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lizzie
41762940d6
test no regressions especially on Liiinux Signed-off-by: lizzie <lizzie@eden-emu.dev> Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4076 Reviewed-by: CamilleLaVey <camillelavey99@gmail.com> Reviewed-by: MaranBr <maranbr@eden-emu.dev>
58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: Copyright 2018 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 <bit>
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#include <climits>
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#include <cstddef>
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#include <type_traits>
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#include "common/common_types.h"
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namespace Common {
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/// Gets the size of a specified type T in bits.
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template <typename T>
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requires std::is_integral_v<T>
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[[nodiscard]] constexpr std::size_t BitSize() {
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return std::size_t(sizeof(T) * CHAR_BIT);
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}
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template<typename T>
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requires std::is_integral_v<T>
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[[nodiscard]] constexpr u32 MostSignificantBit(const T value) {
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return u32(sizeof(T) * CHAR_BIT - 1 - std::countl_zero(value));
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}
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template<typename T>
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requires std::is_integral_v<T>
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[[nodiscard]] constexpr T Log2Floor(const T value) {
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return T(MostSignificantBit<T>(value));
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}
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template<typename T>
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requires std::is_integral_v<T>
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[[nodiscard]] constexpr T Log2Ceil(const T value) {
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const T log2_f = Log2Floor<T>(value);
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return T(log2_f + T((value ^ (T(1ULL) << log2_f)) != T(0ULL)));
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}
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template <typename T>
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requires std::is_integral_v<T>
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[[nodiscard]] T NextPow2(T value) {
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return T(1ULL << (sizeof(T) * CHAR_BIT - std::countl_zero(value - 1U)));
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}
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template <size_t bit_index, typename T>
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requires std::is_integral_v<T>
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[[nodiscard]] constexpr bool Bit(const T value) {
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static_assert(bit_index < BitSize<T>(), "bit_index must be smaller than size of T");
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return ((value >> bit_index) & T(1)) == T(1);
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}
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} // namespace Common
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