diff -r b4ce4e9eb97d -r 085b304a1cc5 src/share/vm/opto/subnode.cpp
--- a/src/share/vm/opto/subnode.cpp	Thu Mar 13 10:18:59 2014 -0700
+++ b/src/share/vm/opto/subnode.cpp	Thu Jan 23 12:08:28 2014 +0100
@@ -1126,11 +1126,15 @@
   Node *cmp = in(1);
   if( !cmp->is_Sub() ) return NULL;
   int cop = cmp->Opcode();
-  if( cop == Op_FastLock || cop == Op_FastUnlock || cop == Op_FlagsProj) return NULL;
+  if( cop == Op_FastLock || cop == Op_FastUnlock) return NULL;
   Node *cmp1 = cmp->in(1);
   Node *cmp2 = cmp->in(2);
   if( !cmp1 ) return NULL;
 
+  if (_test._test == BoolTest::overflow || _test._test == BoolTest::no_overflow) {
+    return NULL;
+  }
+
   // Constant on left?
   Node *con = cmp1;
   uint op2 = cmp2->Opcode();