Function GetShiftedRegister

arch/arm64/il.cpp:193–262

}

static ExprId GetShiftedRegister(
    LowLevelILFunction& il, InstructionOperand& operand, size_t regNum, size_t resultSize)
{
	ExprId res;

	// peel off the variants that return early
	switch (operand.shiftType)
	{
	case ShiftType_NONE:
		res = ExtractRegister(il, operand, regNum, REGSZ_O(operand), false, resultSize);
		return res;
	case ShiftType_ASR:
		res = ExtractRegister(il, operand, regNum, REGSZ_O(operand), false, resultSize);
		if (operand.shiftValue)
			res = il.ArithShiftRight(resultSize, res, il.Const(1, operand.shiftValue));
		return res;
	case ShiftType_LSR:
		res = ExtractRegister(il, operand, regNum, REGSZ_O(operand), false, resultSize);
		if (operand.shiftValue)
			res = il.LogicalShiftRight(resultSize, res, il.Const(1, operand.shiftValue));
		return res;
	case ShiftType_ROR:
		res = ExtractRegister(il, operand, regNum, REGSZ_O(operand), false, resultSize);
		if (operand.shiftValue)
			res = il.RotateRight(resultSize, res, il.Const(1, operand.shiftValue));
		return res;
	default:
		break;
	}

	// everything else falls through to maybe be left shifted
	switch (operand.shiftType)
	{
	case ShiftType_LSL:
		res = ExtractRegister(il, operand, regNum, REGSZ_O(operand), false, resultSize);
		break;
	case ShiftType_SXTB:
		res = ExtractRegister(il, operand, regNum, 1, true, resultSize);
		break;
	case ShiftType_SXTH:
		res = ExtractRegister(il, operand, regNum, 2, true, resultSize);
		break;
	case ShiftType_SXTW:
		res = ExtractRegister(il, operand, regNum, 4, true, resultSize);
		break;
	case ShiftType_SXTX:
		res = ExtractRegister(il, operand, regNum, 8, true, resultSize);
		break;
	case ShiftType_UXTB:
		res = ExtractRegister(il, operand, regNum, 1, false, resultSize);
		break;
	case ShiftType_UXTH:
		res = ExtractRegister(il, operand, regNum, 2, false, resultSize);
		break;
	case ShiftType_UXTW:
		res = ExtractRegister(il, operand, regNum, 4, false, resultSize);
		break;
	case ShiftType_UXTX: