1#include "timing.h"
2#include <stdio.h>
3
4#define INPUT_TYPE int64_t
5#define INPUT_SIZE 256
6#define FUNCTION_NAME __muldi3
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 input1, INPUT_TYPE input2);
17
18int main(int argc, char *argv[]) {
19 INPUT_TYPE input1[INPUT_SIZE];
20 INPUT_TYPE input2[INPUT_SIZE];
21 int i, j;
22
23 srand(seed: 42);
24
25 // Initialize the input array with data of various sizes.
26 for (i=0; i<INPUT_SIZE; ++i) {
27 input1[i] = (((int64_t)rand() << 36) | (uint64_t)rand()) >> (rand() & 63);
28 input2[i] = (((int64_t)rand() << 36) | (uint64_t)rand()) >> (rand() & 63);
29 }
30
31 int64_t fixedInput = INT64_C(0x1234567890ABCDEF);
32
33 double bestTime = __builtin_inf();
34 void *dummyp;
35 for (j=0; j<1024; ++j) {
36
37 uint64_t startTime = mach_absolute_time();
38 for (i=0; i<INPUT_SIZE; ++i)
39 FUNCTION_NAME(input1: input1[i], input2: input2[i]);
40 uint64_t endTime = mach_absolute_time();
41
42 double thisTime = intervalInCycles(startTime, endTime);
43 bestTime = __builtin_fmin(thisTime, bestTime);
44
45 // Move the stack alignment between trials to eliminate (mostly) aliasing effects
46 dummyp = alloca(1);
47 }
48
49 printf(format: "%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);
50
51 return 0;
52}
53

source code of compiler-rt/test/builtins/timing/muldi3.c