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87 lines
2.1 KiB
87 lines
2.1 KiB
/* |
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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 <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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#if AV_GCC_VERSION_AT_MOST(4,0) |
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#define av_bswap16 av_bswap16 |
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static av_always_inline av_const unsigned av_bswap16(unsigned x) |
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{ |
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__asm__("rorw $8, %w0" : "+r"(x)); |
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return x; |
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} |
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#endif /* AV_GCC_VERSION_AT_MOST(4,0) */ |
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#if AV_GCC_VERSION_AT_MOST(4,4) || defined(__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 /* AV_GCC_VERSION_AT_MOST(4,4) */ |
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#endif /* HAVE_INLINE_ASM */ |
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#endif /* AVUTIL_X86_BSWAP_H */
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