50 lines · c
1#include "timing.h"2#include <stdio.h>3 4#define INPUT_TYPE int5#define INPUT_SIZE 5126#define FUNCTION_NAME __ashrdi37 8#ifndef LIBNAME9#define LIBNAME UNKNOWN10#endif11 12#define LIBSTRING LIBSTRINGX(LIBNAME)13#define LIBSTRINGX(a) LIBSTRINGXX(a)14#define LIBSTRINGXX(a) #a15 16int64_t FUNCTION_NAME(int64_t input, INPUT_TYPE count);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] = rand() & 0x3f;27 28 int64_t fixedInput = INT64_C(0x1234567890ABCDEF);29 30 double bestTime = __builtin_inf();31 void *dummyp;32 for (j=0; j<1024; ++j) {33 34 uint64_t startTime = mach_absolute_time();35 for (i=0; i<INPUT_SIZE; ++i)36 FUNCTION_NAME(fixedInput, input[i]);37 uint64_t endTime = mach_absolute_time();38 39 double thisTime = intervalInCycles(startTime, endTime);40 bestTime = __builtin_fmin(thisTime, bestTime);41 42 // Move the stack alignment between trials to eliminate (mostly) aliasing effects43 dummyp = alloca(1);44 }45 46 printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);47 48 return 0;49}50