MD
#define MD(op, xop, rc) (OP (op) | ((((unsigned long)(xop)) & 0x7) << 2) | ((rc) & 1))
#define MD(_f, _m) { .flags = ((_f) | ModeDual), .u.mdual = (_m) }
#undef MD
enum { AC1, AC2, AC3, AC4, AC5, AC6, B1, B2, MB, MC, MD };
#define MD 0xffffffff
#define MD(x) (1 << (x))