public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
@ 2004-10-12 17:21 sje at cup dot hp dot com
2004-10-12 17:25 ` [Bug tree-optimization/17949] [4.0 Regression] " pinskia at gcc dot gnu dot org
` (12 more replies)
0 siblings, 13 replies; 14+ messages in thread
From: sje at cup dot hp dot com @ 2004-10-12 17:21 UTC (permalink / raw)
To: gcc-bugs
IA64 sets STRICT_ALIGNMENT to 1 but the tree loop optimizer is converting byte
loads into a unaligned word load (and thus creating an unaligned access).
The attached program compiles and runs with no optimization, fails with -O1 and
works with -O1 -fno-tree-loop-optimize. With -O1 running the executable core
dumps on IA64 HP-UX and gives an "Unaligned Access" error message on IA64 Linux.
Test case:
typedef struct
{
short i __attribute__ ((packed));
int f[2] __attribute__ ((packed));
} A;
A a;
int i;
main ()
{
int j;
for (j = 0; j < 2; j++)
i += a.f[j];
}
--
Summary: Tree loop optimization generates unaligned access
(STRICT_ALIGNMENT is set)
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sje at cup dot hp dot com
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: ia64-hp-hpux11.23
GCC host triplet: ia64-hp-hpux11.23
GCC target triplet: ia64-hp-hpux11.23
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
@ 2004-10-12 17:25 ` pinskia at gcc dot gnu dot org
2004-12-05 5:01 ` pinskia at gcc dot gnu dot org
` (11 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-10-12 17:25 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-10-12 17:25 -------
Confirmed, this is caused by IV-OPTS.
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |rakdver at gcc dot gnu dot
| |org
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Keywords| |wrong-code
Last reconfirmed|0000-00-00 00:00:00 |2004-10-12 17:25:25
date| |
Summary|Tree loop optimization |[4.0 Regression] Tree loop
|generates unaligned access |optimization generates
|(STRICT_ALIGNMENT is set) |unaligned access
| |(STRICT_ALIGNMENT is set)
Target Milestone|--- |4.0.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
2004-10-12 17:25 ` [Bug tree-optimization/17949] [4.0 Regression] " pinskia at gcc dot gnu dot org
@ 2004-12-05 5:01 ` pinskia at gcc dot gnu dot org
2004-12-20 11:50 ` steven at gcc dot gnu dot org
` (10 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-05 5:01 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-05 05:01 -------
What we should do create a new type for the same alignment of the struct/array.
--
What |Removed |Added
----------------------------------------------------------------------------
GCC build triplet|ia64-hp-hpux11.23 |
GCC host triplet|ia64-hp-hpux11.23 |
GCC target triplet|ia64-hp-hpux11.23 |ia64-*-*, sparc*-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
2004-10-12 17:25 ` [Bug tree-optimization/17949] [4.0 Regression] " pinskia at gcc dot gnu dot org
2004-12-05 5:01 ` pinskia at gcc dot gnu dot org
@ 2004-12-20 11:50 ` steven at gcc dot gnu dot org
2004-12-20 12:49 ` falk at debian dot org
` (9 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: steven at gcc dot gnu dot org @ 2004-12-20 11:50 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From steven at gcc dot gnu dot org 2004-12-20 11:50 -------
Does this affect *all* STRICT_ALIGNMENT targets? If so, we should
definitely get this one fixed soonish:
alpha/alpha.h:#define STRICT_ALIGNMENT 1
arc/arc.h:#define STRICT_ALIGNMENT 1
arm/arm.h:#define STRICT_ALIGNMENT 1
fr30/fr30.h:#define STRICT_ALIGNMENT 1
frv/frv.h:#define STRICT_ALIGNMENT 1
h8300/h8300.h:#define STRICT_ALIGNMENT 1
i860/i860.h:#define STRICT_ALIGNMENT 1
ia64/ia64.h:#define STRICT_ALIGNMENT 1
iq2000/iq2000.h:#define STRICT_ALIGNMENT 1
m32r/m32r.h:#define STRICT_ALIGNMENT 1
mcore/mcore.h:#define STRICT_ALIGNMENT 1
mips/mips.h:#define STRICT_ALIGNMENT 1
mmix/mmix.h:#define STRICT_ALIGNMENT 1
mn10300/mn10300.h:#define STRICT_ALIGNMENT 1
ns32k/ns32k.h:#define STRICT_ALIGNMENT 1
pa/pa.h:#define STRICT_ALIGNMENT 1
pdp11/pdp11.h:#define STRICT_ALIGNMENT 1
sh/sh.h:#define STRICT_ALIGNMENT 1
sparc/sparc.h:#define STRICT_ALIGNMENT 1
stormy16/stormy16.h:#define STRICT_ALIGNMENT 1
xtensa/xtensa.h:#define STRICT_ALIGNMENT 1
--
What |Removed |Added
----------------------------------------------------------------------------
Priority|P2 |P1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
` (2 preceding siblings ...)
2004-12-20 11:50 ` steven at gcc dot gnu dot org
@ 2004-12-20 12:49 ` falk at debian dot org
2004-12-20 13:35 ` rakdver at atrey dot karlin dot mff dot cuni dot cz
` (8 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: falk at debian dot org @ 2004-12-20 12:49 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From falk at debian dot org 2004-12-20 12:49 -------
(In reply to comment #3)
> Does this affect *all* STRICT_ALIGNMENT targets?
I can at least reproduce it on Alpha.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
` (3 preceding siblings ...)
2004-12-20 12:49 ` falk at debian dot org
@ 2004-12-20 13:35 ` rakdver at atrey dot karlin dot mff dot cuni dot cz
2004-12-20 14:00 ` pinskia at gcc dot gnu dot org
` (7 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: rakdver at atrey dot karlin dot mff dot cuni dot cz @ 2004-12-20 13:35 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From rakdver at atrey dot karlin dot mff dot cuni dot cz 2004-12-20 13:35 -------
Subject: Re: [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
> Does this affect *all* STRICT_ALIGNMENT targets?
Yes, it should.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
` (4 preceding siblings ...)
2004-12-20 13:35 ` rakdver at atrey dot karlin dot mff dot cuni dot cz
@ 2004-12-20 14:00 ` pinskia at gcc dot gnu dot org
2004-12-26 17:16 ` pinskia at gcc dot gnu dot org
` (6 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-20 14:00 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |critical
GCC target triplet|ia64-*-*, sparc*-*-* |ia64-*-*, sparc*-*-*,
| |alpha*-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
` (5 preceding siblings ...)
2004-12-20 14:00 ` pinskia at gcc dot gnu dot org
@ 2004-12-26 17:16 ` pinskia at gcc dot gnu dot org
2004-12-26 17:17 ` pinskia at gcc dot gnu dot org
` (5 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-26 17:16 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-26 17:16 -------
*** Bug 19083 has been marked as a duplicate of this bug. ***
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |danglin at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
` (6 preceding siblings ...)
2004-12-26 17:16 ` pinskia at gcc dot gnu dot org
@ 2004-12-26 17:17 ` pinskia at gcc dot gnu dot org
2004-12-30 22:30 ` rakdver at gcc dot gnu dot org
` (4 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-26 17:17 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-26 17:17 -------
This also effects hppa*-*-*.
--
What |Removed |Added
----------------------------------------------------------------------------
GCC target triplet|ia64-*-*, sparc*-*-*, |ia64-*-*, sparc*-*-*,
|alpha*-*-* |alpha*-*-* hppa*-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
` (7 preceding siblings ...)
2004-12-26 17:17 ` pinskia at gcc dot gnu dot org
@ 2004-12-30 22:30 ` rakdver at gcc dot gnu dot org
2004-12-31 19:15 ` pinskia at gcc dot gnu dot org
` (3 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: rakdver at gcc dot gnu dot org @ 2004-12-30 22:30 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rakdver at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
` (8 preceding siblings ...)
2004-12-30 22:30 ` rakdver at gcc dot gnu dot org
@ 2004-12-31 19:15 ` pinskia at gcc dot gnu dot org
2005-01-01 16:28 ` dave at hiauly1 dot hia dot nrc dot ca
` (2 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-31 19:15 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-31 19:15 -------
Patch here: <http://gcc.gnu.org/ml/gcc-patches/2004-12/msg02156.html>.
--
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
` (9 preceding siblings ...)
2004-12-31 19:15 ` pinskia at gcc dot gnu dot org
@ 2005-01-01 16:28 ` dave at hiauly1 dot hia dot nrc dot ca
2005-01-12 0:06 ` cvs-commit at gcc dot gnu dot org
2005-01-12 0:07 ` rakdver at gcc dot gnu dot org
12 siblings, 0 replies; 14+ messages in thread
From: dave at hiauly1 dot hia dot nrc dot ca @ 2005-01-01 16:28 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From dave at hiauly1 dot hia dot nrc dot ca 2005-01-01 16:28 -------
Subject: Re: [4.0 Regression] Tree loop optimiza
> Patch here: <http://gcc.gnu.org/ml/gcc-patches/2004-12/msg02156.html>.
Fixes the testsuite failure on hppa2.0w-hp-hpux11.11. No regressions
seen.
Thanks,
Dave
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
` (10 preceding siblings ...)
2005-01-01 16:28 ` dave at hiauly1 dot hia dot nrc dot ca
@ 2005-01-12 0:06 ` cvs-commit at gcc dot gnu dot org
2005-01-12 0:07 ` rakdver at gcc dot gnu dot org
12 siblings, 0 replies; 14+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-01-12 0:06 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-01-12 00:06 -------
Subject: Bug 17949
CVSROOT: /cvs/gcc
Module name: gcc
Changes by: rakdver@gcc.gnu.org 2005-01-12 00:05:56
Modified files:
gcc : ChangeLog tree-ssa-loop-ivopts.c
Log message:
PR tree-optimization/17949
* tree-ssa-loop-ivopts.c (may_be_unaligned_p): New function.
(find_interesting_uses_address): Use it.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.7097&r2=2.7098
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-ssa-loop-ivopts.c.diff?cvsroot=gcc&r1=2.39&r2=2.40
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/17949] [4.0 Regression] Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set)
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
` (11 preceding siblings ...)
2005-01-12 0:06 ` cvs-commit at gcc dot gnu dot org
@ 2005-01-12 0:07 ` rakdver at gcc dot gnu dot org
12 siblings, 0 replies; 14+ messages in thread
From: rakdver at gcc dot gnu dot org @ 2005-01-12 0:07 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From rakdver at gcc dot gnu dot org 2005-01-12 00:07 -------
Fixed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17949
^ permalink raw reply [flat|nested] 14+ messages in thread
end of thread, other threads:[~2005-01-12 0:07 UTC | newest]
Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2004-10-12 17:21 [Bug tree-optimization/17949] New: Tree loop optimization generates unaligned access (STRICT_ALIGNMENT is set) sje at cup dot hp dot com
2004-10-12 17:25 ` [Bug tree-optimization/17949] [4.0 Regression] " pinskia at gcc dot gnu dot org
2004-12-05 5:01 ` pinskia at gcc dot gnu dot org
2004-12-20 11:50 ` steven at gcc dot gnu dot org
2004-12-20 12:49 ` falk at debian dot org
2004-12-20 13:35 ` rakdver at atrey dot karlin dot mff dot cuni dot cz
2004-12-20 14:00 ` pinskia at gcc dot gnu dot org
2004-12-26 17:16 ` pinskia at gcc dot gnu dot org
2004-12-26 17:17 ` pinskia at gcc dot gnu dot org
2004-12-30 22:30 ` rakdver at gcc dot gnu dot org
2004-12-31 19:15 ` pinskia at gcc dot gnu dot org
2005-01-01 16:28 ` dave at hiauly1 dot hia dot nrc dot ca
2005-01-12 0:06 ` cvs-commit at gcc dot gnu dot org
2005-01-12 0:07 ` rakdver at gcc dot gnu dot org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).