[Bug debug/46771] New: [4.6 Regression] -fcompare-debug failure (length) with -O -ftree-vectorize

[Bug debug/46771] New: [4.6 Regression] -fcompare-debug failure (length) with -O -ftree-vectorize

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46771

           Summary: [4.6 Regression] -fcompare-debug failure (length) with
                    -O -ftree-vectorize
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
                CC: aoliva@gcc.gnu.org
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 22607
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22607
reduced testcase

Output:
$ gcc -O -ftree-vectorize -fcompare-debug pr46771.c             
gcc: error: pr46771.c: -fcompare-debug failure (length)
$ diff pr46771.*gkd
11c11
...(long output)
There's a difference in generated code with(out) -g.

Tested revisions:
r167383 - fail
r165699 - fail
r161659 - OK
4.5 r166509 - OK

[Bug debug/46771] [4.6 Regression] -fcompare-debug failure (length) with -O -ftree-vectorize

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46771

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.12.02 22:59:29
                 CC|                            |jakub at redhat dot com
   Target Milestone|---                         |4.6.0
     Ever Confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-02 22:59:29 UTC ---
It is caused by revision 165452:

http://gcc.gnu.org/ml/gcc-cvs/2010-10/msg00636.html

[Bug debug/46771] [4.6 Regression] -fcompare-debug failure (length) with -O -ftree-vectorize

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46771

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |jakub at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-12-06 08:05:43 UTC ---
Created attachment 22648
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22648
gcc46-pr46771.patch

Untested fix.

[Bug debug/46771] [4.6 Regression] -fcompare-debug failure (length) with -O -ftree-vectorize

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46771

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-12-06 19:29:41 UTC ---
Author: jakub
Date: Mon Dec  6 19:29:38 2010
New Revision: 167514

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=167514
Log:
    PR debug/46771
    * reginfo.c (init_subregs_of_mode): Don't call find_subregs_of_mode
    on DEBUG_INSNs.

    * gcc.dg/pr46771.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr46771.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/reginfo.c
    trunk/gcc/testsuite/ChangeLog

[Bug debug/46771] [4.6 Regression] -fcompare-debug failure (length) with -O -ftree-vectorize

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46771

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

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

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-12-06 19:39:30 UTC ---
Fixed.