[Bug tree-optimization/46184] New: [4.6 Regression] ICE: SIGSEGV in vectorizable_reduction (tree-vect-loop.c:4067) with -O -ftree-vectorize -fno-tree-copy-prop -fno-tree-dce

[Bug tree-optimization/46184] New: [4.6 Regression] ICE: SIGSEGV in vectorizable_reduction (tree-vect-loop.c:4067) with -O -ftree-vectorize -fno-tree-copy-prop -fno-tree-dce

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46184

           Summary: [4.6 Regression] ICE: SIGSEGV in
                    vectorizable_reduction (tree-vect-loop.c:4067) with -O
                    -ftree-vectorize -fno-tree-copy-prop -fno-tree-dce
           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 22160
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22160
reduced testcase (from gcc.dg/vect/vect-cond-4.c)

valgrind output:
$ gcc -O -ftree-vectorize -fno-tree-copy-prop -fno-tree-dce pr46184.c
==10721== Invalid read of size 2
==10721==    at 0x9DC5C2: vectorizable_reduction (tree-vect-loop.c:4067)
==10721==    by 0x9D3D1A: vect_analyze_stmt (tree-vect-stmts.c:4661)
==10721==    by 0x9DF616: vect_analyze_loop (tree-vect-loop.c:1248)
==10721==    by 0x9EC288: vectorize_loops (tree-vectorizer.c:219)
==10721==    by 0x797A5E: execute_one_pass (passes.c:1560)
==10721==    by 0x797CF4: execute_pass_list (passes.c:1615)
==10721==    by 0x797D06: execute_pass_list (passes.c:1616)
==10721==    by 0x797D06: execute_pass_list (passes.c:1616)
==10721==    by 0x8E4B65: tree_rest_of_compilation (tree-optimize.c:422)
==10721==    by 0xAAF281: cgraph_expand_function (cgraphunit.c:1494)
==10721==    by 0xAB1849: cgraph_optimize (cgraphunit.c:1553)
==10721==    by 0xAB1DA9: cgraph_finalize_compilation_unit (cgraphunit.c:1016)
==10721==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==10721== 
pr46184.c: In function 'foo':
pr46184.c:4:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r165915 - crash
r159696 - crash
r158095 - OK
4.5 r165781 - OK

[Bug tree-optimization/46184] [4.6 Regression] ICE: SIGSEGV in vectorizable_reduction (tree-vect-loop.c:4067) with -O -ftree-vectorize -fno-tree-copy-prop -fno-tree-dce

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46184

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

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

[Bug tree-optimization/46184] [4.6 Regression] ICE: SIGSEGV in vectorizable_reduction (tree-vect-loop.c:4067) with -O -ftree-vectorize -fno-tree-copy-prop -fno-tree-dce

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46184

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.10.26 16:32:20
                 CC|                            |rguenth at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2010-10-26 16:32:20 UTC ---
It is caused by revision 158157:

http://gcc.gnu.org/ml/gcc-cvs/2010-04/msg00261.html

[Bug tree-optimization/46184] [4.6 Regression] ICE: SIGSEGV in vectorizable_reduction (tree-vect-loop.c:4067) with -O -ftree-vectorize -fno-tree-copy-prop -fno-tree-dce

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46184

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                     |

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-29 12:52:56 UTC ---
Mine.

[Bug tree-optimization/46184] [4.6 Regression] ICE: SIGSEGV in vectorizable_reduction (tree-vect-loop.c:4067) with -O -ftree-vectorize -fno-tree-copy-prop -fno-tree-dce

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46184

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-02 14:24:25 UTC ---
I have a patch.

[Bug tree-optimization/46184] [4.6 Regression] ICE: SIGSEGV in vectorizable_reduction (tree-vect-loop.c:4067) with -O -ftree-vectorize -fno-tree-copy-prop -fno-tree-dce

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46184

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-02 15:46:50 UTC ---
Author: rguenth
Date: Tue Nov  2 15:46:46 2010
New Revision: 166194

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=166194
Log:
2010-11-02  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/46184
    * tree-vect-loop.c (vectorizable_reduction): Try to obtain the
    input vector type from the reduction operand as well.

    * gcc.dg/pr46184.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/pr46184.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-loop.c

[Bug tree-optimization/46184] [4.6 Regression] ICE: SIGSEGV in vectorizable_reduction (tree-vect-loop.c:4067) with -O -ftree-vectorize -fno-tree-copy-prop -fno-tree-dce

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46184

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

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

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-02 15:48:15 UTC ---
Fixed.