libavcodec/x86/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 AVCODEC_X86_MATHOPS_H
  23 #define AVCODEC_X86_MATHOPS_H
  24
  25 #include "config.h"
  26 #include "libavutil/common.h"
  27
  28 #if ARCH_X86_32
  29 #define MULL(ra, rb, shift) \
  30         ({ int rt, dummy; __asm__ (\
  31             "imull %3               \n\t"\
  32             "shrdl %4, %%edx, %%eax \n\t"\
  33             : "=a"(rt), "=d"(dummy)\
  34             : "a" ((int)ra), "rm" ((int)rb), "i"(shift));\
  35          rt; })
  36
  37 #define MULH(ra, rb) \
  38     ({ int rt, dummy;\
  39      __asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)ra), "rm" ((int)rb));\
  40      rt; })
  41
  42 #define MUL64(ra, rb) \
  43     ({ int64_t rt;\
  44      __asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)ra), "g" ((int)rb));\
  45      rt; })
  46 #endif
  47
  48 #if HAVE_CMOV
  49 /* median of 3 */
  50 #define mid_pred mid_pred
  51 static inline av_const int mid_pred(int a, int b, int c)
  52 {
  53     int i=b;
  54     __asm__ volatile(
  55         "cmp    %2, %1 \n\t"
  56         "cmovg  %1, %0 \n\t"
  57         "cmovg  %2, %1 \n\t"
  58         "cmp    %3, %1 \n\t"
  59         "cmovl  %3, %1 \n\t"
  60         "cmp    %1, %0 \n\t"
  61         "cmovg  %1, %0 \n\t"
  62         :"+&r"(i), "+&r"(a)
  63         :"r"(b), "r"(c)
  64     );
  65     return i;
  66 }
  67 #endif
  68
  69 #endif /* AVCODEC_X86_MATHOPS_H */