gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Details: hash size %u, mask bits %u, perfect %.0f%%\n",
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Details: hash size %u, mask bits %u, perfect %.0f%%\n",