From f3ca559f9fe58d221e2d465845932f92278a7928 Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Fri, 14 Mar 2025 12:24:17 -0700
Subject: Encoding driver ch21

---
 .../com/seaofnodes/simple/codegen/CodeGen.java     |  8 ++++----
 .../seaofnodes/simple/node/cpus/arm/OrIARM.java    | 22 ++++++++++++++++++++++
 .../com/seaofnodes/simple/node/cpus/arm/arm.java   |  9 ++++++++-
 3 files changed, 34 insertions(+), 5 deletions(-)
 create mode 100644 chapter21/src/main/java/com/seaofnodes/simple/node/cpus/arm/OrIARM.java

(limited to 'chapter21/src/main/java/com')

diff --git a/chapter21/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java b/chapter21/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java
index 214b597d..eb6d96f9 100644
--- a/chapter21/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java
+++ b/chapter21/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java
@@ -332,14 +332,14 @@ public class CodeGen {
     // ---------------------------
     // Encoding
     int _tEncode;
+    public Encoding _encoding;
     public CodeGen encode() {
         assert _phase == Phase.RegAlloc;
         _phase = Phase.Encoding;
         long t0 = System.currentTimeMillis();
-
-
-        //_tEncode = (int)(System.currentTimeMillis() - t0);
-        //throw Utils.TODO();
+        _encoding = new Encoding(this);
+        _encoding.encode();
+        _tEncode = (int)(System.currentTimeMillis() - t0);
         return this;
     }
     // Encoded binary, no relocation info
diff --git a/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/arm/OrIARM.java b/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/arm/OrIARM.java
new file mode 100644
index 00000000..68550926
--- /dev/null
+++ b/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/arm/OrIARM.java
@@ -0,0 +1,22 @@
+package com.seaofnodes.simple.node.cpus.arm;
+
+import com.seaofnodes.simple.*;
+import com.seaofnodes.simple.codegen.*;
+import com.seaofnodes.simple.node.*;
+
+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.RMASK; }
+    @Override public void encoding( Encoding enc ) { arm.imm_inst(enc,this,170,_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/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/arm/arm.java b/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/arm/arm.java
index ca92b63e..6fc0afec 100644
--- a/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/arm/arm.java
+++ b/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/arm/arm.java
@@ -395,7 +395,7 @@ public class arm extends Machine {
         case MulNode mul    -> new MulARM(mul);
         case NewNode nnn    -> new NewARM(nnn);
         case NotNode not    -> new NotARM(not);
-        case OrNode or      -> new OrARM(or);
+        case OrNode or      -> or(or);
         case ParmNode parm  -> new ParmARM(parm);
         case PhiNode phi    -> new PhiNode(phi);
         case ProjNode prj   -> new ProjARM(prj);
@@ -476,6 +476,13 @@ public class arm extends Machine {
         return new CallRRARM(call);
     }
 
+    private Node or(OrNode or) {
+        return or.in(2) instanceof ConstantNode off && off._con instanceof TypeInteger ti && imm12(ti)
+            ? new OrIARM(or, (int)ti.value())
+            : new OrARM(or);
+    }
+
+
     private static int off;
     private static Node idx;
     private Node st(StoreNode st) {
-- 
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