* [Bug rtl-optimization/21144] [4.0/4.1 regression] Apparent infinite loop in reload
2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
@ 2005-04-21 9:42 ` schwab at suse dot de
2005-04-21 12:52 ` pinskia at gcc dot gnu dot org
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From: schwab at suse dot de @ 2005-04-21 9:42 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From schwab at suse dot de 2005-04-21 09:42 -------
Created an attachment (id=8698)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8698&action=view)
Testcase
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
2005-04-21 9:42 ` [Bug rtl-optimization/21144] " schwab at suse dot de
@ 2005-04-21 12:52 ` pinskia at gcc dot gnu dot org
2005-04-25 13:20 ` matz at suse dot de
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From: pinskia at gcc dot gnu dot org @ 2005-04-21 12:52 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.0.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
2005-04-21 9:42 ` [Bug rtl-optimization/21144] " schwab at suse dot de
2005-04-21 12:52 ` pinskia at gcc dot gnu dot org
@ 2005-04-25 13:20 ` matz at suse dot de
2005-04-25 13:26 ` pinskia at gcc dot gnu dot org
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From: matz at suse dot de @ 2005-04-25 13:20 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From matz at suse dot de 2005-04-25 13:20 -------
The problem is in reload_cse_move2add. It has such a loop:
for (narrow_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
narrow_mode != GET_MODE (reg);
narrow_mode = GET_MODE_WIDER_MODE (narrow_mode))
{
where 'reg' comes from a simple SET insn. In this testcase the insn is:
(set (reg:BI r15) (const_int 1))
note the mode of reg being BImode. Now, BImode is in fact a
FRACTIONAL_INT_MODE, not an INT_MODE (although GET_MODE_CLASS would
return INT_MODE, so using this instead of hard-coded INT_MODE wouldn't help).
And GET_CLASS_NARROWEST_MODE(INT_MODE) is QImode, as it will ignore modes
with precision 1 bit in genmodes.c (I think because the rest of the compiler
is not prepared to really see an BImode here, but I may be wrong, there
are not that many instance of GET_CLASS_NARROWEST_MODE and most look safe,
but will iterate one more time uselessly if started from BImode).
So, this loop starts with QImode, widens the mode each time, and waits for
it to become equal to the mode of 'reg', i.e. BImode. This of course
never happens, so somewhen it is VOIDmode, and that's the fixed point
of GET_CLASS_NARROWEST_MODE. So we are endlessly looping.
I've attached the obvious change, which I'm going to regtest now. It fixes
this testcase.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
` (2 preceding siblings ...)
2005-04-25 13:20 ` matz at suse dot de
@ 2005-04-25 13:26 ` pinskia at gcc dot gnu dot org
2005-04-25 13:29 ` matz at suse dot de
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From: pinskia at gcc dot gnu dot org @ 2005-04-25 13:26 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |pinskia at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
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2005-04-25 13:26 ` pinskia at gcc dot gnu dot org
@ 2005-04-25 13:29 ` matz at suse dot de
2005-04-28 1:15 ` wilson at gcc dot gnu dot org
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From: matz at suse dot de @ 2005-04-25 13:29 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From matz at suse dot de 2005-04-25 13:26 -------
Created an attachment (id=8734)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8734&action=view)
Patch for above problem
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
` (4 preceding siblings ...)
2005-04-25 13:29 ` matz at suse dot de
@ 2005-04-28 1:15 ` wilson at gcc dot gnu dot org
2005-04-29 18:39 ` cvs-commit at gcc dot gnu dot org
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From: wilson at gcc dot gnu dot org @ 2005-04-28 1:15 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From wilson at gcc dot gnu dot org 2005-04-28 01:15 -------
Confirmed.
The patch is OK for both mainline and the gcc-4.0 branch, assuming it passes the
regtest, in case anyone was waiting for approval.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2005-04-28 01:15:34
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
` (5 preceding siblings ...)
2005-04-28 1:15 ` wilson at gcc dot gnu dot org
@ 2005-04-29 18:39 ` cvs-commit at gcc dot gnu dot org
2005-04-29 18:39 ` cvs-commit at gcc dot gnu dot org
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From: cvs-commit at gcc dot gnu dot org @ 2005-04-29 18:39 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-04-29 18:38 -------
Subject: Bug 21144
CVSROOT: /cvs/gcc
Module name: gcc
Branch: gcc-4_0-branch
Changes by: matz@gcc.gnu.org 2005-04-29 18:38:44
Modified files:
gcc : ChangeLog postreload.c
Log message:
PR rtl-optimization/21144
* postreload.c (reload_cse_move2add): Check for VOIDmode.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=2.7592.2.204&r2=2.7592.2.205
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/postreload.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=2.27&r2=2.27.8.1
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
` (6 preceding siblings ...)
2005-04-29 18:39 ` cvs-commit at gcc dot gnu dot org
@ 2005-04-29 18:39 ` cvs-commit at gcc dot gnu dot org
2005-04-29 19:03 ` matz at suse dot de
` (2 subsequent siblings)
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From: cvs-commit at gcc dot gnu dot org @ 2005-04-29 18:39 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-04-29 18:39 -------
Subject: Bug 21144
CVSROOT: /cvs/gcc
Module name: gcc
Changes by: matz@gcc.gnu.org 2005-04-29 18:39:23
Modified files:
gcc : ChangeLog postreload.c
Log message:
PR rtl-optimization/21144
* postreload.c (reload_cse_move2add): Check for VOIDmode.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.8532&r2=2.8533
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/postreload.c.diff?cvsroot=gcc&r1=2.29&r2=2.30
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
` (7 preceding siblings ...)
2005-04-29 18:39 ` cvs-commit at gcc dot gnu dot org
@ 2005-04-29 19:03 ` matz at suse dot de
2005-04-29 19:08 ` pinskia at gcc dot gnu dot org
2005-06-25 9:56 ` cvs-commit at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: matz at suse dot de @ 2005-04-29 19:03 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From matz at suse dot de 2005-04-29 19:03 -------
This is now fixed, but it seems, even though I'm logged in, I can't change the state
of this report.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
` (8 preceding siblings ...)
2005-04-29 19:03 ` matz at suse dot de
@ 2005-04-29 19:08 ` pinskia at gcc dot gnu dot org
2005-06-25 9:56 ` cvs-commit at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-04-29 19:08 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-04-29 19:08 -------
Fixed.
(In reply to comment #7)
> This is now fixed, but it seems, even though I'm logged in, I can't change the state
> of this report.
I will get you admin. access.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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2005-04-21 9:41 [Bug rtl-optimization/21144] New: [4.0/4.1 regression] Apparent infinite loop in reload schwab at suse dot de
` (9 preceding siblings ...)
2005-04-29 19:08 ` pinskia at gcc dot gnu dot org
@ 2005-06-25 9:56 ` cvs-commit at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-06-25 9:56 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-06-25 09:56 -------
Subject: Bug 21144
CVSROOT: /cvs/gcc
Module name: gcc
Changes by: tkoenig@gcc.gnu.org 2005-06-25 09:56:38
Modified files:
libgfortran : ChangeLog
libgfortran/m4 : cshift1.m4 eoshift1.m4 eoshift3.m4
libgfortran/generated: cshift1_4.c cshift1_8.c eoshift1_4.c
eoshift1_8.c eoshift3_4.c eoshift3_8.c
gcc/testsuite : ChangeLog
Added files:
gcc/testsuite/gfortran.dg: shift-alloc.f90
Log message:
2005-06-25 Thomas Koenig <Thomas.Koenig@online.de>
PR libfortran/22144
* m4/cshift1.m4: Remove const from argument ret.
Populate return array descriptor if ret->data is NULL.
* m4/eoshift1.m4: Likewise.
* m4/eoshift3.m4: Likewise.
* generated/cshift1_4.c: Regenerated.
* generated/cshift1_8.c: Regenerated.
* generated/eoshift1_4.c: Regenerated.
* generated/eoshift1_8.c: Regenerated.
* generated/eoshift3_4.c: Regenerated.
* generated/eoshift3_8.c: Regenerated.
2005-06-25 Thomas Koenig <Thomas.Koenig@online.de>
PR libfortran/21144
* gfortran.dg/shift-alloc.f90: New testcase.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libgfortran/ChangeLog.diff?cvsroot=gcc&r1=1.249&r2=1.250
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libgfortran/m4/cshift1.m4.diff?cvsroot=gcc&r1=1.7&r2=1.8
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libgfortran/m4/eoshift1.m4.diff?cvsroot=gcc&r1=1.8&r2=1.9
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libgfortran/m4/eoshift3.m4.diff?cvsroot=gcc&r1=1.8&r2=1.9
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libgfortran/generated/cshift1_4.c.diff?cvsroot=gcc&r1=1.6&r2=1.7
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libgfortran/generated/cshift1_8.c.diff?cvsroot=gcc&r1=1.6&r2=1.7
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libgfortran/generated/eoshift1_4.c.diff?cvsroot=gcc&r1=1.7&r2=1.8
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libgfortran/generated/eoshift1_8.c.diff?cvsroot=gcc&r1=1.7&r2=1.8
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libgfortran/generated/eoshift3_4.c.diff?cvsroot=gcc&r1=1.7&r2=1.8
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libgfortran/generated/eoshift3_8.c.diff?cvsroot=gcc&r1=1.7&r2=1.8
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.5684&r2=1.5685
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gfortran.dg/shift-alloc.f90.diff?cvsroot=gcc&r1=NONE&r2=1.1
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21144
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