libavutil/softfloat.c

   1 /*
   2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
   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 #include <inttypes.h>
  22 #include <stdio.h>
  23 #include <assert.h>
  24 #include "softfloat.h"
  25 #include "common.h"
  26 #include "log.h"
  27
  28 #undef printf
  29
  30 int main(void){
  31     SoftFloat one= av_int2sf(1, 0);
  32     SoftFloat sf1, sf2;
  33     double d1, d2;
  34     int i, j;
  35     av_log_set_level(AV_LOG_DEBUG);
  36
  37     d1= 1;
  38     for(i= 0; i<10; i++){
  39         d1= 1/(d1+1);
  40     }
  41     printf("test1 double=%d\n", (int)(d1 * (1<<24)));
  42
  43     sf1= one;
  44     for(i= 0; i<10; i++){
  45         sf1= av_div_sf(one, av_normalize_sf(av_add_sf(one, sf1)));
  46     }
  47     printf("test1 sf    =%d\n", av_sf2int(sf1, 24));
  48
  49
  50     for(i= 0; i<100; i++){
  51         START_TIMER
  52         d1= i;
  53         d2= i/100.0;
  54         for(j= 0; j<1000; j++){
  55             d1= (d1+1)*d2;
  56         }
  57         STOP_TIMER("float add mul")
  58     }
  59     printf("test2 double=%d\n", (int)(d1 * (1<<24)));
  60
  61     for(i= 0; i<100; i++){
  62         START_TIMER
  63         sf1= av_int2sf(i, 0);
  64         sf2= av_div_sf(av_int2sf(i, 2), av_int2sf(200, 3));
  65         for(j= 0; j<1000; j++){
  66             sf1= av_mul_sf(av_add_sf(sf1, one),sf2);
  67         }
  68         STOP_TIMER("softfloat add mul")
  69     }
  70     printf("test2 sf    =%d (%d %d)\n", av_sf2int(sf1, 24), sf1.exp, sf1.mant);
  71     return 0;
  72 }