case A0 <= r && r <= A7:
		return fmt.Sprintf("a%d", int(r-A0))
	default:
		return fmt.Sprintf("Reg(%d)", int(r))
	}
}

// CondReg is a bit or field in the condition register.
type CondReg int8

const (
	_ CondReg = iota
	// Condition Regster bits
	Cond0LT
	Cond0GT
	Cond0EQ
	Cond0SO
	Cond1LT
	Cond1GT
	Cond1EQ
	Cond1SO
	Cond2LT
	Cond2GT
	Cond2EQ

	switch a.Type {
	default:
		return nil
	case TypeUnknown:
		return nil
	case TypeReg:
		return R0 + Reg(a.BitFields.Parse(i))
	case TypeCondRegBit:
		return Cond0LT + CondReg(a.BitFields.Parse(i))
	case TypeCondRegField:
		return CR0 + CondReg(a.BitFields.Parse(i))
	case TypeFPReg:
		return F0 + Reg(a.BitFields.Parse(i))
	case TypeVecReg:
		return V0 + Reg(a.BitFields.Parse(i))
	case TypeVecSReg: