Erik Hofman writes:
>
> Yes, I mean 250% increase. But I doubt many others would see such an
> increase because my framerates were already close to freezing point...
Ummm.....
<533> math
$ c++ -O3 -o test test.cxx fastmath.cxx
<534> math
$ ./test
log 3044
fast_log 3164
exp 7150
fast_exp 9764
==== cut -- test.cxx ====
#include "fastmath.hxx"
#include <stdio.h>
#include <time.h>
int main(int argc, char **argv)
{
float a = 1.2;
float b;
int i;
int n=10000000;
int start = clock();
for( i=0; i<n; i++ )
{
b = log(a);
a += 0.00001;
}
printf("log %d\n",clock()-start);
for( i=0; i<n; i++ )
{
b = fast_log(a);
a += 0.00001;
}
printf("fast_log %d\n",clock()-start);
for( i=0; i<n; i++ )
{
b = exp(a);
a += 0.00001;
}
printf("exp %d\n",clock()-start);
for( i=0; i<n; i++ )
{
b = fast_exp(a);
a += 0.00001;
}
printf("fast_exp %d\n",clock()-start);
}
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