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libobs/util/util_uint64.h
34 строки
1 KB
Ryan Foster
Revert "libobs: Improve util_mul_div64 outside MSVC"
17 апр 2023, 03:29
17 апр 2023, 03:29
ba263ee
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/* * Copyright (c) 2020 Hans Petter Selasky <hps@selasky.org> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #pragma once #if defined(_MSC_VER) && defined(_M_X64) #include <intrin.h> #endif static inline uint64_t util_mul_div64(uint64_t num, uint64_t mul, uint64_t div) { #if defined(_MSC_VER) && defined(_M_X64) && (_MSC_VER >= 1920) unsigned __int64 high; const unsigned __int64 low = _umul128(num, mul, &high); unsigned __int64 rem; return _udiv128(high, low, div, &rem); #else const uint64_t rem = num % div; return (num / div) * mul + (rem * mul) / div; #endif }