*** old/src/os_cpu/bsd_x86/vm/atomic_bsd_x86.inline.hpp	Thu Sep 11 23:19:43 2014
--- new/src/os_cpu/bsd_x86/vm/atomic_bsd_x86.inline.hpp	Thu Sep 11 23:19:43 2014

*** 86,95 ****
--- 86,103 ----
  
  inline void*    Atomic::xchg_ptr(void*    exchange_value, volatile void*     dest) {
    return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
  }
  
+ inline jbyte    Atomic::cmpxchg    (jbyte    exchange_value, volatile jbyte*    dest, jbyte    compare_value) {
+   int mp = os::is_MP();
+   __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgb %1,(%3)"
+                     : "=a" (exchange_value)
+                     : "q" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp)
+                     : "cc", "memory");
+   return exchange_value;
+ }
  
  inline jint     Atomic::cmpxchg    (jint     exchange_value, volatile jint*     dest, jint     compare_value) {
    int mp = os::is_MP();
    __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)"
                      : "=a" (exchange_value)