__asm__ __volatile__ ("lock; cmpxchgw %1,%2"
                      : "=a"(sPrev)
                      : "q"(aWith),
                        "m"(*(volatile acp_sint16_t *)aAddr),
                        "0"(aCmp)
                      : "memory");

__asm__ __volatile__ ("mov %%ebx,%%eaxnt"
                      "mov %%ecx,%%edxnt"
                      "lock; cmpxchg8b %1"
                      : "=&A"(sVal)
                      : "m"(*(volatile acp_sint64_t *)aAddr)
                      : "cc");

__asm__ __volatile__ ("lock; xaddq %0,%1"
                      : "+r"(sPrev), "+m"(*(volatile acp_sint64_t *)aAddr)
                      :
                      : "memory");