}
	}
	if reg <= arm64.REG_R31 && reg >= arm64.REG_R0 {
		if !isAmount {
			return errors.New("invalid register extension")
		}
		switch ext {
		case "UXTB":
			if a.Type == obj.TYPE_MEM {
				return errors.New("invalid shift for the register offset addressing mode")
			}
			a.Reg = arm64.REG_UXTB + Rnum
		case "UXTH":
			if a.Type == obj.TYPE_MEM {

	ANDS	$1, R0, RSP                                      // ERROR "illegal combination"
	ADDSW	R7->32, R14, R13                                 // ERROR "shift amount out of range 0 to 31"
	ADD	R1.UXTB<<5, R2, R3                               // ERROR "shift amount out of range 0 to 4"
	ADDS	R1.UXTX<<7, R2, R3                               // ERROR "shift amount out of range 0 to 4"

	ADD	$0x3fffffffc000, R5             // ADD	$70368744161280, R5               // fb7f72b2a5001b8b
	ADD	R1>>11, R2, R3
	ADD	R1<<22, R2, R3
	ADD	R1->33, R2, R3
	AND	R1@>33, R2, R3
	ADD	R1.UXTB, R2, R3                 // 4300218b
	ADD	R1.UXTB<<4, R2, R3              // 4310218b
	ADD	R2, RSP, RSP                    // ff63228b
	ADD	R2.SXTX<<1, RSP, RSP            // ffe7228b
	ADD	ZR.SXTX<<1, R2, R3              // 43e43f8b