diff options
| -rw-r--r-- | testsuite/ctlz.c | 46 |
1 files changed, 19 insertions, 27 deletions
diff --git a/testsuite/ctlz.c b/testsuite/ctlz.c index 6bd91ea..eb7c96b 100644 --- a/testsuite/ctlz.c +++ b/testsuite/ctlz.c @@ -6,44 +6,39 @@ #include "../alpha_mmintrin.h" #define ITERATIONS 10000 +#define ARRAY_ELEMENTS 512 +#define ARRAY_SIZE (ARRAY_ELEMENTS * sizeof(uint64_t)) int main(int argc, char ** argv) { - uint64_t a[512], b[512], c[512]; + uint64_t a[ARRAY_ELEMENTS], b[ARRAY_ELEMENTS], c[ARRAY_ELEMENTS]; uint64_t l1, l2; - uint64_t start, end, overhead; - uint64_t cix_total = 0, noncix_total = 0; + struct timespec cix_start, cix_end; + double cix_t0, cix_t1, cix_total; + struct timespec noncix_start, noncix_end; + double noncix_t0, noncix_t1, noncix_total; int i, j, count = 0; - start = __rpcc(); - end = __rpcc(); - overhead = end - start; - srand(time(NULL)); - for (i = 0; i < 512; i++) { + for (i = 0; i < ARRAY_ELEMENTS; i++) { a[i] = rand(); } + clock_gettime(CLOCK_MONOTONIC, &cix_start); for (j = 0; j < ITERATIONS; j++) { - start = __rpcc(); - - for (i = 0; i < 512; i++) { + for (i = 0; i < ARRAY_ELEMENTS; i++) { l1 = a[i]; l2 = 1 << (64 - __ctlz(l1)); b[i] = l2; } - - end = __rpcc(); - cix_total += end - start - overhead; - memset(b, 0, 4096); } + clock_gettime(CLOCK_MONOTONIC, &cix_end); + clock_gettime(CLOCK_MONOTONIC, &noncix_start); for (j = 0; j < ITERATIONS; j++) { - start = __rpcc(); - - for (i = 0; i < 512; i++) { + for (i = 0; i < ARRAY_ELEMENTS; i++) { l1 = a[i]; while (l1 != 0) { l1 >>= 1; @@ -51,21 +46,18 @@ int main(int argc, char ** argv) { } l2 = 1 << count; c[i] = l2; - // printf("nextpow2 of %lu is %lu\n", i, l2); count = 0; } - - end = __rpcc(); - noncix_total += end - start - overhead; - memset(c, 0, 4096); } + clock_gettime(CLOCK_MONOTONIC, &noncix_end); - noncix_total /= ITERATIONS; - cix_total /= ITERATIONS; + cix_total = (double)((cix_end.tv_sec - cix_start.tv_sec) + ((cix_end.tv_nsec - cix_start.tv_nsec) / 1.0e9)) / ITERATIONS; + noncix_total = (double)((noncix_end.tv_sec - noncix_start.tv_sec) + ((noncix_end.tv_nsec - noncix_start.tv_nsec) / 1.0e9)) / ITERATIONS; - if (memcmp(b, c, 4096) == 0) { + if (memcmp(b, c, ARRAY_SIZE) == 0) { printf("%s:\n", argv[0]); - printf(" CIX time: %9lu nanoseconds\n non-CIX time: %9lu nanoseconds\n", cix_total, noncix_total); + printf(" CIX time: %.9lf seconds\n non-CIX time: %.9lf seconds\n", cix_total, noncix_total); + printf(" Speed-up: %lf\n", noncix_total / cix_total); } else { puts("Final arrays are not equal. Something happened."); } |