1#include "timing.h"
2#include <stdio.h>
3
4#define INPUT_TYPE int
5#define INPUT_SIZE 512
6#define FUNCTION_NAME __ashldi3
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
16int64_t FUNCTION_NAME(int64_t input, INPUT_TYPE count);
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] = 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(input: fixedInput, count: 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(format: "%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);
47
48 return 0;
49}
50

source code of compiler-rt/test/builtins/timing/ashldi3.c