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      1 #include "timing.h"
      2 #include <stdio.h>
      3 
      4 #define INPUT_TYPE int64_t
      5 #define INPUT_SIZE 256
      6 #define FUNCTION_NAME __negdi2
      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 input);
     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] = (((int64_t)rand() << 36) | (uint64_t)rand()) >> (rand() & 63);
     27 	}
     28 
     29 	int64_t fixedInput = INT64_C(0x1234567890ABCDEF);
     30 
     31 	double bestTime = __builtin_inf();
     32 	void *dummyp;
     33 	for (j=0; j<1024; ++j) {
     34 
     35 		uint64_t startTime = mach_absolute_time();
     36 		for (i=0; i<INPUT_SIZE; ++i)
     37 			FUNCTION_NAME(input[i]);
     38 		uint64_t endTime = mach_absolute_time();
     39 
     40 		double thisTime = intervalInCycles(startTime, endTime);
     41 		bestTime = __builtin_fmin(thisTime, bestTime);
     42 
     43 		// Move the stack alignment between trials to eliminate (mostly) aliasing effects
     44 		dummyp = alloca(1);
     45 	}
     46 
     47 	printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);
     48 
     49 	return 0;
     50 }
     51