diff -r 48d5e03f373f -r a224d6a24120 hotspot/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp
--- a/hotspot/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp	Tue Oct 12 02:21:06 2010 -0700
+++ b/hotspot/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp	Tue Oct 12 23:51:20 2010 -0700
@@ -1941,8 +1941,6 @@
       __ cmpxchgptr(newval, Address(addr, 0));
     } else if (op->code() == lir_cas_int) {
       __ cmpxchgl(newval, Address(addr, 0));
-    } else {
-      LP64_ONLY(__ cmpxchgq(newval, Address(addr, 0)));
     }
 #ifdef _LP64
   } else if (op->code() == lir_cas_long) {