[Bug tree-optimization/46149] New: [4.6 Regression] 26_numerics/valarray/27867.cc FAILs with -O2 -fno-tree-sra

[Bug tree-optimization/46149] New: [4.6 Regression] 26_numerics/valarray/27867.cc FAILs with -O2 -fno-tree-sra

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46149

           Summary: [4.6 Regression] 26_numerics/valarray/27867.cc FAILs
                    with -O2 -fno-tree-sra
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 22133
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22133
packed preprocessed source

Output:
$ g++ -O2 -fno-tree-sra 27867.ii -std=c++0x
$ ./a.out 
Segmentation fault

Tested revisions:
r165822 - fail
r163636 - fail
r161659 - fail
r159696 - OK
4.5 r165781 - OK

[Bug tree-optimization/46149] [4.6 Regression] 26_numerics/valarray/27867.cc FAILs with -O2 -fno-tree-sra

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46149

--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> 2010-10-23 14:57:10 UTC ---
Created attachment 22134
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22134
hopefully reduced testcase

OK with -O0:
$ g++ -O0 pr46149.C 
$ ./a.out && echo $?
0
(no valgrind errors)

OK with -O2:
$ g++ -O2 pr46149.C
$ ./a.out && echo $?
0
(no valgrind errors)

crashes with -O2 -fno-tree-sra:
$ g++ -O2 -fno-tree-sra pr46149.C 
$ ./a.out 
Segmentation fault

[Bug tree-optimization/46149] [4.6 Regression] 26_numerics/valarray/27867.cc FAILs with -O2 -fno-tree-sra

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46149

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.10.23 17:19:36
                 CC|                            |rguenth at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2010-10-23 17:19:36 UTC ---
It is caused by revision 161655:

http://gcc.gnu.org/ml/gcc-cvs/2010-07/msg00006.html

[Bug tree-optimization/46149] [4.6 Regression] 26_numerics/valarray/27867.cc FAILs with -O2 -fno-tree-sra

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46149

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |rguenth at gcc dot gnu.org
                   |gnu.org                     |
   Target Milestone|---                         |4.6.0

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-26 14:14:20 UTC ---
Mine.

[Bug tree-optimization/46149] [4.6 Regression] 26_numerics/valarray/27867.cc FAILs with -O2 -fno-tree-sra

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46149

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-02 13:25:12 UTC ---
I have a patch.

[Bug tree-optimization/46149] [4.6 Regression] 26_numerics/valarray/27867.cc FAILs with -O2 -fno-tree-sra

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46149

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-02 17:00:16 UTC ---
Author: rguenth
Date: Tue Nov  2 17:00:09 2010
New Revision: 166204

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=166204
Log:
2010-11-02  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/46149
    * tree-ssa-structalias.c (get_constraint_for_1): Properly handle
    non-indirect MEM_REF variants.

    * g++.dg/torture/pr46149.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr46149.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-structalias.c

[Bug tree-optimization/46149] [4.6 Regression] 26_numerics/valarray/27867.cc FAILs with -O2 -fno-tree-sra

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46149

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-02 17:01:11 UTC ---
Fixed.