libavcodec/mathops.h

   1 /*
   2  * simple math operations
   3  * Copyright (c) 2001, 2002 Fabrice Bellard.
   4  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22 #ifndef FFMPEG_MATHOPS_H
  23 #define FFMPEG_MATHOPS_H
  24
  25 #include "libavutil/common.h"
  26
  27 #ifdef ARCH_X86_32
  28
  29 #include "i386/mathops.h"
  30
  31 #elif defined(ARCH_ARMV4L)
  32
  33 #include "armv4l/mathops.h"
  34
  35 #elif defined(ARCH_POWERPC)
  36
  37 #include "ppc/mathops.h"
  38
  39 #elif defined(ARCH_BFIN)
  40
  41 #include "bfin/mathops.h"
  42
  43 #endif
  44
  45 /* generic implementation */
  46
  47 #ifndef MULL
  48 #   define MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> FRAC_BITS)
  49 #endif
  50
  51 #ifndef MULH
  52 //gcc 3.4 creates an incredibly bloated mess out of this
  53 //#    define MULH(a,b) (((int64_t)(a) * (int64_t)(b))>>32)
  54
  55 static av_always_inline int MULH(int a, int b){
  56     return ((int64_t)(a) * (int64_t)(b))>>32;
  57 }
  58 #endif
  59
  60 #ifndef MUL64
  61 #   define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
  62 #endif
  63
  64 /* signed 16x16 -> 32 multiply add accumulate */
  65 #ifndef MAC16
  66 #   define MAC16(rt, ra, rb) rt += (ra) * (rb)
  67 #endif
  68
  69 /* signed 16x16 -> 32 multiply */
  70 #ifndef MUL16
  71 #   define MUL16(ra, rb) ((ra) * (rb))
  72 #endif
  73
  74 #endif /* FFMPEG_MATHOPS_H */
  75