libavutil/bfin/bswap.h

   1 /*
   2  * Copyright (C) 2007 Marc Hoffman
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file libavutil/bfin/bswap.h
  23  * byte swapping routines
  24  */
  25
  26 #ifndef AVUTIL_BFIN_BSWAP_H
  27 #define AVUTIL_BFIN_BSWAP_H
  28
  29 #include <stdint.h>
  30 #include "config.h"
  31 #include "libavutil/common.h"
  32
  33 #define bswap_32 bswap_32
  34 static av_always_inline av_const uint32_t bswap_32(uint32_t x)
  35 {
  36     unsigned tmp;
  37     __asm__("%1 = %0 >> 8 (V);      \n\t"
  38             "%0 = %0 << 8 (V);      \n\t"
  39             "%0 = %0 | %1;          \n\t"
  40             "%0 = PACK(%0.L, %0.H); \n\t"
  41             : "+d"(x), "=&d"(tmp));
  42     return x;
  43 }
  44
  45 #endif /* AVUTIL_BFIN_BSWAP_H */