48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
// Copyright 2018 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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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 "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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[[nodiscard]] constexpr std::size_t BitSize() {
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return sizeof(T) * CHAR_BIT;
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}
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[[nodiscard]] constexpr u32 MostSignificantBit32(const u32 value) {
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return 31U - static_cast<u32>(std::countl_zero(value));
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}
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[[nodiscard]] constexpr u32 MostSignificantBit64(const u64 value) {
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return 63U - static_cast<u32>(std::countl_zero(value));
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}
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[[nodiscard]] constexpr u32 Log2Floor32(const u32 value) {
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return MostSignificantBit32(value);
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}
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[[nodiscard]] constexpr u32 Log2Floor64(const u64 value) {
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return MostSignificantBit64(value);
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}
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[[nodiscard]] constexpr u32 Log2Ceil32(const u32 value) {
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const u32 log2_f = Log2Floor32(value);
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return log2_f + static_cast<u32>((value ^ (1U << log2_f)) != 0U);
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}
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[[nodiscard]] constexpr u32 Log2Ceil64(const u64 value) {
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const u64 log2_f = Log2Floor64(value);
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return static_cast<u32>(log2_f + static_cast<u64>((value ^ (1ULL << log2_f)) != 0ULL));
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}
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} // namespace Common
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