2 files changed, 5 insertions, 3 deletions
diff --git a/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/riscv/BranchRISC.java b/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/riscv/BranchRISC.java
index c9e7a5b5..a0a4b6aa 100644
--- a/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/riscv/BranchRISC.java
+++ b/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/riscv/BranchRISC.java
@@ -29,7 +29,10 @@ public class BranchRISC extends IfNode implements MachNode, RIPRelSize {
     }
 
     @Override public StringBuilder _print1(StringBuilder sb, BitSet visited) {
-        in(1)._print0(sb.append("if( "),visited).append(_bop);
+        sb.append("if( ");
+        if( in(1)==null ) sb.append("0");
+        else in(1)._print0(sb,visited);
+        sb.append(_bop);
         if( in(2)==null ) sb.append("0");
         else in(2)._print0(sb,visited);
         return sb.append(" )");
diff --git a/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/riscv/IntRISC.java b/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/riscv/IntRISC.java
index 1378d0f9..fbe8c984 100644
--- a/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/riscv/IntRISC.java
+++ b/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/riscv/IntRISC.java
@@ -9,8 +9,7 @@ import com.seaofnodes.simple.type.TypeInteger;
 // 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); }
-    public IntRISC(TypeInteger con) { super(con); }
+    public 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; }