--- old/src/share/vm/opto/connode.cpp	Fri Feb 17 16:23:59 2012
+++ new/src/share/vm/opto/connode.cpp	Fri Feb 17 16:23:59 2012
@@ -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);