Viewing file:  no-vfa-vect-depend-1.c (1.1 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* { dg-require-effective-target vect_int } */
#include <stdarg.h>
#include "tree-vect.h"
#define N 17
int ia[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48};
int ib[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48};
int res[N] = {12,24,36,48,60,72,84,96,108,120,132,144,156,168,180,192,48};
__attribute__ ((noinline))
int main1 ()
{
int i;
/* Not vectorizable due to data dependence: dependence distance 1. */
for (i = 0; i < N - 1; i++)
{
ia[i+1] = ia[i] * 4;
}
/* check results: */
for (i = 0; i < N - 1; i++)
{
if (ia[i] != 0)
abort ();
}
/* Vectorizable. Dependence distance -1. */
for (i = 0; i < N - 1; i++)
{
ib[i] = ib[i+1] * 4;
}
/* check results: */
for (i = 0; i < N - 1; i++)
{
if (ib[i] != res[i])
abort ();
}
return 0;
}
int main (void)
{
check_vect();
return main1 ();
}
/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" {xfail { vect_no_align && { ! vect_hw_misalign } } } } } */
/* { dg-final { scan-tree-dump-times "dependence distance negative" 1 "vect" } } */
|
