__XCHG_CASE
__XCHG_CASE(w, b, , 8, , , , , , )
__XCHG_CASE(w, h, , 16, , , , , , )
__XCHG_CASE(w, , , 32, , , , , , )
__XCHG_CASE( , , , 64, , , , , , )
__XCHG_CASE(w, b, acq_, 8, , , a, a, , "memory")
__XCHG_CASE(w, h, acq_, 16, , , a, a, , "memory")
__XCHG_CASE(w, , acq_, 32, , , a, a, , "memory")
__XCHG_CASE( , , acq_, 64, , , a, a, , "memory")
__XCHG_CASE(w, b, rel_, 8, , , , , l, "memory")
__XCHG_CASE(w, h, rel_, 16, , , , , l, "memory")
__XCHG_CASE(w, , rel_, 32, , , , , l, "memory")
__XCHG_CASE( , , rel_, 64, , , , , l, "memory")
__XCHG_CASE(w, b, mb_, 8, dmb ish, nop, , a, l, "memory")
__XCHG_CASE(w, h, mb_, 16, dmb ish, nop, , a, l, "memory")
__XCHG_CASE(w, , mb_, 32, dmb ish, nop, , a, l, "memory")
__XCHG_CASE( , , mb_, 64, dmb ish, nop, , a, l, "memory")
#undef __XCHG_CASE