--- a/src/share/vm/opto/compile.cpp	Tue Jun 24 16:00:14 2008 -0700
+++ b/src/share/vm/opto/compile.cpp	Thu Jun 26 13:34:00 2008 -0700
@@ -1069,7 +1069,7 @@
       // No constant oop pointers (such as Strings); they alias with
       // unknown strings.
       tj = to = TypeInstPtr::make(TypePtr::BotPTR,to->klass(),false,0,offset);
-    } else if( to->is_instance_field() ) {
+    } else if( to->is_known_instance_field() ) {
       tj = to; // Keep NotNull and klass_is_exact for instance type
     } else if( ptr == TypePtr::NotNull || to->klass_is_exact() ) {
       // During the 2nd round of IterGVN, NotNull castings are removed.
@@ -1190,8 +1190,8 @@
   _field = NULL;
   _is_rewritable = true; // default
   const TypeOopPtr *atoop = (at != NULL) ? at->isa_oopptr() : NULL;
-  if (atoop != NULL && atoop->is_instance()) {
-    const TypeOopPtr *gt = atoop->cast_to_instance(TypeOopPtr::UNKNOWN_INSTANCE);
+  if (atoop != NULL && atoop->is_known_instance()) {
+    const TypeOopPtr *gt = atoop->cast_to_instance_id(TypeOopPtr::InstanceBot);
     _general_index = Compile::current()->get_alias_index(gt);
   } else {
     _general_index = 0;