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