func (i Imm_clrex) String() string {
	if i == 15 {
		return ""
	}
	return fmt.Sprintf("#%#x", uint32(i))
}

// An Imm_dcps is an integer constant for DCPS[123] instruction.
type Imm_dcps uint16

func (Imm_dcps) isArg() {}

func (i Imm_dcps) String() string {
	if i == 0 {
		return ""
	}
	return fmt.Sprintf("#%#x", uint32(i))
}

// Standard conditions.
type Cond struct {

	case Cond:
		switch arg.String() {
		case "CS":
			return "HS"
		case "CC":
			return "LO"
		}

	case Imm_clrex:
		return fmt.Sprintf("$%d", uint32(a))

	case Imm_dcps:
		return fmt.Sprintf("$%d", uint32(a))

	case Imm_option:
		return fmt.Sprintf("$%d", uint8(a))

	case Imm_hint:
		return fmt.Sprintf("$%d", uint8(a))

	case Imm_fp:

	case arg_immediate_optional_0_15_CRm:
		crm := (x >> 8) & (1<<4 - 1)
		return Imm_clrex(crm)

	case arg_immediate_optional_0_65535_imm16:
		imm16 := (x >> 5) & (1<<16 - 1)
		return Imm_dcps(imm16)

	case arg_immediate_OptLSL_amount_16_0_16:
		imm16 := (x >> 5) & (1<<16 - 1)
		hw := (x >> 21) & (1<<2 - 1)
		shift := hw * 16
		if shift > 16 {
			return nil
		}