default:
		return 0, errors.New("invalid arrangement in ARM64 register list")
	}
	return (int64(curQ) & 1 << 30) | (int64(curSize&3) << 10), nil
}

// ARM64RegisterListOffset generates offset encoding according to AArch64 specification.
func ARM64RegisterListOffset(firstReg, regCnt int, arrangement int64) (int64, error) {
	offset := int64(firstReg)
	switch regCnt {
	case 1:
		offset |= 0x7 << 12
	case 2:

		}
		if p.peek() != ']' {
			p.get(',')
		}
	}
	a.Type = obj.TYPE_REGLIST
	switch p.arch.Family {
	case sys.ARM:
		a.Offset = int64(bits)
	case sys.ARM64:
		offset, err := arch.ARM64RegisterListOffset(firstReg, regCnt, arrangement)
		if err != nil {
			p.errorf("%v", err)
		}
		a.Offset = offset
	default:
		p.errorf("register list not supported on this architecture")
	}
}