--- old/src/cpu/x86/vm/c1_CodeStubs_x86.cpp	2012-01-24 10:05:01.811429560 -0800
+++ new/src/cpu/x86/vm/c1_CodeStubs_x86.cpp	2012-01-24 10:05:01.739431334 -0800
@@ -520,7 +520,7 @@
   __ load_klass(tmp_reg, src_reg);
 
   Address ref_type_adr(tmp_reg, instanceKlass::reference_type_offset());
-  __ cmpl(ref_type_adr, REF_NONE);
+  __ cmpb(ref_type_adr, REF_NONE);
   __ jcc(Assembler::equal, _continuation);
 
   // Is marking active?