mirror of
https://github.com/PCSX2/pcsx2.git
synced 2025-12-16 04:08:48 +00:00
135 lines
3.3 KiB
C++
135 lines
3.3 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
|
|
* Copyright (C) 2002-2023 PCSX2 Dev Team
|
|
*
|
|
* PCSX2 is free software: you can redistribute it and/or modify it under the terms
|
|
* of the GNU Lesser General Public License as published by the Free Software Found-
|
|
* ation, either version 3 of the License, or (at your option) any later version.
|
|
*
|
|
* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
|
|
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
* PURPOSE. See the GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with PCSX2.
|
|
* If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "common/Pcsx2Defs.h"
|
|
|
|
#include <bit>
|
|
|
|
#ifdef _MSC_VER
|
|
|
|
#include <intrin.h>
|
|
|
|
#else
|
|
|
|
static inline int _BitScanReverse(unsigned long* const Index, const unsigned long Mask)
|
|
{
|
|
if (Mask == 0)
|
|
return 0;
|
|
|
|
// For some reason, clang won't emit bsr if we use std::countl_zeros()...
|
|
*Index = 31 - __builtin_clz(Mask);
|
|
return 1;
|
|
}
|
|
|
|
#endif
|
|
|
|
namespace Common
|
|
{
|
|
template <typename T>
|
|
static constexpr __fi bool IsAligned(T value, unsigned int alignment)
|
|
{
|
|
return (value % static_cast<T>(alignment)) == 0;
|
|
}
|
|
|
|
template <typename T>
|
|
static constexpr __fi T AlignUp(T value, unsigned int alignment)
|
|
{
|
|
return (value + static_cast<T>(alignment - 1)) / static_cast<T>(alignment) * static_cast<T>(alignment);
|
|
}
|
|
|
|
template <typename T>
|
|
static constexpr __fi T AlignDown(T value, unsigned int alignment)
|
|
{
|
|
return value / static_cast<T>(alignment) * static_cast<T>(alignment);
|
|
}
|
|
|
|
template <typename T>
|
|
static constexpr __fi bool IsAlignedPow2(T value, unsigned int alignment)
|
|
{
|
|
return (value & static_cast<T>(alignment - 1)) == 0;
|
|
}
|
|
|
|
template <typename T>
|
|
static constexpr __fi T AlignUpPow2(T value, unsigned int alignment)
|
|
{
|
|
return (value + static_cast<T>(alignment - 1)) & static_cast<T>(~static_cast<T>(alignment - 1));
|
|
}
|
|
|
|
template <typename T>
|
|
static constexpr __fi T AlignDownPow2(T value, unsigned int alignment)
|
|
{
|
|
return value & static_cast<T>(~static_cast<T>(alignment - 1));
|
|
}
|
|
|
|
template <typename T>
|
|
static constexpr __fi bool IsPow2(T value)
|
|
{
|
|
return (value & (value - 1)) == 0;
|
|
}
|
|
|
|
template <typename T>
|
|
static constexpr __fi T PreviousPow2(T value)
|
|
{
|
|
if (value == static_cast<T>(0))
|
|
return 0;
|
|
|
|
value |= (value >> 1);
|
|
value |= (value >> 2);
|
|
value |= (value >> 4);
|
|
value |= (value >> 8);
|
|
value |= (value >> 16);
|
|
return value - (value >> 1);
|
|
}
|
|
|
|
template<typename T>
|
|
static constexpr __fi T NextPow2(T value)
|
|
{
|
|
if (value == static_cast<T>(0))
|
|
return 0;
|
|
|
|
value--;
|
|
value |= value >> 1;
|
|
value |= value >> 2;
|
|
value |= value >> 4;
|
|
value |= value >> 8;
|
|
value |= value >> 16;
|
|
value++;
|
|
return value;
|
|
}
|
|
|
|
template <typename T>
|
|
static constexpr T PageAlign(T size)
|
|
{
|
|
static_assert(Common::IsPow2(__pagesize), "Page size is a power of 2");
|
|
return Common::AlignUpPow2(size, __pagesize);
|
|
}
|
|
|
|
__fi static u32 CountLeadingSignBits(s32 n)
|
|
{
|
|
// If the sign bit is 1, we invert the bits to 0 for count-leading-zero.
|
|
if (n < 0)
|
|
n = ~n;
|
|
|
|
// If BSR is used directly, it would have an undefined value for 0.
|
|
if (n == 0)
|
|
return 32;
|
|
|
|
// Perform our count leading zero.
|
|
return std::countl_zero(static_cast<u32>(n));
|
|
}
|
|
} // namespace Common
|