--- a/hotspot/src/share/vm/c1/c1_LIRGenerator.cpp	Tue Oct 12 02:21:06 2010 -0700
+++ b/hotspot/src/share/vm/c1/c1_LIRGenerator.cpp	Tue Oct 12 23:51:20 2010 -0700
@@ -1350,6 +1350,7 @@
     addr = ptr;
   }
   assert(addr->is_register(), "must be a register at this point");
+  assert(addr->type() == T_OBJECT, "addr should point to an object");
 
   LIR_Opr xor_res = new_pointer_register();
   LIR_Opr xor_shift_res = new_pointer_register();