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FFmpeg/libavutil/softfloat.c

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#include <inttypes.h>
#include <stdio.h>
#include <assert.h>
#include "softfloat.h"
#include "common.h"
#include "log.h"
#undef printf
int main(){
SoftFloat one= av_int2sf(1, 0);
SoftFloat sf1, sf2;
double d1, d2;
int i, j;
av_log_level = AV_LOG_DEBUG;
d1= 1;
for(i= 0; i<10; i++){
d1= 1/(d1+1);
}
printf("test1 double=%d\n", (int)(d1 * (1<<24)));
sf1= one;
for(i= 0; i<10; i++){
sf1= av_div_sf(one, av_normalize_sf(av_add_sf(one, sf1)));
}
printf("test1 sf =%d\n", av_sf2int(sf1, 24));
for(i= 0; i<100; i++){
START_TIMER
d1= i;
d2= i/100.0;
for(j= 0; j<1000; j++){
d1= (d1+1)*d2;
}
STOP_TIMER("float add mul")
}
printf("test2 double=%d\n", (int)(d1 * (1<<24)));
for(i= 0; i<100; i++){
START_TIMER
sf1= av_int2sf(i, 0);
sf2= av_div_sf(av_int2sf(i, 2), av_int2sf(200, 3));
for(j= 0; j<1000; j++){
sf1= av_mul_sf(av_add_sf(sf1, one),sf2);
}
STOP_TIMER("softfloat add mul")
}
printf("test2 sf =%d (%d %d)\n", av_sf2int(sf1, 24), sf1.exp, sf1.mant);
return 0;
}