case ASUB:
			if r == 0 {
				zRRE(op_SGR, uint32(p.To.Reg), uint32(p.From.Reg), asm)
			} else {
				zRRF(op_SGRK, uint32(p.From.Reg), 0, uint32(p.To.Reg), uint32(r), asm)
			}
		case ASUBC:
			if r == 0 {
				zRRE(op_SLGR, uint32(p.To.Reg), uint32(p.From.Reg), asm)
			} else {
				zRRF(op_SLGRK, uint32(p.From.Reg), 0, uint32(p.To.Reg), uint32(r), asm)
			}
		case ASUBE:
			if r == 0 {