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
56
57
58
59
60
61
|
/* { dg-require-effective-target vect_int } */
#include <stdarg.h>
#include "tree-vect.h"
#define N 16
char x[N] __attribute__ ((__aligned__(16)));
int main1 (char *y)
{
struct {
char *p;
char *q;
} s;
char cb[N] __attribute__ ((__aligned__(16))) = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
int i;
/* Not vectorized - can't antialias the pointer s.p from the array cb. */
s.p = y;
for (i = 0; i < N; i++)
{
s.p[i] = cb[i];
}
/* check results: */
for (i = 0; i < N; i++)
{
if (s.p[i] != cb[i])
abort ();
}
/* Not vectorized - can't antialias the pointer s.p from the pointer s.q. */
s.q = cb;
for (i = 0; i < N; i++)
{
s.p[i] = s.q[i];
}
/* check results: */
for (i = 0; i < N; i++)
{
if (s.p[i] != s.q[i])
abort ();
}
return 0;
}
int main (void)
{
check_vect ();
return main1 (x);
}
/* Currently the loops fail to vectorize due to aliasing problems.
If/when the aliasing problems are resolved, unalignment may
prevent vectorization on some targets. */
/* { dg-final { scan-tree-dump-times "vectorized 2 loops" 1 "vect" { xfail *-*-* } } } */
/* { dg-final { scan-tree-dump-times "can't determine dependence between" 2 "vect" } } */
/* { dg-final { cleanup-tree-dump "vect" } } */
|
