[Bug tree-optimization/36098] New: [4.4 Regression] 435.gromacs miscompares at -O3

[Bug tree-optimization/36098] New: [4.4 Regression] 435.gromacs miscompares at -O3

[rguenth at gcc dot gnu dot org]

435.gromacs started to miscompare with -O3 -funroll-loops -fpeel-loops
-ftree-vectorize on the trunk.  Last known good revision was r134722.


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           Summary: [4.4 Regression] 435.gromacs miscompares at -O3
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org
GCC target triplet: x64_86-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36098

[Bug tree-optimization/36098] [4.4 Regression] 435.gromacs miscompares at -O3

[rguenth at gcc dot gnu dot org]

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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36098

[Bug tree-optimization/36098] [4.4 Regression] 435.gromacs miscompares at -O3

[hjl dot tools at gmail dot com]

------- Comment #1 from hjl dot tools at gmail dot com  2008-05-01 23:10 -------
Which revision failed? I can start a regression hunt.


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hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hjl dot tools at gmail dot
                   |                            |com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36098

[Bug tree-optimization/36098] [4.4 Regression] 435.gromacs miscompares at -O3

[hjl dot tools at gmail dot com]

------- Comment #2 from hjl dot tools at gmail dot com  2008-05-02 05:05 -------
Revision 134730:

http://gcc.gnu.org/ml/gcc-cvs/2008-04/msg00959.html

is the cause.


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hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-05-02 05:05:28
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36098

[Bug tree-optimization/36098] [4.4 Regression] 435.gromacs miscompares at -O3

[rguenther at suse dot de]

------- Comment #3 from rguenther at suse dot de  2008-05-02 09:02 -------
Subject: Re:  [4.4 Regression] 435.gromacs
 miscompares at -O3

On Fri, 2 May 2008, hjl dot tools at gmail dot com wrote:

> ------- Comment #2 from hjl dot tools at gmail dot com  2008-05-02 05:05 -------
> Revision 134730:
> 
> http://gcc.gnu.org/ml/gcc-cvs/2008-04/msg00959.html
> 
> is the cause.

That was my guess as well.  An interesting thing would be to know
if the failure goes away with -fno-tree-vectorize.

Richard.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36098

[Bug tree-optimization/36098] [4.4 Regression] 435.gromacs miscompares at -O3

[irar at il dot ibm dot com]

------- Comment #4 from irar at il dot ibm dot com  2008-05-14 07:04 -------
It's a bug in SLP analysis. I am working on a fix.

Ira


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irar at il dot ibm dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |irar at il dot ibm dot com
                   |dot org                     |
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2008-05-02 05:05:28         |2008-05-14 07:04:37
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36098

[Bug tree-optimization/36098] [4.4 Regression] 435.gromacs miscompares at -O3

[irar at gcc dot gnu dot org]

------- Comment #5 from irar at gcc dot gnu dot org  2008-05-14 12:12 -------
Subject: Bug 36098

Author: irar
Date: Wed May 14 12:11:21 2008
New Revision: 135288

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=135288
Log:
        PR tree-optimization/36098
        * tree-vect-analyze.c (vect_analyze_group_access): Set the gap
        value for the first load in the group in case of a gap.
        (vect_build_slp_tree): Check that there are no gaps in loads.


Added:
    branches/gcc-4_3-branch/gcc/testsuite/gcc.dg/vect/O3-pr36098.c
Modified:
    branches/gcc-4_3-branch/gcc/ChangeLog
    branches/gcc-4_3-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_3-branch/gcc/testsuite/gcc.dg/vect/vect.exp
    branches/gcc-4_3-branch/gcc/tree-vect-analyze.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36098

[Bug tree-optimization/36098] [4.4 Regression] 435.gromacs miscompares at -O3

[irar at gcc dot gnu dot org]

------- Comment #6 from irar at gcc dot gnu dot org  2008-05-14 12:29 -------
Subject: Bug 36098

Author: irar
Date: Wed May 14 12:28:53 2008
New Revision: 135290

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=135290
Log:
        PR tree-optimization/36098
        * tree-vect-analyze.c (vect_analyze_group_access): Set the gap
        value for the first load in the group in case of a gap.
        (vect_build_slp_tree): Check that there are no gaps in loads.



Added:
    trunk/gcc/testsuite/gcc.dg/vect/O3-pr36098.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/vect/vect.exp
    trunk/gcc/tree-vect-analyze.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36098

[Bug tree-optimization/36098] [4.4 Regression] 435.gromacs miscompares at -O3

[irar at il dot ibm dot com]

------- Comment #7 from irar at il dot ibm dot com  2008-05-14 12:30 -------
Fixed.


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irar at il dot ibm dot com changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36098