1 #include "timing.h"
2 #include <stdio.h>
3 
4 #define INPUT_TYPE int
5 #define INPUT_SIZE 512
6 #define FUNCTION_NAME __ashrdi3
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 
main(int argc,char * argv[])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