* [Bug target/13918] [3.3.3 regression] [ia64] bootstrap comparision failure
2004-01-29 6:34 [Bug target/13918] New: [3.3.3 regression] [ia64] bootstrap comparision failure debian-gcc at lists dot debian dot org
@ 2004-01-29 6:41 ` pinskia at gcc dot gnu dot org
2004-01-29 6:49 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2004-01-29 6:41 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-01-29 06:41 -------
Confirmed, I think there is a known bug some where in the optimizers which cause this, it only
effects ia64 because it abuses one of the passes cannot remember which one.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Keywords| |wrong-code
Last reconfirmed|0000-00-00 00:00:00 |2004-01-29 06:41:25
date| |
Target Milestone|--- |3.3.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13918
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2004-01-29 6:34 [Bug target/13918] New: [3.3.3 regression] [ia64] bootstrap comparision failure debian-gcc at lists dot debian dot org
2004-01-29 6:41 ` [Bug target/13918] " pinskia at gcc dot gnu dot org
@ 2004-01-29 6:49 ` pinskia at gcc dot gnu dot org
2004-01-29 6:55 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2004-01-29 6:49 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-01-29 06:49 -------
See http://gcc.gnu.org/ml/gcc/2003-07/msg00585.html. This is caused by IA64 abuse of the
scheduler.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13918
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2004-01-29 6:34 [Bug target/13918] New: [3.3.3 regression] [ia64] bootstrap comparision failure debian-gcc at lists dot debian dot org
2004-01-29 6:41 ` [Bug target/13918] " pinskia at gcc dot gnu dot org
2004-01-29 6:49 ` pinskia at gcc dot gnu dot org
@ 2004-01-29 6:55 ` pinskia at gcc dot gnu dot org
2004-01-29 6:59 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2004-01-29 6:55 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-01-29 06:55 -------
Based a discusion with Zack, this is minor as yyou can still continue from this with just make and
the compiler will still work right as it is just two instructions have been interchanged and in this
case the order does not matter. see <http://gcc.gnu.org/ml/gcc/2003-07/msg00780.html> for
even more info about this bug. (do not trust H. J. Lu on his analysis of the problem).
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|critical |minor
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13918
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2004-01-29 6:55 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2004-01-29 6:59 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-01-29 06:59 -------
Could you try with this patch: <http://gcc.gnu.org/ml/gcc-patches/2004-01/msg02931.html>,
the problem is in cselib which gets abused by ia64.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13918
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2004-01-29 6:59 ` pinskia at gcc dot gnu dot org
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From: wilson at gcc dot gnu dot org @ 2004-01-29 21:41 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From wilson at gcc dot gnu dot org 2004-01-29 21:41 -------
This is a known interaction problem with cselib/sched-ebb. I have never seen a
report of it resulting in an ICE or incorrect code. It only results in code
that is scheduled differently, and hence this can cause the gcc compare test to
fail.
The oversimplified description of the problem is that memory is being accessed
after it has been freed.
This problem is difficult to reproduce. It is known to be sensitive to the
environment size. Small changes to the environment size can cause the problem
to appear or disappear. This is because environment size changes cause pointers
to have different values resulting in different behaviour in the presense of the
bug.
The problem is difficult to fix. Andrew Pinksi suggested a patch, but it is one
patch is a long sequence of patches that have been directed at this problem, and
the problem is still not fully fixed on mainline. I do not recommend taking
this approach for gcc-3.3.
It is safe to ignore the problem if you can. If you can't ignore the problem
then I would suggest changing sched-ebb.c to stop using cselib. This will
result in some performance loss, though I don't know how much. There is a minor
chance of exposing latent bugs with this change, but I think the chance is
acceptably small.
I will put my suggested patch in an attachment. If this patch does not fix the
problem, then there must be something else wrong that needs to be investigated.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13918
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2004-01-29 6:34 [Bug target/13918] New: [3.3.3 regression] [ia64] bootstrap comparision failure debian-gcc at lists dot debian dot org
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2004-01-29 21:41 ` wilson at gcc dot gnu dot org
@ 2004-02-15 12:43 ` gdr at gcc dot gnu dot org
2004-02-22 16:57 ` schwab at suse dot de
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From: gdr at gcc dot gnu dot org @ 2004-02-15 12:43 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From gdr at gcc dot gnu dot org 2004-02-15 12:43 -------
Adjust milestone
--
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|3.3.3 |3.3.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13918
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2004-01-29 6:34 [Bug target/13918] New: [3.3.3 regression] [ia64] bootstrap comparision failure debian-gcc at lists dot debian dot org
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2004-02-15 12:43 ` gdr at gcc dot gnu dot org
@ 2004-02-22 16:57 ` schwab at suse dot de
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From: schwab at suse dot de @ 2004-02-22 16:57 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From schwab at suse dot de 2004-02-22 16:57 -------
FWIW, I'm using this patch in the daily regression test and haven't seen a
comparison failure since then.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13918
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2004-01-29 6:34 [Bug target/13918] New: [3.3.3 regression] [ia64] bootstrap comparision failure debian-gcc at lists dot debian dot org
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2004-02-22 16:57 ` schwab at suse dot de
@ 2004-02-22 17:01 ` gdr at integrable-solutions dot net
2004-02-22 17:56 ` cvs-commit at gcc dot gnu dot org
2004-02-22 17:59 ` schwab at suse dot de
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From: gdr at integrable-solutions dot net @ 2004-02-22 17:01 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From gdr at integrable-solutions dot net 2004-02-22 17:01 -------
Subject: Re: [3.3.3 regression] [ia64] bootstrap comparision failure
"schwab at suse dot de" <gcc-bugzilla@gcc.gnu.org> writes:
| FWIW, I'm using this patch in the daily regression test and haven't seen a
| comparison failure since then.
That is good to know. Would mind going ahead and apply it to
gcc-3_3-branch? Thanks,
-- Gaby
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13918
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2004-01-29 6:34 [Bug target/13918] New: [3.3.3 regression] [ia64] bootstrap comparision failure debian-gcc at lists dot debian dot org
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2004-02-22 17:59 ` schwab at suse dot de
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From: cvs-commit at gcc dot gnu dot org @ 2004-02-22 17:56 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2004-02-22 17:56 -------
Subject: Bug 13918
CVSROOT: /cvs/gcc
Module name: gcc
Branch: gcc-3_3-branch
Changes by: schwab@gcc.gnu.org 2004-02-22 17:56:50
Modified files:
gcc : ChangeLog sched-ebb.c
Log message:
2004-02-22 James E Wilson <wilson@specifixinc.com>
PR target/13918
* sched-ebb.c (ebb_sched_info): Disable use of cselib.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.16114.2.903&r2=1.16114.2.904
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/sched-ebb.c.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.17.20.1&r2=1.17.20.2
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13918
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2004-01-29 6:34 [Bug target/13918] New: [3.3.3 regression] [ia64] bootstrap comparision failure debian-gcc at lists dot debian dot org
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2004-02-22 17:56 ` cvs-commit at gcc dot gnu dot org
@ 2004-02-22 17:59 ` schwab at suse dot de
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From: schwab at suse dot de @ 2004-02-22 17:59 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From schwab at suse dot de 2004-02-22 17:59 -------
Checked in.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13918
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