mirror of https://github.com/PCSX2/pcsx2.git
99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2023 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "common/Pcsx2Defs.h"
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#include <bit>
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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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