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40 lines
950 B
C++
40 lines
950 B
C++
// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <algorithm>
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#include <type_traits>
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#include "bit_cast.h"
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namespace Common {
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template <typename T>
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requires(std::is_integral_v<T> && std::is_signed_v<T>)
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inline T WrappingAdd(T lhs, T rhs) {
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using U = std::make_unsigned_t<T>;
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U lhs_u = BitCast<U>(lhs);
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U rhs_u = BitCast<U>(rhs);
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return BitCast<T>(lhs_u + rhs_u);
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}
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template <typename T>
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requires(std::is_integral_v<T> && std::is_signed_v<T>)
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inline bool CanAddWithoutOverflow(T lhs, T rhs) {
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#ifdef _MSC_VER
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if (lhs >= 0 && rhs >= 0) {
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return WrappingAdd(lhs, rhs) >= std::max(lhs, rhs);
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} else if (lhs < 0 && rhs < 0) {
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return WrappingAdd(lhs, rhs) <= std::min(lhs, rhs);
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} else {
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return true;
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}
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#else
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T res;
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return !__builtin_add_overflow(lhs, rhs, &res);
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#endif
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}
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} // namespace Common
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