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
16INPUT_TYPE FUNCTION_NAME(INPUT_TYPE input);
17
18int main(int argc, char *argv[]) {
19 INPUT_TYPE input[INPUT_SIZE];
20 int i, j;
21
22 srand(seed: 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: 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(format: "%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);
48
49 return 0;
50}
51

source code of compiler-rt/test/builtins/timing/negdi2.c