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* [Bug tree-optimization/18813] New: not vectorizing obvious loop
@ 2004-12-03 18:14 pinskia at gcc dot gnu dot org
2004-12-03 19:51 ` [Bug tree-optimization/18813] " pinskia at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-03 18:14 UTC (permalink / raw)
To: gcc-bugs
We cannot vectorize the following loop because the "number of iterations cannot be computed".
int f(int *s, int *e)
{
while ( s < e ) *s++ = 0;
}
This acutally shows up in SPEC (gap).
--
Summary: not vectorizing obvious loop
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18813
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/18813] not vectorizing obvious loop
2004-12-03 18:14 [Bug tree-optimization/18813] New: not vectorizing obvious loop pinskia at gcc dot gnu dot org
@ 2004-12-03 19:51 ` pinskia at gcc dot gnu dot org
2004-12-06 4:58 ` pinskia at gcc dot gnu dot org
2004-12-21 5:44 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-03 19:51 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-03 19:51 -------
Oh, the problem is we don't handle non one increment.
Another example:
int f(unsigned s1, unsigned s2, int *s, int *e)
{
unsigned i;
for (i = s1; i< s2; i+=4)
*s++ = 0;
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18813
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/18813] not vectorizing obvious loop
2004-12-03 18:14 [Bug tree-optimization/18813] New: not vectorizing obvious loop pinskia at gcc dot gnu dot org
2004-12-03 19:51 ` [Bug tree-optimization/18813] " pinskia at gcc dot gnu dot org
@ 2004-12-06 4:58 ` pinskia at gcc dot gnu dot org
2004-12-21 5:44 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-06 4:58 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-06 04:58 -------
Confirmed.
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |rakdver at gcc dot gnu dot
| |org
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2004-12-06 04:58:12
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18813
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/18813] not vectorizing obvious loop
2004-12-03 18:14 [Bug tree-optimization/18813] New: not vectorizing obvious loop pinskia at gcc dot gnu dot org
2004-12-03 19:51 ` [Bug tree-optimization/18813] " pinskia at gcc dot gnu dot org
2004-12-06 4:58 ` pinskia at gcc dot gnu dot org
@ 2004-12-21 5:44 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-21 5:44 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-21 05:44 -------
Note we are unrolling this loop now so that should help SPEC.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18813
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/18813] not vectorizing obvious loop
[not found] <bug-18813-6528@http.gcc.gnu.org/bugzilla/>
@ 2006-01-29 5:23 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-01-29 5:23 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from pinskia at gcc dot gnu dot org 2006-01-29 05:23 -------
The first example is fixed so closing as fixed, the second example I think has
been fixed seperately already.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.2.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18813
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2006-01-29 5:23 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2004-12-03 18:14 [Bug tree-optimization/18813] New: not vectorizing obvious loop pinskia at gcc dot gnu dot org
2004-12-03 19:51 ` [Bug tree-optimization/18813] " pinskia at gcc dot gnu dot org
2004-12-06 4:58 ` pinskia at gcc dot gnu dot org
2004-12-21 5:44 ` pinskia at gcc dot gnu dot org
[not found] <bug-18813-6528@http.gcc.gnu.org/bugzilla/>
2006-01-29 5:23 ` pinskia at gcc dot gnu dot org
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