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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  4.  * FFmpeg is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Lesser General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2.1 of the License, or (at your option) any later version.
  8.  *
  9.  * FFmpeg is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Lesser General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Lesser General Public
  15.  * License along with FFmpeg; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17.  */
  18.  
  19. /**
  20.  * @file
  21.  * byte swapping routines
  22.  */
  23.  
  24. #ifndef AVUTIL_X86_BSWAP_H
  25. #define AVUTIL_X86_BSWAP_H
  26.  
  27. #include <stdint.h>
  28. #include "config.h"
  29. #include "libavutil/attributes.h"
  30.  
  31. #if HAVE_INLINE_ASM
  32.  
  33. #if !AV_GCC_VERSION_AT_LEAST(4,1)
  34. #define av_bswap16 av_bswap16
  35. static av_always_inline av_const unsigned av_bswap16(unsigned x)
  36. {
  37.     __asm__("rorw $8, %w0" : "+r"(x));
  38.     return x;
  39. }
  40. #endif /* !AV_GCC_VERSION_AT_LEAST(4,1) */
  41.  
  42. #if !AV_GCC_VERSION_AT_LEAST(4,5)
  43. #define av_bswap32 av_bswap32
  44. static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
  45. {
  46.     __asm__("bswap   %0" : "+r" (x));
  47.     return x;
  48. }
  49.  
  50. #if ARCH_X86_64
  51. #define av_bswap64 av_bswap64
  52. static inline uint64_t av_const av_bswap64(uint64_t x)
  53. {
  54.     __asm__("bswap  %0": "=r" (x) : "0" (x));
  55.     return x;
  56. }
  57. #endif
  58. #endif /* !AV_GCC_VERSION_AT_LEAST(4,5) */
  59.  
  60. #endif /* HAVE_INLINE_ASM */
  61. #endif /* AVUTIL_X86_BSWAP_H */
  62.