softfloat.c 2.0 KB

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