--- a/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/TailDuplicationPhase.java	Fri May 02 14:10:16 2014 +0200
+++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/TailDuplicationPhase.java	Fri May 02 12:02:27 2014 +0200
@@ -25,6 +25,7 @@
 import static com.oracle.graal.compiler.common.GraalOptions.*;
 
 import java.util.*;
+import java.util.function.*;
 
 import com.oracle.graal.compiler.common.*;
 import com.oracle.graal.compiler.common.type.*;
@@ -153,13 +154,15 @@
 
     @Override
     protected void run(StructuredGraph graph, PhaseContext phaseContext) {
-        NodesToDoubles nodeProbabilities = new ComputeProbabilityClosure(graph).apply();
+        if (graph.hasNode(MergeNode.class)) {
+            ToDoubleFunction<FixedNode> nodeProbabilities = new FixedNodeProbabilityCache();
 
-        // A snapshot is taken here, so that new MergeNode instances aren't considered for tail
-        // duplication.
-        for (MergeNode merge : graph.getNodes(MergeNode.class).snapshot()) {
-            if (!(merge instanceof LoopBeginNode) && nodeProbabilities.get(merge) >= TailDuplicationProbability.getValue()) {
-                tailDuplicate(merge, DEFAULT_DECISION, null, phaseContext, canonicalizer);
+            // A snapshot is taken here, so that new MergeNode instances aren't considered for tail
+            // duplication.
+            for (MergeNode merge : graph.getNodes(MergeNode.class).snapshot()) {
+                if (!(merge instanceof LoopBeginNode) && nodeProbabilities.applyAsDouble(merge) >= TailDuplicationProbability.getValue()) {
+                    tailDuplicate(merge, DEFAULT_DECISION, null, phaseContext, canonicalizer);
+                }
             }
         }
     }