v := c.regoff(&p.From)

		r := int(p.Reg)
		if r == 0 {
			r = int(p.To.Reg)
		}
		o1 = AOP_IRR(c.opirr(p.As), uint32(p.To.Reg), uint32(r), uint32(v))

	case 21: /* or $u32con,rx[,ry] => oris + ori (similar for xor) */
		var opu, opl uint32
		r := uint32(p.Reg)
		if r == 0 {
			r = uint32(p.To.Reg)
		}
		switch p.As {
		case AOR:
			opu, opl = OP_ORIS, OP_ORI