mirror of https://github.com/PCSX2/pcsx2.git
101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
// SPDX-FileCopyrightText: 2002-2024 PCSX2 Dev Team
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// SPDX-License-Identifier: GPL-3.0+
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#pragma once
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#include "common/Pcsx2Defs.h"
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#include <bit>
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#include <cstring>
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#ifdef _MSC_VER
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#include <intrin.h>
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#else
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static inline int _BitScanReverse(unsigned long* const Index, const unsigned long Mask)
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{
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if (Mask == 0)
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return 0;
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// For some reason, clang won't emit bsr if we use std::countl_zeros()...
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*Index = 31 - __builtin_clz(Mask);
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return 1;
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}
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#endif
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namespace Common
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{
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template <typename T>
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static constexpr __fi bool IsAligned(T value, unsigned int alignment)
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{
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return (value % static_cast<T>(alignment)) == 0;
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}
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template <typename T>
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static constexpr __fi T AlignUp(T value, unsigned int alignment)
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{
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return (value + static_cast<T>(alignment - 1)) / static_cast<T>(alignment) * static_cast<T>(alignment);
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}
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template <typename T>
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static constexpr __fi T AlignDown(T value, unsigned int alignment)
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{
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return value / static_cast<T>(alignment) * static_cast<T>(alignment);
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}
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template <typename T>
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static constexpr __fi bool IsAlignedPow2(T value, unsigned int alignment)
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{
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return (value & static_cast<T>(alignment - 1)) == 0;
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}
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template <typename T>
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static constexpr __fi T AlignUpPow2(T value, unsigned int alignment)
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{
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return (value + static_cast<T>(alignment - 1)) & static_cast<T>(~static_cast<T>(alignment - 1));
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}
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template <typename T>
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static constexpr __fi T AlignDownPow2(T value, unsigned int alignment)
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{
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return value & static_cast<T>(~static_cast<T>(alignment - 1));
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}
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template <typename T>
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static constexpr T PageAlign(T size)
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{
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static_assert(std::has_single_bit(__pagesize), "Page size is a power of 2");
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return Common::AlignUpPow2(size, __pagesize);
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}
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__fi static u32 CountLeadingSignBits(s32 n)
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{
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// If the sign bit is 1, we invert the bits to 0 for count-leading-zero.
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if (n < 0)
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n = ~n;
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// If BSR is used directly, it would have an undefined value for 0.
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if (n == 0)
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return 32;
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// Perform our count leading zero.
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return std::countl_zero(static_cast<u32>(n));
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}
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} // namespace Common
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template <typename T>
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[[maybe_unused]] __fi static T GetBufferT(const u8* buffer, u32 offset)
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{
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T value;
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std::memcpy(&value, buffer + offset, sizeof(value));
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return value;
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}
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[[maybe_unused]] __fi static u8 GetBufferU8(const u8* buffer, u32 offset) { return GetBufferT<u8>(buffer, offset); }
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[[maybe_unused]] __fi static u16 GetBufferU16(const u8* buffer, u32 offset) { return GetBufferT<u16>(buffer, offset); }
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[[maybe_unused]] __fi static u32 GetBufferU32(const u8* buffer, u32 offset) { return GetBufferT<u32>(buffer, offset); }
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[[maybe_unused]] __fi static u64 GetBufferU64(const u8* buffer, u32 offset) { return GetBufferT<u64>(buffer, offset); }
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