48 lines · c
1#include "timing.h"2#include <stdio.h>3 4#define INPUT_TYPE int64_t5#define INPUT_SIZE 5126#define FUNCTION_NAME __floatdidf7 8#ifndef LIBNAME9#define LIBNAME UNKNOWN10#endif11 12#define LIBSTRING LIBSTRINGX(LIBNAME)13#define LIBSTRINGX(a) LIBSTRINGXX(a)14#define LIBSTRINGXX(a) #a15 16double FUNCTION_NAME(INPUT_TYPE x);17 18int main(int argc, char *argv[]) {19 INPUT_TYPE input[INPUT_SIZE];20 int i, j;21 22 srand(42);23 24 // Initialize the input array with data of various sizes.25 for (i=0; i<INPUT_SIZE; ++i)26 input[i] = (((uint64_t)rand() << 32) | (uint64_t)rand()) >> (rand() & 63);27 28 double bestTime = __builtin_inf();29 void *dummyp;30 for (j=0; j<1024; ++j) {31 32 uint64_t startTime = mach_absolute_time();33 for (i=0; i<INPUT_SIZE; ++i)34 FUNCTION_NAME(input[i]);35 uint64_t endTime = mach_absolute_time();36 37 double thisTime = intervalInCycles(startTime, endTime);38 bestTime = __builtin_fmin(thisTime, bestTime);39 40 // Move the stack alignment between trials to eliminate (mostly) aliasing effects41 dummyp = alloca(1);42 }43 44 printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);45 46 return 0;47}48