x.c

AO_INLINE AO_t AO_fetch_compare_and_swap_full(volatile AO_t *addr,
                                              AO_t old, AO_t new_val)
{
  AO_t retval;
  __asm__ __volatile__ (
# ifndef __s390x__
    "     cs  %1,%2,0(%3)\n"
# else
    "     csg %1,%2,0(%3)\n"
# endif
  : "2" (retval), "+d" (old)
  : "d" (new_val), "a" (addr)
  : "cc", "memory");
  return retval;
}