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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. #ifndef AVUTIL_ARM_BSWAP_H
  20. #define AVUTIL_ARM_BSWAP_H
  21.  
  22. #include <stdint.h>
  23. #include "config.h"
  24. #include "libavutil/attributes.h"
  25.  
  26. #ifdef __ARMCC_VERSION
  27.  
  28. #if HAVE_ARMV6
  29. #define av_bswap32 av_bswap32
  30. static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
  31. {
  32.     return __rev(x);
  33. }
  34. #endif /* HAVE_ARMV6 */
  35.  
  36. #elif HAVE_INLINE_ASM
  37.  
  38. #if HAVE_ARMV6_INLINE
  39. #define av_bswap16 av_bswap16
  40. static av_always_inline av_const unsigned av_bswap16(unsigned x)
  41. {
  42.     __asm__("rev16 %0, %0" : "+r"(x));
  43.     return x;
  44. }
  45. #endif
  46.  
  47. #if !AV_GCC_VERSION_AT_LEAST(4,5)
  48. #define av_bswap32 av_bswap32
  49. static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
  50. {
  51. #if HAVE_ARMV6_INLINE
  52.     __asm__("rev %0, %0" : "+r"(x));
  53. #else
  54.     uint32_t t;
  55.     __asm__ ("eor %1, %0, %0, ror #16 \n\t"
  56.              "bic %1, %1, #0xFF0000   \n\t"
  57.              "mov %0, %0, ror #8      \n\t"
  58.              "eor %0, %0, %1, lsr #8  \n\t"
  59.              : "+r"(x), "=&r"(t));
  60. #endif /* HAVE_ARMV6_INLINE */
  61.     return x;
  62. }
  63. #endif /* !AV_GCC_VERSION_AT_LEAST(4,5) */
  64.  
  65. #endif /* __ARMCC_VERSION */
  66.  
  67. #endif /* AVUTIL_ARM_BSWAP_H */
  68.