diff -r d8abc90163a4 -r 9a72c7ece7fb src/share/vm/opto/connode.cpp
--- a/src/share/vm/opto/connode.cpp	Mon Feb 20 13:11:08 2012 -0800
+++ b/src/share/vm/opto/connode.cpp	Tue Feb 21 11:55:05 2012 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1051,6 +1051,7 @@
 //------------------------------Value------------------------------------------
 const Type *CastX2PNode::Value( PhaseTransform *phase ) const {
   const Type* t = phase->type(in(1));
+  if (t == Type::TOP) return Type::TOP;
   if (t->base() == Type_X && t->singleton()) {
     uintptr_t bits = (uintptr_t) t->is_intptr_t()->get_con();
     if (bits == 0)   return TypePtr::NULL_PTR;
@@ -1121,6 +1122,7 @@
 //------------------------------Value------------------------------------------
 const Type *CastP2XNode::Value( PhaseTransform *phase ) const {
   const Type* t = phase->type(in(1));
+  if (t == Type::TOP) return Type::TOP;
   if (t->base() == Type::RawPtr && t->singleton()) {
     uintptr_t bits = (uintptr_t) t->is_rawptr()->get_con();
     return TypeX::make(bits);