--- a/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/cfs/FlowSensitiveReductionPhase.java	Mon Apr 28 15:05:42 2014 +0200
+++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/cfs/FlowSensitiveReductionPhase.java	Tue Apr 29 14:33:09 2014 +0200
@@ -43,7 +43,9 @@
     @Override
     protected final void run(StructuredGraph graph, PhaseContext context) {
         try (Debug.Scope s = Debug.scope("FlowSensitiveReduction")) {
+            Debug.dump(graph, "FlowSensitiveReduction initial");
             new FlowSensitiveReduction(graph.start(), new State(), context).apply();
+            Debug.dump(graph, "FlowSensitiveReduction done");
         } catch (Throwable e) {
             throw Debug.handle(e);
         }

--- a/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/cfs/State.java	Mon Apr 28 15:05:42 2014 +0200
+++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/cfs/State.java	Tue Apr 29 14:33:09 2014 +0200
@@ -283,6 +283,8 @@
         if (isUnreachable) {
             typeRefinements.clear();
             knownNull.clear();
+            trueFacts.clear();
+            falseFacts.clear();
             return true;
         }
 
@@ -789,6 +791,7 @@
      * @return true iff `value` may lose dependency not covered by `anchor`.
      */
     public static boolean isDependencyTainted(ValueNode value, GuardingNode anchor) {
+        assert anchor instanceof FixedNode;
         if (value instanceof ValueProxy) {
             if (value instanceof GuardedNode) {
                 GuardedNode gn = (GuardedNode) value;
@@ -814,6 +817,8 @@
         isUnreachable = false;
         typeRefinements.clear();
         knownNull.clear();
+        trueFacts.clear();
+        falseFacts.clear();
     }
 
 }