*** old/src/share/vm/opto/parse2.cpp	Fri Jun 29 16:28:38 2012
--- new/src/share/vm/opto/parse2.cpp	Fri Jun 29 16:28:37 2012

*** 1276,1288 ****
--- 1276,1288 ----
         // Found:
         //   Bool(CmpP(LoadKlass(obj._klass), ConP(Foo.klass)), [eq])
         // or the narrowOop equivalent.
         const Type* obj_type = _gvn.type(obj);
         const TypeOopPtr* tboth = obj_type->join(con_type)->isa_oopptr();
!        if (tboth != NULL && tboth != obj_type && tboth->higher_equal(obj_type)) {
!        if (tboth != NULL && tboth->klass_is_exact() && tboth != obj_type &&
+            tboth->higher_equal(obj_type)) {
            // obj has to be of the exact type Foo if the CmpP succeeds.
            assert(tboth->klass_is_exact(), "klass should be exact");
            int obj_in_map = map()->find_edge(obj);
            JVMState* jvms = this->jvms();
            if (obj_in_map >= 0 &&
                (jvms->is_loc(obj_in_map) || jvms->is_stk(obj_in_map))) {
              TypeNode* ccast = new (C, 2) CheckCastPPNode(control(), obj, tboth);