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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 
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] = (((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