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* [Bug tree-optimization/31996] New: can't determine dependence between p->a[x+i] and *((int *)p + x + i + 8)
@ 2007-05-19 0:41 pinskia at gcc dot gnu dot org
2007-05-19 0:41 ` [Bug tree-optimization/31996] " pinskia at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-05-19 0:41 UTC (permalink / raw)
To: gcc-bugs
Just like PR 31995, this was found on the pointer plus branch after fixing
forwprop (note fowrwprop could be improved even more but that is a different
story and then we just get back to PR 31995 really), This testcase is really
vect-103 but modified to confuse data-ref:
/* { dg-require-effective-target vect_int } */
#include <stdlib.h>
#include <stdarg.h>
#include "tree-vect.h"
#define N 9
struct extraction
{
int a[N];
int b[N];
};
static int a[N] = {1,2,3,4,5,6,7,8,9};
static int b[N] = {17,24,7,0,2,3,4,31,82};
static int c[N] = {9,17,24,7,0,2,3,4,31};
int main1 (int x, int y) {
int i;
struct extraction *p;
p = (struct extraction *) malloc (sizeof (struct extraction));
for (i = 0; i < N; i++)
{
p->a[i] = a[i];
p->b[i] = b[i];
if (x == 135)
abort (); /* to avoid vectorization */
}
/* Vectorizable: distance > VF. */
for (i = 0; i < N; i++)
{
p->a[x + i] = *((int *)p + x + i + 8);
}
/* check results: */
for (i = 0; i < N; i++)
{
if (p->a[i] != c[i])
abort();
}
return 0;
}
int main (void)
{
check_vect ();
return main1 (0, N);
}
/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */
/* { dg-final { scan-tree-dump-times "dependence distance modulo vf == 0" 1
"vect" } } */
/* { dg-final { cleanup-tree-dump "vect" } } */
--
Summary: can't determine dependence between p->a[x+i] and *((int
*)p + x + i + 8)
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31996
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/31996] can't determine dependence between p->a[x+i] and *((int *)p + x + i + 8)
2007-05-19 0:41 [Bug tree-optimization/31996] New: can't determine dependence between p->a[x+i] and *((int *)p + x + i + 8) pinskia at gcc dot gnu dot org
@ 2007-05-19 0:41 ` pinskia at gcc dot gnu dot org
2007-07-09 9:18 ` pinskia at gcc dot gnu dot org
2007-07-18 6:03 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-05-19 0:41 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31996
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/31996] can't determine dependence between p->a[x+i] and *((int *)p + x + i + 8)
2007-05-19 0:41 [Bug tree-optimization/31996] New: can't determine dependence between p->a[x+i] and *((int *)p + x + i + 8) pinskia at gcc dot gnu dot org
2007-05-19 0:41 ` [Bug tree-optimization/31996] " pinskia at gcc dot gnu dot org
@ 2007-07-09 9:18 ` pinskia at gcc dot gnu dot org
2007-07-18 6:03 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-07-09 9:18 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pinskia at gcc dot gnu dot org 2007-07-09 09:18 -------
Confirmed, this is now on the trunk.
http://gcc.gnu.org/ml/gcc-testresults/2007-07/msg00395.html
FAIL: gcc.dg/vect/vect-103.c scan-tree-dump-times vectorized 1 loops 1
FAIL: gcc.dg/vect/vect-103.c scan-tree-dump-times dependence distance modulo vf
== 0 1
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-07-09 09:18:01
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31996
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/31996] can't determine dependence between p->a[x+i] and *((int *)p + x + i + 8)
2007-05-19 0:41 [Bug tree-optimization/31996] New: can't determine dependence between p->a[x+i] and *((int *)p + x + i + 8) pinskia at gcc dot gnu dot org
2007-05-19 0:41 ` [Bug tree-optimization/31996] " pinskia at gcc dot gnu dot org
2007-07-09 9:18 ` pinskia at gcc dot gnu dot org
@ 2007-07-18 6:03 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-07-18 6:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from pinskia at gcc dot gnu dot org 2007-07-18 06:02 -------
The testcase was fixed after:
2007-07-09 Richard Guenther <rguenther@suse.de>
PR middle-end/32698
* fold-const.c (fold_plusminus_mult_expr): Move constant
arguments second to allow decomposing.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31996
^ permalink raw reply [flat|nested] 4+ messages in thread
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2007-05-19 0:41 [Bug tree-optimization/31996] New: can't determine dependence between p->a[x+i] and *((int *)p + x + i + 8) pinskia at gcc dot gnu dot org
2007-05-19 0:41 ` [Bug tree-optimization/31996] " pinskia at gcc dot gnu dot org
2007-07-09 9:18 ` pinskia at gcc dot gnu dot org
2007-07-18 6:03 ` pinskia at gcc dot gnu dot org
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