libavcodec/i386/mathops.h

   1 /*
   2  * simple math operations
   3  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef FFMPEG_I386_MATHOPS_H
  23 #define FFMPEG_I386_MATHOPS_H
  24
  25 #ifdef FRAC_BITS
  26 #   define MULL(ra, rb) \
  27         ({ int rt, dummy; asm (\
  28             "imull %3               \n\t"\
  29             "shrdl %4, %%edx, %%eax \n\t"\
  30             : "=a"(rt), "=d"(dummy)\
  31             : "a" (ra), "rm" (rb), "i"(FRAC_BITS));\
  32          rt; })
  33 #endif
  34
  35 #define MULH(ra, rb) \
  36     ({ int rt, dummy;\
  37      asm ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" (ra), "rm" (rb));\
  38      rt; })
  39
  40 #define MUL64(ra, rb) \
  41     ({ int64_t rt;\
  42      asm ("imull %2\n\t" : "=A"(rt) : "a" (ra), "g" (rb));\
  43      rt; })
  44
  45 #endif /* FFMPEG_I386_MATHOPS_H */