case loong64.LSX:
			arngType, ok = loong64LsxArngExtMap[ext]
			if !ok {
				return errors.New("Loong64 extension: invalid LSX arrangement type: " + ext)
			}

		case loong64.LASX:
			arngType, ok = loong64LasxArngExtMap[ext]
			if !ok {
				return errors.New("Loong64 extension: invalid LASX arrangement type: " + ext)
			}
		}

		a.Reg = loong64.REG_ARNG

	VFMLA	V1.B16, V12.B16, V3.B16                          // ERROR "invalid arrangement"
	VFMLA	V1.H4, V12.H4, V3.H4                             // ERROR "invalid arrangement"
	VFMLA	V1.H8, V12.H8, V3.H8                             // ERROR "invalid arrangement"
	VFMLA	V1.H4, V12.H4, V3.H4                             // ERROR "invalid arrangement"

			if err != nil {
				p.errorf("%v", err)
			}
			if firstReg == -1 {
				// only record the first register and arrangement
				firstReg = int(reg)
				nextReg = firstReg
				arrangement = curArrangement
			} else if curArrangement != arrangement {
				p.errorf("inconsistent arrangement in ARM64 register list")
			} else if nextReg != int(reg) {
				p.errorf("incontiguous register in ARM64 register list: %s", name)

		return 0, errors.New("invalid register for shift operation")
	}
	return int64(reg&31)<<16 | int64(op)<<22 | int64(uint16(count)), nil
}

// ARM64RegisterArrangement constructs an ARM64 vector register arrangement.
func ARM64RegisterArrangement(reg int16, name, arng string) (int64, error) {
	var curQ, curSize uint16
	if name[0] != 'V' {
		return 0, errors.New("expect V0 through V31; found: " + name)
	}
	if reg < 0 {