mirror of
https://git.ffmpeg.org/ffmpeg.git
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0231097d1b
Since the C11 support is required, those GCC versions can no longer be supported anyhow. (Clang pretends to be GCC 4.4, but it looks like the code was intended for old GCC specifically.)
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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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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/**
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* @file
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* byte swapping routines
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*/
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#ifndef AVUTIL_X86_BSWAP_H
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#define AVUTIL_X86_BSWAP_H
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#include <stdint.h>
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#if defined(_MSC_VER)
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#include <stdlib.h>
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#include <intrin.h>
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#endif
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#include "config.h"
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#include "libavutil/attributes.h"
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#if defined(_MSC_VER)
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#define av_bswap16 av_bswap16
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static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
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{
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return _rotr16(x, 8);
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}
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#define av_bswap32 av_bswap32
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static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
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{
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return _byteswap_ulong(x);
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}
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#if ARCH_X86_64
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#define av_bswap64 av_bswap64
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static inline uint64_t av_const av_bswap64(uint64_t x)
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{
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return _byteswap_uint64(x);
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}
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#endif
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#elif HAVE_INLINE_ASM
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#ifdef __INTEL_COMPILER
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#define av_bswap32 av_bswap32
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static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
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{
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__asm__("bswap %0" : "+r" (x));
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return x;
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}
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#if ARCH_X86_64
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#define av_bswap64 av_bswap64
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static inline uint64_t av_const av_bswap64(uint64_t x)
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{
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__asm__("bswap %0": "=r" (x) : "0" (x));
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return x;
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}
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#endif
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#endif /* __INTEL_COMPILER */
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#endif /* HAVE_INLINE_ASM */
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#endif /* AVUTIL_X86_BSWAP_H */
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