# HG changeset patch
# User Andreas Woess <andreas.woess@jku.at>
# Date 1329838542 -3600
# Node ID c3de4449719f291dbe4d6ae4fa4a44e561863425
# Parent  ac9ab44b75fd60e84ab8ef39e620ffc60ca4bf18
Don't emit moves for constants that are used only in frame states.

diff -r ac9ab44b75fd -r c3de4449719f graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/ConstantNode.java
--- a/graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/ConstantNode.java	Tue Feb 21 16:18:48 2012 +0100
+++ b/graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/ConstantNode.java	Tue Feb 21 16:35:42 2012 +0100
@@ -25,6 +25,7 @@
 import com.oracle.max.cri.ci.*;
 import com.oracle.max.cri.ri.*;
 import com.oracle.max.graal.graph.*;
+import com.oracle.max.graal.graph.iterators.*;
 import com.oracle.max.graal.nodes.spi.*;
 import com.oracle.max.graal.nodes.type.*;
 
@@ -52,13 +53,17 @@
 
     @Override
     public void generate(LIRGeneratorTool gen) {
-        if (gen.canInlineConstant(value)) {
+        if (gen.canInlineConstant(value) || onlyUsedInFrameState()) {
             gen.setResult(this, value);
         } else {
             gen.setResult(this, gen.emitMove(value));
         }
     }
 
+    private boolean onlyUsedInFrameState() {
+        return usages().filter(NodePredicates.isNotA(FrameState.class)).isEmpty();
+    }
+
     public static ConstantNode forCiConstant(CiConstant constant, RiRuntime runtime, Graph graph) {
         return graph.unique(new ConstantNode(constant, runtime));
     }