mirror of
https://github.com/mupen64plus-ae/parallel-rdp-standalone.git
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106 lines
2.5 KiB
C++
106 lines
2.5 KiB
C++
/* Copyright (c) 2017-2020 Hans-Kristian Arntzen
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#ifdef _MSC_VER
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#include <intrin.h>
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#endif
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namespace Util
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{
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#ifdef __GNUC__
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#define leading_zeroes(x) ((x) == 0 ? 32 : __builtin_clz(x))
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#define trailing_zeroes(x) ((x) == 0 ? 32 : __builtin_ctz(x))
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#define trailing_ones(x) __builtin_ctz(~uint32_t(x))
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#elif defined(_MSC_VER)
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namespace Internal
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{
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static inline uint32_t clz(uint32_t x)
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{
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unsigned long result;
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if (_BitScanReverse(&result, x))
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return 31 - result;
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else
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return 32;
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}
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static inline uint32_t ctz(uint32_t x)
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{
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unsigned long result;
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if (_BitScanForward(&result, x))
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return result;
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else
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return 32;
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}
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}
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#define leading_zeroes(x) ::Util::Internal::clz(x)
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#define trailing_zeroes(x) ::Util::Internal::ctz(x)
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#define trailing_ones(x) ::Util::Internal::ctz(~uint32_t(x))
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#else
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#error "Implement me."
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#endif
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template <typename T>
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inline void for_each_bit(uint32_t value, const T &func)
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{
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while (value)
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{
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uint32_t bit = trailing_zeroes(value);
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func(bit);
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value &= ~(1u << bit);
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}
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}
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template <typename T>
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inline void for_each_bit_range(uint32_t value, const T &func)
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{
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if (value == ~0u)
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{
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func(0, 32);
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return;
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}
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uint32_t bit_offset = 0;
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while (value)
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{
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uint32_t bit = trailing_zeroes(value);
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bit_offset += bit;
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value >>= bit;
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uint32_t range = trailing_ones(value);
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func(bit_offset, range);
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value &= ~((1u << range) - 1);
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}
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}
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inline uint32_t next_pow2(uint32_t v)
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{
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v--;
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v |= v >> 16;
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v |= v >> 8;
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v |= v >> 4;
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v |= v >> 2;
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v |= v >> 1;
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return v + 1;
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}
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} |