1 #include "timing.h" 2 #include <stdio.h> 3 4 #define INPUT_TYPE int 5 #define INPUT_SIZE 512 6 #define FUNCTION_NAME __ashldi3 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 int64_t FUNCTION_NAME(int64_t input, INPUT_TYPE count); 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] = 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 effects 43 dummyp = alloca(1); 44 } 45 46 printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE); 47 48 return 0; 49 } 50
