var simdReg int16

	switch {
	case reg >= loong64.REG_V0 && reg <= loong64.REG_V31:
		simdType = loong64.LSX
		simdReg = reg - loong64.REG_V0
	case reg >= loong64.REG_X0 && reg <= loong64.REG_X31:
		simdType = loong64.LASX
		simdReg = reg - loong64.REG_X0
	default:
		return errors.New("Loong64 extension: invalid LSX/LASX register: " + fmt.Sprintf("%d", reg))
	}

	if isIndex {
		arngType, ok = loong64ElemExtMap[ext]

		register[obj.Rconv(i)] = int16(i)
	}

	for i := loong64.REG_V0; i <= loong64.REG_V31; i++ {
		register[obj.Rconv(i)] = int16(i)
	}

	for i := loong64.REG_X0; i <= loong64.REG_X31; i++ {
		register[obj.Rconv(i)] = int16(i)
	}

	// Pseudo-registers.
	register["SB"] = RSB
	register["FP"] = RFP
	register["PC"] = RPC