[Bug tree-optimization/45965] New: [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[Bug tree-optimization/45965] New: [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

           Summary: [4.6 Regression] ICE on powerpc-apple-darwin9:
                    gfortran.dg/subref_array_pointer_4.f90
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dominiq@lps.ens.fr
                CC: spop@gcc.gnu.org, irar@il.ibm.com
              Host: powerpc-apple-darwin9
            Target: powerpc-apple-darwin9
             Build: powerpc-apple-darwin9


On powerpc-apple-darwin9, between revisions 164750 and 164814 the following
failures

FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer 
(internal compiler error)
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer  (test
for excess errors)
WARNING: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer 
compilation failed to produce executable
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-loops  (internal compiler error)
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-loops  (test for excess errors)
WARNING: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-loops  compilation failed to produce executable
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions  (internal compiler error)
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions  (test for excess errors)
WARNING: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions  compilation failed to produce executable
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -g  (internal compiler error)
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -g  (test for excess errors)
WARNING: gfortran.dg/subref_array_pointer_4.f90  -O3 -g  compilation failed to
produce executable

appeared (see http://gcc.gnu.org/ml/gcc-testresults/2010-09/msg02570.html and
http://gcc.gnu.org/ml/gcc-testresults/2010-10/msg00006.html ). These ICEs
disappear with -m64 and the minimal options are '-O1 -ftree-vectorize':

[karma] f90/bug% gfc -O1 -ftree-vectorize
/opt/gcc/_gcc_clean/gcc/testsuite/gfortran.dg/subref_array_pointer_4.f90
/opt/gcc/_gcc_clean/gcc/testsuite/gfortran.dg/subref_array_pointer_4.f90: In
function 'main':
/opt/gcc/_gcc_clean/gcc/testsuite/gfortran.dg/subref_array_pointer_4.f90:21:0:
internal compiler error: Bus error

The ICE disappears when using gdb.

I have had a quick look to the commits in the range and most of the significant
ones are related to graphite (I am trying to reduce the range).

[Bug tree-optimization/45965] [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2010-10-11 15:55:29 UTC ---
Reduced range: r164769 no ICE, r164800 ICE.

[Bug tree-optimization/45965] [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2010-10-11 16:40:10 UTC ---
This pr is due to revision 164790

http://gcc.gnu.org/viewcvs?view=revision&sortby=date&revision=164790

Author:    spop
Date:    Thu Sep 30 21:18:48 2010 UTC (10 days, 19 hours ago)
Changed paths:    3
Log Message:    
Also handle ARRAY_REFs in instantiate_scev_r.

2010-08-20  Sebastian Pop  <sebastian.pop@amd.com>

    * tree-scalar-evolution.c (instantiate_array_ref): New.
    (instantiate_scev_r): Also handle ARRAY_REFs.
Changed paths:

Path    Details
trunk/gcc/ChangeLog    modified , text changed
trunk/gcc/ChangeLog.graphite    modified , text changed
trunk/gcc/tree-scalar-evolution.c    modified , text changed

[Bug tree-optimization/45965] [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.6.0

[Bug tree-optimization/45965] [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[spop at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

Sebastian Pop <spop at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2010.11.03 19:22:39
         AssignedTo|unassigned at gcc dot       |spop at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #3 from Sebastian Pop <spop at gcc dot gnu.org> 2010-11-03 19:22:39 UTC ---
Created attachment 22265
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22265
first shot at fixing this

Hi Dominique,

I cannot reproduce this bug on amd64-linux.
Could you please apply the attached patch and see if it fixes the problem?
Otherwise, could you please run gdb on f951 and report a backtrace of where it
fails?

Thanks,
Sebastian

[Bug tree-optimization/45965] [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2010-11-03 19:49:32 UTC ---
> Could you please apply the attached patch and see if it fixes the problem?

Unless I did something wrong (I just used 'make' after the patch), it does
not!-(

> Otherwise, could you please run gdb on f951 and report a backtrace of where it
> fails?

Unfortunately as said in comment #0 the ICE disappears when using gdb.

[Bug tree-optimization/45965] [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |WAITING

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-15 11:33:42 UTC ---
Try valgrind then please.

[Bug tree-optimization/45965] [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

--- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2010-11-15 11:44:41 UTC ---
> Try valgrind then please.

AFAICT there is no valgrind on powerpc-apple-darwin* (if I am wrong, a pointer
is welcome).

[Bug tree-optimization/45965] [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2010-12-20 10:25:46 UTC ---
These failures have disappeared between revisions 168021 and 168044 (see 
http://gcc.gnu.org/ml/gcc-testresults/2010-12/msg01606.html and
http://gcc.gnu.org/ml/gcc-testresults/2010-12/msg01678.html ).

[Bug tree-optimization/45965] [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at redhat dot com

--- Comment #8 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2010-12-20 10:52:14 UTC ---
Since the patch in comment #3 is doing changes in gcc/tree-scalar-evolution.c,
revision 168027 seems to be the best candidate (although I don't know enough to
rule out r168034 or even r168031):

Revision 168027

Jump to revision:         
Author:    jakub
Date:    Sat Dec 18 18:15:10 2010 UTC (40 hours, 30 minutes ago)
Changed paths:    4
Log Message:    
    PR tree-optimization/46985
    * tree-scalar-evolution.c (instantiate_scev_r): If chrec is NULL,
    return it immediately.

    * gfortran.dg/pr46985.f90: New test.
Changed paths:

Path    Details
trunk/gcc/ChangeLog    modified , text changed
trunk/gcc/testsuite/ChangeLog    modified , text changed
trunk/gcc/testsuite/gfortran.dg/pr46985.f90    added
trunk/gcc/tree-scalar-evolution.c    modified , text changed

[Bug tree-optimization/45965] [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
                 CC|                            |jakub at gcc dot gnu.org
         Resolution|                            |FIXED

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-12-20 11:17:00 UTC ---
My patch should make the #c3 patch unnecessary, and perhaps if the problem was
somewhere deeper in the ARRAY_REF argument instead the #c3 patch wouldn't fix
ICE while what has been committed did.  Anyway, as it is fixed now, let's say
it is fixed.