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* [Bug c++/27795] New: optimizer produces faulty code
@ 2006-05-29 16:52 S dot Diederich at gmx dot de
2006-05-29 16:53 ` [Bug c++/27795] " S dot Diederich at gmx dot de
` (8 more replies)
0 siblings, 9 replies; 10+ messages in thread
From: S dot Diederich at gmx dot de @ 2006-05-29 16:52 UTC (permalink / raw)
To: gcc-bugs
The attached (simple) piece of code segfaults if compiled with (>=)-O2.
There are several possibilities to trigger the error.
1. Using the attached cpp, compile with -O2 ends in segfault when running the
app (-O{0,1} is fine)
2. If the cout in the last line is removed, everything seems to be fine
3. If line 16 is exchanged with line 15, everything is fine, too.
(tested on gentoo and SuSE)
Output of "g++ -v -save-temps -O2 compilerbugCPP.cpp -o compilerbug":
Using built-in specs.
Target: i586-suse-linux
Configured with: ../configure --enable-threads=posix --prefix=/usr
--with-local-prefix=/usr/local --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib --libexecdir=/usr/lib
--enable-languages=c,c++,objc,fortran,java,ada --enable-checking=release
--with-gxx-include-dir=/usr/include/c++/4.1.0 --enable-ssp --disable-libssp
--enable-java-awt=gtk --enable-gtk-cairo --disable-libjava-multilib
--with-slibdir=/lib --with-system-zlib --enable-shared --enable-__cxa_atexit
--enable-libstdcxx-allocator=new --without-system-libunwind --with-cpu=generic
--host=i586-suse-linux
Thread model: posix
gcc version 4.1.0 (SUSE Linux)
/usr/lib/gcc/i586-suse-linux/4.1.0/cc1plus -E -quiet -v -D_GNU_SOURCE
compilerbugCPP.cpp -mtune=generic -O2 -fpch-preprocess -o compilerbugCPP.ii
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.1.0
/usr/include/c++/4.1.0/i586-suse-linux
/usr/include/c++/4.1.0/backward
/usr/local/include
/usr/lib/gcc/i586-suse-linux/4.1.0/include
/usr/lib/gcc/i586-suse-linux/4.1.0/../../../../i586-suse-linux/include
/usr/include
End of search list.
/usr/lib/gcc/i586-suse-linux/4.1.0/cc1plus -fpreprocessed compilerbugCPP.ii
-quiet -dumpbase compilerbugCPP.cpp -mtune=generic -auxbase compilerbugCPP -O2
-version -o compilerbugCPP.s
GNU C++ version 4.1.0 (SUSE Linux) (i586-suse-linux)
compiled by GNU C version 4.1.0 (SUSE Linux).
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=129317
Compiler executable checksum: c877835e2478fb620b785c23d7318e1f
/usr/lib/gcc/i586-suse-linux/4.1.0/../../../../i586-suse-linux/bin/as -V -Qy
-o compilerbugCPP.o compilerbugCPP.s
GNU assembler version 2.16.91.0.5 (i586-suse-linux) using BFD version
2.16.91.0.5 20051219 (SUSE Linux)
/usr/lib/gcc/i586-suse-linux/4.1.0/collect2 --eh-frame-hdr -m elf_i386
-dynamic-linker /lib/ld-linux.so.2 -o compilerbug
/usr/lib/gcc/i586-suse-linux/4.1.0/../../../crt1.o
/usr/lib/gcc/i586-suse-linux/4.1.0/../../../crti.o
/usr/lib/gcc/i586-suse-linux/4.1.0/crtbegin.o
-L/usr/lib/gcc/i586-suse-linux/4.1.0 -L/usr/lib/gcc/i586-suse-linux/4.1.0
-L/usr/lib/gcc/i586-suse-linux/4.1.0/../../../../i586-suse-linux/lib
-L/usr/lib/gcc/i586-suse-linux/4.1.0/../../.. compilerbugCPP.o -lstdc++ -lm
-lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/i586-suse-linux/4.1.0/crtend.o
/usr/lib/gcc/i586-suse-linux/4.1.0/../../../crtn.o
--
Summary: optimizer produces faulty code
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: S dot Diederich at gmx dot de
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug c++/27795] optimizer produces faulty code
2006-05-29 16:52 [Bug c++/27795] New: optimizer produces faulty code S dot Diederich at gmx dot de
@ 2006-05-29 16:53 ` S dot Diederich at gmx dot de
2006-05-29 16:54 ` S dot Diederich at gmx dot de
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: S dot Diederich at gmx dot de @ 2006-05-29 16:53 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from S dot Diederich at gmx dot de 2006-05-29 16:53 -------
Created an attachment (id=11530)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=11530&action=view)
cpp to reproduce the error
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug c++/27795] optimizer produces faulty code
2006-05-29 16:52 [Bug c++/27795] New: optimizer produces faulty code S dot Diederich at gmx dot de
2006-05-29 16:53 ` [Bug c++/27795] " S dot Diederich at gmx dot de
@ 2006-05-29 16:54 ` S dot Diederich at gmx dot de
2006-05-29 16:58 ` [Bug tree-optimization/27795] [4.1/4.2 Regression] optimizer produces faulty code [tree-vrp] pinskia at gcc dot gnu dot org
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: S dot Diederich at gmx dot de @ 2006-05-29 16:54 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from S dot Diederich at gmx dot de 2006-05-29 16:54 -------
Created an attachment (id=11531)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=11531&action=view)
corresponding ii
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/27795] [4.1/4.2 Regression] optimizer produces faulty code [tree-vrp]
2006-05-29 16:52 [Bug c++/27795] New: optimizer produces faulty code S dot Diederich at gmx dot de
2006-05-29 16:53 ` [Bug c++/27795] " S dot Diederich at gmx dot de
2006-05-29 16:54 ` S dot Diederich at gmx dot de
@ 2006-05-29 16:58 ` pinskia at gcc dot gnu dot org
2006-05-29 17:05 ` [Bug tree-optimization/27795] [4.1 " pinskia at gcc dot gnu dot org
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-05-29 16:58 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pinskia at gcc dot gnu dot
| |org
Component|c++ |tree-optimization
Keywords| |wrong-code
Summary|optimizer produces faulty |[4.1/4.2 Regression]
|code |optimizer produces faulty
| |code [tree-vrp]
Target Milestone|--- |4.1.2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/27795] [4.1 Regression] optimizer produces faulty code [tree-vrp]
2006-05-29 16:52 [Bug c++/27795] New: optimizer produces faulty code S dot Diederich at gmx dot de
` (2 preceding siblings ...)
2006-05-29 16:58 ` [Bug tree-optimization/27795] [4.1/4.2 Regression] optimizer produces faulty code [tree-vrp] pinskia at gcc dot gnu dot org
@ 2006-05-29 17:05 ` pinskia at gcc dot gnu dot org
2006-05-29 18:03 ` pinskia at gcc dot gnu dot org
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-05-29 17:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from pinskia at gcc dot gnu dot org 2006-05-29 17:05 -------
Fixed at least on the mainline as of today (but was not as of 20060507).
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[4.1/4.2 Regression] |[4.1 Regression] optimizer
|optimizer produces faulty |produces faulty code [tree-
|code [tree-vrp] |vrp]
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/27795] [4.1 Regression] optimizer produces faulty code [tree-vrp]
2006-05-29 16:52 [Bug c++/27795] New: optimizer produces faulty code S dot Diederich at gmx dot de
` (3 preceding siblings ...)
2006-05-29 17:05 ` [Bug tree-optimization/27795] [4.1 " pinskia at gcc dot gnu dot org
@ 2006-05-29 18:03 ` pinskia at gcc dot gnu dot org
2006-05-30 13:46 ` rguenth at gcc dot gnu dot org
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-05-29 18:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from pinskia at gcc dot gnu dot org 2006-05-29 18:03 -------
Still fails on the 4.1 branch.
Confirmed.
--
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 |2006-05-29 18:03:10
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/27795] [4.1 Regression] optimizer produces faulty code [tree-vrp]
2006-05-29 16:52 [Bug c++/27795] New: optimizer produces faulty code S dot Diederich at gmx dot de
` (4 preceding siblings ...)
2006-05-29 18:03 ` pinskia at gcc dot gnu dot org
@ 2006-05-30 13:46 ` rguenth at gcc dot gnu dot org
2006-07-21 12:27 ` rguenth at gcc dot gnu dot org
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2006-05-30 13:46 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from rguenth at gcc dot gnu dot org 2006-05-30 13:45 -------
We transform the loop into an infinite loop. Looks like a sort-of-dup of
PR27639 and/or PR26719.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rakdver at gcc dot gnu dot
| |org
BugsThisDependsOn| |26719, 27639
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/27795] [4.1 Regression] optimizer produces faulty code [tree-vrp]
2006-05-29 16:52 [Bug c++/27795] New: optimizer produces faulty code S dot Diederich at gmx dot de
` (5 preceding siblings ...)
2006-05-30 13:46 ` rguenth at gcc dot gnu dot org
@ 2006-07-21 12:27 ` rguenth at gcc dot gnu dot org
2006-07-24 8:26 ` rguenth at gcc dot gnu dot org
2006-07-24 8:29 ` rguenth at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2006-07-21 12:27 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from rguenth at gcc dot gnu dot org 2006-07-21 12:27 -------
Backporting the fixes fixes this bug.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/27795] [4.1 Regression] optimizer produces faulty code [tree-vrp]
2006-05-29 16:52 [Bug c++/27795] New: optimizer produces faulty code S dot Diederich at gmx dot de
` (6 preceding siblings ...)
2006-07-21 12:27 ` rguenth at gcc dot gnu dot org
@ 2006-07-24 8:26 ` rguenth at gcc dot gnu dot org
2006-07-24 8:29 ` rguenth at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2006-07-24 8:26 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from rguenth at gcc dot gnu dot org 2006-07-24 08:26 -------
Subject: Bug 27795
Author: rguenth
Date: Mon Jul 24 08:25:57 2006
New Revision: 115709
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=115709
Log:
2006-07-21 Richard Guenther <rguenther@suse.de>
PR tree-optimization/27795
PR tree-optimization/27639
PR tree-optimization/26719
Backport from mainline
2006-05-24 Zdenek Dvorak <dvorakz@suse.cz>
* tree-vrp.c (adjust_range_with_scev): Use scev_direction and adjust
call to scev_probably_wraps_p.
* tree-ssa-loop-niter.c (compare_trees, convert_step_widening,
used_in_pointer_arithmetic_p, convert_step): Removed.
(nowrap_type_p): New function.
(scev_probably_wraps_p): Rewritten.
* tree-scalar-evolution.c (instantiate_parameters_1): Do not call
chrec_convert if chrec_convert_aggressive might have been used.
* tree-chrec.c (convert_affine_scev, chrec_convert_1,
scev_direction): New functions.
(chrec_convert): Changed to a wrapper over chrec_convert_1.
* tree-ssa-loop-ivopts.c (idx_find_step): Use convert_affine_scev
instead of convert_step.
* tree-flow.h (scev_probably_wraps_p): Declaration changed.
(convert_step): Declaration removed.
(convert_affine_scev, nowrap_type_p, scev_direction): Declare.
* gcc.dg/pr27639.c: New test.
* gcc.dg/pr26719.c: New test.
* gcc.dg/tree-ssa/scev-cast.c: New test.
Added:
branches/gcc-4_1-branch/gcc/testsuite/gcc.dg/pr26719.c
- copied unchanged from r114057, trunk/gcc/testsuite/gcc.dg/pr26719.c
branches/gcc-4_1-branch/gcc/testsuite/gcc.dg/pr27639.c
- copied unchanged from r114057, trunk/gcc/testsuite/gcc.dg/pr27639.c
branches/gcc-4_1-branch/gcc/testsuite/gcc.dg/tree-ssa/scev-cast.c
- copied unchanged from r114057,
trunk/gcc/testsuite/gcc.dg/tree-ssa/scev-cast.c
Modified:
branches/gcc-4_1-branch/gcc/ChangeLog
branches/gcc-4_1-branch/gcc/testsuite/ChangeLog
branches/gcc-4_1-branch/gcc/tree-chrec.c
branches/gcc-4_1-branch/gcc/tree-flow.h
branches/gcc-4_1-branch/gcc/tree-scalar-evolution.c
branches/gcc-4_1-branch/gcc/tree-ssa-loop-ivopts.c
branches/gcc-4_1-branch/gcc/tree-ssa-loop-niter.c
branches/gcc-4_1-branch/gcc/tree-vrp.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/27795] [4.1 Regression] optimizer produces faulty code [tree-vrp]
2006-05-29 16:52 [Bug c++/27795] New: optimizer produces faulty code S dot Diederich at gmx dot de
` (7 preceding siblings ...)
2006-07-24 8:26 ` rguenth at gcc dot gnu dot org
@ 2006-07-24 8:29 ` rguenth at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2006-07-24 8:29 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from rguenth at gcc dot gnu dot org 2006-07-24 08:28 -------
Fixed.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2006-07-24 8:29 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
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2006-05-29 16:52 [Bug c++/27795] New: optimizer produces faulty code S dot Diederich at gmx dot de
2006-05-29 16:53 ` [Bug c++/27795] " S dot Diederich at gmx dot de
2006-05-29 16:54 ` S dot Diederich at gmx dot de
2006-05-29 16:58 ` [Bug tree-optimization/27795] [4.1/4.2 Regression] optimizer produces faulty code [tree-vrp] pinskia at gcc dot gnu dot org
2006-05-29 17:05 ` [Bug tree-optimization/27795] [4.1 " pinskia at gcc dot gnu dot org
2006-05-29 18:03 ` pinskia at gcc dot gnu dot org
2006-05-30 13:46 ` rguenth at gcc dot gnu dot org
2006-07-21 12:27 ` rguenth at gcc dot gnu dot org
2006-07-24 8:26 ` rguenth at gcc dot gnu dot org
2006-07-24 8:29 ` rguenth at gcc dot gnu dot org
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