blob: 99a0eca3827ce095fa8667b664bfb1568060e58d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
#ifdef USE_VECTOR
#include <immintrin.h>
#endif
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#define STRIDE (256/32) // How many integers fit in a 256 vector register
#define VSIZE (STRIDE*200000)
int main(int argc, char *argv[]) {
float start, end, duration;
int *v1;
posix_memalign((void**)&v1, 32, VSIZE * sizeof(int));
int *v2;
posix_memalign((void**)&v2, 32, VSIZE * sizeof(int));
int result[VSIZE];
#ifndef USE_VECTOR
printf("Sequential..");
start = (float)clock()/CLOCKS_PER_SEC;
for(int i=0;i<VSIZE;i++){
result[i]=v1[i]+v2[i];
}
end = (float)clock()/CLOCKS_PER_SEC;
duration= end - start;
printf(" done! (duration=%.6fs)\n", duration);
#else
printf("Vectorize...");
__m256i a,b;
// e == extended (for historical reasons just brandy name)
// p == packed (multiple packed elements)
// i == integer
// 32 == each integer is 32bits
__m256i c = _mm256_add_epi32(a, b);
start = (float)clock()/CLOCKS_PER_SEC;
for(int i=0;i<VSIZE;i+=STRIDE){
a = _mm256_load_si256((__m256i*)&v1[i]);
b = _mm256_load_si256((__m256i*)&v2[i]);
c = _mm256_add_epi32(a,b);
_mm256_store_si256((__m256i*)&result[i],c);
}
end = (float)clock()/CLOCKS_PER_SEC;
duration= end - start;
printf(" done! (duration=%.6fs)\n", duration);
#endif
free(v1);
free(v2);
return 0;
}
|
