/* Steps in program: determine the number of iterations of desired
* function required to get a measurement interval of the desired
* length, allocate vectors of that size, initialize to appropriate
* values for both the related and random scenarios, make the runs,
* output the results. */
main()
{
int i,itercount;
unsigned ccount;
/* The next two lines are just a sanity check -- particularly
useful when trying on a new platform. Can comment out when
doing repeated runs thereafter. */
/* display_CPUspeed();
printf("Cycle threshold for measurements: %.2f (millions)\n\n",
(double) CMIN / 1e6); */
itercount = measurecnt();
printf("Measuring using %d iterations\n",itercount);
/* allocate arrays for both scenarios */
allocarrays(itercount);
/* initialize arrays for scenario 1: valA[i] < valB[i] */
initarrays1(itercount);
/* do multiple runs for this scenario, recording each */
clearlist();
for (i = 0; i < MEASMAX; i++)
{
ccount = measure(itercount);
addtolist(ccount);
}
/* test and output best */
printf("Cycles per function call, predictable branches\n");
testbest();
/* initialize arrays for scenario 2: valA[i] ? valB[i] */
initarrays2(itercount);
/* do multiple runs for this scenario, recording each */
clearlist();
for (i = 0; i < MEASMAX; i++)
{
ccount = measure(itercount);
addtolist(ccount);
}
/* test and output best */
printf("Cycles per function call, unpredictable branches\n");
testbest();
}
/* driver for everything: for current vector and operation types,
* run through entire range of vector lengths, making repeated
* measurements of each, then determine slope of line that best
* matches data, and finally output results as CPE. */
main()
{
int i,j;
unsigned ccount;
/* The next two lines are just a sanity check -- particularly
useful when trying on a new platform. Can comment out when
doing repeated runs thereafter. */
/* display_CPUspeed();
printf("Cycle threshold for measurements: %.2f (millions)\n\n",
(double) CMIN / 1e6); */
clearmaster();
initvlen();
for (i = 2; i <= VECMAX; i = i << 1)
{
/* printf("Vector length: %d\n",i); for debugging */
setupvectors(i);
clearlist();
/* do multiple runs for this vector length, recording each */
for (j = 0; j < MEASMAX; j++)
{
ccount = measure();
addtolist(ccount);
}
testbest();
addtomaster(); /* record best time in master list */
}
/* dumpmaster(); for debugging */
lsfit(); /* do linear fit */
}
