LibCycle 1.2 發布，估算每個函數消耗的CPU周期數

LibCycle是一個庫，可以幫助估計每個函數消耗的CPU周期數。

int randn ()
{


CYCLE_COUNTER_TIC();

int i = 0;
float x, y;

int r = 0;
for (i = 0; i < 10; i++) {

    CYCLE_COUNTER_TIC(intern_while);

    do {
        x = (float) rand () / ((float)RAND_MAX + 1);
    } while (x == 0);

    CYCLE_COUNTER_TOC(intern_while);

    y = (float) rand () / ((float)RAND_MAX + 1);
    float z = sqrtf (-2. * logf (x)) * cosf (2 * M_PI * y);
    r = z * (1 << 31);
}

CYCLE_COUNTER_TOC();

return r;

}
int main (int argc, char *argv[])
{
    int i;

printf ("random:");

double sum_rd = 0;
for (i = 0; i < N; i++) {
    sum_rd += randn ();
}

printf (" done\n");

display_cycle_counters ();

return 0;

}</pre>

 

發布說明: This release is the first public version. There's also some adaptation for the x64 architecture, and an internal implementation of sqrt to remove a dependency on the math library.
                    

                        
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