ASM_FMT_B7
op = ASM_OP_BRP_, fmt = ASM_FMT_B7;
op = ASM_OP_BRP_RET, fmt = ASM_FMT_B7;
if (fmt != ASM_FMT_B6 && fmt != ASM_FMT_B7)
case ASM_FMT_B7: /* 0 dst */