1 #include "timing.h" 2 #include <stdio.h> 3 4 #define INPUT_TYPE uint64_t 5 #define INPUT_SIZE 512 6 #define FUNCTION_NAME __floatundisf 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 float FUNCTION_NAME(INPUT_TYPE x); 17 18 int 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 effects 41 dummyp = alloca(1); 42 } 43 44 printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE); 45 46 return 0; 47 } 48
