libavcodec/armv4l/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_ARMV4L_MATHOPS_H
  23 #define FFMPEG_ARMV4L_MATHOPS_H
  24
  25 #ifdef FRAC_BITS
  26 #   define MULL(a, b) \
  27         ({  int lo, hi;\
  28          asm("smull %0, %1, %2, %3     \n\t"\
  29              "mov   %0, %0,     lsr %4\n\t"\
  30              "add   %1, %0, %1, lsl %5\n\t"\
  31              : "=&r"(lo), "=&r"(hi)\
  32              : "r"(b), "r"(a), "i"(FRAC_BITS), "i"(32-FRAC_BITS));\
  33          hi; })
  34 #endif
  35
  36 #define MULH(a, b) \
  37     ({ int lo, hi;\
  38      asm ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a));\
  39      hi; })
  40
  41 #if defined(HAVE_ARMV5TE)
  42
  43 /* signed 16x16 -> 32 multiply add accumulate */
  44 #   define MAC16(rt, ra, rb) \
  45         asm ("smlabb %0, %2, %3, %0" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
  46 /* signed 16x16 -> 32 multiply */
  47 #   define MUL16(ra, rb)                                                \
  48         ({ int __rt;                                                    \
  49          asm ("smulbb %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb));  \
  50          __rt; })
  51
  52 #endif
  53
  54 #endif /* FFMPEG_ARMV4L_MATHOPS_H */