1 #include "timing.h" 2 #include <stdio.h> 3 4 #define INPUT_TYPE int64_t 5 #define INPUT_SIZE 256 6 #define FUNCTION_NAME __divdi3 7 8 #ifndef LIBNAME 9 #define LIBNAME UNKNOWN 10 #endif 11 12 #define LIBSTRING LIBSTRINGX(LIBNAME) 13 #define LIBSTRINGX(a) LIBSTRINGXX(a) 14 #define LIBSTRINGXX(a) #a 15 16 INPUT_TYPE FUNCTION_NAME(INPUT_TYPE input1, INPUT_TYPE input2); 17 18 int main(int argc, char *argv[]) { 19 INPUT_TYPE input1[INPUT_SIZE]; 20 INPUT_TYPE input2[INPUT_SIZE]; 21 int i, j; 22 23 srand(42); 24 25 // Initialize the input array with data of various sizes. 26 for (i=0; i<INPUT_SIZE; ++i) { 27 input1[i] = (((int64_t)rand() << 36) | (uint64_t)rand()) >> (rand() & 63); 28 input2[i] = ((((int64_t)rand() << 36) | (uint64_t)rand()) >> (rand() & 63)) + 1LL; 29 } 30 31 int64_t fixedInput = INT64_C(0x1234567890ABCDEF); 32 33 double bestTime = __builtin_inf(); 34 void *dummyp; 35 for (j=0; j<1024; ++j) { 36 37 uint64_t startTime = mach_absolute_time(); 38 for (i=0; i<INPUT_SIZE; ++i) 39 FUNCTION_NAME(input1[i], input2[i]); 40 uint64_t endTime = mach_absolute_time(); 41 42 double thisTime = intervalInCycles(startTime, endTime); 43 bestTime = __builtin_fmin(thisTime, bestTime); 44 45 // Move the stack alignment between trials to eliminate (mostly) aliasing effects 46 dummyp = alloca(1); 47 } 48 49 printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE); 50 51 return 0; 52 } 53
