ASM_FMT_M16
op = ASM_OP_CMPXCHG1_ACQ, fmt = ASM_FMT_M16;
op = ASM_OP_CMPXCHG2_ACQ, fmt = ASM_FMT_M16;
op = ASM_OP_CMPXCHG4_ACQ, fmt = ASM_FMT_M16;
op = ASM_OP_CMPXCHG8_ACQ, fmt = ASM_FMT_M16;
op = ASM_OP_CMPXCHG1_REL, fmt = ASM_FMT_M16;
op = ASM_OP_CMPXCHG2_REL, fmt = ASM_FMT_M16;
op = ASM_OP_CMPXCHG4_REL, fmt = ASM_FMT_M16;
op = ASM_OP_CMPXCHG8_REL, fmt = ASM_FMT_M16;
op = ASM_OP_XCHG1, fmt = ASM_FMT_M16;
op = ASM_OP_XCHG2, fmt = ASM_FMT_M16;
op = ASM_OP_XCHG4, fmt = ASM_FMT_M16;
op = ASM_OP_XCHG8, fmt = ASM_FMT_M16;
op = ASM_OP_CMP8XCHG16_ACQ, fmt = ASM_FMT_M16;
op = ASM_OP_CMP8XCHG16_REL, fmt = ASM_FMT_M16;
case ASM_FMT_M16: