diff options
Diffstat (limited to 'chapter05/src/main/java/com/seaofnodes')
| -rw-r--r-- | chapter05/src/main/java/com/seaofnodes/simple/node/ScopeNode.java | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/chapter05/src/main/java/com/seaofnodes/simple/node/ScopeNode.java b/chapter05/src/main/java/com/seaofnodes/simple/node/ScopeNode.java index 60d2bd43..ba4758e4 100644 --- a/chapter05/src/main/java/com/seaofnodes/simple/node/ScopeNode.java +++ b/chapter05/src/main/java/com/seaofnodes/simple/node/ScopeNode.java @@ -116,7 +116,8 @@ public class ScopeNode extends Node { public RegionNode mergeScopes(ScopeNode that) { RegionNode r = (RegionNode)ctrl(new RegionNode(ctrl(), that.ctrl()).peephole()); for( int i=1; i<nIns(); i++ ) - set_def(i,new PhiNode(r, in(i), that.in(i)).peephole()); + if( in(1) != that.in(i) ) // No need for redundant Phis + set_def(i,new PhiNode(r, in(i), that.in(i)).peephole()); that.kill(); // Kill merged scope return r; } |