diff -r da4dd142ea01 -r 52b5d32fbfaf src/cpu/x86/vm/c1_LIRAssembler_x86.cpp
--- a/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp	Tue Nov 29 14:44:44 2011 -0500
+++ b/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp	Tue Dec 06 18:28:51 2011 -0500
@@ -1557,7 +1557,7 @@
 
 void LIR_Assembler::emit_alloc_obj(LIR_OpAllocObj* op) {
   if (op->init_check()) {
-    __ cmpl(Address(op->klass()->as_register(),
+    __ cmpb(Address(op->klass()->as_register(),
                     instanceKlass::init_state_offset_in_bytes() + sizeof(oopDesc)),
             instanceKlass::fully_initialized);
     add_debug_info_for_null_check_here(op->stub()->info());