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