mirror of https://git.ffmpeg.org/ffmpeg.git
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/*
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* Copyright (c) 2015 James Almer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_X86_INTMATH_H
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#define AVUTIL_X86_INTMATH_H
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#include <stdint.h>
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#include "config.h"
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#if HAVE_FAST_CLZ
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#if defined(__INTEL_COMPILER)
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# define ff_log2(x) (_bit_scan_reverse((x)|1))
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# define ff_log2_16bit av_log2
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# define ff_ctz(v) _bit_scan_forward(v)
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# define ff_ctzll ff_ctzll_x86
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static av_always_inline av_const int ff_ctzll_x86(long long v)
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{
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# if ARCH_X86_64
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uint64_t c;
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__asm__("bsfq %1,%0" : "=r" (c) : "r" (v));
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return c;
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# else
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return ((uint32_t)v == 0) ? _bit_scan_forward((uint32_t)(v >> 32)) + 32 : _bit_scan_forward((uint32_t)v);
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# endif
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}
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#elif defined(_MSC_VER)
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# define ff_log2 ff_log2_x86
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static av_always_inline av_const int ff_log2_x86(unsigned int v) {
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unsigned long n;
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_BitScanReverse(&n, v | 1);
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return n;
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}
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# define ff_log2_16bit av_log2
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# define ff_ctz ff_ctz_x86
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static av_always_inline av_const int ff_ctz_x86(int v) {
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unsigned long c;
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_BitScanForward(&c, v);
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return c;
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}
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# define ff_ctzll ff_ctzll_x86
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static av_always_inline av_const int ff_ctzll_x86(long long v)
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{
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unsigned long c;
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# if ARCH_X86_64
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_BitScanForward64(&c, v);
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# else
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if ((uint32_t)v == 0) {
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_BitScanForward(&c, (uint32_t)(v >> 32));
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c += 32;
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} else {
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_BitScanForward(&c, (uint32_t)v);
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}
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# endif
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return c;
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}
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#endif /* __INTEL_COMPILER */
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#endif /* HAVE_FAST_CLZ */
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#if defined(__GNUC__)
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/* Our generic version of av_popcount is faster than GCC's built-in on
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* CPUs that don't support the popcnt instruction.
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*/
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#if defined(__POPCNT__)
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#define av_popcount __builtin_popcount
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#if ARCH_X86_64
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#define av_popcount64 __builtin_popcountll
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#endif
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#endif /* __POPCNT__ */
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#if defined(__BMI2__)
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#if AV_GCC_VERSION_AT_LEAST(5,1)
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#define av_mod_uintp2 __builtin_ia32_bzhi_si
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#elif HAVE_INLINE_ASM
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/* GCC releases before 5.1.0 have a broken bzhi builtin, so for those we
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* implement it using inline assembly
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*/
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#define av_mod_uintp2 av_mod_uintp2_bmi2
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static av_always_inline av_const unsigned av_mod_uintp2_bmi2(unsigned a, unsigned p)
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{
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if (av_builtin_constant_p(p))
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return a & ((1 << p) - 1);
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else {
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unsigned x;
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__asm__ ("bzhi %2, %1, %0 \n\t" : "=r"(x) : "rm"(a), "r"(p));
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return x;
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}
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}
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#endif /* AV_GCC_VERSION_AT_LEAST */
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#endif /* __BMI2__ */
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#endif /* __GNUC__ */
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#endif /* AVUTIL_X86_INTMATH_H */
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