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[common] rework BitField and BitUtil, use concepts whenever possible (#4076)

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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>
This commit is contained in:
lizzie 2026-07-09 03:47:04 +02:00 • committed by crueter
parent c2e74a9380
commit 41762940d6
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31 changed files with 529 additions and 757 deletions
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47
src/common/bit_util.h
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@ -1,3 +1,6 @@
// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
@ -14,46 +17,34 @@ namespace Common {
/// Gets the size of a specified type T in bits.
template <typename T>
requires std::is_integral_v<T>
[[nodiscard]] constexpr std::size_t BitSize() {
return sizeof(T) * CHAR_BIT;
return std::size_t(sizeof(T) * CHAR_BIT);
}
[[nodiscard]] constexpr u32 MostSignificantBit32(const u32 value) {
return 31U - static_cast<u32>(std::countl_zero(value));
template<typename T>
requires std::is_integral_v<T>
[[nodiscard]] constexpr u32 MostSignificantBit(const T value) {
return u32(sizeof(T) * CHAR_BIT - 1 - std::countl_zero(value));
}
[[nodiscard]] constexpr u32 MostSignificantBit64(const u64 value) {
return 63U - static_cast<u32>(std::countl_zero(value));
template<typename T>
requires std::is_integral_v<T>
[[nodiscard]] constexpr T Log2Floor(const T value) {
return T(MostSignificantBit<T>(value));
}
[[nodiscard]] constexpr u32 Log2Floor32(const u32 value) {
return MostSignificantBit32(value);
}
[[nodiscard]] constexpr u32 Log2Floor64(const u64 value) {
return MostSignificantBit64(value);
}
[[nodiscard]] constexpr u32 Log2Ceil32(const u32 value) {
const u32 log2_f = Log2Floor32(value);
return log2_f + static_cast<u32>((value ^ (1U << log2_f)) != 0U);
}
[[nodiscard]] constexpr u32 Log2Ceil64(const u64 value) {
const u64 log2_f = Log2Floor64(value);
return static_cast<u32>(log2_f + static_cast<u64>((value ^ (1ULL << log2_f)) != 0ULL));
}
template <typename T>
requires std::is_unsigned_v<T>
[[nodiscard]] constexpr bool IsPow2(T value) {
return std::has_single_bit(value);
template<typename T>
requires std::is_integral_v<T>
[[nodiscard]] constexpr T Log2Ceil(const T value) {
const T log2_f = Log2Floor<T>(value);
return T(log2_f + T((value ^ (T(1ULL) << log2_f)) != T(0ULL)));
}
template <typename T>
requires std::is_integral_v<T>
[[nodiscard]] T NextPow2(T value) {
return static_cast<T>(1ULL << ((8U * sizeof(T)) - std::countl_zero(value - 1U)));
return T(1ULL << (sizeof(T) * CHAR_BIT - std::countl_zero(value - 1U)));
}
template <size_t bit_index, typename T>