            ld.ptr() == st.ptr() &&
-            ld.off() == st.off();
-    }
-
-
-    private Node sub (SubNode sub ){
-        return sub.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti
-            ? new AddIX86(sub, (int)-ti.value())
-            : new SubX86(sub);
-    }
-
-    private Node xor (XorNode xor){
-        if( xor.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti && imm32(ti.value()) )
-            return new XorIX86(xor, (int)ti.value());
-        return new XorX86(xor);
-    }
-
-    // Gather X86 addressing mode bits prior to constructing.  This is a
-    // builder pattern, but saving the bits in a *local* *global* here to keep
-    // mess contained.
-    private static int off, scale, imm;
-    private static Node idx, val;
-    private <N extends MemOpNode > N address(N mop) {
-        off = scale = imm = 0;  // Reset
-        idx = val = null;
-        Node base = mop.ptr();
-        // Skip/throw-away a ReadOnly, only used to typecheck
-        if(base instanceof ReadOnlyNode read) base = read.in(1);
-        assert !(base instanceof AddNode) && base._type instanceof TypeMemPtr; // Base ptr always, not some derived
-        if(mop.off() instanceof AddNode add && add.in(2) instanceof ConstantNode con && con._con instanceof TypeInteger ti) {
-            off = (int) ti.value();
-            assert off == ti.value(); // In 32-bit range
-            idx = add.in(1);
-            if(idx instanceof ShlNode shift && shift.in(2) instanceof ConstantNode shfcon &&
-                    shfcon._con instanceof TypeInteger tscale && 0 <= tscale.value() && tscale.value() <= 3) {
-                idx = shift.in(1);
-                scale = (int) tscale.value();
-            }
-        } else {
-            if(mop.off() instanceof ConstantNode con && con._con instanceof TypeInteger ti) {
-                off = (int) ti.value();
-                assert off == ti.value(); // In 32-bit range
-            } else {
-                idx = mop.off();
-            }
-        }
-        return mop;
-    }
-
-    private int imm( Node xval ) {
-        assert val == null && imm == 0;
-        if( xval instanceof ConstantNode con && con._con instanceof TypeInteger ti && ti.isConstant() && imm32(ti.value()) ) {
-            val = null;
-            imm = (int) ti.value();
-            assert imm == ti.value(); // In 32-bit range
-        } else {
-            val = xval;
-        }
-        return imm;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/print/ASMPrinter.java b/chapter-modules/src/main/java/com/seaofnodes/simple/print/ASMPrinter.java
deleted file mode 100644
index 58506e9c..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/print/ASMPrinter.java
+++ /dev/null
@@ -1,101 +0,0 @@
-package com.seaofnodes.simple.print;
-
-import com.seaofnodes.print.AssemblyAdapter;
-import com.seaofnodes.print.ASMPrinter.Data;
-import com.seaofnodes.print.ASMPrinter.Pool;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.type.*;
-import com.seaofnodes.simple.util.BAOS;
-import java.util.ArrayList;
-import com.seaofnodes.simple.codegen.Encoding;
-import java.util.HashMap;
-
-/** Machine-specific facts; traversal, columns and byte display live in print/. */
-public final class ASMPrinter extends AssemblyAdapter<Node> {
-    private final CodeGen _code;
-    private final Encoding _enc;
-    private ASMPrinter(CodeGen code) {
-        super(new IRPrinter());
-        _code=code;
-        _enc=code._encoding;
-    }
-    public static SB print(SB sb, CodeGen code) {
-        return sb.p(new com.seaofnodes.print.ASMPrinter<>(new ASMPrinter(code)).print());
-    }
-    @Override public ArrayList<Node> blocks() {
-        var blocks=new ArrayList<Node>();
-        var cfg=_enc==null ? _code._cfg : _enc._cfg;
-        if( cfg!=null ) for( Node n : cfg ) blocks.add(n);
-        return blocks;
-    }
-    @Override public String op(Node n) { return n instanceof MachNode m ? m.op() : n.label(); }
-    @Override public String register(Node n) { return _code.reg(n); }
-    @Override public String comment(Node n) { return n.comment(); }
-    @Override public String phiName(Node n) { return ((PhiNode)n)._label; }
-    @Override public String operands(Node n) {
-        SB sb=new SB();
-        if( n instanceof MachNode m ) m.asm(_code,sb);
-        else if( !(n._type instanceof TypeMem) ) {
-            sb.p(n._nid).p(": ");
-            for( Node def : n._inputs ) sb.p(def==null ? "___" : Integer.toString(def._nid)).p(' ');
-        }
-        return sb.toString();
-    }
-    @Override public boolean labelBlock(Node n) {
-        return !(n instanceof FunNode) && !(n instanceof IfNode) && !(n instanceof CallNode) &&
-            !(n instanceof CallEndNode) && !(n instanceof CProjNode && ir.input0(n) instanceof CallEndNode);
-    }
-    @Override public boolean hidden(Node n) {
-        if( n instanceof PhiNode || n instanceof ProjNode )
-            if( n._type instanceof TypeMem || n._type instanceof TypeRPC ) return true;
-        if( postAlloc() && n instanceof CalleeSaveNode ) return true;
-        if( n instanceof MemMergeNode ) return true;
-        if( n instanceof EscapeNode ) return true;
-        return n.getClass()==ConstantNode.class;
-    }
-    @Override public boolean postAlloc() { return _code._phase.ordinal()>CodeGen.Phase.RegAlloc.ordinal() ||
-        (_code._phase==CodeGen.Phase.RegAlloc && _code._regAlloc!=null && _code._regAlloc.done()); }
-    @Override public boolean encoded() { return _enc!=null && _code._phase.ordinal()>=CodeGen.Phase.Encoding.ordinal(); }
-    @Override public int defaultSize() { return _code._mach==null ? 2 : _code._mach.defaultOpSize(); }
-    @Override public boolean littleEndian() { return _code._asmLittle; }
-    @Override public boolean prologue(Node n) { return ((FunNode)n)._frameAdjust!=0; }
-    @Override public byte[] bytes() { return encoded() ? _enc._bits.buf() : null; }
-    @Override public int offset(Node n) { return encoded() ? _enc.opStart(n) : -1; }
-    @Override public int size(Node n) { return encoded() ? _enc.opLen(n)&255 : 0; }
-    private static ArrayList<Data> entries(Iterable<Encoding.Relo> relos, boolean ro) {
-        var data=new ArrayList<Data>();
-        for( Encoding.Relo r : relos ) {
-            if( r.readOnly()!=ro ) continue;
-            int align=1<<r._align;
-            int size=r._t instanceof TypeStruct ? (r._structSize+align-1)&-align : align;
-            data.add(new Data(r._t,r._t.str(),r._align,size));
-        }
-        return data;
-    }
-    @Override public ArrayList<Pool> pools(int codeEnd) {
-        var pools=new ArrayList<Pool>();
-        if( !encoded() ) return pools;
-        int base=(codeEnd+15)&-16;
-        if( _enc._cpool.size()>0 )
-            pools.add(new Pool("Constant Pool",_enc._cpool.buf(),0,base,objects(true)));
-        base=(base+_enc._cpool.size()+15)&-16;
-        if( _enc._sdata.size()>0 )
-            pools.add(new Pool("Static Data",_enc._sdata.buf(),0,base,objects(false)));
-        return pools;
-    }
-    private ArrayList<Data> objects(boolean ro) {
-        var data=new ArrayList<Data>();
-        for( var obj : _enc._data.entries() )
-            if( !obj.external && obj.readOnly==ro )
-                data.add(new Data(obj,obj.symbol+": "+obj.type.str(),obj.alignment,obj.size));
-        return data;
-    }
-    // Retain this diagnostic entry point for checking that pool printing never lays out types.
-    static int printConstantPool(int address, SB sb, BAOS bits, HashMap<Node,Encoding.Relo> relos,
-                                 boolean ro, String name) {
-        sb.p(com.seaofnodes.print.ASMPrinter.pool(new Pool(name,bits.buf(),0,address,entries(relos.values(),ro))));
-        return address+bits.size();
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/print/IRPrinter.java b/chapter-modules/src/main/java/com/seaofnodes/simple/print/IRPrinter.java
deleted file mode 100644
index 531a549a..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/print/IRPrinter.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package com.seaofnodes.simple.print;
-
-import com.seaofnodes.print.IRAdapter;
-import com.seaofnodes.simple.node.*;
-import java.util.ArrayList;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.codegen.CodeGen;
-
-/** This chapter's read-only IR facts and the familiar debugger entry points. */
-public final class IRPrinter extends IRAdapter<Node> {
-    private static final com.seaofnodes.print.IRPrinter<Node> PRINT =
-        new com.seaofnodes.print.IRPrinter<>(new IRPrinter());
-    @Override public boolean global(Node n) { return n.isConst(); }
-    @Override public String type(Node n) { return n._type==null ? "" : n._type.str(); }
-    @Override public String inputMark(Node n, Node def) { return n instanceof MemMergeNode && def instanceof MemMergeNode ? "^" : " "; }
-    @Override public Kind kind(Node n) {
-        if( n instanceof StartCUNode ) return Kind.UNIT;
-        if( n instanceof StopCUNode ) return Kind.UNIT;
-        if( n instanceof StartNode ) return Kind.START;
-        if( n instanceof StopNode ) return Kind.STOP;
-        if( n instanceof FunNode ) return Kind.FUN;
-        if( n instanceof LoopNode ) return Kind.LOOP;
-        if( n instanceof RegionNode ) return Kind.REGION;
-        if( n instanceof ParmNode ) return Kind.PARM;
-        if( n instanceof PhiNode ) return Kind.PHI;
-        if( n instanceof CallEndNode ) return Kind.CALL_END;
-        if( n instanceof CallNode ) return Kind.CALL;
-        if( n instanceof ReturnNode ) return Kind.RETURN;
-        if( n instanceof ConstantNode ) return Kind.CONSTANT;
-        if( n instanceof CProjNode ) return Kind.CPROJ;
-        if( n instanceof ProjNode ) return n instanceof CFGNode ? Kind.CPROJ : Kind.PROJ;
-        if( n instanceof CFGNode ) return Kind.CTRL;
-        if( n instanceof MultiNode ) return Kind.MULTI;
-        return Kind.DATA;
-    }
-    @Override public int index(Node n) {
-        if( n instanceof ProjNode p ) return p._idx;
-        if( n instanceof CProjNode p ) return p._idx;
-        return n._nid;
-    }
-    @Override public String functionName(Node n) { return ((FunNode)n)._name==null ? "" : ((FunNode)n)._name; }
-    @Override public String signature(Node n) {
-        FunNode fun=(FunNode)n;
-        return (fun._name==null ? "" : fun._name)+" "+fun.sig().str();
-    }
-
-    public static String prettyPrint(Node n, int depth) { return PRINT.prettyPrint(n,depth); }
-    public static SB printLine(Node n, SB sb) { return sb.p(PRINT.line(n)); }
-
-    public static String prettyPrint(CodeGen code) {
-        var units=new ArrayList<com.seaofnodes.print.IRPrinter.Unit<Node>>();
-        for( var cu : code._compunits.values() ) {
-            var funs=new ArrayList<Node>();
-            for( FunNode fun : code._linker )
-                if( fun!=null && fun._compunit==cu ) funs.add(fun);
-            units.add(new com.seaofnodes.print.IRPrinter.Unit<>(cu._cname,cu._start,cu._stop,funs));
-        }
-        return PRINT.program(code._start,code._stop,units);
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/print/SimpleGraphAdapter.java b/chapter-modules/src/main/java/com/seaofnodes/simple/print/SimpleGraphAdapter.java
deleted file mode 100644
index 9ca0ec51..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/print/SimpleGraphAdapter.java
+++ /dev/null
@@ -1,80 +0,0 @@
-package com.seaofnodes.simple.print;
-
-import com.seaofnodes.graph.GraphAdapter;
-import com.seaofnodes.graph.GraphSnapshot.*;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.node.*;
-import com.seaofnodes.simple.node.Node;
-import com.seaofnodes.simple.type.TypeMem;
-
-/** Chapter 25's view of the IR, including partially constructed parse-time graphs. */
-public class SimpleGraphAdapter extends GraphAdapter<Node> {
-
-    @Override protected boolean show(Node n) {
-        if( n != CodeGen.CODE.ZERO && n != CodeGen.CODE.XCTRL ) return true;
-        for( int i=0; i<n.nOuts(); i++ )
-            if( n.out(i) != null ) return true;
-        return false; // The parser's keep is not a graph use.
-    }
-
-    @Override protected String edgeName(Node n, int i) {
-        return n instanceof ScopeNode scope && i < scope._vars.size()
-                ? scope.var(i)._name : null;
-    }
-    @Override protected int edgeJump(Node n, int i) {
-        return n instanceof CallEndNode && i>0 && n.in(i) instanceof ReturnNode ret
-                ? ref(ret.fun()) : 0;
-    }
-    @Override protected int projectionIndex(Node n) { return n instanceof Proj p ? p.idx() : -1; }
-
-    @Override protected boolean folding(Node n) {
-        if( n instanceof FunNode fun ) return fun.folding();
-        if( n instanceof ReturnNode ret ) return ret.fun().folding();
-        if( n instanceof CallEndNode cend ) return cend.folding();
-        if( n instanceof CallNode )
-            for( int i=0; i<n.nOuts(); i++ )
-                if( n.out(i) instanceof CallEndNode cend && cend.folding() ) return true;
-        return false;
-    }
-
-    @Override protected Kind kind(Node n) {
-        if( n instanceof StopNode ) return Kind.STOP;
-        if( n instanceof ScopeNode ) return Kind.SCOPE;
-        if( n instanceof StartCUNode ) return Kind.UNIT;
-        if( n instanceof FunNode ) return Kind.FUN;
-        // Start inherits Loop for whole-program analysis, but is not a source loop.
-        if( n instanceof StartNode ) return Kind.START;
-        if( n instanceof LoopNode ) return Kind.LOOP;
-        if( n instanceof RegionNode ) return Kind.REGION;
-        if( n instanceof PhiNode ) return Kind.PHI;
-        if( n instanceof CFGNode ) return Kind.CTRL;
-        return isMem(n) ? Kind.MEM : Kind.DATA;
-    }
-
-    @Override protected Role role(Node n, int i) {
-        if( n instanceof ScopeNode || n instanceof ConstantNode || n instanceof FunPtrNode ||
-            n instanceof CtrlNode || n instanceof XCtrlNode )
-            return Role.ASSOC;
-        if( n instanceof PhiNode )
-            return i == 0 ? Role.ASSOC : isMem(n) ? Role.MEM : Role.DATA;
-        if( n instanceof Proj )
-            return n instanceof CFGNode ? Role.CTRL : isMem(n) ? Role.MEM : Role.DATA;
-        // StartCU inherits Region, but slot 0 really connects it to Start.
-        if( n instanceof StartCUNode && i == 0 ) return Role.CTRL;
-        if( n instanceof RegionNode && i == 0 ) return Role.ASSOC;
-        // Preserve known slot roles even when an input is not attached/typed yet.
-        if( i == 0 || n instanceof RegionNode || n instanceof StopNode ) return Role.CTRL;
-        if( n instanceof MemMergeNode ||
-            (i == 1 && (n instanceof MemOpNode || n instanceof ReturnNode || n instanceof CallNode)) ||
-            (n instanceof EscapeNode && i >= 2) ) return Role.MEM;
-        Node def = n.in(i);
-        if( def instanceof CFGNode ) return Role.CTRL;
-        if( def != null && isMem(def) ) return Role.MEM;
-        return Role.DATA;
-    }
-
-    private boolean isMem(Node n) {
-        // These Phi subclasses are memory even before their first type computation.
-        return n instanceof MemPhiNode || n instanceof BulkMemPhiNode || n.isMem() || n._type instanceof TypeMem;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/print/SimpleGraphObserver.java b/chapter-modules/src/main/java/com/seaofnodes/simple/print/SimpleGraphObserver.java
deleted file mode 100644
index f2ed2f72..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/print/SimpleGraphObserver.java
+++ /dev/null
@@ -1,35 +0,0 @@
-package com.seaofnodes.simple.print;
-
-import com.seaofnodes.graph.GraphCapture;
-import com.seaofnodes.graph.GraphViewer;
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.node.Node;
-import java.util.ArrayList;
-import java.io.IOException;
-
-/** Chapter 25's compilation context; capture and event bookkeeping are shared. */
-public class SimpleGraphObserver extends GraphCapture<Node> {
-    private CodeGen _code;
-    public SimpleGraphObserver() { super(new SimpleGraphAdapter()); }
-    public static void main(String[] args) throws IOException {
-        GraphViewer.run(new SimpleGraphObserver());
-    }
-    @Override protected void compile(String src) {
-        _code = new CodeGen(src);
-        _code._obs = this;
-        _code.driver(CodeGen.Phase.TypeCheck);
-    }
-    @Override protected String phase() { return _code._phase.name(); }
-    @Override protected int pos() { return _code._phase == CodeGen.Phase.Parse ? _code.P.pos() : -1; }
-    @Override protected void detach() {
-        if( _code != null ) _code._obs = null;
-        _code = null;
-    }
-    @Override protected Node scope() { return _code.P._scope; }
-    @Override protected void roots(ArrayList<Node> roots) {
-        roots.add(_code._stop);
-        if( _code._phase == CodeGen.Phase.Parse ) {
-            roots.addAll(_code.P._xScopes);
-        }
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/sys.java b/chapter-modules/src/main/java/com/seaofnodes/simple/sys.java
deleted file mode 100644
index 45106770..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/sys.java
+++ /dev/null
@@ -1,25 +0,0 @@
-package com.seaofnodes.simple;
-
-import java.io.IOException;
-import java.nio.file.Files;
-import java.nio.file.Path;
-
-
-/** Default included namespaces for Simple.
-
-    You can think of this as {@code #include <stdio.h>} for C or {@code import java.lang.*} for Java.
- */
-public abstract class sys {
-
-    public static final String SYS;
-
-    static {
-        try {
-            SYS = Files.readString(Path.of("src/main/smp/sys.smp"));
-        }
-        catch( Exception e ) {
-            throw new RuntimeException(e);
-        }
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/Field.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/Field.java
deleted file mode 100644
index ec4a588d..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/Field.java
+++ /dev/null
@@ -1,142 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.SB;
-import java.util.*;
-
-/**
- * Represents a field in a struct. This is not a Type in the type system.
- */
-public class Field extends Type {
-    static final Field[] EMPTY = new Field[0];
-
-    // The pair {fieldName,type} uniquely identifies a field.
-
-    // Field name
-    public String _fname;
-    // Type of the field
-    public Type _t;
-    // Unique memory alias, not sensibly part of a "type" but very convenient here.
-    public int _alias;
-    // Field is only written in the constructor
-    public boolean _final;
-    // Native C storage, outside the containing object's layout.
-    public boolean _extern;
-
-    private static final Ary<Field> FREE = new Ary<>(Field.class);
-    private Field(String fname, Type type, int alias, boolean xfinal, boolean external ) { super(TFLD); init(fname,type,alias,xfinal,external); }
-    private Field init(String fname, Type type, int alias, boolean xfinal, boolean external ) {
-        _fname = fname;
-        _t     = type;
-        _alias = alias;
-        _final = xfinal;
-        _extern = external;
-        return this;
-    }
-
-    // Return a filled-in Field; either from free list or alloc new.
-    private static Field malloc(String fname, Type type, int alias, boolean xfinal, boolean external ) {
-        return FREE.isEmpty() ? new Field(fname,type,alias,xfinal,external) : FREE.pop().init(fname,type,alias,xfinal,external);
-    }
-    // Malloc-from
-    public Field malloc( ) { return malloc(_fname,null,_alias,_final,_extern); }
-    @Override Field free(Type t) {
-        Field f = (Field)t;
-        assert !f.isFree() && !f._terned;
-        f._t    = null;
-        f._dual = null;
-        f._hash = 0;
-        FREE.push(f);
-        return this;
-    }
-    @Override boolean isFree() { return _t ==null; }
-
-    // Make and intern with listed fields
-    public static Field make( String fname, Type type, int alias, boolean xfinal ) {
-        return make(fname,type,alias,xfinal,false);
-    }
-    public static Field make( String fname, Type type, int alias, boolean xfinal, boolean external ) {
-        Field f = malloc(fname,type,alias,xfinal,external);
-        Field f2 = f.intern();
-        if( f2==f ) return f;
-        return VISIT.isEmpty() ? f2.free(f) : f2.delayFree(f);
-    }
-    public Field makeFrom( Type type ) {
-        return type == _t ? this : make(_fname,type,_alias,_final,_extern);
-    }
-    public Field makeFrom( boolean xfinal ) {
-        return xfinal == _final ? this : make(_fname,_t,_alias,xfinal,_extern);
-    }
-
-    // Cycle-making-breaking
-    void setType(Type t) { assert _t ==null; _t = t; }
-
-    public static final Field BOT   = make(" ",Type.BOTTOM,-999,false);
-    public static final Field TEST  = make("test",Type.NIL,-2,false);
-    public static final Field TEST2 = make("test",Type.NIL,-2,true);
-    public static final Field FLT   = make("flt ",TypeFloat.F32,-2,false);
-    public static final Field EXT   = make("test",TypeInteger.I32,-2,false,true);
-    public static void gather(ArrayList<Type> ts) { ts.add(TEST); ts.add(TEST2); ts.add(FLT); ts.add(EXT); }
-
-    @Override Field xmeet( Type that ) {
-        Field fld = (Field)that; // Invariant
-        if( this==BOT || fld==BOT ) return BOT;
-        if( this==BOT.dual() ) return fld ;
-        if( fld ==BOT.dual() ) return this;
-        if( _fname!=fld._fname ) { assert !_fname.equals(fld._fname); return BOT; }
-        assert _alias==fld._alias;
-        if( _extern!=fld._extern ) return BOT;
-        return make(_fname, _t.meet(fld._t ), _alias, _final | fld._final,_extern);
-    }
-
-    @Override
-    Field xdual() { return malloc(_fname, _t.dual(),_alias,!_final,_extern); }
-
-    @Override Field rdual() {
-        if( _dual!=null ) return dual();
-        assert !_terned;
-        Field d = malloc(_fname,null,_alias,!_final,_extern);
-        (_dual = d)._dual = this; // Cross link duals
-        d._t = _t._terned ? _t.dual() : _t.rdual();
-        return d;
-    }
-
-    @Override boolean _isConstant() { return _t._isConstant(); }
-    @Override boolean _isFinal() { return _final && _t._isFinal(); }
-    @Override Field _makeRO() { return _final ? this : make(_fname, _t._makeRO(),_alias,true,_extern);  }
-    @Override Field _close( String name, HashMap<String, Type> TYPES ) { return makeFrom( _t._close(name, TYPES )); }
-
-    @Override Type _upgradeType(HashMap<String,Type> TYPES) {
-        return makeFrom(_t._upgradeType(TYPES));
-    }
-
-    // Override in subclasses
-    int hash() { return _fname.hashCode() ^ _t.hashCode() ^ _alias ^ (_final ? 1024 : 0) ^ (_extern ? 2048 : 0); }
-
-    private boolean static_eq( Field f ) {
-        return _fname.equals(f._fname) && _alias==f._alias && _final==f._final && _extern==f._extern && _t !=null && f._t !=null;
-    }
-    @Override boolean eq( Type t ) {
-        Field f = (Field)t;
-        return static_eq(f) && _t ==f._t;
-    }
-    @Override boolean cycle_eq(Type t) {
-        if( this==t ) return true;
-        Field f = (Field)t;
-        return static_eq(f) && _t.cycle_eq(f._t );
-    }
-
-    @Override public int nkids() { return 1; }
-    @Override public Type at( int idx ) { return _t; }
-    @Override public void set( int idx, Type t ) { _t = t; }
-    // Tags: final/!final; +alias+name+external-storage flag
-
-
-    @Override
-    public SB _print( SB sb, BitSet visit, boolean html ) {
-        sb.p(_extern ? "extern C " : "").p(_final?"":"!").p(_fname).p(":").p(_alias).p(" : ");
-        return _t ==null ? sb.p("---") : _t.print(sb,visit,html);
-    }
-
-    @Override public String str() { return (_final?"":"!")+_fname; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/Type.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/Type.java
deleted file mode 100644
index 1979368e..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/Type.java
+++ /dev/null
@@ -1,548 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.*;
-import java.util.*;
-
-/**
- * These types are part of a Monotone Analysis Framework,
- * @see <a href="https://www.cse.psu.edu/~gxt29/teaching/cse597s21/slides/08monotoneFramework.pdf">see for example this set of slides</a>.
- * <p>
- * The types form a lattice; @see <a href="https://en.wikipedia.org/wiki/Lattice_(order)">a symmetric complete bounded (ranked) lattice.</a>
- * <p>
- * This wild lattice theory will be needed later to allow us to easily beef up
- * the analysis and optimization of the Simple compiler... but we don't need it
- * now, just know that it is coming along in a later Chapter.
- * <p>g
- * One of the fun things here is that while the theory is deep and subtle, the
- * actual implementation is darn near trivial and is generally really obvious
- * what we're doing with it.  Right now, it's just simple integer math to do
- * simple constant folding e.g. 1+2 == 3 stuff.
- */
-
-public class Type /*implements Cloneable*/ {
-    // Interning tables
-
-    // Main intern table; a collection of all unique types.
-    static final HashMap<Type,Type> INTERN = new HashMap<>();
-    // Starting intern table; used to rapidly reset the main table between tests
-    private static final HashMap<Type,Type> INTERN0= new HashMap<>();
-    // Lifetime management during cyclic installs is complex; this is used to
-    // track created-but-already-interned objects
-    private static final Ary<Type> FREES = new Ary<>(Type.class);
-    // "visit" bit management, based solely on _uid
-    static final BitSet BITS = new BitSet();
-
-    // "visit" bit management.  Key varies by kind of visit:
-
-    // - "close" an open cyclic type.  Used by the Parser, it will hit on
-    //   same-named structs, even if the structs have different states of
-    //   completion/fields.
-    // - "uid/name" - Either the UID or name works (unlike "close" which must
-    //   use the name).  Used to make cyclic copies with changes, like make
-    //   read-only where there should be only 1 copy of a name in a cycle.
-    // - "pair of uids" - For recursive MEET, where we need to key off two types
-    static final HashMap<Object,Type> VISIT = new HashMap<>();
-
-    // Every Type has a UID to allow visit bits on cyclic visits
-    private static int UID=1;
-    public char _uid;           // Unique ID for every type
-
-    // ----------------------------------------------------------
-    // Simple types are implemented fully here.  "Simple" means: the code and
-    // type hierarchy are simple, not that the Type is conceptually simple.
-    static final byte TBOT    = 0; // Bottom (ALL)
-    static final byte TTOP    = 1; // Top    (ANY)
-    static final byte TCTRL   = 2; // Ctrl flow bottom
-    static final byte TXCTRL  = 3; // Ctrl flow top (mini-lattice: any-xctrl-ctrl-all)
-    static final byte TNIL    = 4; // low null of all flavors
-    static final byte TXNIL   = 5; // high or choice null
-    static final byte TSIMPLE = 5; // End of the Simple Types
-
-    static final byte TSCALAR = 6; // Integer, float, memory pointer or function pointer
-    static final byte TPTR    = 7; // All nil-able pointer values
-    static final byte TINT    = 8; // All Integers; see TypeInteger
-    static final byte TFLT    = 9; // All Floats  ; see TypeFloat
-    static final byte TCONARY =10; // Constant array
-    static final byte TRPC    =11; // Return Program Control (Return PC or RPC)
-
-    static final byte TCYCLIC =12; // Has internal pointers, needs recursive treatment
-    static final byte TMEMPTR =12; // Memory pointer to a struct type
-    static final byte TFUNPTR =13; // Function pointer; unique signature and code address (just a bit)
-    static final byte TMEM    =14; // All memory (alias 0) or A slice of memory - with specific alias
-    static final byte TFLD    =15; // Named fields in structs
-    static final byte TSTRUCT =16; // Structs; tuples with named fields
-    static final byte TTUPLE  =17; // Tuples; finite collections of unrelated Types, kept in parallel
-
-    static final byte TMAX    =18;
-
-    // Basic RTTI, useful for a lot of fast tests.
-    public final byte _type;
-    public boolean _terned;
-
-    public boolean is_simple() { return _type <= TSIMPLE; }
-    public boolean is_nokids() { return _type < TCYCLIC; }
-    private static final String[] STRS = new String[]{"Bot","Top","Ctrl","~Ctrl","null","~nil"};
-    protected Type(byte type) {
-        _type = type;           // RTTI
-        _uid = (char)UID++;     // A unique ID for every type
-        if( UID > 32000 )
-            type = type;
-        assert _uid!=0;         // Overflow
-    }
-
-    public static final Type BOTTOM   = new Type( TBOT   ).intern(); // ALL
-    public static final Type TOP      = BOTTOM.dual();
-    public static final Type CONTROL  = new Type( TCTRL  ).intern(); // Ctrl
-    public static final Type XCONTROL = CONTROL.dual();
-    public static final Type NIL      = new Type( TNIL   ).intern(); // low null of all flavors
-    public static final Type XNIL     = NIL.dual();
-    public static Type[] gather() {
-        ArrayList<Type> ts = new ArrayList<>();
-        ts.add(BOTTOM);
-        ts.add(CONTROL);
-        ts.add(NIL);
-        TypeScalar.gather(ts);
-        TypeNil.gather(ts);
-        TypePtr.gather(ts);
-        TypeInteger.gather(ts);
-        TypeFloat.gather(ts);
-        TypeMemPtr.gather(ts);
-        TypeFunPtr.gather(ts);
-        TypeMem.gather(ts);
-        Field.gather(ts);
-        TypeStruct.gather(ts);
-        TypeTuple.gather(ts);
-        TypeRPC.gather(ts);
-        TypeConAry.gather(ts);
-
-        int sz = ts.size();
-        for( int i = 0; i < sz; i++ )
-            ts.add(ts.get(i).dual());
-        return ts.toArray(new Type[ts.size()]);
-    }
-
-    // Is high or on the lattice centerline.
-    public boolean isHigh       () { return _type==TTOP || _type==TXCTRL || _type==TXNIL; }
-    public boolean isHighOrConst() { return isHigh() || isConstant(); }
-
-    // ----------------------------------------------------------
-
-    // Notes on Type interning: At the moment it is not easy to reset the
-    // interned types because we hold static references to several types and
-    // these are scattered around.  This means the INTERN cache will retain all
-    // types from every run of the Parser.  For this to work correctly types
-    // must be rigorous about defining when they are the same.  Also types need
-    // to be immutable once defined.  The rationale for interning is
-    // *correctness* with cyclic type definitions.  Simple structural recursive
-    // checks go exponential with merely sharing, but with cycles they will
-    // stack overflow and crash.  Interning means we do not need to have sharing
-    // checks with every type compare, only during interning.
-
-    // Factory method which interns "this"
-    @SuppressWarnings("unchecked")
-    public <T extends Type> T intern() {
-        //assert check();
-        assert !_terned;        // Do not ask for already-interned
-        T t2 = (T)INTERN.get(this);
-        if( t2!=null ) {
-            assert t2._dual != null;  // Prior is complete with dual
-            assert this != t2;        // Do not hashcons twice, should not get self back
-            return t2;                // Return prior
-        }
-        // Mid recursive type construction
-        if( !VISIT.isEmpty() && _type >= TCYCLIC ) {
-            // No intern attempt at all
-            return (T)this;
-        }
-        // Not in type table
-        _dual = null;           // No dual yet
-        INTERN.put(this,this);  // Put in table without dual
-        _terned = true;
-        //Util.hash_quality_check_per(INTERN,"INTERN");
-        T d = xdual(); // Compute dual without requiring table lookup, and not setting name
-        _dual = d;
-        if( this==d ) return d; // Self-symmetric?  Dual is self
-        assert !equals(d);      // Self-symmetric is handled by caller
-        assert d._dual==null;   // Else dual-dual not computed yet
-        assert INTERN.get(d)==null;
-        d._dual = (T)this;
-        INTERN.put(d,d);        // Install dual also
-        d._terned = true;
-        //assert check();
-        return (T)this;
-    }
-
-    // Recursive visit elsewhere, interns with dual already
-    <T extends Type> T _intern() {
-        //assert check();
-        assert !_terned;
-        Type t = INTERN.get(this);
-        if( t!=null ) return (T)t.delayFree(this).delayFree(_dual);
-        assert !INTERN.containsKey( _dual );
-        INTERN.put(this,this);
-        INTERN.put(_dual,_dual);
-        _terned = _dual._terned = true;
-        //assert check();
-        return (T)this;
-    }
-
-    private static boolean check() {
-        for( Type t : INTERN.keySet() ) {
-            Type t2 = INTERN.get(t);
-            assert t==t2;
-        }
-        return true;
-    }
-
-    public static Type find(int uid) {
-        for( Type t : INTERN.keySet() )
-            if( t._uid==uid ) return t;
-        return null;
-    }
-
-
-    int _hash;          // Hash cache; not-zero when set.
-    @Override
-    public final int hashCode() {
-        if( _hash!=0 ) return _hash;
-        _hash = hash();
-        if( _hash==0 ) _hash = 0xDEADBEEF; // Bad hash from subclass; use some junk thing
-        return _hash;
-    }
-    // Override in subclasses
-    int hash() { return _type; }
-
-    @Override
-    public final boolean equals( Object o ) {
-        if( o==this ) return true;
-        if( !(o instanceof Type t)) return false;
-        if( _type != t._type ) return false;
-        return eq(t);
-    }
-    // Overridden in subclasses; subclass can assume "this!=t" and java classes are same
-    boolean       eq(Type t) { return this==t; }
-    boolean cycle_eq(Type t) { assert is_nokids(); return _type==t._type && eq(t); }
-    // A pair of uids
-    int pid( Type that ) {
-        return _uid < that._uid ? (_uid<<16 | that._uid) : (that._uid<<16 | _uid);
-    }
-
-    // At/Set child at 'idx' to t
-    public Type at( int idx ) { throw Utils.TODO("Should not reach here: type has no children"); }
-    public void set( int idx, Type t ) { throw Utils.TODO("Should not reach here: type has no children"); }
-    public int nkids() { return 0; }   // Number of kids
-
-
-    // Clear and re-insert the basic Type INTERN table
-    public static void reset() {
-        VISIT.clear();
-        FREES.clear();
-        if( INTERN0.isEmpty() ) {
-            // First time run all <clinit> and collect basic types
-            Type t = TypeRPC  .BOT; // Force class load, intern
-            Type u = TypeTuple.BOT; // Force class load, intern
-            Type w = TypePtr  .PTR; // Force class load, intern
-            INTERN0.putAll(INTERN);
-        } else {
-            // Later times, reset back to first time
-            VISIT.put(0,CONTROL); // Defeat assert
-            for( Iterator<Type> it = INTERN.keySet().iterator(); it.hasNext(); ) {
-                Type t = it.next();
-                if( !INTERN0.containsKey(t) )
-                    { t._terned=false; t.free(t); }
-                it.remove();
-            }
-            VISIT.clear();
-            INTERN.putAll(INTERN0);
-        }
-    }
-
-    // ----------------------------------------------------------
-    public final Type meet(Type t) {
-        assert _terned && t._terned;
-        // Shortcut for the self case
-        if( t == this ) return this;
-        // Same-type is always safe in the subclasses
-        if( _type==t._type ) return xmeet(t);
-        // TypeNil vs TypeNil meet
-        if( this instanceof TypeNil ptr0 && t instanceof TypeNil ptr1 )
-            return ptr0.nmeet(ptr1);
-        // Reverse; xmeet 2nd arg is never "is_simple" and never equal to "this".
-        if(   is_simple() ) return this.xmeet(t   );
-        if( t.is_simple() ) return t   .xmeet(this);
-        // TypeConAry meet its element type is OK
-        if( this instanceof TypeConAry tcon && t    instanceof TypeInteger ti ) return tcon.ymeet(ti);
-        if( t    instanceof TypeConAry tcon && this instanceof TypeInteger ti ) return tcon.ymeet(ti);
-        // Two distinct scalar families meet at the scalar envelope.
-        if( this instanceof TypeScalar scalar0 && t instanceof TypeScalar scalar1 )
-            return scalar0.smeet(scalar1);
-        // Mixing 2 unrelated types
-        return Type.BOTTOM;
-    }
-
-    // Compute meet right now.  Overridden in subclasses.
-    // Handle cases where 'this.is_simple()' and unequal to 't'.
-    // Subclassed xmeet calls can assert that '!t.is_simple()'.
-    Type xmeet(Type t) {
-        assert is_simple(); // Should be overridden in subclass
-        // ANY meet anything is thing; thing meet ALL is ALL
-        if( _type==TBOT || t._type==TTOP ) return this;
-        if( _type==TTOP || t._type==TBOT ) return    t;
-
-        // RHS TypeNil vs NIL/XNIL
-        if( _type==TNIL || _type==TXNIL ) {
-            if( t instanceof TypeNil ptr ) return _type==TNIL ? ptr.meet0() : ptr.meetX();
-            if( t instanceof TypeScalar scalar ) {
-                if( t._type==TSCALAR ) return t.isHigh() ? this : t;
-                return TypeScalar.BOT;
-            }
-            return t._type==(_type==TNIL ? TXNIL : TNIL) ? TypePtr.PTR : BOTTOM;
-        }
-
-        // 'this' is only {TCTRL,TXCTRL}
-        // Other non-simple RHS things bottom out
-        if( !t.is_simple() ) return BOTTOM;
-        // If RHS is NIL/XNIL
-        if( t._type==TNIL || t._type==TXNIL ) return BOTTOM;
-        // Both are {TCTRL,TXCTRL} and unequal to each other
-        return _type==TCTRL || t._type==TCTRL ? CONTROL : XCONTROL;
-    }
-
-
-    // The dual is pre-computed on creation and available "for free" thereafter
-    Type _dual;
-    public final <T extends Type> T dual() { return (T)_dual; }
-
-    <T extends Type> T xdual() {
-        return (T)new Type(switch( _type ) {
-            case TBOT  -> TTOP;
-            case TTOP  -> TBOT;
-            case TCTRL -> TXCTRL;
-            case TXCTRL-> TCTRL;
-            case TNIL  -> TXNIL;
-            case TXNIL -> TNIL;
-        default -> throw Utils.TODO("Should not reach here: unknown simple type");
-        });
-    }
-
-
-    // ----------------------------------------------------------
-    // Our lattice is defined with a MEET and a DUAL.
-    // JOIN is dual of meet of both duals.
-    public final Type join(Type t) {
-        if( this==t ) return this;
-        return dual().meet(t.dual()).dual();
-    }
-
-    // True if this "isa" t; e.g. 17 isa TypeInteger.BOT
-    public boolean isa( Type t ) { return meet(t)==t; }
-
-    public Type nonZero() { return this==NIL ? TypePtr.XNPTR : TypePtr.NPTR; }
-
-    // Make a zero version of this type, 0 for integers and null for pointers.
-    public Type makeZero() { return Type.NIL; }
-
-    // Cap at limits
-    public Type oob() { return isHigh() ? TOP : BOTTOM; }
-
-    // ----------------------------------------------------------
-
-    // Cyclic types!  Flag the start of a cyclic type by putting a sentinel in
-    // VISIT (and eventually clearing VISIT when done).  Then do a normal
-    // recursive descent visit of all types; this will accumulate types without
-    // interning them.  When done we have to visit the possibly cyclic type and
-    // intern the whole cycle, possibly hitting the entire cycle on a prior
-    // interned cycle.  Any sub-part might also be interned, including whole
-    // disjoint cycles.
-
-    // E.g. a new type: "A<->B -> C1<->D1" gets created; the "C1<->D1" cycle
-    // already exists as "C0<->D0", but the "A<->B" cycle is new.  The "A<->B"
-    // cycle will get interned - except the pointer to C1 needs to get replaced
-    // with C0.  The "C1<->D1" cycle gets freed and "B" will point to the
-    // "C0<->D0" cycle.
-
-    Type recurOpen() { assert VISIT.isEmpty(); VISIT.put(0L,BOTTOM); return this; }
-    Type recurClose() { return recurClose(null); }
-    Type recurClose(Type[] types) {
-        VISIT.remove(0L);       // Just ignore the sentinel
-        Ary<Type> ts = new Ary<>(Type.class);
-        ts.addAll(VISIT.values());
-        if( ts.find(this)== -1 ) ts.add(this);
-
-        // Pass #1: replace already interned fields
-        assert BITS.isEmpty();
-        for( int i=0; i<ts._len; i++ )
-            if( ts.at(i).tern()._terned )
-                ts.del(i--);
-        BITS.clear();
-
-        // Pass#2: compute recursive duals
-        for( Type t : ts )
-            t.rdual();
-
-        // Pass#3: Recursive install
-        for( Type t : ts )
-            if( !t._terned && INTERN.get(t)==null )
-                t.install();
-        // Upgrade the result
-        Type rez = INTERN.get(this);
-        assert rez!=null;
-        if( types!=null )
-            for( int i=0; i<types.length; i++ )
-                types[i] = INTERN.get(types[i]);
-
-        // Pass#4?: Free up any created-but-already interned
-        for( Type t : FREES )
-            t.rfree();
-        FREES.clear();
-        VISIT.clear();
-        return rez;
-    }
-
-    // Read-only recursive visits do not *make* cyclic types and so the cleanup
-    // is much easier.
-    static boolean recurClose(boolean rez) { VISIT.clear(); return rez; }
-
-    final Type tern() {
-        if( _terned ) return this;
-        if( !BITS.get(_uid) ) {
-            BITS.set(_uid);
-            int nkids = nkids();
-            for( int i=0; i<nkids; i++ )
-                set(i,at(i).tern());
-        }
-        Type told = INTERN.get(this);
-        return told==null ? this : told.delayFree(this);
-    }
-
-    // Recursive dual.  Visit all types recursively.  Each visited type is
-    // *new*, and hits in the intern table, or not.  If not, we recursively
-    // call rdual to get its dual, and cross-link the duals.  If hitting, we
-    // use the intern type and mark the prior type for freeing.
-    Type rdual() { assert !_terned; return xdual(); }
-
-    // Recursively free type and children
-    final void rfree() {
-        if( isFree() ) return;
-        int nkids = nkids();
-        for( int i=0; i<nkids; i++ )
-            if( !at(i)._terned )
-                at(i).rfree();
-        free(this);
-    }
-
-    Type free(Type free) {
-        return this;
-    }
-    boolean isFree() { return false; }
-
-    final <T extends Type> T delayFree(Type free) {
-        assert !free._terned;
-        FREES.push(free);
-        return (T)this;
-    }
-
-    final Type install() {
-        if( this instanceof TypeStruct ) {
-            Type x = _intern();     // Stop the recursion
-            if( x!=this ) return x.delayFree(this);
-        }
-        int nkids = nkids();
-        for( int i=0; i<nkids; i++ ) {
-            Type kid = at(i);
-            if( !kid._terned ) {
-                Type ikid = kid.install();
-                if( ikid != kid ) {
-                    set(i,ikid);
-                    _dual.set(i,ikid.dual());
-                }
-            }
-        }
-        return this instanceof TypeStruct || _terned ? this : _intern();
-    }
-
-    // Strict constant values, things on the lattice centerline.
-    // Excludes both high and low values
-    public final boolean isConstant() { return recurClose(recurOpen()._isConstant()); }
-    boolean _isConstant() { return _type==TNIL; }
-
-    // Are all reachable struct Fields are final?
-    // Writable array slots are invariant in their element access permissions.
-    // Otherwise an alias could insert a readonly pointer into a writable slot.
-    public boolean accessISA(Type dst) { return true; }
-
-    public final boolean isFinal() { return recurClose(recurOpen()._isFinal()); }
-    boolean _isFinal() { assert is_nokids(); return true; }
-
-    public final Type makeRO() {
-        if( isFinal() ) return this;
-        return recurOpen()._makeRO().recurClose();
-    }
-    Type _makeRO() { return this; }
-
-    /** Declared shape used when a value is published into mutable memory. */
-    public final Type makeStorage() {
-        return recurOpen()._makeStorage().recurClose();
-    }
-    Type _makeStorage() { assert is_simple(); return BOTTOM; }
-
-    // Bulk close-over all recursive types
-    public static TypeStruct[] closeOver(TypeStruct[] ts, HashMap<String,Type> TYPES) {
-        BOTTOM.recurOpen();
-        for( TypeStruct t : ts )
-            t._close(null, TYPES);
-        for( int i=0; i<ts.length; i++ ) {
-            // Parser only tracks the mutable name of arrays, so the closeOver
-            // returns that one.  However, internal types might have immutable
-            // versions.
-            String name = ts[i].isAry() ? (ts[i]._name+"!").intern() : ts[i]._name;
-            ts[i] = (TypeStruct)VISIT.get(name);
-        }
-        BOTTOM.recurClose(ts);
-        return ts;
-    }
-
-    Type _close( String name, HashMap<String, Type> TYPES ) { return this; }
-    public Type widen() { return this; }
-
-    // Replace recursively all TypeBuilders with cyclic TypeStructs
-    public Type upgradeType(HashMap<String,Type> TYPES) {
-        return recurOpen()._upgradeType(TYPES).recurClose();
-    }
-    Type _upgradeType(HashMap<String,Type> TYPES) { assert is_nokids(); return this;  }
-
-
-    // ----------------------------------------------------------
-
-    // Size in bits to hold an instance of this type.
-    // Sizes are expected to be between 1 and 64 bits.
-    // Size 0 means this either takes no space (such as a known-zero field)
-    // or isn't a scalar to be stored in memory.
-    public int log_size () { return 3; } // log-size of a type; log_size for a struct is usually undefined
-    public int size() { return 1<<log_size(); }
-    public int alignment() { return log_size(); } // alignment; for structs, max align of Fields
-
-    // ----------------------------------------------------------
-    // Useful in the debugger, which calls toString everywhere.
-    // This is a more verbose dev-friendly print.
-    @Override
-    public final String toString() {
-        return print(new SB(), new BitSet(), false).toString();
-    }
-    public final String gprint() {
-        return print(new SB(), new BitSet(), true).toString();
-    }
-    public final SB  print(SB sb) { return print(sb, new BitSet(), false); }
-    public final SB gprint(SB sb) { return print(sb, new BitSet(), true ); }
-
-    // Used during recursive printing, or combined with SB Node printing
-    public final SB print(SB sb, BitSet visit, boolean html ) {
-        if( visit.get(_uid) ) return sb.p(str());
-        visit.set(_uid);
-        return _print(sb,visit,html);
-    }
-    SB _print(SB sb, BitSet visit, boolean html ) { return sb.p(str()); }
-
-    // This is used by error messages, and is a shorted print.
-    public String str() { return STRS[_type]; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeConAry.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeConAry.java
deleted file mode 100644
index 860cefc5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeConAry.java
+++ /dev/null
@@ -1,80 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.BAOS;
-import com.seaofnodes.simple.util.Utils;
-import java.util.ArrayList;
-import java.util.HashMap;
-
-/**
- * Represents a constant array of primitives
- */
-public abstract class TypeConAry<A> extends TypeScalar {
-    boolean _any;
-    byte _widen;
-    // One of byte or int array
-    public final A _ary;
-
-    TypeConAry( boolean any, byte widen, A ary ) { super(TCONARY); _any = any; _widen = widen; _ary = ary; }
-    public static void gather(ArrayList<Type> ts) {
-        ts.add(TypeConAryB.ABC);
-        ts.add(TypeConAryB.ABCD);
-        ts.add(TypeConAryI.I123);
-    }
-    // Fresh, uninterned type sharing this array; xdual must not intern.
-    abstract TypeConAry<A> _make(boolean any, byte widen);
-
-    @Override TypeConAry<A> xdual() { return _make( !_any, (byte)(3-_widen) ); }
-
-    @Override Type xmeet(Type t) {
-        TypeConAry ary = (TypeConAry)t; // Invariant
-        // Same base array but different?
-        if( _equals(ary) )
-            // Return array with larger widen
-            return _widen >= ary._widen ? this : ary;
-        // Unrelated constant arrays, falls to some int range
-        return elem().meet(ary.elem());
-    }
-
-    Type ymeet( TypeInteger ti ) {
-        // if i can isa *each* element, then maybe can keep.
-        // no good to i.isa(elem()) because fails the dual
-        for( int j=0; j<len(); j++ )
-            if( !ti.isa(TypeInteger.make(at8(j),at8(j),ti._widen)) )
-                return ti.meet(elem());
-        byte widen = (byte)Math.max(_widen,ti._widen);
-        return widen==_widen ? this : _make(_any,widen).intern();
-    }
-
-    private boolean _equals(TypeConAry ary) {
-        int len = len();
-        if( len != ary.len() ) return false;
-        for( int i=0; i<len; i++ )
-            if( at8(i) != ary.at8(i) )
-                return false;
-        return true;
-    }
-
-    @Override public boolean isHigh() { return this==TOP; }
-    @Override boolean _isConstant() { return true; }
-    @Override Type _makeStorage() { return this; }
-
-    // Meet-over-elements type
-    public Type elem() {
-        if( _ary==null )
-            return _any ? Type.TOP : BOTTOM;
-        int len = len();
-        long min = Long.MAX_VALUE;
-        long max = Long.MIN_VALUE;
-        for( int i=0; i<len; i++ ) {
-            min = Math.min(min,at8(i));
-            max = Math.max(max,at8(i));
-        }
-        return TypeInteger.make(min,max,_widen);
-    }
-    public abstract long at8(int idx);
-    public abstract int len();
-    @Override public abstract int log_size();
-
-
-    public void write( BAOS baos ) { throw Utils.TODO("Should not reach here: abstract constant array cannot be written"); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeConAryB.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeConAryB.java
deleted file mode 100644
index bddcb1fb..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeConAryB.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.BAOS;
-import java.util.Arrays;
-
-public class TypeConAryB extends TypeConAry<byte[]> {
-    private TypeConAryB(boolean any, byte widen, byte[] bs) { super(any,widen,bs); }
-    @Override TypeConAryB _make( boolean any, byte widen ) { return new TypeConAryB(any,widen,_ary); }
-    public static TypeConAryB make( byte[] bs ) { return new TypeConAryB(false,(byte)0,bs).intern(); }
-    public static TypeConAryB make( String s ) { return make(s.getBytes()); }
-    static final TypeConAryB ABC  = make("abc");
-    static final TypeConAryB ABCD = make("abcd");
-    @Override public long at8(int idx) { return _ary[idx]; }
-    @Override public int len() { return _ary.length; }
-    @Override public int log_size() { return 0; }
-    @Override public String str() { return "[\""+new String(_ary)+"\"]"; }
-    @Override boolean eq(Type t) { return t instanceof TypeConAryB ary && _widen==ary._widen && Arrays.equals(_ary,ary._ary); }
-    @Override int hash() { return Arrays.hashCode(_ary); }
-
-    @Override public void write( BAOS baos ) { baos.write(_ary); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeConAryI.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeConAryI.java
deleted file mode 100644
index b1b061de..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeConAryI.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import java.util.Arrays;
-
-public class TypeConAryI extends TypeConAry<int[]> {
-    private TypeConAryI(boolean any, byte widen, int[] bs) { super(any,widen,bs); }
-    public static TypeConAryI make( int[] bs ) { return new TypeConAryI(false,(byte)0,bs).intern(); }
-    @Override TypeConAryI _make( boolean any, byte widen ) { return new TypeConAryI(any,widen,_ary); }
-    static final TypeConAryI I123 = make(new int[]{1,2,3});
-    @Override public long at8(int idx) { return _ary[idx]; }
-    @Override public int len() { return _ary.length; }
-    @Override public int log_size() { return 2; }
-    @Override public String str() { return "[i32]"; }
-    @Override boolean eq(Type t) { return t instanceof TypeConAryI ary && _widen==ary._widen && Arrays.equals(_ary,ary._ary); }
-    @Override int hash() { return Arrays.hashCode(_ary); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeFloat.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeFloat.java
deleted file mode 100644
index 8638b8c9..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeFloat.java
+++ /dev/null
@@ -1,111 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.AryInt;
-import com.seaofnodes.simple.util.Utils;
-import java.util.ArrayList;
-import java.util.HashMap;
-
-/**
- * Float Type
- */
-public class TypeFloat extends TypeScalar {
-
-    // - high -64, high -32, con 0, low +32, low +64
-    public byte _sz;
-
-    /**
-     * The constant value or 0
-     */
-    public double _con;
-
-    private static final Ary<TypeFloat> FREE = new Ary<>(TypeFloat.class);
-    private TypeFloat(byte sz, double con) { super(TFLT); init(sz,con); }
-    private TypeFloat init( byte sz, double con ) { _sz = sz; _con = con; return this; }
-    public static TypeFloat malloc(byte sz, double con) { return FREE.isEmpty() ? new TypeFloat(sz,con) : FREE.pop().init(sz,con); }
-    private static TypeFloat make(int sz, double con) {
-        TypeFloat f  = malloc((byte)sz,con);
-        TypeFloat t2 = f.intern();
-        return t2==f ? f : t2.free(f);
-    }
-    @Override TypeFloat free(Type t) {
-        TypeFloat f = (TypeFloat)t;
-        f._hash = 0;
-        f._dual=null;
-        FREE.push(f);
-        return this;
-    }
-
-    public static TypeFloat constant(double con) { return make(0, con); }
-
-    public final static TypeFloat ONE = constant(1.0);
-    public final static TypeFloat FZERO = constant(0.0);
-    public final static TypeFloat F32 = make(32, 0);
-    public final static TypeFloat F64 = make(64, 0);
-
-    public static void gather(ArrayList<Type> ts) { ts.add(F64); ts.add(F32); ts.add(constant(3.141592653589793)); }
-
-    @Override public String str() {
-        return switch( _sz ) {
-        case -64 -> "~flt";
-        case -32 -> "~f32";
-        case   0 -> ""+_con+((float)_con==_con ? "f" : "");
-        case  32 ->  "f32";
-        case  64 ->  "flt";
-        default  -> throw Utils.TODO("Should not reach here: unknown float size");
-        };
-    }
-    private boolean isF32() { return ((float)_con)==_con; }
-
-    @Override public boolean isHigh    () { return _sz< 0; }
-    @Override public int log_size() { return _sz==32 || _sz==-32 ? 2 : 3; }
-
-    public double value() { return _con; }
-
-    @Override
-    public TypeFloat xmeet(Type other) {
-        TypeFloat f = (TypeFloat)other;
-        // Invariant from caller: 'this' != 'other' and same class (TypeFloat).
-        TypeFloat i = (TypeFloat)other; // Contract
-        // Larger size in i1, smaller in i0
-        TypeFloat i0 = _sz < i._sz ? this : i;
-        TypeFloat i1 = _sz < i._sz ? i : this;
-
-        if( i1._sz== 64 ) return F64;
-        if( i0._sz==-64 ) return i1;
-        if( i1._sz== 32 )
-            return i0._sz==0 && !i0.isF32() ? F64 : F32;
-        if( i1._sz!=  0 ) return i1;
-        // i1 is a constant
-        if( i0._sz==-32 )
-            return i1.isF32() ? i1 : F64;
-        // Since both are constants, and are never equals (contract) unequals
-        // constants fall to bottom
-        return i0.isF32() && i1.isF32() ? F32 : F64;
-    }
-
-    @Override
-    TypeFloat xdual() {
-        return _isConstant() ? this : new TypeFloat((byte)-_sz,0); // Constants are a self-dual
-    }
-
-    @Override boolean _isConstant() { return _sz==0; }
-
-    @Override Type _makeStorage() {
-        if( _isConstant() ) return isF32() ? F32 : F64;
-        return isHigh() ? dual() : this;
-    }
-
-    @Override public Type makeZero() { return FZERO; }
-
-
-    @Override
-    int hash() { return (int)(Double.hashCode(_con) ^ _sz ^ (1<<17)); }
-    @Override
-    public boolean eq( Type t ) {
-        TypeFloat i = (TypeFloat)t; // Contract
-        // Allow NaN to check for equality
-        return _sz==i._sz && Double.doubleToLongBits(_con)==Double.doubleToLongBits(i._con);
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeFunPtr.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeFunPtr.java
deleted file mode 100644
index 301fcc8b..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeFunPtr.java
+++ /dev/null
@@ -1,313 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.*;
-import java.util.*;
-
-/**
- * Represents a Pointer to a function.
- * <p></p>
- * Functions have argument types and a return type, making a function
- * signature.  Within a signature there can be many instances of functions, and
- * each function is labeled with a small integer constant.  A TFP can represent
- * a single signature and a set of functions; the set might contain only 1
- * function or the zeroth function (the null ptr).
- * <p></p>
- * Functions with different signatures cannot be mixed, and will result in a
- * bottom function type, which can only be null-checked.
- */
-public class TypeFunPtr extends TypeNil {
-    // A TypeFunPtr is Signature and a set of functions.
-    public Type[] _sig;
-    public Type _ret;
-    boolean _open;              // Extra args are true:scalar BOT, false:scalar TOP
-    // Set of functions.  Bit zero is used for mutable/immutable safety.  Sign
-    // bit repeats infinitely.
-    public int[] _fidxs;
-
-    private static final Ary<TypeFunPtr> FREE = new Ary<>(TypeFunPtr.class);
-    private TypeFunPtr(byte nil) { super(TFUNPTR,nil); }
-    private TypeFunPtr init(byte nil, boolean open, Type[] sig, Type ret, int[] fidxs ) {
-        assert sig != null;
-        _nil  = nil;
-        _open = open;
-        _sig  = sig;
-        _ret  = ret;
-        assert _fidxs == null;
-        _fidxs= XInt.intern(fidxs);
-        return this;
-    }
-    static TypeFunPtr malloc( byte nil, boolean open, Type[] sig, Type ret, int[] fidxs ) {
-        return (FREE.isEmpty() ? new TypeFunPtr(nil) : FREE.pop()).init(nil,open,sig,ret,fidxs);
-    }
-    @Override TypeFunPtr free(Type t) {
-        TypeFunPtr fun = (TypeFunPtr)t;
-        assert !fun.isFree() && !fun._terned;
-        fun._sig = null;
-        fun._ret = null;
-        fun._dual = null;
-        fun._hash = 0;
-        fun._fidxs = null;
-        FREE.push(fun);
-        return this;
-    }
-    @Override boolean isFree() { return _sig==null; }
-
-    // All fields directly listed
-    public static TypeFunPtr make( byte nil, boolean open, Type[] sig, Type ret, int[] fidxs ) {
-        TypeFunPtr fun = malloc(nil,open,sig,ret,fidxs);
-        TypeFunPtr f2  = fun.intern();
-        if( f2==fun ) return fun;
-        return VISIT.isEmpty() ? f2.free(fun) : f2.delayFree(fun);
-    }
-    // Trim trailing args which match the default.
-    private static TypeFunPtr makeAdjusted( byte nil, boolean open, Type[] sig, Type ret, int[] fidxs ) {
-        Type def = open ? TypeScalar.BOT : TypeScalar.TOP;
-        int nargs = sig.length;
-        while( nargs > 0 && sig[nargs-1] == def )
-            nargs--;
-        if( nargs != sig.length )
-            sig = nargs == 0 ? ARG_EMPTY : Arrays.copyOf(sig,nargs);
-        return make(nil,open,sig,ret,fidxs);
-    }
-    public static TypeFunPtr make( boolean nil, Type[] sig, Type ret ) { return makeAdjusted((byte)(nil ? 3 : 2),true,sig,ret, XInt.FULL); }
-    public static TypeFunPtr make1( byte nil, boolean open, Type[] sig, Type ret, int fidx ) {
-        return makeAdjusted(nil,open,sig,ret,XInt.make(fidx));
-    }
-
-
-    @Override TypeFunPtr makeFrom( byte nil ) { return  nil ==_nil ? this : make(  nil,_open,_sig,_ret, _fidxs); }
-    public    TypeFunPtr makeFrom( Type ret ) { return  ret ==_ret ? this : make( _nil,_open,_sig, ret, _fidxs); }
-    public    TypeFunPtr makeFrom( int fidx ) { return make1(_nil,_open,_sig,_ret,fidx); }
-    public    TypeFunPtr makeFrom( Type arg, int idx ) {
-        // Alter named arg
-        Type[] sig = _sig.clone();
-        sig[idx] = arg;
-        return make(_nil,_open,sig,_ret,_fidxs);
-    }
-    @Override public Type nonZero() { return makeFrom((byte)(_nil <= 1 ? 1 : 2)); }
-
-    public static final Type[] TEMPTY = new Type[0];
-    static final Type[] TINT    = new Type[]{TypeInteger.BOT};
-    static final Type[] TINTMEM = new Type[]{TypeInteger.BOT,TypeFloat.F32};
-    static final Type[] TINTINT = new Type[]{TypeInteger.BOT,TypeInteger.BOT};
-    public static TypeFunPtr BOT   = make((byte)3,true,TEMPTY,Type.BOTTOM, XInt.FULL);
-    public static TypeFunPtr TEST  = make((byte)2,true,TINTMEM,TypeInteger.BOT, XInt.SET1);
-    public static TypeFunPtr TEST0 = make((byte)3,true,TINTMEM,TypeInteger.BOT, XInt.SET3);
-    public static TypeFunPtr MAIN  = make((byte)3,true,TINT   ,Type.BOTTOM, XInt.FULL); // Main can return anything
-    public static TypeFunPtr CALLOC= make((byte)3,true,TINTINT,TypeMemPtr .BOT, XInt.FULL);
-    public static void gather(ArrayList<Type> ts) {
-        ts.add(TEST);
-        ts.add(TEST0);
-        ts.add(BOT);
-        ts.add(MAIN);
-        ts.add(CALLOC);
-        ts.add(make((byte)2,false,TINT,TypeInteger.I32, XInt.SET1));
-        ts.add(make((byte)2,true ,TINT,TypeInteger.BOT, XInt.SET3));
-        ts.add(make1((byte)2,true,
-                     new Type[]{TypeInteger.BOT},
-                     TypeInteger.BOT, 65));
-        ts.add(make1((byte)2,true,
-                     new Type[]{TypeInteger.BOT, TypeScalar.BOT},
-                     TypeInteger.BOT, 65));
-        // Explicit trailing defaults must agree with the implicit argument tail.
-        for( boolean open : new boolean[]{false,true} ) {
-            Type def = open ? TypeScalar.BOT : TypeScalar.TOP;
-            ts.add(make1((byte)2,open,TINT,TypeInteger.I32,1));
-            ts.add(make1((byte)2,open,new Type[]{TypeInteger.BOT,def,def},TypeInteger.I32,1));
-            ts.add(make1((byte)2,open,new Type[]{def,def},TypeInteger.I32,1));
-            ts.add(make1((byte)2,open,new Type[]{def,TypeInteger.BOT},TypeInteger.I32,1));
-        }
-    }
-
-    private static final Type[] ARG_EMPTY = new Type[0];
-    @Override
-    Type xmeet(Type t) {
-        TypeFunPtr that = (TypeFunPtr) t;
-        boolean open = _open | that._open;
-        Type def0 = this._open ? TypeScalar.BOT : TypeScalar.TOP;
-        Type def1 = that._open ? TypeScalar.BOT : TypeScalar.TOP;
-        Type def  =       open ? TypeScalar.BOT : TypeScalar.TOP;
-
-        int nargs = Math.max(_sig.length,that._sig.length);
-        Type[] args = new Type[nargs];
-
-        for( int i=0; i<nargs; i++ ) {
-            Type t0 = i < this._sig.length ? this._sig[i] : def0;
-            Type t1 = i < that._sig.length ? that._sig[i] : def1;
-            args[i] = t0.meet(t1);
-        }
-
-        while( nargs>0 && args[nargs-1] == def )
-            nargs--;
-
-        if( nargs != args.length )
-            args = nargs == 0 ? ARG_EMPTY : Arrays.copyOf(args,nargs);
-
-        return make(xmeet0(that), open, args, _ret.meet(that._ret), XInt.meet(_fidxs,that._fidxs));
-    }
-
-    static Type[] xmeet( Type[] ts0, Type[] ts1) {
-        if( ts0==ts1 ) return ts0;
-        assert ts0.length==ts1.length;
-        Type[] ts = new Type[ts0.length];
-        for( int i=0; i<ts0.length; i++ )
-            ts[i] = ts0[i].meet(ts1[i]);
-        return ts;
-    }
-
-    @Override TypeFunPtr xdual() { return malloc(dual0(), !_open, xdual(_sig), _ret.dual(), XInt.dual(_fidxs)); }
-    static Type[] xdual(Type[] ts) {
-        Type[] dual = new Type[ts.length];
-        for( int i=0; i<ts.length; i++ )
-            dual[i] = ts[i].dual();
-        return dual;
-    }
-
-    @Override TypeFunPtr rdual() {
-        if( _dual!=null ) return dual();
-        assert !_terned;
-        Type[] sigs = new Type[_sig.length];
-        TypeFunPtr d = malloc(dual0(),!_open,sigs,null, XInt.dual(_fidxs));
-        (_dual = d)._dual = this; // Cross link duals
-        // Return rdual
-        d._ret = _ret._terned ? _ret.dual() : _ret.rdual();
-        // Signature rdual
-        for( int i=0; i<_sig.length; i++ )
-            sigs[i] = _sig[i]._terned ? _sig[i].dual() : _sig[i].rdual();
-        return d;
-    }
-
-    // RHS is NIL; deep-dual when crossing the centerline
-    @Override public Type meet0() {
-        if( _nil==3 ) return this;
-        if( _nil==2 ) return make((byte)3,_open,_sig,_ret,_fidxs);
-
-        return make((byte)3,_open,_sig,_ret,_fidxs);
-    }
-
-    @Override public boolean isHigh() { return _nil <= 1 || (_nil==2 && _fidxs== XInt.EMPTY); }
-
-    @Override public boolean _isConstant() { return (_nil==2 && XInt.isConstant(_fidxs)) || (_nil==3 && _fidxs== XInt.EMPTY); }
-
-    @Override boolean _isFinal() { return true; }
-    @Override TypeFunPtr _makeStorage() { return this; }
-
-    @Override TypeFunPtr _close( String name, HashMap<String, Type> TYPES ) {
-        Type[] sig = new Type[_sig.length];
-        TypeFunPtr fun = malloc(_nil,true,sig,null,_fidxs);
-        // Now start the recursion
-        fun._ret = _ret._close(name, TYPES );
-        for( int i=0; i<sig.length; i++ )
-            sig[i] = _sig[i]._close(name, TYPES );
-        return fun;
-    }
-
-    // Replace recursively all TypeBuilders with cyclic TypeStructs
-    @Override Type _upgradeType(HashMap<String,Type> TYPES) {
-        Type[] sig = new Type[_sig.length];
-        TypeFunPtr fun = malloc(_nil,_open,sig,null,_fidxs);
-        // Now start the recursion
-        fun._ret = _ret._upgradeType(TYPES);
-        for( int i=0; i<sig.length; i++ )
-            sig[i] = _sig[i]._upgradeType(TYPES);
-        return fun;
-    }
-
-    @Override public int log_size() { return 2; } // (1<<2)==4-byte pointers
-
-    public Type arg(int i) { return _sig[i]; }
-    public int[] fidxs() { return _fidxs; }
-    public Type ret() { return _ret; }
-    public int nargs() { return _sig.length; }
-    public int fidx() { return XInt.onlyBit(_fidxs); }
-    public int nfcns() {
-        if( XInt.isHigh(_fidxs) ) return Integer.MAX_VALUE; // Infinite choices
-        return XInt.bitCount(_fidxs);
-    }
-
-
-    // Used to walk over type structures
-    @Override public int nkids() { return _sig.length+1; }
-    @Override public Type at( int idx ) {
-        return idx == _sig.length ? _ret : _sig[idx];
-    }
-    @Override public void set( int idx, Type t ) {
-        if( idx == _sig.length ) _ret = t;
-        else _sig[idx] = t;
-    }
-
-
-    @Override
-    int hash() {
-        long hash = _ret.hashCode() ^ XInt.hash(_fidxs) ^ super.hash();
-        for( Type arg : _sig )
-            hash = hash*19 ^ arg.hashCode();
-        return Utils.fold(hash);
-    }
-
-    @Override
-    boolean eq(Type t) {
-        // Recursive; so use cyclic equals
-        if( !VISIT.isEmpty() ) {
-            assert TypeStruct.CEQUALS.isEmpty();
-            boolean rez = cycle_eq(t);
-            TypeStruct.CEQUALS.clear();
-            return rez;
-        }
-        TypeFunPtr fun = (TypeFunPtr)t; // Invariant
-        if( !super.eq(fun) || _open != fun._open || _fidxs != fun._fidxs || _sig.length != fun._sig.length ) return false;
-        if( _sig == fun._sig && _ret == fun._ret ) return true;
-
-        if( !_ret.eq(fun._ret) ) return false;
-        for( int i = 0; i < _sig.length; i++ )
-            if( !_sig[i].eq(fun._sig[i]) )
-                return false;
-        return true;
-    }
-    @Override boolean cycle_eq(Type t) {
-        if( t._type != TFUNPTR ) return false;
-        TypeFunPtr fun = (TypeFunPtr)t; // Invariant
-        if( !super.eq(fun) || _open != fun._open || _fidxs != fun._fidxs || _sig.length != fun._sig.length ) return false;
-        if( _sig == fun._sig && _ret == fun._ret ) return true;
-
-        // Check to see if we've ever compared this pair of types before;
-        // if so, then assume the cycle is equal here.
-        int pid = pid(fun);
-        if( TypeStruct.CEQUALS.find(pid)!= -1 ) return true;
-        TypeStruct.CEQUALS.push(pid);
-        if( !_ret.cycle_eq(fun._ret) ) return false;
-        for( int i = 0; i < _sig.length; i++ )
-            if( !_sig[i].cycle_eq(fun._sig[i]) )
-                return false;
-        return true;
-    }
-
-    @Override public String str() {
-        if( this==BOT ) return "FunBot";
-        if( this==BOT.dual() ) return "FunTop";
-        return "{"+printFIDX()+"}";
-    }
-
-    @Override
-    SB _print(SB sb, BitSet visit, boolean html ) {
-        if( this==BOT ) return sb.p("FunBot");
-        if( this==BOT.dual() ) return sb.p("FunTop");
-        sb.p(x()).p("{ ");
-        if( _sig!=null )
-            for( Type t : _sig )
-                sb.p(t==null ? "---" : t.str()).p(" "); // Short form in signature
-        if( !_open ) sb.p("^ ");
-        _ret.print(sb.p(html ? "&rarr; " : "-> "),visit,html).p(" #");
-        // Print fidxs
-        return sb.p(printFIDX()).p("}").p(q());
-    }
-    String printFIDX() {
-        String tilde = isHigh() ? "~" : "";
-        String fidx = XInt.str(_fidxs);
-        return tilde+fidx;
-    }
-
-    // Usage: for( long fidxs=fidxs(); fidxs!=0; fidxs=nextFIDX(fidxs) ) { int fidx = Long.numberOfTrailingZeros(fidxs); ... }
-    //public static long nextFIDX(long fidxs) { return fidxs & (fidxs-1); }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeInteger.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeInteger.java
deleted file mode 100644
index a2cf08b0..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeInteger.java
+++ /dev/null
@@ -1,185 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.AryInt;
-import com.seaofnodes.simple.util.Utils;
-import java.util.ArrayList;
-import java.util.HashMap;
-
-/**
- * Integer Type
- */
-public class TypeInteger extends TypeScalar {
-    /**
-     * Describes an integer *range* - everything from min to max; both min and
-     * max are inclusive.  If min==max, this is a constant.
-     * <br>
-     * If min <= max, this is a  below center (towards bottom).
-     * If min >  max, this is an above center (towards top).
-     */
-    public long _min, _max;
-
-    public byte _widen;
-
-    private static final Ary<TypeInteger> FREE = new Ary<>(TypeInteger.class);
-    private TypeInteger(long min, long max, byte widen) { super(TINT); init(min,max,widen); }
-    private TypeInteger init(long min, long max, byte widen) {
-        _min = min; _max = max; _widen=widen;
-        return this;
-    }
-    public static TypeInteger malloc(long lo, long hi, byte widen) { return FREE.isEmpty() ? new TypeInteger(lo,hi,widen) : FREE.pop().init(lo,hi,widen); }
-    public static TypeInteger make(long lo, long hi) { return make(lo,hi,(byte)0); }
-    public static TypeInteger make(long lo, long hi, byte widen) {
-        TypeInteger i = malloc(lo,hi,widen);
-        TypeInteger t2 = i.intern();
-        return t2==i ? i : t2.free(i);
-    }
-    public TypeInteger makeWide(byte widen) {
-        if( widen == _widen ) return this;
-        if( _min == Long.MIN_VALUE && _max == Long.MAX_VALUE )
-            return TypeInteger.BOT;
-        if( _min==_max ) return this; // Leave constants always narrow
-        return make(_min,_max,widen);
-    }
-    @Override TypeInteger free(Type t) {
-        TypeInteger i = (TypeInteger)t;
-        i._min = i._max = 0;
-        i._widen = 0;
-        i._hash = 0;
-        i._dual = null;
-        FREE.push(i);
-        return this;
-    }
-
-    public Type same_but_slightly_wider_than( ) {
-        return _widen < 3 ? make(_min,_max, (byte)(_widen+1)) : BOT;
-    }
-    // Force max widen
-    @Override public Type widen() {
-        return _widen==3 ? this : make(_min,_max,(byte)3);
-    }
-    public static TypeInteger constant(long con) { return make(con, con); }
-
-    public final static TypeInteger ZERO= make(0,0);
-    public final static TypeInteger FALSE=ZERO;
-    public final static TypeInteger TRUE= make(1,1);
-    public final static TypeInteger TWO = make(2,2); // Shows up in some Simple tests as the starting argument
-
-    public final static TypeInteger I1  = make(-1,0,(byte)3);
-    public final static TypeInteger I8  = make(-128,127,(byte)3);
-    public final static TypeInteger I16 = make(-32768,32767,(byte)3);
-    public final static TypeInteger I32 = make(-1L<<31,(1L<<31)-1,(byte)3);
-    public final static TypeInteger BOT = make(Long.MIN_VALUE,Long.MAX_VALUE,(byte)3);
-    public final static TypeInteger TOP = (TypeInteger)BOT.dual();
-
-    public final static TypeInteger U1  = make(0,1,(byte)3);
-    public final static TypeInteger BOOL= U1;
-    public final static TypeInteger U8  = make(0,255,(byte)3);
-    public final static TypeInteger U16 = make(0,65535,(byte)3);
-    public final static TypeInteger U32 = make(0,(1L<<32)-1,(byte)3);
-
-    public final static TypeInteger FATBOOL = make(0,1,(byte)2);
-
-    public static void gather(ArrayList<Type> ts) {
-        ts.add(I32); ts.add(BOT); ts.add(U1); ts.add(I1); ts.add(U8); ts.add(ZERO); ts.add(FATBOOL);
-        // Ranges before and after excluding zero, at each widening level.
-        for( byte widen=0; widen<=3; widen++ ) {
-            ts.add(make(0,255,widen));
-            ts.add(make(1,255,widen));
-            ts.add(make(-255,0,widen));
-            ts.add(make(-255,-1,widen));
-        }
-    }
-
-    @Override public String str() {
-        if( _isConstant() ) return ""+_min;
-        long lo = _min, hi = _max;
-        String x = "";
-        if( hi < lo ) {
-            lo = _max;  hi = _min;
-            x = "~";
-        }
-        return x+_str(lo,hi);
-    }
-    private static String _str(long lo, long hi) {
-        if( lo==Long.MIN_VALUE && hi==Long.MAX_VALUE ) return "i64";
-        if( lo==       0 && hi==         1 ) return "bool";
-        if( lo==      -1 && hi==         0 ) return "i1";
-        if( lo==    -128 && hi==       127 ) return "i8";
-        if( lo==  -32768 && hi==     32767 ) return "i16";
-        if( lo== -1L<<31 && hi==(1L<<31)-1 ) return "i32";
-        if( lo==       0 && hi==      255  ) return "u8";
-        if( lo==       0 && hi==     65535 ) return "u16";
-        if( lo==       0 && hi==(1L<<32)-1 ) return "u32";
-        return "["+lo+"-"+hi+"]";
-    }
-
-    @Override public boolean isHigh    () { return _min >  _max; }
-
-    @Override public int log_size() {
-        if( isHigh() ) return 0; // High types are dead, and should never hit code emission.
-        if( this==I8  || this==U8 || this==BOOL ) return 0; // 1<<0 == 1 bytes
-        if( this==I16 || this==U16              ) return 1; // 1<<1 == 2 bytes
-        if( this==I32 || this==U32              ) return 2; // 1<<2 == 4 bytes
-        if( this==BOT                           ) return 3; // 1<<3 == 8 bytes
-        if( _isConstant() ) return log(_min);                // just const here
-        int lo = log(_min);
-        int hi = log(_max);
-        return Math.max(lo,hi);
-    }
-
-    private static int log(long x) {
-        if(      -0xFFL <= x && x <=       0xFFL) return 0;
-        if(    -0xFFFFL <= x && x <=     0xFFFFL) return 1;
-        if(-0xFFFFFFFFL <= x && x <= 0xFFFFFFFFL) return 2;
-        return 3;
-    }
-
-    public long value() { assert _isConstant(); return _min; }
-
-    // AND-mask of forced zeros.  e.g. unsigned types will return their mask;
-    // u8 will return 0xFF.  But also a range of 16-18 (0x10-0x12) will return
-    // 0x13 - no value in the range {16,17,18} will allow bit 0x04 to be set.
-    public long mask() {
-        if( isHigh() ) return 0;
-        if( isConstant() ) return _min;
-        // Those bit positions which differ min to max
-        long x = _min ^ _max;
-        // Highest '1' bit in the differ set.  Since the range is from min to
-        // max, all values below here are possible.
-        long ff1 = Long.highestOneBit(x);
-        // Make a all-1's mask from ff1, and set over the same bits (either min
-        // or max is ok).
-        long mask = _min | (ff1-1) | ff1;
-        return mask;
-    }
-
-    @Override
-    public Type xmeet(Type other) {
-        // Invariant from caller: 'this' != 'other' and same class (TypeInteger)
-        TypeInteger i = (TypeInteger)other; // Contract
-        return make(Math.min(_min,i._min), Math.max(_max,i._max), (byte)Math.max(_widen,i._widen));
-    }
-
-    @Override TypeInteger xdual() {  return malloc(_max,_min,(byte)(3-_widen));  }
-
-    @Override public TypeInteger nonZero() {
-        if( isHigh() ) return this;
-        if( this==ZERO ) return null;                  // No sane answer
-        if( _min==0 ) return make(1,Math.max(_max,1),_widen); // specifically good on BOOL
-        if( _max==0 ) return make(_min,-1,_widen);
-        return this;
-    }
-    @Override public Type makeZero() { return ZERO; }
-    @Override boolean _isConstant() { return _min == _max; }
-    @Override Type _makeStorage() {
-        if( _isConstant() ) return BOT;
-        return isHigh() ? dual() : this;
-    }
-
-
-    @Override int hash() { return Utils.fold(_min) * Utils.fold(_max) + _widen; }
-    @Override public boolean eq( Type t ) {
-        return t instanceof TypeInteger i && _min==i._min && _max==i._max && _widen==i._widen;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeMem.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeMem.java
deleted file mode 100644
index 4234a5e5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeMem.java
+++ /dev/null
@@ -1,229 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.*;
-import java.util.ArrayList;
-import java.util.BitSet;
-import java.util.HashMap;
-
-
-/**
- * Represents a slice of memory corresponding to a set of aliases
- */
-public class TypeMem extends Type {
-
-    // Which slice of memory?
-    //  1 and TOP means no slice.
-    //  1 and BOT means all memory.
-    //  N means alias slice#N.
-    public int _alias;
-    public Type _t;       // Memory contents, some scalar type
-    public boolean _one;  // Singleton memory, corresponding to TypeMemPtr._one.
-    public boolean _clz;  // Class-object singleton memory; true singletons stay constant after construction.
-    public boolean _final;// Memory is only set in the constructor
-
-    // Escaped aliases and functions - escaped into this memory.  These are
-    // reachable from some chain of indirections from `_t`.  Bit zero is
-    // used for mutable/immutable safety.  Sign bit repeats infinitely.
-    public int[] _escFs;
-    public int[] _escAs;
-
-    static public int CNT;
-
-    private static final Ary<TypeMem> FREE = new Ary<>(TypeMem.class);
-
-    private TypeMem() { super(TMEM); CNT++; }
-    private TypeMem init(int alias, Type t, boolean one, boolean clz, boolean xfinal, int[] fidxs, int[] aliases) {
-        _alias = alias;
-        _t = t;
-        _one = one;
-        _clz = clz;
-        // Public bulk memory is an aggregate of otherwise-unsplit aliases;
-        // a single final bit cannot describe it.  Keep the lattice-dual high
-        // form distinct, and retain finality for private singleton memory and
-        // precise alias slices.
-        _final = t!=null && alias==1 && !one && !t.isHigh() ? false : xfinal;
-
-        assert _escFs == null && _escAs == null;
-        _escFs = XInt.intern(fidxs);
-        _escAs = XInt.intern(aliases);
-        return this;
-    }
-    @Override TypeMem free(Type t) {
-        TypeMem mem = (TypeMem)t;
-        mem._alias= -99;
-        mem._dual = null;
-        mem._hash = 0;
-        mem._t = null;
-        mem._one = false;
-        mem._clz = false;
-        mem._final = false;
-        mem._escFs = null;
-        mem._escAs = null;
-        FREE.push(mem);
-        return this;
-    }
-    @Override boolean isFree() { return _alias == -99; }
-
-    public static TypeMem malloc(int alias, Type t, boolean one, boolean clz, boolean xfinal, int[] fidxs, int[] aliases) {
-        return (FREE.isEmpty() ? new TypeMem() : FREE.pop()).init(alias,t,one,clz,xfinal,fidxs,aliases);
-    }
-    public static TypeMem make(int alias, Type t, boolean one, boolean clz, boolean xfinal, int[] fidxs, int[] aliases) {
-        if( fidxs  ==null ) fidxs  = XInt.EMPTY;
-        if( aliases==null ) aliases= XInt.EMPTY;
-        TypeMem f = malloc(alias,t,one,clz,xfinal, fidxs, aliases);
-        TypeMem f2 = f.intern();
-        if( f2==f ) return f;
-        return VISIT.isEmpty() ? f2.free(f) : f2.delayFree(f);
-    }
-    public static TypeMem make(int alias, Type t) { return make(alias,t,false,false,false,null,null); }
-    // Make a private memory
-    public static TypeMem makePrivate(Type t) { return make(1,t,true,false,false,escapeFIDX(XInt.EMPTY,t), escapeAlias(XInt.EMPTY,t)); }
-
-    public TypeMem makeFrom(int alias) { return make(alias,_t,_one,_clz,_final,_escFs,_escAs); }
-    public TypeMem makeFrom(int[] fidxes, int[] aliases) {
-        return make(_alias,_t,_one,_clz,_final,fidxes,aliases);
-    }
-    // Existing escapes plus `t` escapes
-    public TypeMem escapes(Type t) {
-        return make(_alias,_t,_one,_clz,_final, escapeFIDX(_escFs,t), escapeAlias(_escAs,t));
-    }
-    // Existing escapes plus `t` escapes
-    public TypeMem escapesFrom(Type t) {
-        return make(_alias,_t,_one,_clz,_final, escapeFIDX(_escFs,t), escapeAlias(_escAs,t));
-    }
-    public TypeMem escapesAliases(Type t) {
-        return make(_alias,_t,_one,_clz,_final, _escFs, escapeAlias(_escAs,t));
-    }
-
-    public static final TypeMem TOP = make(1, Type.TOP   ,true ,true, true , XInt.EMPTY, XInt.EMPTY);
-    public static final TypeMem BOT = make(1, Type.BOTTOM,false,false,true , XInt.FULL , XInt.FULL );
-    public static final TypeMem START= make(1,Type.BOTTOM,false,false,false, XInt.EMPTY, XInt.EMPTY);
-    public static final TypeMem SELF_MEM = make(1, TypeStruct.BOT);
-
-    public static void gather(ArrayList<Type> ts) {
-        ts.add(make(2,Type.NIL));
-        ts.add(make(2,TypeInteger.ZERO));
-        ts.add(BOT);
-        ts.add(SELF_MEM);
-        ts.add(START);
-        ts.add(make(2,TypeInteger.ZERO,true,false,true,XInt.EMPTY,XInt.make(2)));
-        ts.add(make(2,TypeInteger.BOT,false,false,false,XInt.EMPTY,XInt.FULL));
-    }
-
-    @Override
-    TypeMem xmeet(Type t) {
-        TypeMem that = (TypeMem) t; // Invariant: TypeMem and unequal
-        if( this==TOP ) return that;
-        if( that==TOP ) return this;
-        if( this==BOT ) return BOT;
-        if( that==BOT ) return BOT;
-        // Treat a alias-1 has either very-high or very-low, according to "_t"
-        int alias = _alias==that._alias ? _alias // Same-same
-            : this._alias==1 && this._t.isHigh() ? that._alias // this is high-1 alias, so take that
-            : that._alias==1 && that._t.isHigh() ? this._alias // that is high-1 alias, so take this
-            : 1;
-        Type mt = _t.meet(that._t);
-        int[] fidxs  = XInt.meet( _escFs, that._escFs );
-        int[] aliases= XInt.meet( _escAs, that._escAs );
-        // Singleton and class facts are kept only when both sides agree.
-        // Finality is a low-side fact, and flips on the dual side.
-        boolean highAlias1 = (this._alias==1 && this._t.isHigh()) || (that._alias==1 && that._t.isHigh());
-        boolean xfinal = highAlias1 ? (_final & that._final) : (_final | that._final);
-        return make(alias, mt, _one & that._one, _clz & that._clz, xfinal, fidxs, aliases);
-    }
-
-    @Override
-    Type xdual() { return malloc(_alias,_t.dual(),!_one,!_clz,!_final, XInt.dual(_escFs), XInt.dual(_escAs)); }
-
-    @Override TypeMem rdual() {
-        if( _dual!=null ) return dual();
-        assert !_terned;
-        TypeMem d = malloc(_alias,null,!_one,!_clz,!_final, XInt.dual(_escFs), XInt.dual(_escAs));
-        (_dual = d)._dual = this; // Cross link duals
-        d._t = _t._terned ? _t.dual() : _t.rdual();
-        if( d._alias==1 && !d._one ) { assert !d._t.isHigh(); d._final = false; }
-        return d;
-    }
-
-    @Override public TypeMem makeZero() { return TOP; }
-    @Override public boolean isHigh() { return _t.isHigh(); }
-    @Override boolean _isConstant() { return _one && _clz && _alias!= 1 && _t._isConstant(); }
-    @Override public int log_size() { throw Utils.TODO("Should not reach here: memory has no scalar storage size"); }
-    @Override boolean _isFinal() { throw Utils.TODO("Should not reach here"); }
-    @Override TypeMem _makeStorage() { throw Utils.TODO("Should not reach here"); /*return make(_alias,_t._makeStorage(),_one,_clz,_final,_escFs,_escAs);*/ }
-
-    @Override TypeMem _close( String name, HashMap<String, Type> TYPES ) { return malloc(_alias,_t._close(name, TYPES ),_one,_clz,_final,_escFs,_escAs); }
-
-    @Override Type _upgradeType(HashMap<String,Type> TYPES) {
-        return make(_alias,_t._upgradeType(TYPES),_one,_clz,_final,_escFs,_escAs);
-    }
-
-    @Override int hash() { return 9876543 + _alias + _t.hashCode() + (_one ? 8196 : 0) + (_clz ? 4098 : 0) + (_final ? 16392 : 0) + XInt.hash(_escFs) + XInt.hash(_escAs); }
-
-    @Override boolean eq(Type t) {
-        TypeMem that = (TypeMem) t; // Invariant
-        return _alias == that._alias && _t == that._t && _one == that._one && _clz == that._clz && _final == that._final && _escFs == that._escFs && _escAs == that._escAs;
-    }
-
-    @Override boolean cycle_eq(Type t) {
-        TypeMem that = (TypeMem) t; // Invariant
-        return _alias == that._alias && _one == that._one && _clz == that._clz && _final == that._final && _escFs == that._escFs && _escAs == that._escAs && _t.cycle_eq(that._t);
-    }
-
-    @Override public int nkids() { return 1; }
-    @Override public Type at( int idx ) { return _t; }
-    @Override public void set( int idx, Type t ) { _t = t; }
-
-
-    @Override public SB _print(SB sb, BitSet visit, boolean html) {
-        if( this==BOT ) return sb.p("MemBot");
-        if( this==TOP ) return sb.p("MemTop");
-        sb.p('#');
-        if( !_final ) sb.p('!'); // Mutable memory
-        if( _one ) sb.p(_clz ? 'z' : '-');
-        if( _alias==0 ) return sb.p(_t._type==TTOP ? "TOP" : "BOT");
-        sb.p(_alias).p(":[");
-        _t.print(sb,visit,html).p(",");
-        XInt.str(sb,_escFs).p(",");
-        return XInt.str(sb,_escAs).p("]");
-    }
-
-    @Override public String str() {
-        if( this==BOT ) return "MemBot";
-        if( this==TOP ) return "MemTop";
-        SB sb = new SB().p('#');
-        if( !_final ) sb.p('!'); // Mutable memory
-        if( _one ) sb.p(_clz ? 'z' : '-');
-        if( _alias==0 ) return sb.p(_t._type==TTOP ? "TOP" : "BOT").toString();
-        sb.p(_alias).p(":[").p(_t.str()).p(",");
-        XInt.str(sb,_escFs).p(",");
-        return XInt.str(sb,_escAs).p("]").toString();
-    }
-
-
-    // Tracking bulk escaped aliases and fidxs
-
-    // Escape all FIDXs from t
-    private static int[] escapeFIDX( int[] xs, Type t ) {
-        return switch(t) {
-        case TypeMemPtr tmp -> escapeFIDX(xs,tmp._obj);
-        case TypeStruct ts  -> ts._open && !ts.isAry()
-                ? XInt.FULL         // Open structs can have any fields
-                : XInt.meet(xs,ts.fidxs());
-        case TypeFunPtr tfp -> XInt.meet(xs,tfp.fidxs());
-        case TypeMem    mem -> XInt.meet(xs,mem._escFs);
-        case Type tt -> tt == BOTTOM ? XInt.FULL : xs;
-        };
-    }
-
-    private static int[] escapeAlias( int[] xs, Type t ) {
-        return switch(t) {
-        case TypeMemPtr tmp -> escapeAlias(xs,tmp._obj);
-        case TypeStruct ts  -> ts._open && !ts.isAry()
-            ? XInt.FULL         // Open structs can have any fields
-            : XInt.meet(xs,ts.aliases());
-        case TypeMem    mem -> XInt.meet(xs,mem._escAs);
-        case Type tt -> tt == BOTTOM ? XInt.FULL : xs;
-        };
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeMemPtr.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeMemPtr.java
deleted file mode 100644
index 73ca6190..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeMemPtr.java
+++ /dev/null
@@ -1,179 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.Ary;
-import com.seaofnodes.simple.util.AryInt;
-import com.seaofnodes.simple.util.SB;
-import java.util.*;
-
-/**
- * Represents a Pointer to memory.
- *
- * Null is generic pointer to non-existent memory.
- * *void is a non-Null pointer to all possible refs, both structs and arrays.
- * Pointers can be to specific struct and array types, or a union with Null.
- * The distinguished *$BOT ptr represents union of *void and Null.
- * The distinguished *$TOP ptr represents the dual of *$BOT.
- */
-public class TypeMemPtr extends TypeNil {
-    // A TypeMemPtr is pair (obj,nil)
-    // where obj is a TypeStruct, possibly TypeStruct.BOT/TOP
-    // where nil is an explicit null is allowed or not
-
-    // Examples:
-    // (Person,false) - a not-nil Person
-    // (Person,true ) - a Person or a nil
-    // (BOT   ,false) - a not-nil void* (unspecified struct)
-    // (TOP   ,true ) - a nil
-
-    public TypeStruct _obj;
-    // Deep read-only access through this pointer; independent of slot finality.
-    public boolean _ro;
-
-    public boolean _one;      // Singleton pointer value; the pointer itself is constant.
-    public boolean _pub;      // Escaped/public pointer.  False means constructor-private.
-
-    private static final Ary<TypeMemPtr> FREE = new Ary<>(TypeMemPtr.class);
-    private TypeMemPtr(byte nil, TypeStruct obj, boolean one, boolean pub) { super(TMEMPTR,nil); init(nil,obj,one,pub); }
-    private TypeMemPtr init(byte nil, TypeStruct obj, boolean one, boolean pub) { _nil=nil; _obj=obj; _ro=obj==TypeStruct.BOT; _one=one; _pub=pub; return this; }
-    // Return a filled-in TypeMemPtr; either from free list or alloc new.
-    static TypeMemPtr malloc(byte nil, TypeStruct obj, boolean one, boolean pub) {
-        return FREE.isEmpty() ? new TypeMemPtr(nil,obj,one,pub) : FREE.pop().init(nil,obj,one,pub);
-    }
-
-    // All fields directly listed
-    public static TypeMemPtr make(byte nil, TypeStruct obj, boolean one) {
-        return make(nil,obj,one,true);
-    }
-    public static TypeMemPtr make(byte nil, TypeStruct obj, boolean one, boolean pub) {
-        return make(nil,obj,one, pub,obj==TypeStruct.BOT);
-    }
-    private static TypeMemPtr make(byte nil, TypeStruct obj, boolean one, boolean pub, boolean ro) {
-        TypeMemPtr tmp = malloc(nil, obj, one, pub).access(ro);
-        TypeMemPtr t2 = tmp.intern();
-        if( t2==tmp ) return tmp;
-        return VISIT.isEmpty() ? t2.free(tmp) : t2.delayFree(tmp);
-    }
-    @Override TypeMemPtr free(Type t) {
-        TypeMemPtr tmp = (TypeMemPtr)t;
-        tmp._nil  = -99;
-        tmp._obj  = null;
-        tmp._one  = false;
-        tmp._pub = true;
-        tmp._dual = null;
-        tmp._hash = 0;
-        FREE.push(tmp);
-        return this;
-    }
-    @Override boolean isFree() { return _obj==null; }
-
-    static TypeMemPtr make(byte nil, TypeStruct obj) { return make(nil, obj, false); }
-    public static TypeMemPtr make        (TypeStruct obj) { return make((byte)2, obj); }
-    public static TypeMemPtr makeNullable(TypeStruct obj) { return make((byte)3, obj); }
-    public static TypeMemPtr makePrivate (TypeStruct obj) { return make((byte)2, obj, false, false); }
-
-    public TypeMemPtr makeFrom(TypeStruct obj) { return obj==_obj ? this : make(_nil, obj, _one, _pub,_ro); }
-    public TypeMemPtr makeNullable() { return makeFrom((byte)3); }
-    /** Inferred mutable local: nullable, public and non-singleton. */
-    public TypeMemPtr makeVar() { return (TypeMemPtr)makeStorage(); }
-    /** Public-memory shape: nullable and non-singleton, preserving the referent. */
-    @Override TypeMemPtr _makeStorage() { return make(_nil,_obj._makeStorage(),false,true,_ro); }
-    @Override TypeMemPtr makeFrom(byte nil) { return nil==_nil ? this : make(nil, _obj, _one, _pub,_ro); }
-    @Override public Type nonZero() { return makeFrom((byte)(_nil <= 1 ? 1 : 2)); }
-
-    private TypeMemPtr access(boolean ro) { _ro=ro; return this; }
-
-    public TypeMemPtr withAccess(boolean ro) {
-        if( _ro==ro ) return this;
-        TypeMemPtr ptr = malloc(_nil, _obj, _one, _pub);
-        ptr._ro = ro;
-        TypeMemPtr res = ptr.intern();
-        if( res==ptr ) return ptr;
-        return VISIT.isEmpty() ? res.free(ptr) : res.delayFree(ptr);
-    }
-
-    // Writable slots can load and store references, so their element access
-    // must agree in both directions. A read-only outer view can weaken access.
-    @Override public boolean accessISA(Type dst) {
-        if( !(dst instanceof TypeMemPtr ptr) ) return true;
-        if( _ro && !ptr._ro ) return false;
-        if( ptr._ro || _obj._fields==null || ptr._obj._fields==null || !_obj.isAry() || !ptr._obj.isAry() ) return true;
-        Type a = _obj._fields[1]._t, b = ptr._obj._fields[1]._t;
-        return a.accessISA(b) && b.accessISA(a);
-    }
-
-    // An abstract pointer, pointing to either a Struct or an Array.
-    // Can also be null or not, so 4 choices {TOP,BOT} x {nil,not}
-    public static final TypeMemPtr BOT = make((byte)3, TypeStruct.BOT);
-    public static final TypeMemPtr TOP = BOT.dual();
-    public static final TypeMemPtr NOTBOT = make((byte)2,TypeStruct.BOT);
-
-    public static final TypeMemPtr TEST= make((byte)2, TypeStruct.TEST);
-    public static void gather(ArrayList<Type> ts) { ts.add(NOTBOT); ts.add(BOT); ts.add(TEST); ts.add(TEST.makeRO()); }
-
-    @Override
-    public TypeNil xmeet(Type t) {
-        TypeMemPtr that = (TypeMemPtr) t;
-        assert !isFree() && !that.isFree();
-        // Can't keep _one if mixing two unequal singletons; the result is not
-        // either singleton.  Once either side is public, the meet is public.
-        boolean one = _one && that._one && (_obj==that._obj || !(_obj.isConAry() || that._obj.isConAry()));
-        return make(xmeet0(that), (TypeStruct)_obj.meet(that._obj), one, _pub | that._pub,_ro | that._ro);
-    }
-
-    @Override
-    TypeMemPtr xdual() { return malloc( dual0(), _obj.dual(), !_one, !_pub).access(!_ro); }
-
-    @Override TypeMemPtr rdual() {
-        if( _dual!=null ) return dual();
-        assert !_terned;
-        TypeMemPtr d = malloc(dual0(), null, !_one, !_pub).access(!_ro);
-        (_dual = d)._dual = this; // Cross link duals
-        d._obj = _obj._terned ? _obj.dual() : _obj.rdual();
-        return d;
-    }
-
-    // RHS is NIL; do not deep-dual when crossing the center line
-    @Override Type meet0() { return _nil==3 ? this : make((byte)3,_obj,false,true,_ro); }
-
-    @Override boolean _isConstant() { return _one; }
-    @Override boolean _isFinal() { return _ro; }
-    @Override TypeMemPtr _makeRO() { return withAccess(true); }
-    @Override TypeMemPtr _close( String name, HashMap<String, Type> TYPES ) { return malloc(_nil,_obj._close(name, TYPES ),_one,_pub).access(_ro); }
-
-    @Override Type _upgradeType(HashMap<String,Type> TYPES) {
-        return makeFrom((TypeStruct)_obj._upgradeType(TYPES));
-    }
-
-    @Override public int log_size() { return 3; } // (1<<3)==8-byte pointers
-
-    @Override int hash() { return (_ro ? 8192 : 0) ^ _obj.hashCode() ^ super.hash() ^ (_one ? 2048 : 0) ^ (_pub ? 4096 : 0); }
-
-    @Override boolean eq(Type t) {
-        TypeMemPtr ptr = (TypeMemPtr)t; // Invariant
-        return _ro==ptr._ro && super.eq(ptr) && _one == ptr._one && _pub == ptr._pub && _obj == ptr._obj;
-    }
-    @Override boolean cycle_eq(Type t) {
-        if( t._type != TMEMPTR ) return false;
-        TypeMemPtr ptr = (TypeMemPtr)t; // Invariant
-        return _ro==ptr._ro && super.eq(ptr) && _one == ptr._one && _pub == ptr._pub && _obj.cycle_eq(ptr._obj);
-    }
-
-    @Override public int nkids() { return 1; }
-    @Override public Type at( int idx ) { return _obj; }
-    @Override public void set( int idx, Type t ) { _obj = (TypeStruct)t; }
-
-
-    @Override public String str() {
-        if( this==BOT ) return "PtrBot";
-        if( this==TOP ) return "PtrTop";
-        if( this== NOTBOT) return "*void";
-        return x()+"*"+(_obj==null?"---":_obj.str())+q();
-    }
-
-    @Override SB _print(SB sb, BitSet visit, boolean html ) {
-        if( this==BOT ) return sb.p("PtrBot");
-        if( this==TOP ) return sb.p("PtrTop");
-        if( this== NOTBOT) return sb.p("*void");
-        return _obj.print(sb.p(x()).p("*"),visit,html).p(q());
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeNil.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeNil.java
deleted file mode 100644
index 2c1c1d76..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeNil.java
+++ /dev/null
@@ -1,61 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-import java.util.ArrayList;
-
-/**
- * Nil-able Scalar types
- */
-public abstract class TypeNil extends TypeScalar {
-    // 0 = high-subclass choice nil
-    // 1 = high-subclass no nil
-    // 2 = low -subclass no nil
-    // 3 = low -subclass also nil
-    byte _nil;
-
-    TypeNil(byte t, byte nil ) { super(t); _nil = nil; }
-
-    public static void gather(ArrayList<Type> ts) { }
-
-    abstract TypeNil makeFrom(byte nil);
-
-    byte xmeet0(TypeNil that) { return (byte)Math.max(_nil,that._nil); }
-
-    byte dual0() { return (byte)(3-_nil); }
-
-    // RHS is NIL
-    abstract Type meet0();
-
-    // RHS is XNIL
-    Type meetX() {
-        return _nil==0 ? XNIL : (_nil<=2 ? TypePtr.NPTR : TypePtr.PTR);
-    }
-
-    Type nmeet(TypeNil tn) {
-        // Invariants: both are TypeNil subclasses and unequal classes.
-        // If this is TypePtr, we went to TypePtr.nmeet and not here.
-        // If that is TypePtr, this is not (invariant); reverse and go again.
-        if( tn instanceof TypePtr ts ) return ts.nmeet(this);
-
-        // Two mismatched TypeNil, no Scalar.
-        if( _nil==0 && tn._nil==0 ) return XNIL;
-        if( _nil<=2 && tn._nil<=2 ) return TypePtr.NPTR;
-        return TypePtr.PTR;
-    }
-
-    @Override public boolean isHigh       () { return _nil <= 1; }
-    @Override public boolean isHighOrConst() { return isHigh() || isConstant(); }
-
-    public boolean notNull() { return _nil==1 || _nil==2; }
-    public boolean nullable() { return _nil==3; }
-
-    @Override boolean _isConstant() { return false; }
-
-    final String q() { return _nil == 1 || _nil == 2 ? "" : "?"; }
-    final String x() { return isHigh() ? "~" : ""; }
-
-    int hash() { return _nil<<17; }
-
-    @Override boolean eq(Type ptr) { return ptr instanceof TypeNil nil && _nil ==nil._nil; }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypePtr.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypePtr.java
deleted file mode 100644
index 7e9e70e4..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypePtr.java
+++ /dev/null
@@ -1,57 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.AryInt;
-import com.seaofnodes.simple.util.SB;
-import com.seaofnodes.simple.util.Utils;
-import java.util.ArrayList;
-import java.util.BitSet;
-import java.util.HashMap;
-
-/**
- * Represents a Scalar; a single register-sized value.
- */
-public class TypePtr extends TypeNil {
-    private static final String[] STRS = new String[]{"~ptr","~nptr","nptr","ptr"};
-
-    private TypePtr(byte nil) { super(TPTR,nil);  }
-
-    // An abstract pointer, pointing to either a Struct or an Array.
-    // Can also be null or not, so 4 choices {TOP,BOT} x {nil,not}
-    public static TypePtr XPTR = new TypePtr((byte)0).intern();
-    public static TypePtr XNPTR= new TypePtr((byte)1).intern();
-    public static TypePtr NPTR = (TypePtr)XNPTR.dual();
-    public static TypePtr PTR  = (TypePtr)XPTR.dual();
-    private static final TypePtr[] PTRS = new TypePtr[]{XPTR,XNPTR,NPTR,PTR};
-
-    public static void gather(ArrayList<Type> ts) { ts.add(PTR); ts.add(NPTR); }
-
-    TypeNil makeFrom(byte nil) { throw Utils.TODO("Should not reach here: plain pointer nil state is canonical"); }
-
-    @Override public TypeNil xmeet(Type t) {
-        TypePtr that = (TypePtr) t;
-        return PTRS[xmeet0(that)];
-    }
-
-    @Override TypePtr xdual() { return new TypePtr((byte)(3-_nil)); }
-
-    // High scalar loses, low scalar wins
-    @Override TypeNil nmeet(TypeNil tn) {
-        if( _nil==0 ) return tn; // High scalar loses
-        if( _nil==1 ) return tn.makeFrom(xmeet0(tn)); // High scalar loses
-        if( _nil==2 ) return tn._nil==3 ? PTR : NPTR; // Low scalar wins
-        return PTR; // this
-    }
-
-
-    // RHS is  NIL
-    @Override Type meet0() { return isHigh() ? NIL : PTR; }
-    // RHS is XNIL
-    // 0->xscalar, 1->nscalar, 2->nscalar, 3->scalar
-    @Override Type meetX() { return _nil==0 ? XNIL : (_nil==3 ? PTR : NPTR); }
-
-    @Override TypePtr _makeStorage() { return PTR; }
-
-
-    @Override public String str() { return STRS[_nil]; }
-    @Override public SB _print(SB sb, BitSet visit, boolean html) { return sb.p(str()); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeRPC.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeRPC.java
deleted file mode 100644
index 7acc99de..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeRPC.java
+++ /dev/null
@@ -1,86 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.Ary;
-import java.util.*;
-
-/**
- *  Return Program Control or Return PC or RPC
- */
-public class TypeRPC extends Type {
-
-    // A set of CallEndNode IDs (or StopNode); commonly just one.  High-bit
-    // XInt sets represent complements/infinite sets.
-    public int[] _rpcs;
-
-    private static final Ary<TypeRPC> FREE = new Ary<>(TypeRPC.class);
-    private TypeRPC init(int[] rpcs) { _rpcs = XInt.intern(rpcs); return this; }
-    private TypeRPC() { super(TRPC); }
-    private static TypeRPC malloc(int[] rpcs) {
-        return (FREE.isEmpty() ? new TypeRPC() : FREE.pop()).init(rpcs);
-    }
-    private static TypeRPC make(int[] rpcs) {
-        TypeRPC rpc = malloc(rpcs);
-        TypeRPC t2 = rpc.intern();
-        return t2==rpc ? rpc : t2.free(rpc);
-    }
-    @Override TypeRPC free(Type t) {
-        TypeRPC rpc = (TypeRPC)t;
-        rpc._rpcs = null;
-        rpc._dual = null;
-        rpc._hash = 0;
-        FREE.push(rpc);
-        return this;
-    }
-    @Override boolean isFree() { return _rpcs==null; }
-
-    public static TypeRPC constant(int cend) {
-        return make(XInt.make(cend));
-    }
-
-    public int rpc() {
-        return XInt.onlyBit(_rpcs);
-    }
-
-
-    public  static final TypeRPC BOT = make(XInt.FULL);
-    private static final TypeRPC TEST2 = constant(2);
-    private static final TypeRPC TEST3 = constant(2);
-    public  static final TypeRPC EMPTY = make(XInt.EMPTY);
-
-    public static void gather(ArrayList<Type> ts) { ts.add(BOT); ts.add(TEST2); ts.add(TEST3); }
-
-    @Override public TypeRPC makeZero() { return EMPTY; }
-
-
-    @Override public String str() {
-        if( _rpcs == XInt.FULL  ) return "$[ALL]";
-        if( _rpcs == XInt.EMPTY ) return "$[]";
-        return "$"+XInt.str(_rpcs);
-    }
-
-    @Override
-    public TypeRPC xmeet(Type other) {
-        TypeRPC rpc = (TypeRPC)other;
-        return make(XInt.meet(_rpcs,rpc._rpcs));
-    }
-
-    @Override TypeRPC xdual() { return malloc(XInt.dual(_rpcs)); }
-    @Override Type rdual() {
-        TypeRPC d = xdual();
-        (_dual = d)._dual = this;
-        return d;
-    }
-
-    @Override boolean _isConstant() { return XInt.isConstant(_rpcs); }
-    @Override TypeRPC _makeStorage() { return this; }
-
-
-    @Override
-    int hash() { return XInt.hash(_rpcs); }
-    @Override
-    public boolean eq( Type t ) {
-        TypeRPC rpc = (TypeRPC)t; // Contract
-        return _rpcs==rpc._rpcs;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeScalar.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeScalar.java
deleted file mode 100644
index e369e6a5..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeScalar.java
+++ /dev/null
@@ -1,45 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.SB;
-
-import java.util.ArrayList;
-import java.util.BitSet;
-import java.util.HashMap;
-
-/**
- * The envelope for values which can live in an ordinary register or memory
- * field: integers, floats, memory pointers, and function pointers.
- *
- * `BOT` means any scalar value and `TOP` means no scalar value.  They sit
- * strictly inside the global {@link Type#BOTTOM}/{@link Type#TOP} pair, which
- * also includes non-values such as control and memory.
- */
-public class TypeScalar extends Type {
-    protected TypeScalar(byte type) { super(type); }
-    private TypeScalar() { this(TSCALAR); }
-
-    public static final TypeScalar BOT = new TypeScalar().intern();
-    public static final TypeScalar TOP = BOT.dual();
-
-    public static void gather(ArrayList<Type> ts) { ts.add(BOT); }
-
-    /** Meet two different scalar families. */
-    final Type smeet(TypeScalar scalar) {
-        if( _type == TSCALAR ) return isHigh() ? scalar : this;
-        if( scalar._type == TSCALAR ) return scalar.isHigh() ? this : scalar;
-        return BOT;
-    }
-
-    @Override Type xmeet(Type t) {
-        TypeScalar scalar = (TypeScalar)t;
-        return isHigh() ? scalar : this;
-    }
-
-    @Override TypeScalar xdual() { return new TypeScalar(); }
-    @Override public boolean isHigh() { return this == TOP; }
-    @Override Type _makeStorage() { return BOT; }
-
-
-    @Override public String str() { return isHigh() ? "~scalar" : "scalar"; }
-    @Override SB _print(SB sb, BitSet visit, boolean html) { return sb.p(str()); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeStruct.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeStruct.java
deleted file mode 100644
index 67169009..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeStruct.java
+++ /dev/null
@@ -1,640 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import com.seaofnodes.simple.util.*;
-import java.util.*;
-
-/**
- * Represents a struct type.
- */
-public class TypeStruct extends Type {
-
-    // A Struct has a name and a set of fields; the fields themselves have
-    // names, types and aliases.  The name is essentially another field,
-    // immutable and type ignored (BOT).
-
-    /**
-     * `_open` and `_fref` are independent lattice coordinates.
-     *
-     * `_open` says the structural tail is not known yet.  On the low side an
-     * open struct has infinitely many implicit BOT fields; its dual has an
-     * implicit TOP tail.  A real declaration is therefore open while its body
-     * is being parsed:
-     *
-     * ```text
-     * struct S { int x; /* more declared fields may follow *\/ }
-     * ```
-     *
-     * `_fref` says no actual declaration has contributed to the type.  The
-     * parser may still invent fields demanded by uses, leaving a useful open
-     * structural constraint:
-     *
-     * ```text
-     * S? p; p.x;       // fref S { BOT x; ... }
-     * ```
-     *
-     * Meeting that constraint with a real definition ANDs `_fref` off while
-     * retaining and checking the invented field.  Closing recursive types must
-     * not by itself clear `_fref`; closure discovers shape, not a declaration.
-     */
-
-    public String _name;  // Struct name
-    public boolean _open;
-    public boolean _fref;
-    public Field[] _fields;
-
-    private TypeStruct() { super(TSTRUCT); }
-    private static final Ary<TypeStruct> FREE = new Ary<>(TypeStruct.class);
-    private TypeStruct init(String name, boolean open, boolean fref, Field[] fields) {
-        // Check for const array element name with mutable field
-        //assert !name.startsWith("[~]") || fields.length!=2 || fields[1]._t==null || (fields[1]._final != fields[1]._t.isHigh());
-        _name = name;
-        _open = open;
-        _fref = fref;
-        _fields = fields;
-        return this;
-    }
-    // Return a filled-in TypeStruct; either from free list or alloc new.
-    private static TypeStruct malloc(String name, boolean open, boolean fref, Field[] fields) {
-        return (FREE.isEmpty() ? new TypeStruct() : FREE.pop()).init(name,open,fref,fields);
-    }
-    // Free ts; return this.
-    @Override TypeStruct free(Type t) {
-        TypeStruct ts = (TypeStruct)t;
-        assert !ts.isFree() && !ts._terned;
-        ts._name = null;
-        ts._fields = null;
-        ts._offs = null;
-        ts._dual = null;
-        ts._hash = 0;
-        ts._aliases = null;
-        ts._fidxs   = null;
-        FREE.push(ts);
-        return this;
-    }
-    @Override boolean isFree() { return _fields==null; }
-
-
-    // All fields directly listed
-    public static TypeStruct make(String name, boolean open, Field... fields) {
-        return make(name,open,false,fields);
-    }
-    public static TypeStruct make(String name, boolean open, boolean fref, Field... fields) {
-        TypeStruct ts = malloc(name, open, fref, fields);
-        TypeStruct t2 = ts.intern();
-        if( t2==ts ) return ts;
-        return VISIT.isEmpty() ? t2.free(ts) : ts.delayFree(ts);
-    }
-
-    // Summary aliases, after interning.  Skips private
-    // fields which need to be explicitly loaded.
-    private int[] _aliases;
-    public int[] aliases() {
-        if( _aliases != null ) return _aliases;
-        if( _fields.length==0 ) return (_aliases=XInt.EMPTY);
-        assert _terned;
-        int maxAlias = 0;
-        for( Field f : _fields )
-            maxAlias = Math.max(maxAlias,f._alias);
-        int len = XInt.idx(maxAlias)+1;
-        if( (maxAlias&31)==31 ) len++;
-        int[] xs = XInt.free(len);
-        for( Field f : _fields )
-            if( f._fname.charAt(0) != '_' &&  // Skip private fields.
-                !hiddenInit(f) &&             // Skip private allocation helper.
-                f._t != Type.TOP )            // Skip uninit fields
-                xs[XInt.idx(f._alias)] |= XInt.mask(f._alias);
-        return (_aliases=XInt.intern(xs));
-    }
-
-    // Summary fidxs, after interning.  Skips private
-    // fields which need to be explicitly loaded.
-    private int[] _fidxs;
-    public int[] fidxs() {
-        if( _fidxs != null ) return _fidxs;
-        assert _terned;
-        int[] xs = XInt.EMPTY;
-        for( Field f : _fields )
-            if( f._fname.charAt(0) != '_' &&     // Skip private fields.
-                !hiddenInit(f) &&                // Skip private allocation helper.
-                f._t instanceof TypeFunPtr tfp ) // Looking for TFP
-                xs = XInt.meet(xs,tfp._fidxs);
-        return (_fidxs = xs);
-    }
-
-    // With a user constructor, the same-named function field is the hidden
-    // default <init> allocation helper, not part of the public class surface.
-    public boolean hiddenInit(Field fld) {
-        if( field("<ctor>") == null || !_name.startsWith("class:") ) return false;
-        int idx = _name.lastIndexOf('.');
-        String name = _name.substring(idx<0 ? "class:".length() : idx+1);
-        return fld._fname.equals(name);
-    }
-
-    // New open struct with no fields
-    public static TypeStruct open( String name ) { return make(name,true); }
-    public static TypeStruct forward( String name ) { return make(name,true,true); }
-    public TypeStruct defined() { return _fref ? make(_name,_open,false,_fields) : this; }
-
-    // Array, variant body
-    public static TypeStruct makeAry(String name, TypeInteger len, int lenAlias, Type body, int bodyAlias, boolean efinal) {
-        return make(name,false,
-                    Field.make("#" , len, lenAlias, true ),
-                    Field.make("[]",body,bodyAlias,efinal));
-    }
-    // Array, known constant body
-    public static TypeStruct makeAry(String name, int lenAlias, int bodyAlias, TypeConAry con) {
-        Type len = TypeInteger.constant(con.len());
-        return make(name,false,
-                    Field.make("#"    ,len       , lenAlias,true),
-                    Field.make("[]"   ,con.elem(),bodyAlias,true),
-                    Field.make("[con]",con       ,bodyAlias,true));
-    }
-
-    public TypeStruct makeInit() {
-        Field[] fs = new Field[_fields.length];
-        for( int i=0; i<_fields.length; i++ ) {
-            if( _fields[i]._extern ) { fs[i] = _fields[i]; continue; }
-            Type zero = _fields[i]._t.makeZero();
-            fs[i] = _fields[i].makeFrom(_fields[i]._t != Type.BOTTOM && zero.isa(_fields[i]._t) ? zero : Type.TOP);
-        }
-        return make(_name,_open,_fref,fs);
-    }
-
-    public TypeStruct add( Field f ) {
-        assert find(f._fname)==-1; // No double field names
-        Field[] flds = Arrays.copyOf(_fields,_fields.length+1);
-        flds[_fields.length] = f;
-        return make(_name,_open,_fref,flds);
-    }
-    public TypeStruct replace( Field f ) {
-        Field[] flds = Arrays.copyOf(_fields,_fields.length);
-        flds[find(f._fname)] = f;
-        return make(_name,_open,_fref,flds);
-    }
-    public TypeStruct remove( int i ) {
-        Field[] flds = new Field[_fields.length-1];
-        System.arraycopy(_fields,  0,flds,0,i);
-        System.arraycopy(_fields,i+1,flds,i,flds.length-i);
-        return make(_name,_open,_fref,flds);
-    }
-
-    public TypeStruct addOrUpdate(Field fld) {
-        int idx = find(fld._fname);
-        int len = idx == -1 ? (idx=_fields.length)+1 : _fields.length;
-        Field[] flds = Arrays.copyOf(_fields,len);
-        flds[idx] = fld;
-        return make(_name,_open,_fref,flds);
-    }
-
-    public final TypeStruct close() {
-        return (TypeStruct)recurOpen()._close(_name, null).recurClose();
-    }
-    @Override TypeStruct _close( String name, HashMap<String, Type> TYPES ) {
-        assert (name==null) != (TYPES==null); // One or the other
-        String namePlusFinal = isAry() ? (_name+(_fields[1]._final ? "~" : "!")).intern() : _name;
-        TypeStruct ts = (TypeStruct)VISIT.get(namePlusFinal);
-        if( ts!=null ) return ts;
-        TypeStruct base = name==null ? (TypeStruct)TYPES.get(_name) : this;
-        assert base != null;
-        boolean open = base._fref ? base._open : name != _name && name != null && _open;
-        ts = base.recurPre(namePlusFinal, _name, open, base._fref );
-        Field[] flds = ts._fields;
-        // Now start the recursion
-        for( int i=0; i<flds.length; i++ )
-            flds[i].setType(base._fields[i]._t._close(name, TYPES));
-
-        // Note: this whole complex shenanigans here is because there are
-        // actually two flavors of any array (non-/final contents) but I
-        // allow the parser to represent both with the same name string.
-        if( isAry() && _fields[1]._final && !flds[1]._final ) // This is a final array variant
-            flds[1] = flds[1].makeFrom(true); // Add final to the base TYPES non-final array
-
-        return ts;
-    }
-
-    // Needs full recursive treatment; e.g.
-    //     struct LL { LL? next; int !q; }  // Q is mutable field.
-    // Stored into a not-mutable, so need that version also:
-    //     struct LL { LL? next; int  q; }  // Q is NOT mutable field.
-    // Now upgrade:
-    //     it is not the default version from TYPES.
-    //     it is fully cyclic
-    //
-    // Evil question: has no *open* internal fields, so can I assume it is fully correct and never needs upgrade?
-    //
-    // upgrades are for well-formed types with internal ptrs to early open
-    // versions of other types, as happens in all the CoRecur tests.
-    // During the co-recur tests, can I make non-default cycles with
-    // weaker versions of other early types?
-    // Seems plausible...
-    @Override Type _upgradeType(HashMap<String,Type> TYPES) {
-        TypeStruct base = (TypeStruct)TYPES.get(_name);
-        if( this == base ) return this; // Already the good form
-        TypeStruct ts = (TypeStruct)VISIT.get(_uid);
-        if( ts!=null ) return ts;
-        // Main work: replace open with closed
-        if( _open )
-            return base;
-        // Build recursive version
-        ts = recurPre(_uid,_name,false,_fref);
-        Field[] flds = ts._fields;
-        // Now start the recursion
-        for( int i=0; i<flds.length; i++ )
-            flds[i].setType(_fields[i]._t._upgradeType(TYPES));
-        return ts;
-    }
-
-    static final AryInt CEQUALS = new AryInt();
-
-    public  static final String TOPNAME = "$TOP", BOTNAME = "$BOT";
-    public  static final TypeStruct TOP = make("$TOP",false);
-    public  static final TypeStruct BOT = TOP.dual();
-    public  static final TypeStruct TEST= make("test",false,Field.TEST);
-    private static final TypeStruct ARY = makeAry("[]i64",TypeInteger.U32,-1,TypeInteger.BOT,-2,false);
-    private static final TypeStruct STR = makeAry("[]u8" ,TypeInteger.U32,-1,TypeInteger.U8 ,-4,false);
-    private static final TypeStruct ABC = makeAry("[]u8",-1,-4,TypeConAryB.ABC);
-    // Representative unresolved forms for the exhaustive lattice tests:
-    // bare forward ref, forward ref constrained by a field use, and definition.
-    private static final TypeStruct FREF0 = forward("%FREF");
-    private static final TypeStruct FREF1 = FREF0.add(Field.make("x",Type.BOTTOM,-20,false));
-    private static final TypeStruct FDEF1 = make("%FREF",false,Field.make("x",TypeInteger.BOT,-20,false));
-
-    // A pair of self-cyclic types
-    private static final TypeStruct SINT0  = make("%SINT",false);
-    private static final TypeStruct SFLT0  = make("%SFLT",false);
-    public  static final TypeStruct SINT1  = SINT0.add(Field.make("a", TypeInteger.U32, -1, false)).add(Field.make("s2",TypeMemPtr.make((byte)2,SFLT0),-2, false));
-    public  static final TypeStruct SFLT1  = SFLT0.add(Field.make("b", TypeFloat  .F32, -3, false)).add(Field.make("s1",TypeMemPtr.make((byte)2,SINT1),-4, false));
-
-    @Override public boolean isHigh() { return _name==TOPNAME; }
-
-    public static void gather(ArrayList<Type> ts) {
-        ts.add(BOT);
-        ts.add(TEST);
-        ts.add(ARY);
-        ts.add(STR);
-        ts.add(ABC);
-        ts.add(FREF0);
-        ts.add(FREF1);
-        ts.add(FDEF1);
-        ts.add(SINT0);
-        ts.add(SFLT0);
-        ts.add(SINT1);
-        ts.add(SFLT1);
-        // Break cyclic init: built a struct
-        Field fcalloc = Field.make("calloc",TypeFunPtr.CALLOC,-2,true);
-        TypeStruct scalloc = make("calloc",false,fcalloc);
-        ts.add(scalloc);
-
-    }
-
-    // Find field index by name
-    public int find(String fname) {
-        for( int i=0; i<_fields.length; i++ )
-            if( _fields[i]._fname==fname )
-                return i;
-        return -1;
-    }
-    public Field field(String fname) {
-        int idx = find(fname);
-        return idx== -1 ? null : _fields[idx];
-    }
-
-    // Find field index by alias
-    public int findAlias( int alias ) {
-        for( int i=0; i<_fields.length; i++ )
-            if( _fields[i]._alias==alias )
-                return i;
-        return -1;
-    }
-
-    @Override
-    TypeStruct xmeet(Type t) {
-        TypeStruct that = (TypeStruct) t;
-        assert !isFree() && !that.isFree();
-        if( this==TOP ) return that;
-        if( that==TOP ) return this;
-        if( this==BOT ) return BOT;
-        if( that==BOT ) return BOT;
-
-        // if equal, no matters.
-        // if short is BOT, chop     ; recurPre on short.
-        // if short is TOP, copy long; recurPre on long.
-        TypeStruct min = _fields.length < that._fields.length ? this : that;
-        if( _fields.length != that._fields.length && (!min._open ^ min!=this) )
-            return that.xmeet(this);
-
-        assert (_name==that._name) == (_name.equals(that._name)); // Strings are interned
-        String name =
-            that._name==TOPNAME ?      _name :
-                 _name==TOPNAME ? that._name :
-            that._name==_name ? _name :
-            BOTNAME;
-        if( name==BOTNAME ) return BOT;
-
-        // Check all other fields are sanely similar; same struct type but
-        // different field contents (e.g. field "age" is either 'int' or '18').
-        int len = Math.min(_fields.length,that._fields.length);
-        for( int i=0; i<len; i++ ) {
-            Field f0 = _fields[i], f1 = that._fields[i];
-            if( !f0._fname.equals(f1._fname) || f0._alias != f1._alias || f0._extern != f1._extern )
-                return BOT;
-        }
-
-        // See if we get a mid-recursion hit; breaks cycles
-        Integer pid = pid(that);
-        TypeStruct ts = (TypeStruct)VISIT.get(pid);
-        if( ts!=null ) return ts;
-        // If not mid-recursion, we are now; flag recursion.
-        boolean notRecur = VISIT.isEmpty();
-        if( notRecur ) recurOpen();
-
-        // Setup and install the type, prior to recursing, so we can find our
-        // recursive self again.
-        ts = recurPre(pid,name,_open | that._open,_fref & that._fref);
-
-        // Recurse all common fields
-        Field[] flds = ts._fields;
-        for( int i=0; i<len; i++ ) {
-            Field f0 = _fields[i], f1 = that._fields[i];
-            flds[i].setType(f0._t.meet(f1._t ));
-            flds[i]._final = f0._final | f1._final;
-        }
-
-        // Handle extra fields via `_open`
-        for( int i=len; i<_fields.length; i++ )
-            flds[i].setType(_fields[i]._t );
-
-        // Cleanup post-recursion; intern/install at cycle end
-        if( notRecur ) ts = (TypeStruct)ts.recurClose();
-        return ts;
-    }
-
-    @Override
-    TypeStruct xdual() {
-        Field[] flds = new Field[_fields.length];
-        for( int i=0; i<_fields.length; i++ )
-            flds[i] = _fields[i].dual();
-        return malloc(sdual(),!_open,!_fref,flds);
-    }
-
-    // Recursive dual
-    @Override TypeStruct rdual() {
-        if( _dual!=null ) return dual();
-        assert !_terned;
-        Field[] flds = new Field[_fields.length];
-        TypeStruct d = malloc(sdual(),!_open,!_fref,flds);
-        (_dual = d)._dual = this; // Cross link duals
-        for( int i=0; i<_fields.length; i++ )
-            flds[i] = _fields[i]._terned ? _fields[i].dual() : _fields[i].rdual();
-        return d;
-    }
-
-    private String sdual() {
-        return
-            _name==TOPNAME ? BOTNAME :
-            _name==BOTNAME ? TOPNAME :
-            _name;
-    }
-
-    @Override boolean _isConstant() {
-        assert !_open; // who is asking about constant open structs? if( _open ) return false; // Infinite BOT fields
-        assert !VISIT.containsKey(_uid); //expect constants to not include self-cycles.  if( VISIT.containsKey(_uid) ) return true; // Cycles assume constant
-        VISIT.put(_uid,this);
-        // Check all fields for being constant
-        for( Field field : _fields )
-            if( !field._isConstant() )
-                return false;
-        return true;
-    }
-
-    // All fields are final
-    @Override boolean _isFinal() {
-        if( _open ) return false;     // May have more non-final fields
-        if( VISIT.containsKey(_uid) ) // Test: been here before?
-            return true;              // Cycles assume final
-        VISIT.put(_uid,this);         // Set: don't do this again
-        for( Field fld : _fields )
-            if( !fld._isFinal() )
-                return false;
-        return true;
-    }
-
-    private TypeStruct recurPre(Object key, String name, boolean open, boolean fref) {
-        // Make a clone of original; suitable for hashing so can build
-        // e.g. TMPs to clone as part of cycles - but will fail the 'eq' check
-        // until the entire cycle is built.
-        Field[] flds  = new Field[_fields.length];
-        for( int i=0; i<flds.length; i++ )
-            flds[i] = _fields[i].malloc(); // Blank copy, but can be hashed
-        TypeStruct ts = malloc(name, open, fref, flds );
-        ts._aliases = aliases();
-        VISIT.put(key,ts);
-        return ts;
-    }
-
-    private interface FieldTransform { Type apply(Type t); }
-
-    private TypeStruct recurTransform(Object key, String name, boolean open, boolean fref, boolean xfinal, FieldTransform transform) {
-        TypeStruct ts = (TypeStruct)VISIT.get(key);
-        if( ts!=null ) return ts;   // Already visited
-        ts = recurPre(key,name,open,fref);
-        Field[] flds = ts._fields;
-        for( Field fld : flds )
-            fld._final |= xfinal;
-
-        // Now start the recursion
-        for( int i=0; i<flds.length; i++ )
-            flds[i].setType(transform.apply(_fields[i]._t));
-
-        return ts;
-    }
-
-    // Make a read-only version
-    @Override TypeStruct _makeRO() {
-        return recurTransform(_name,_name,_open,_fref,true,Type::_makeRO);
-    }
-
-    @Override TypeStruct _makeStorage() {
-        return recurTransform(_uid,_name,_open,false,false,Type::_makeStorage);
-    }
-
-    // log_size for a struct is not defined, unless its exactly some power of
-    // 2.  *Total size* is well-defined, and is available in the offsets.
-    @Override public int log_size() { throw Utils.TODO("Should not reach here: structs have no scalar log size"); }
-    @Override public int size() { return offset(_fields.length); }
-    @Override public int alignment() {
-        int align = 0;
-        for( Field f : _fields )
-            if( !f._extern ) align = Math.max(align, f._t.alignment());
-        return align;
-    }
-
-    // If false, always false.
-    // If true , maybe true, need to check recursive fields.
-    private boolean static_eq( TypeStruct ts ) {
-        assert (_name==ts._name) == (_name.equals(ts._name)); // Strings are interned
-        return _name==ts._name && _open==ts._open && _fref==ts._fref && _fields.length==ts._fields.length;
-    }
-
-    @Override boolean eq(Type t) {
-        TypeStruct ts = (TypeStruct)t; // Invariant
-
-        // Recursive; so use cyclic equals
-        if( !VISIT.isEmpty() ) {
-            assert CEQUALS.isEmpty();
-            boolean rez = cycle_eq(t);
-            CEQUALS.clear();
-            return rez;
-        }
-        // Normal equals
-        if( !static_eq(ts) ) return false;
-        if( _fields==ts._fields ) return true;
-        for( int i = 0; i < _fields.length; i++ )
-            if( !_fields[i].eq(ts._fields[i]) )
-                return false;
-        return true;
-    }
-
-    @Override boolean cycle_eq(Type t) {
-        if( this==t ) return true;
-        TypeStruct ts = (TypeStruct)t; // Invariant
-        if( !static_eq(ts) ) return false;
-        if( _fields==ts._fields ) return true;
-        // Check to see if we've ever compared this pair of types before;
-        // if so, then assume the cycle is equal here.
-        int pid = pid(ts);
-        if( CEQUALS.find(pid)!= -1 ) return true;
-        CEQUALS.push(pid);
-        // Recursively check fields
-        for( int i = 0; i < _fields.length; i++ )
-            if( !_fields[i].cycle_eq(ts._fields[i]) )
-                return false;
-        return true;
-    }
-
-    @Override
-    int hash() {
-        long hash = _name.hashCode() ^ (_open ? 4 : 0) ^ (_fref ? 8 : 0);
-        for( Field f : _fields )
-            hash = Utils.rot(hash,13) ^ ((long)f._fname.hashCode() * f._alias);
-        return Utils.fold(hash);
-    }
-
-    @Override public int nkids() { return _fields.length; }
-    @Override public Field at( int idx ) { return _fields[idx]; }
-    @Override public void set( int idx, Type t ) { _fields[idx] = (Field)t; }
-    // Tags 0-4 - closed +#nflds (+name)
-    // Tags 5   - closed(+ nflds  +name)
-    // Tags 6-10- open   +#nflds (+name)
-    // Tags 11  - open  (+ nflds  +name)
-
-
-    @Override
-    SB _print(SB sb, BitSet visit, boolean html ) {
-        if( this==BOT ) return sb.p("StructBot");
-        if( this==TOP ) return sb.p("StructTop");
-        if( isFree() ) return sb.p("FREE:").p(_name);
-        if( isAry() && field("[]")._t instanceof TypeConAry con )
-            return sb.p(con.str());
-        sb.p(_name);
-        if( isAry() )
-            // Array names deliberately canonicalize mutable and immutable
-            // element variants.  The verbose debugger print must retain the
-            // otherwise invisible lattice coordinate.
-            return sb.p(_fields[1]._final ? "[final]" : "[mutable]");
-        if( html )
-            return sb;
-        sb.p(" {");
-        for( Field f : _fields )
-            (f._t ==null ? sb.p("---") : f._t.print(sb,visit,html)).p(f._final ? " " : " !").p(f._fname).p("; ");
-        if( _open && !_fref ) sb.p("... ");
-        return sb.p("}");
-    }
-
-    @Override public String str() {
-        if( this==BOT ) return "StructBot";
-        if( this==TOP ) return "StructTop";
-        return (isFree() ? "FREE:":"")+_name;
-    }
-
-
-    public boolean isAry() { return find("[]")!=-1; }
-    public boolean isConAry() {
-        return isAry() && _fields[1]._t instanceof TypeConAry;
-    }
-
-    public int aryBase() {
-        assert isAry();
-        if( _offs==null ) _offs = offsets();
-        return _offs[1];
-    }
-    public int aryScale() {
-        assert isAry();
-        return _fields[1]._t.log_size();
-    }
-
-
-    // Field offsets as packed byte offsets
-    private int[] _offs;  // Lazily computed and not part of the type semantics
-    public int offset(int idx) {
-        if( _offs==null ) _offs = offsets();
-        return _offs[idx];
-    }
-    private int[] offsets() {    // Field byte offsets
-        assert CodeGen.CODE._phase.ordinal() >= CodeGen.Phase.FinalizeIR.ordinal();
-        // Compute a layout for a collection of fields
-        assert _fields != null; // No forward refs
-
-        // Compute a layout
-        _offs = new int[_fields.length+1];
-        if( isAry() ) {         // Arrays used fixed u32 len, padding to elems, var length
-            assert _fields[1]._fname=="[]";
-            // Pad out to the element alignment
-            int align = _fields[1]._t.alignment();
-            _offs[1] = (4 + ((1<<align)-1)) & -(1<<align);
-            if( _fields[1]._t instanceof TypeConAry ary ) // Array length is well-defined for constants, not defined for runtime arrays
-                _offs[2] = _offs[1]+ary.len();
-
-        } else {
-            int[] cnts = new int[5]; // Count of fields at log field size
-            int flen = _fields.length;
-            for( int i=0; i<flen; i++ )
-                if( !_fields[i]._extern )
-                    cnts[_fields[i]._t.log_size()]++; // Log size is 0(byte), 1(i16/u16), 2(i32/f32), 3(i64/dbl)
-            int off = 0, idx = 0; // Base common struct fields go here, e.g. Mark/Klass
-            // Compute offsets to the start of each power-of-2 aligned fields.
-            int[] offs = new int[4];
-            for( int i=3; i>=0; i-- ) {
-                offs[i] = off;
-                off += cnts[i]<<i;
-            }
-            // Assign offsets to all fields.
-            // Really a hidden radix sort.
-            for( int i=0; i<flen; i++ ) {
-                if( _fields[i]._extern ) { _offs[idx++] = -1; continue; }
-                int log = _fields[i]._t.log_size();
-                _offs[idx++] = offs[log]; // Field offset
-                offs[log] += 1<<log;      // Next field offset at same alignment
-                cnts[log]--;              // Count down, should be all zero at end
-            }
-            _offs[flen] = off; // Max struct size, no trailing padding
-        }
-        return _offs;
-    }
-
-    // Field order with increasing offset
-    public int[] layout() {
-        offset(0);
-        int len = _offs.length;
-        int[] is = new int[len];
-        for( int i=0; i<len; i++ ) is[i] = i;
-        // Stoopid hand rolled bubble sort
-        for( int i=0; i<len; i++ )
-            for( int j=i+1; j<len; j++ )
-                if( _offs[is[j]] < _offs[is[i]] )
-                    { int tmp = is[i]; is[i] = is[j]; is[j] = tmp; }
-        return is;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeTuple.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeTuple.java
deleted file mode 100644
index 0d70bdf2..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/TypeTuple.java
+++ /dev/null
@@ -1,158 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.*;
-import java.util.*;
-
-public class TypeTuple extends Type {
-
-    public Type[] _types;
-
-    private static final Ary<TypeTuple> FREE = new Ary<>(TypeTuple.class);
-    private TypeTuple(Type[] types) { super(TTUPLE); _types = types; }
-    private TypeTuple init( Type[] types ) { _types = types; return this; }
-    private static TypeTuple malloc(Type[] types) {
-        return FREE.isEmpty() ? new TypeTuple(types) : FREE.pop().init(types);
-    }
-    // All fields directly listed
-    public static TypeTuple make(Type... types) {
-        TypeTuple tt = malloc(types);
-        TypeTuple t2 = tt.intern();
-        return t2==tt ? tt : t2.free(tt);
-    }
-    @Override TypeTuple free(Type t) {
-        TypeTuple tt = (TypeTuple)t;
-        tt._types = null;
-        tt._dual = null;
-        tt._hash = 0;
-        FREE.push(tt);
-        return this;
-    }
-    @Override boolean isFree() { return _types==null; }
-
-    public TypeTuple makeFrom(int idx, Type tx ) {
-        if( _types[idx]==tx ) return this;
-        Type[] types = _types.clone();
-        types[idx] = tx;
-        return make(types);
-    }
-    public TypeTuple meetFrom(int idx, Type t ) { return makeFrom(idx,_types[idx].meet(t)); }
-
-    public static final TypeTuple BOT = malloc(new Type[0]).intern();
-    public static final TypeTuple TOP = BOT.dual();
-    // The default state, a triple of CONTROL, Memory, and Value, with bottoms
-    // for all.  This is the default StopNode type, when new functions are
-    // being created and we cannot tell what the future holds.  This is the
-    // default ReturnNode type, returning what the worst a function can do.
-    public static final TypeTuple STATE = make(Type.CONTROL,TypeMem.BOT,Type.BOTTOM);
-    public static final TypeTuple STOP_HIGH = make(Type.CONTROL,TypeMem.START,Type.TOP);
-
-    public static final TypeTuple TEST = make(TypeInteger.BOT,TypeMemPtr.TEST);
-    public static final TypeTuple DEAD_NEW = make(TypeMemPtr.TOP,TypeMem.TOP);
-
-    public static final TypeTuple IF_BOTH    = make(Type. CONTROL,Type. CONTROL);
-    public static final TypeTuple IF_NEITHER = make(Type.XCONTROL,Type.XCONTROL);
-    public static final TypeTuple IF_TRUE    = make(Type. CONTROL,Type.XCONTROL);
-    public static final TypeTuple IF_FALSE   = make(Type.XCONTROL,Type. CONTROL);
-
-    public static void gather(ArrayList<Type> ts) { ts.add(BOT); ts.add(TEST); ts.add(STATE); ts.add(IF_TRUE); }
-
-    @Override
-    Type xmeet(Type other) {
-        TypeTuple that = (TypeTuple)other;     // contract from xmeet
-        if( this==TOP ) return that;
-        if( that==TOP ) return this;
-        if( _types.length != that._types.length )
-            return BOT;
-        return make(TypeFunPtr.xmeet(_types,that._types));
-    }
-
-    @Override TypeTuple xdual() {
-        if( _types.length==0 ) return malloc(null);
-        boolean isCon=true;
-        for( Type t : _types )
-            if( t._dual!=t )
-                // Not a constant
-                return malloc(TypeFunPtr.xdual(_types));
-        return this;
-    }
-    @Override TypeTuple rdual() {
-        if( _dual!=null ) return dual();
-        assert !_terned;
-        assert _types.length>0;
-        Type[] ts = new Type[_types.length];
-        TypeTuple d = malloc(ts);
-        (_dual = d)._dual = this; // Cross link duals
-        // Collection rdual
-        for( int i=0; i<_types.length; i++ )
-            ts[i] = _types[i]._terned ? _types[i].dual() : _types[i].rdual();
-        return d;
-    }
-
-    @Override boolean _isConstant() {
-        for( Type t : _types )
-            if( !t._isConstant() )
-                return false;
-        return true;
-    }
-    @Override boolean _isFinal() { throw Utils.TODO("Should not reach here: tuples are not stored object values"); }
-
-    @Override TypeMemPtr _makeRO() { throw Utils.TODO("Should not reach here: tuples cannot be made read-only"); }
-
-    @Override Type _upgradeType(HashMap<String,Type> TYPES) {
-        Type[] ts = new Type[_types.length];
-        for( int i=0; i<ts.length; i++ )
-            ts[i] = _types[i]._upgradeType(TYPES);
-        return make(ts);
-    }
-
-    @Override public int log_size() { throw Utils.TODO("Should not reach here: tuples have no scalar storage size"); }
-    @Override public int alignment() {
-        assert isConstant();
-        int align = 0;
-        for( Type t : _types )
-            align = Math.max(align,t.alignment());
-        return align;
-    }
-
-    public Type    ctl() { assert _types.length>=3; return _types[0]; }
-    public Type    ret() { assert _types.length>=3; return _types[2]; }
-    public TypeMem mem() { assert _types.length>=3;
-        return _types[1] instanceof TypeMem tmem ? tmem : (_types[1].isHigh() ? TypeMem.START : TypeMem.BOT);
-    }
-
-    @Override public int nkids() { return _types.length; }
-    @Override public Type at( int idx ) { return _types[idx]; }
-    @Override public void set( int idx, Type t ) { _types[idx] = t; }
-
-
-    @Override SB _print(SB sb, BitSet visit, boolean html ) {
-        if( this==TOP ) return sb.p("[TOP]");
-        if( this==BOT ) return sb.p("[BOT]");
-        sb.p("[  ");
-        for( Type t : _types )
-            t.print(sb,visit,html).p(", ");
-        return sb.unchar(2).p("]");
-    }
-
-    @Override public String str() { return print(new SB(),new BitSet(),false).toString(); }
-
-    @Override
-    int hash() {
-        int sum = 0;
-        if( _types!=null ) for( Type type : _types ) sum ^= type.hashCode();
-        return sum;
-    }
-
-    @Override
-    boolean eq( Type t ) {
-        TypeTuple that = (TypeTuple)t; // Contract
-        if( _types==null && that._types==null ) return true;
-        if( _types==null || that._types==null ) return false;
-        if( _types.length != that._types.length ) return false;
-        for( int i=0; i<_types.length; i++ )
-            if( _types[i]!=that._types[i] )
-                return false;
-        return true;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/type/XInt.java b/chapter-modules/src/main/java/com/seaofnodes/simple/type/XInt.java
deleted file mode 100644
index 126a4e64..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/type/XInt.java
+++ /dev/null
@@ -1,244 +0,0 @@
-package com.seaofnodes.simple.type;
-
-import com.seaofnodes.simple.util.*;
-import java.lang.Integer;
-import java.util.Arrays;
-
-// Stupidly overkill interned immutable int[]'s
-public abstract class XInt {
-    private static final Ary<Ary<int[]>> FREES = new Ary(Ary.class);
-    private static final Ary<Ary<int[]>> INTERNS = new Ary(Ary.class);
-    private static int PROBES, HITS, NEWS;
-
-    public static final int[] EMPTY = intern(new int[]{0, 0});
-    public static final int[] FULL  = intern(new int[]{0,-1});
-    public static final int[] SET1  = make(1);
-    public static final int[] SET3  = make(SET1, 2);
-
-    static int idx(int x) { return (x>>5)+1; }
-    static int mask(int x) { return 1<<(x&31); }
-
-    // No hash set, still mutable
-    public static boolean isMutable(int[] xs) { return xs[0]==0; }
-    // Return hash code; must be set hence frozen
-    public static int hash(int[] xs) { return xs[0]; }
-
-    // High bit set (infinite 1's extension)
-    public static boolean isHigh(int[] xs) { return xs[xs.length-1] < 0; }
-
-    // Check for a bit
-    public static boolean bit(int[] xs, int x) {
-        int idx = idx(x);
-        if( idx >= xs.length )
-            return isHigh(xs);
-        return (xs[idx] & mask(x))!=0;
-    }
-
-    // Number of bits set
-    public static int bitCount(int[] xs) {
-        assert !isHigh(xs);       // Dont ask if infinite
-        int cnt=0;
-        for( int i=1; i<xs.length; i++ )
-            cnt += Integer.bitCount(xs[i]);
-        return cnt;
-    }
-
-    // Largest bit
-    public static int max(int[] xs) {
-        assert !isHigh(xs);
-        return Integer.numberOfTrailingZeros(xs[xs.length-1])+((xs.length-1-1)<<5);
-    }
-
-    // Has 1 bit set
-    public static boolean isConstant(int[] xs) { return !isHigh(xs) && bitCount(xs)==1; }
-    // Return the 1 set bit or assert
-    public static int onlyBit(int[] xs) {
-        assert isConstant(xs);
-        for( int i=1; i<xs.length; i++ )
-            if( xs[i] != 0 )
-                return Integer.numberOfTrailingZeros(xs[i]) + ((i-1)<<5);
-        throw Utils.TODO("Should not reach here");
-    }
-
-    // Subset check: ys is a subset of xs
-    public static boolean subset(int[] xs, int[] ys) {
-        assert !isMutable(ys);
-        if( xs==ys ) return true;
-        if( xs==FULL ) return true;
-        if( ys==EMPTY ) return true;
-        int min = Math.min(xs.length,ys.length);
-        for( int i=1; i<min; i++ )
-            if( (xs[i] | ys[i])!=xs[i] )
-                return false;
-        if( xs.length == ys.length )
-            return true;
-        if( ys.length < xs.length )
-            return !isHigh(ys); // If ys is infinite, it'll hit one of the xs extra zeros
-        return isHigh(xs);
-    }
-
-
-    // Construct a set with 1 bit set
-    public static int[] make(int x ) { return make(EMPTY,x); }
-
-    // Add a bit
-    public static int[] make(int[] xs, int x ) {
-        assert !isMutable(xs);
-        int idx = idx(x);
-        if( idx >= xs.length && isHigh(xs) )
-            return xs;          // Set in the default infinite
-        if( idx < xs.length && (mask(x) & xs[idx])!=0 )
-            return xs;          // Already set
-        int len = Math.max(xs.length,idx+1);
-        if( (x&31)==31 && idx+1==len )
-            len++;
-        int[] ys = free(len);
-        System.arraycopy(xs,1,ys,1,xs.length-1);
-        ys[idx] |= mask(x);
-        return intern(ys);
-    }
-
-    // Interning, and life-cycle management
-    // Intern the array
-    public static int[] intern(int[] xs) {
-        if( !isMutable(xs) ) return xs; // Already interned
-        PROBES++;
-
-        // Trim trailing 0s or -1s, use the infinite extend bit
-        int len = xs.length;
-        while( len > 2 &&
-               ((xs[len-1]==  0 && xs[len-2]>=0) ||
-                (xs[len-1]== -1 && xs[len-2]< 0) ) )
-            len--;
-        // Replace with trimmed
-        if( len < xs.length ) {
-            var ys = free(len);
-            System.arraycopy(xs,1,ys,1,len-1);
-            xs = _free(xs,ys);
-        }
-
-        // Compute lame hash code
-        int hash = 0;
-        for( int i=1; i<len; i++ )
-            hash += xs[i];
-        if( hash == 0 ) hash = 0xCAFEBABE;
-        xs[0] = hash;           // Set lame hashcode, and mark immutable
-
-        // Get length-specific INTERN table
-        var xss = INTERNS.atX(len);
-        if( xss==null )
-            INTERNS.setX( xs.length, xss = new Ary<>(int[].class));
-
-        // Probe for a hit
-        for( int[] ys : xss )
-            if( Arrays.equals(xs,ys) ) // Hit!
-                // Free new array and return old array
-                { HITS++;  return _free(xs,ys);  }
-
-        // Intern new array and return
-        return xss.push(xs);
-    }
-
-    // Return Ary of free int[]s of fixed size
-    private static Ary<int[]> _xss(int len) {
-        Ary<int[]> xss = FREES.atX(len);
-        if( xss==null )
-            FREES.setX(len, xss = new Ary<>(int[].class));
-        return xss;
-    }
-    // Pull free array from free list
-    static int[] free(int len) {
-        int[] xs = _xss(len).pop();
-        if( xs==null )
-            { NEWS++;  xs = new int[len];  }
-        assert isMutable(xs);
-        return xs;
-    }
-    // Return ys.  Put xs on free list
-    static int[] _free(int[] xs, int[] ys) {
-        Arrays.fill(xs,0);      // Mutable again
-        _xss(xs.length).push(xs);
-        return ys;
-    }
-
-    // Meet: Set union
-    public static int[] meet(int[] xs, int[] ys) {
-        if( xs==ys ) return xs;
-        boolean isX=true, isY=true;
-        int min = Math.min(xs.length,ys.length);
-        int max = Math.max(xs.length,ys.length);
-        for( int i=1; i<max; i++ ) {
-            int x = i < xs.length ? xs[i] : isHigh(xs) ? -1 : 0;
-            int y = i < ys.length ? ys[i] : isHigh(ys) ? -1 : 0;
-            if( (x | y)!=x ) isX=false;
-            if( (x | y)!=y ) isY=false;
-        }
-        if( isX ) return xs;
-        if( isY ) return ys;
-        // Get a free one
-        int[] ms = free(max);
-        for( int i=1; i<min; i++ )
-            ms[i] = xs[i] | ys[i];
-        for( int i=min; i<ms.length; i++ ) {
-            int x = i < xs.length ? xs[i] : isHigh(xs) ? -1 : 0;
-            int y = i < ys.length ? ys[i] : isHigh(ys) ? -1 : 0;
-            ms[i] = x | y;
-        }
-        return intern(ms);
-    }
-
-    // Dual: flip all the bits
-    public static int[] dual(int[] xs) {
-        int[] ds = free(xs.length);
-        for( int i=1; i<xs.length; i++ )
-            ds[i] = ~xs[i];
-        return intern(ds);
-    }
-
-
-    // Next set bit, or -1
-    // for( int bit = XInt.next(bits,0); bit >=0; bit = XInt.next(bits,bit) ) {...bit...}
-    public static int next(int[] xs, int x) {
-        assert !isHigh(xs);     // No iterating infinite bitsets
-        x++;                    // Skip current
-        for( ; !bit(xs,x); x++ )
-            if( idx(x)>=xs.length )
-                return -1;
-        return x;
-    }
-
-    // Remap all bits
-
-
-    public static String str(int[] xs) { return str(new SB(),xs).toString(); }
-    public static SB str(SB sb, int[] xs) {
-        sb.p("[ ");
-        // Printing ranges;
-        //   1,2,3 prints 1-3
-        //   1,2,4 prints 1,2,4
-        //
-        int max = (xs.length-1)<<5;
-        int low = 0;   // No low range
-        for( int i=1; i<max; i++ ) {
-            if( bit(xs,i) ) {       // Set bit, start or extend range
-                if( low==0 ) low=i; // No range, start one
-            } else {                // Break in sequence, ending a range
-                range(sb,low,i-1);  // Print prior range, and start new one
-                low=0;              // Reset range
-            }
-        }
-        // Print any partial range
-        range(sb,low,max-1).unchar();
-        if( isHigh(xs) )
-            sb.p(",...");
-        return sb.p("]");
-    }
-
-    private static SB range( SB sb, int low, int mid ) {
-        if( low==0 ) ;
-        else if( low==mid ) sb.p(low).p(',');
-        else if( low==mid-1 ) sb.p(low).p(',').p(mid).p(',');
-        else sb.p(low).p('-').p(mid).p(',');
-        return sb;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/util/Ary.java b/chapter-modules/src/main/java/com/seaofnodes/simple/util/Ary.java
deleted file mode 100644
index d67801c2..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/util/Ary.java
+++ /dev/null
@@ -1,229 +0,0 @@
-package com.seaofnodes.simple.util;
-
-import java.lang.StringBuilder;
-import java.lang.reflect.Array;
-import java.util.*;
-
-// ArrayList with saner syntax
-public class Ary<E> extends AbstractList<E> implements List<E> {
-    public E[] _es;
-    public int _len;
-
-    public Ary(E[] es) { this(es,es.length); }
-    public Ary(E[] es, int len) { if( es.length==0 ) es=Arrays.copyOf(es,1); _es=es; _len=len; }
-    @SuppressWarnings("unchecked")
-    public Ary(Class<E> clazz) { this((E[]) Array.newInstance(clazz, 1),0); }
-
-    /** @return list is empty */
-    public boolean isEmpty() { return _len==0; }
-    /** @return active list length */
-    public int len() { return _len; }
-    public int size() { return len(); }
-
-    /** @param i element index
-     *  @return element being returned; throws if OOB
-     *  @exception AIOOBE if !(0 <= i < _len)
-     */
-    public E get( int i ) { return at(i); }
-    public E at( int i ) {
-        range_check(i);
-        return _es[i];
-    }
-    public E atX( int i ) {
-        if( i >= _len ) return null;
-        return _es[i];
-    }
-
-    /** @return last element */
-    public E last( ) { return at(_len-1); }
-    public E last(int x ) { return at(_len-1+x); }
-
-    /** Add element in amortized constant time
-     *  @param e Element to add at end of list
-     **/
-    public E push( E e ) {
-        if( _len >= _es.length ) _es = Arrays.copyOf(_es,Math.max(1,_es.length<<1));
-        return (_es[_len++] = e);
-    }
-    /** @return remove and return last element */
-    public E pop( ) {
-        return _len==0 ? null : _es[--_len];
-    }
-    @Override public E removeLast() { return pop(); }
-
-
-    /** Add element in amortized constant time
-     *  @param e Element to add at end of list
-     *  @return true */
-    public boolean add( E e ) {
-        if( _len >= _es.length ) _es = Arrays.copyOf(_es,Math.max(1,_es.length<<1));
-        _es[_len++] = e;
-        return true;
-    }
-
-    /** Fast, constant-time, element removal.  Does not preserve order
-     *  @param i element to be removed
-     *  @return element removed */
-    public E del( int i ) {
-        range_check(i);
-        E tmp = _es[i];
-        _es[i]=_es[--_len];
-        return tmp;
-    }
-
-    /** Slow, linear-time, element removal.  Preserves order.
-     *  @param i element to be removed
-     *  @return element removed */
-    @Override public E remove( int i ) {
-        range_check(i);
-        E e = _es[i];
-        System.arraycopy(_es,i+1,_es,i,(--_len)-i);
-        return e;
-    }
-
-    /** Slow, linear-time, element insertion.  Preserves order.
-     *  @param i where to insert
-     *  @return element inserted */
-    public E insert( E e, int i ) {
-        setLen(_len+1);
-        System.arraycopy(_es,i,_es,i+1,_len-i);
-        _es[i] = e;
-        return e;
-    }
-
-
-    /** Remove all elements */
-    public void clear( ) { _len=0; }
-
-    /** Set existing element
-     *  @param i element to set
-     *  @param e value to set
-     *  @return old value
-     *  @exception AIOOBE if !(0 <= i < _len)
-     */
-    public E set( int i, E e ) {
-        range_check(i);
-        E old = _es[i];
-        _es[i] = e;
-        return old;
-    }
-
-    /** Set existing element
-     *  @param i element to set
-     *  @param e value to set
-     *  @return old value
-     *  @exception AIOOBE if !(0 <= i < _len)
-     */
-    public E setX( int i, E e ) {
-        if( i >= _len ) {
-            while( i >= _es.length ) _es = Arrays.copyOf( _es, _es.length << 1 );
-            _len = i+1;
-        }
-        E old = _es[i];
-        _es[i] = e;
-        return old;
-    }
-
-    public Ary<E> setLen( int len ) {
-        if( len > _len )
-            while( len>= _es.length ) _es = Arrays.copyOf(_es,_es.length<<1);
-        _len = len;
-        while( _es.length > (len<<1) ) // Shrink if hugely too large
-            _es = Arrays.copyOf(_es,_es.length>>1);
-        Arrays.fill(_es,len,_es.length,null);
-        return this;
-    }
-
-    public E swap( int i, int j ) {
-        range_check(i);
-        range_check(j);
-        E tmp = _es[i];
-        if( i==j ) return tmp;
-        _es[i] = _es[j];
-        _es[j] = tmp;
-        return tmp;
-    }
-
-
-    /** @param c Collection to be added */
-    public boolean addAll( Collection<? extends E> c ) {
-        if( c==null ) return false;
-        for( E e : c ) add(e);
-        return true;
-    }
-    public Ary<E> addAll( Iterable<? extends E> it ) { for( E e : it ) add(e); return this; }
-
-    /** @param es Array to be added */
-    public <F extends E> Ary<E> addAll( F[] es ) {
-        if( es==null || es.length==0 ) return this;
-        while( _len+es.length > _es.length ) _es = Arrays.copyOf(_es,_es.length<<1);
-        System.arraycopy(es,0,_es,_len,es.length);
-        _len += es.length;
-        return this;
-    }
-
-    /** @param c Collection to be added */
-    public Ary<E> addAll( Ary<? extends E> c ) {
-        if( c==null || c._len==0 ) return this;
-        while( _len+c._len > _es.length ) _es = Arrays.copyOf(_es,_es.length<<1);
-        System.arraycopy(c._es,0,_es,_len,c._len);
-        _len += c._len;
-        return this;
-    }
-
-    /** @return compact array version */
-    public E[] asAry() { return Arrays.copyOf(_es,_len); }
-
-    /** Find the first matching element using ==, or -1 if none.  Note that
-     *  most del calls shuffle the list, so the first element might be random.
-     *  @param e Element to find
-     *  @return index of first matching element, or -1 if none */
-    public int find( E e ) {
-        for( int i=0; i<_len; i++ )  if( _es[i]==e )  return i;
-        return -1;
-    }
-
-
-    /** @return an iterator */
-    @Override public Iterator<E> iterator() { return new Iter(); }
-    private class Iter implements Iterator<E> {
-        int _i=0;
-        @Override public boolean hasNext() { return _i<_len; }
-        @Override public E next() { return _es[_i++]; }
-    }
-
-    @Override public String toString() {
-        StringBuilder sb = new StringBuilder().append('{');
-        for( int i=0; i<_len; i++ ) {
-            if( i>0 ) sb.append(',');
-            if( _es[i] != null ) sb.append(_es[i].toString());
-        }
-        return sb.append('}').toString();
-    }
-
-    private void range_check( int i ) {
-        if( i < 0 || i>=_len )
-            throw new ArrayIndexOutOfBoundsException(""+i+" >= "+_len);
-    }
-
-    // Note that the hashCode() and equals() are not invariant to changes in the
-    // underlying array.  If the hashCode() is used (e.g., inserting into a
-    // HashMap) and the then the array changes, the hashCode() will change also.
-    @Override public boolean equals( Object o ) {
-        if( this==o ) return true;
-        if( !(o instanceof Ary ary) ) return false;
-        if( _len != ary._len ) return false;
-        if( _es == ary._es ) return true;
-        for( int i=0; i<_len; i++ )
-            if( !(_es[i]==null ? (ary._es[i] == null) : _es[i].equals(ary._es[i])) )
-                return false;
-        return true;
-    }
-    @Override public int hashCode( ) {
-        int sum=_len;
-        for( int i=0; i<_len; i++ )
-            sum += _es[i]==null ? 0 : _es[i].hashCode();
-        return sum;
-    }
-
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/util/AryInt.java b/chapter-modules/src/main/java/com/seaofnodes/simple/util/AryInt.java
deleted file mode 100644
index b498fd78..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/util/AryInt.java
+++ /dev/null
@@ -1,192 +0,0 @@
-package com.seaofnodes.simple.util;
-
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.function.IntUnaryOperator;
-
-// ArrayList with saner syntax
-public class AryInt {
-  public int[] _es;
-  public int _len;
-  public AryInt(int[] es) { this(es,es.length); }
-  public AryInt(int[] es, int len) { _es=es; _len=len; }
-  public AryInt() { this(new int[1],0); }
-
-  /** @return list is empty */
-  public boolean isEmpty() { return _len==0; }
-  /** @return active list length */
-  public int len() { return _len; }
-  /** @param i element index
-   *  @return element being returned; throws if OOB */
-  public int at( int i ) {
-    range_check(i);
-    return _es[i];
-  }
-  /** @param i element index
-   *  @return element being returned, or 0 if OOB */
-  public int atX( int i ) {
-    return i < _len ? _es[i] : 0;
-  }
-  /** @return last element */
-  public int last( ) { return at(_len-1); }
-  public int last(int x ) { return at(_len-1+x); }
-
-  /** @return remove and return last element */
-  public int pop( ) {
-    range_check(0);
-    return _es[--_len];
-  }
-
-  /** Add element in amortized constant time
-   *  @param e element to add at end of list
-   *  @return 'this' for flow-coding */
-  public AryInt push( int e ) {
-    if( _len >= _es.length ) _es = Arrays.copyOf(_es,Math.max(1,_es.length<<1));
-    _es[_len++] = e;
-    return this;
-  }
-
-  /** Slow, linear-time, element insert.  Preserves order.
-   *  @param i index to insert at, between 0 and _len inclusive.
-   *  @param e intlement to insert
-   */
-  public void insert( int i, int e ) {
-    if( i < 0 || i>_len )
-      throw new ArrayIndexOutOfBoundsException(""+i+" >= "+_len);
-    if( _len >= _es.length ) _es = Arrays.copyOf(_es,Math.max(1,_es.length<<1));
-    System.arraycopy(_es,i,_es,i+1,(_len++)-i);
-    _es[i] = e;
-  }
-
-  /** Fast, constant-time, element removal.  Does not preserve order
-   *  @param i element to be removed
-   *  @return element removed */
-  public int del( int i ) {
-    range_check(i);
-    int tmp = _es[i];
-    _es[i]=_es[--_len];
-    return tmp;
-  }
-
-  /** Slow, linear-time, element removal.  Preserves order.
-   *  @param i element to be removed
-   *  @return element removed */
-  public int remove( int i ) {
-    range_check(i);
-    int e = _es[i];
-    System.arraycopy(_es,i+1,_es,i,(--_len)-i);
-    return e;
-  }
-
-  /** Remove all elements */
-  public void clear( ) { Arrays.fill(_es,0,_len,0); _len=0; }
-
-  // Extend and set
-  public int setX( int i, int e ) {
-    while( i>= _es.length ) _es = Arrays.copyOf(_es,_es.length<<1);
-    if( i >= _len ) _len = i+1;
-    return (_es[i] = e);
-  }
-
-  public int set( int i, int e ) {
-    range_check(i);
-    return (_es[i] = e);
-  }
-
-  public AryInt set_as( int e ) { _es[0] = e; _len=1; return this; }
-  public AryInt set_len( int len ) {
-    if( len > _len )
-      while( len>= _es.length ) _es = Arrays.copyOf(_es,_es.length<<1);
-    _len = len;
-    while( _es.length > (len<<1) ) // Shrink if hugely too large
-      _es = Arrays.copyOf(_es,_es.length>>1);
-    return this;
-  }
-
-  /** @param c Collection to be added */
-  public AryInt addAll( Collection<? extends Integer> c ) { for( int e : c ) push(e); return this; }
-
-  /** @param es Array to be added */
-  public AryInt addAll( int[] es ) {
-    if( es.length==0 ) return this;
-    while( _len+es.length > _es.length ) _es = Arrays.copyOf(_es,_es.length<<1);
-    System.arraycopy(es,0,_es,_len,es.length);
-    _len += es.length;
-    return this;
-  }
-
-  /** @param es Array to be added */
-  public AryInt addAll( AryInt ary ) {
-    if( ary._len==0 ) return this;
-    while( _len+ary._len > _es.length ) _es = Arrays.copyOf(_es,_es.length<<1);
-    System.arraycopy(ary._es,0,_es,_len,ary._len);
-    _len += ary._len;
-    return this;
-  }
-
-  public AryInt map_update( IntUnaryOperator f ) { for( int i = 0; i<_len; i++ ) _es[i] = f.applyAsInt(_es[i]); return this; }
-
-  /** @return compact array version, using the internal base array where possible. */
-  public int[] asAry() { return _len==_es.length ? _es : Arrays.copyOf(_es,_len); }
-
-  /** Sorts in-place */
-  public void sort_update() { Arrays.sort(_es, 0, _len);  }
-  /** Find the first matching element using ==, or -1 if none.  Note that
-   *  most del calls shuffle the list, so the first element might be random.
-   *  @param e intlement to find
-   *  @return index of first matching element, or -1 if none */
-  public int find( int e ) {
-    for( int i=0; i<_len; i++ )  if( _es[i]==e )  return i;
-    return -1;
-  }
-
-  @Override public String toString() {
-    SB sb = new SB().p('[');
-    for( int i=0; i<_len; i++ )
-      sb.p(_es[i]).p(',');
-    return sb.unchar().p(']').toString();
-  }
-
-  private void range_check( int i ) {
-    if( i < 0 || i>=_len )
-      throw new ArrayIndexOutOfBoundsException(""+i+" >= "+_len);
-  }
-
-  // Binary search sorted _es.  Returns insertion point.
-  // Undefined results if _es is not sorted.
-  public int binary_search( int e ) {
-    int lo=0, hi=_len-1;
-    while( lo <= hi ) {
-      int mid = (hi + lo) >>> 1; // midpoint, rounded down
-      int mval = _es[mid];
-      if( e==mval ) {
-        // If dups, get to the first.
-        while( mid>0 && e==_es[mid-1] ) mid--;
-        return mid;
-      }
-      if( e >mval ) lo = mid+1;
-      else          hi = mid-1;
-    }
-    return lo;
-  }
-
-  // Note that the hashCode() and equals() are not invariant to changes in the
-  // underlying array.  If the hashCode() is used (e.g., inserting into a
-  // HashMap) and the then the array changes, the hashCode() will change also.
-  @Override public boolean equals( Object o ) {
-    if( this==o ) return true;
-    if( !(o instanceof AryInt ary) ) return false;
-    if( _len != ary._len ) return false;
-    if( _es == ary._es ) return true;
-    for( int i=0; i<_len; i++ )
-      if( _es[i] != ary._es[i] )
-        return false;
-    return true;
-  }
-  @Override public int hashCode( ) {
-    int sum=_len;
-    for( int i=0; i<_len; i++ )
-      sum += _es[i];
-    return sum;
-  }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/util/BAOS.java b/chapter-modules/src/main/java/com/seaofnodes/simple/util/BAOS.java
deleted file mode 100644
index 61ce7387..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/util/BAOS.java
+++ /dev/null
@@ -1,162 +0,0 @@
-package com.seaofnodes.simple.util;
-
-import java.util.HashMap;
-import java.util.Arrays;
-
-// "ByteArrayOutputStream", and Input Stream and not synchronized and has
-// matching pack/unpack strategies.
-public class BAOS {
-
-    private byte[] _buf;
-    private int _len;
-
-    public BAOS() { _buf = new byte[1]; }
-    public BAOS(byte[] buf) { _buf = buf; }
-    public BAOS(byte[] buf, int x) { _buf = buf; _len = x; }
-
-    public byte[] toByteArray() {
-        return Arrays.copyOf(_buf,_len);
-    }
-
-    public byte[] buf() { return _buf; }
-    public int size() { return _len; }
-    public void set( byte[] buf, int len ) { _buf=buf; _len=len; }
-    public void clear() { _len=0; }
-
-    // -----------------------------------------------------------------------
-    // Basic read, write (expand)
-
-    private void grow(int len) {
-        while( _len+len >= _buf.length )
-            _buf = Arrays.copyOf(_buf,_buf.length*2);
-    }
-
-    // Write a byte, grow as needed; silent chop
-    public BAOS write(int b) {
-        grow(1);
-        _buf[_len++] = (byte)b; // Silent chop
-        return this;
-    }
-
-    // Read an UNSIGNED bytes at INDEX, AIOOBE if off end
-    public int read1(int idx) { return _buf[idx] & 0xFF; }
-
-    // Read an UNSIGNED byte, AIOOBE if off end
-    public int read() { return read1(_len++); }
-
-    // write 2 bytes
-    public BAOS write2( int x ) {
-        grow(2);
-        _buf[_len++] = (byte)(x>> 0);
-        _buf[_len++] = (byte)(x>> 8);
-        return this;
-    }
-
-    // Read a u16 in 2 bytes
-    public int read2(int idx) { return read1(idx) | (read1(idx+1)<<8);  }
-    public int read2() { int rez = read2(_len); _len+=2; return rez; }
-
-    // write 4 bytes
-    public BAOS write4( int x ) {
-        grow(4);
-        _buf[_len++] = (byte)(x>> 0);
-        _buf[_len++] = (byte)(x>> 8);
-        _buf[_len++] = (byte)(x>>16);
-        _buf[_len++] = (byte)(x>>24);
-        return this;
-    }
-
-    // Read a i32 in 4 bytes
-    public int read4(int idx) { return read2(idx) | (read2(idx+2)<<16);  }
-    public int read4() { int rez = read4(_len); _len+=4; return rez; }
-
-    // write 8 bytes
-    public BAOS write8( long x ) {
-        write4((int) x     );
-        write4((int)(x>>32));
-        return this;
-    }
-
-    // Read a i64 in 8 bytes
-    public long read8(int idx) { return ((long)read4(idx) & 0xFFFFFFFFL) | ((long)read4(idx+4)<<32); }
-    public long read8() { long rez = read8(_len); _len+=8; return rez; }
-
-    // Write byte array
-    public void write( byte[] bs ) {
-        grow(bs.length);
-        System.arraycopy(bs,0,_buf,_len,bs.length);
-        _len += bs.length;
-    }
-
-    // Read/fill byte array
-    public byte[] read( byte[] bs ) {
-        System.arraycopy(_buf,_len,bs,0,bs.length);
-        _len += bs.length;
-        return bs;
-    }
-
-    // -----------------------------------------------------------------------
-    // Write a packed integer to the BAOS.  Track a histogram to make more
-    // intelligent choices in the future.
-    private static final HashMap<Long,Integer> PACKED_HISTOGRAM = new HashMap<>();
-    private BAOS histo(long x) {
-        Integer cnt = PACKED_HISTOGRAM.get(x);
-        PACKED_HISTOGRAM.put(x,cnt==null ? 1 : cnt+1);
-        return this;
-    }
-
-    // Write a u8 (checked)
-    public void packed1(int x) {
-        assert 0 <= x && x <= 255;
-        histo(x).write(x);
-    }
-
-    public int packed1() { return read(); }
-
-    // Write a u16 (checked)
-    public void packed2(int x) {
-        assert 0 <= x && x <= 65535;
-        (( x <= 254 ) ? write(x) : write(0xFF).write2(x)).histo(x);
-    }
-
-    // Read a packed u16
-    public int packed2() {
-        int x = read();
-        return x==0xFF ? read2() : x;
-    }
-
-    // Write a packed i32
-    public void packed4(int x) {
-        ((-127 <= x && x <= 127 ) ? write(x) : write(-128).write4(x)).histo(x);
-    }
-
-    // Read a packed i32
-    public int packed4() {
-        int x = _buf[_len++];   // Signed byte read
-        return x== -128 ? read4() : x;
-    }
-
-    // Write a packed i64
-    public void packed8(long x) {
-        ((-127 <= x && x <= 127 ) ? write((int)x) : write(-128).write8(x)).histo(x);
-    }
-
-    // Read a packed i64
-    public long packed8() {
-        int x = _buf[_len++];   // Signed byte read
-        return x== -128 ? read8() : x;
-    }
-
-    public void packedS(String s) {
-        packed4(s.length());
-        for( int i=0; i<s.length(); i++ )
-            packed4(s.charAt(i));
-    }
-
-    public String packedS() {
-        int len = packed4();
-        String s = new String(_buf,_len,len).intern();
-        _len += len;
-        return s;
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/util/IntHashMap.java b/chapter-modules/src/main/java/com/seaofnodes/simple/util/IntHashMap.java
deleted file mode 100644
index b356ec31..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/util/IntHashMap.java
+++ /dev/null
@@ -1,87 +0,0 @@
-package com.seaofnodes.simple.util;
-
-import java.util.Arrays;
-
-// Int-Int Hash Map
-public class IntHashMap {
-    private int[] _es;
-    private int _size;
-    private final int _sentinel;
-
-    // Pick a sentinel value; not allowed for keys or values.  Sentinel is
-    // returned on a miss.  Writing sentinel counts as a remove.
-    public IntHashMap(int sentinel) {
-        _sentinel = sentinel;
-        _es = new int[4];
-        Arrays.fill(_es,sentinel);
-    }
-
-    public int size() { return _size; }
-    public boolean isEmpty() { return _size==0; }
-    public void clear() {
-        _size = 0;
-        Arrays.fill(_es,_sentinel);
-    }
-
-    private int cap() { return _es.length>>1; }
-
-    public int put( int key, int val ) {
-        int slot = probe(key);
-        int old = _es[(slot<<1)+1];
-        if( old == _sentinel && val != _sentinel ) _size++;
-        if( old != _sentinel && val == _sentinel ) _size--;
-        // Check cap, resize at 3/4 full
-        if( _size > ((cap()>>1) + (cap()>>2)) ) {
-            grow();
-            slot = probe(key);
-        }
-
-        _es[ slot<<1   ] = key;
-        _es[(slot<<1)+1] = val;
-        return old;
-    }
-
-    public int get( int key ) {
-        int slot = probe(key);
-        return _es[(slot<<1)+1];
-    }
-
-    private int probe( int key ) {
-        int mask = cap()-1;
-        int slot = key & mask;
-        while( _es[slot<<1] != _sentinel && _es[slot<<1] != key )
-            slot = (slot + (key|1)) & mask;
-        return slot;
-    }
-
-    // Double underlying array size
-    private void grow() {
-        int[] old = _es;
-        _es = new int[_es.length<<1];
-        Arrays.fill(_es,_sentinel);
-        for( int i=0; i<old.length; i+=2 )
-            if( old[i] != _sentinel ) {
-                int slot = probe(old[i]);
-                _es[ slot<<1   ] = old[i  ];
-                _es[(slot<<1)+1] = old[i+1];
-            }
-    }
-
-    // Just all the keys
-    public int[] keySet() {
-        int[] keys = new int[_size];
-        int j=0;
-        for( int i=0; i<_es.length; i+=2 )
-            if( _es[i] != _sentinel )
-                keys[j++] = _es[i];
-        return keys;
-    }
-
-    @Override public String toString() {
-        SB sb = new SB().p("[ ");
-        for( int i=0; i<_es.length; i+=2 )
-            if( _es[i] != _sentinel )
-                sb.p('(').p(_es[i]).p(',').p(_es[i+1]).p(')').p(',');
-        return sb.unchar().p(']').toString();
-    }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/util/SB.java b/chapter-modules/src/main/java/com/seaofnodes/simple/util/SB.java
deleted file mode 100644
index cc59f2a6..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/util/SB.java
+++ /dev/null
@@ -1,99 +0,0 @@
-package com.seaofnodes.simple.util;
-
-/** Tight/tiny StringBuilder wrapper.
- *  Short short names on purpose; so they don't obscure the printing.
- *  Can't believe this wasn't done long, long ago. */
-public final class SB {
-  private final StringBuilder _sb;
-  private int _indent = 0;
-  public SB(        ) { _sb = new StringBuilder( ); }
-  public SB(String s) { _sb = new StringBuilder(s); }
-  public SB p( String s ) { _sb.append(s); return this; }
-  public SB p( float  s ) {
-    if( Float.isNaN(s) )
-      _sb.append( "Float.NaN");
-    else if( Float.isInfinite(s) ) {
-      _sb.append(s > 0 ? "Float.POSITIVE_INFINITY" : "Float.NEGATIVE_INFINITY");
-    } else _sb.append(s);
-    return this;
-  }
-  public SB p( double s ) {
-    if( Double.isNaN(s) )
-      _sb.append("Double.NaN");
-    else if( Double.isInfinite(s) ) {
-      _sb.append(s > 0 ? "Double.POSITIVE_INFINITY" : "Double.NEGATIVE_INFINITY");
-    } else _sb.append(s);
-    return this;
-  }
-  public SB p( char   s ) { _sb.append(s); return this; }
-  public SB p( int    s ) { _sb.append(s); return this; }
-  public SB p( long   s ) { _sb.append(s); return this; }
-  public SB p( boolean s) { _sb.append(s); return this; }
-  // 1 byte, 2 hex digits, 8 bits
-  public SB hex1(int s) {
-    int digit = (s>>4) & 0xf;
-    _sb.append((char)((digit <= 9 ? '0' : ('A'-10))+digit));
-    digit = s & 0xf;
-    _sb.append((char)((digit <= 9 ? '0' : ('A'-10))+digit));
-    return this;
-  }
-  // 2 bytes, 4 hex digits, 16 bits, Big Endian
-  public SB hex2(int s) { return hex1(s>> 8).hex1(s); }
-  // 4 bytes, 8 hex digits, 32 bits, Big Endian
-  public SB hex4(int s) { return hex2(s>>16).hex2(s); }
-  // 8 bytes, 16 hex digits, 64 bits, Big Endian
-  public SB hex8(long s) { return hex4((int)(s>>32)).hex4((int)s); }
-
-  // Fixed width field
-  public SB fix( int sz, String s ) {
-    for( int i=0; i<sz; i++ )
-      _sb.append( i < s.length() ? s.charAt(i) : ' ');
-    return this;
-  }
-  public char at(int idx ) { return _sb.charAt(idx); }
-
-  // Not spelled "p" on purpose: too easy to accidentally say "p(1.0)" and
-  // suddenly call the autoboxed version.
-  public SB pobj( Object s ) { _sb.append(s.toString()); return this; }
-  public SB i( int d ) { for( int i=0; i<d+_indent; i++ ) p("  "); return this; }
-  public SB i( ) { return i(0); }
-  public SB ip(String s) { return i().p(s); }
-  public SB s() { _sb.append(' '); return this; }
-
-  // Increase indentation
-  public SB ii( int i) { _indent += i; return this; }
-  public SB ii() { return ii(1); }
-  // Decrease indentation
-  public SB di( int i) { _indent -= i; return this; }
-  public SB di() { return di(1); }
-
-  public SB nl( ) { return p(System.lineSeparator()); }
-  // Last printed a nl
-  public boolean was_nl() {
-    int len = _sb.length();
-    String nl = System.lineSeparator();
-    int nlen = nl.length();
-    if( len < nlen ) return false;
-    for( int i=0; i<nlen; i++ )
-      if( _sb.charAt(len-nlen+i)!=nl.charAt(i) )
-        return false;
-    return true;
-  }
-
-  // Delete last char.  Useful when doing string-joins and JSON printing and an
-  // extra separater char needs to be removed:
-  //
-  //   sb.p('[');
-  //   for( Foo foo : foos )
-  //     sb.p(foo).p(',');
-  //   sb.unchar().p(']');  // remove extra trailing comma
-  //
-  public SB unchar() { return unchar(1); }
-  public SB unchar(int x) { _sb.setLength(_sb.length()-x); return this; }
-  public SB setLen(int len) { _sb.setLength(len); return this; }
-  public String subString(int start, int end ) { return _sb.substring(start,end); }
-
-  public SB clear() { _sb.setLength(0); return this; }
-  public int len() { return _sb.length(); }
-  @Override public String toString() { return _sb.toString(); }
-}
diff --git a/chapter-modules/src/main/java/com/seaofnodes/simple/util/Utils.java b/chapter-modules/src/main/java/com/seaofnodes/simple/util/Utils.java
deleted file mode 100644
index 577a60af..00000000
--- a/chapter-modules/src/main/java/com/seaofnodes/simple/util/Utils.java
+++ /dev/null
@@ -1,53 +0,0 @@
-package com.seaofnodes.simple.util;
-
-import java.util.ArrayList;
-
-public class Utils {
-    public static RuntimeException TODO() { return TODO("Not yet implemented"); }
-    public static RuntimeException TODO(String msg) { return new RuntimeException(msg); }
-
-    /**
-     *  Fast, constant-time, element removal.  Does not preserve order
-     *
-     *  @param array ArrayList to modify
-     *  @param i element to be removed
-     *  @return element removed
-     */
-    public static <E> void del(ArrayList<E> array, int i) {
-        E last = array.removeLast();
-        if (i < array.size()) array.set(i, last);
-    }
-
-    /**
-     * Search a list for an element by reference
-     *
-     * @param ary List to search in
-     * @param x Object to be searched
-     * @return >= 0 on success, -1 on failure
-     */
-    public static <E> int find( ArrayList<E> ary, E x ) {
-        for( int i=0; i<ary.size(); i++ )
-            if( ary.get(i)==x )
-                return i;
-        return -1;
-    }
-    /**
-     * Search a list for an element by reference
-     *
-     * @param ary List to search in
-     * @param x Object to be searched
-     * @return >= 0 on success, -1 on failure
-     */
-    public static <E> int find( E[] ary, E x ) {
-        for( int i=0; i<ary.length; i++ )
-            if( ary[i]==x )
-                return i;
-        return -1;
-    }
-
-    // Rotate a long, nice for hashes
-    public static long rot( long x, int n ) { return (x<<n) | (x>>>n); }
-
-    // Fold a 64bit hash into 32 bits
-    public static int fold( long x ) { return (int)((x>>32) ^ x); }
-}