1#include "timing.h"
2#include <stdio.h>
3
4#ifndef LIBNAME
5#define LIBNAME UNKNOWN
6#endif
7
8#define LIBSTRING		LIBSTRINGX(LIBNAME)
9#define LIBSTRINGX(a)	LIBSTRINGXX(a)
10#define LIBSTRINGXX(a)	#a
11
12double __floatundidf(uint64_t x);
13
14int main(int argc, char *argv[]) {
15#define INPUT_SIZE 512
16	uint64_t input[INPUT_SIZE];
17	int i, j;
18
19	srand(42);
20
21	// Initialize the input array with data of various sizes.
22	for (i=0; i<INPUT_SIZE; ++i)
23		input[i] = (((uint64_t)rand() << 32) | (uint64_t)rand()) >> (rand() & 63);
24
25	double bestTime = __builtin_inf();
26	void *dummyp;
27	for (j=0; j<1024; ++j) {
28
29		uint64_t startTime = mach_absolute_time();
30		for (i=0; i<INPUT_SIZE; ++i)
31			__floatundidf(input[i]);
32		uint64_t endTime = mach_absolute_time();
33
34		double thisTime = intervalInCycles(startTime, endTime);
35		bestTime = __builtin_fmin(thisTime, bestTime);
36
37		// Move the stack alignment between trials to eliminate (mostly) aliasing effects
38		dummyp = alloca(1);
39	}
40
41	printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);
42
43	return 0;
44}
45