bits |= b
			continue
		}
		if b, present := scond[name]; present {
			bits = (bits &^ arm.C_SCOND) | b
			continue
		}
		return 0, false
	}
	return bits, true
}

func armRegisterNumber(name string, n int16) (int16, bool) {
	if n < 0 || 15 < n {
		return 0, false
	}
	switch name {
	case "R":
		return arm.REG_R0 + n, true
	case "F":
		return arm.REG_F0 + n, true
	}

	instructions["MCR"] = aMCR

	return &Arch{
		LinkArch:       &arm.Linkarm,
		Instructions:   instructions,
		Register:       register,
		RegisterPrefix: registerPrefix,
		RegisterNumber: armRegisterNumber,
		IsJump:         jumpArm,
	}
}

func archArm64() *Arch {
	register := make(map[string]int16)
	// Create maps for easy lookup of instruction names etc.