[Bug c++/52492] New: -ftree-vectorize optimization bug

["al at somestuff dot ru" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52492

             Bug #: 52492
           Summary: -ftree-vectorize optimization bug
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: al@somestuff.ru


Created attachment 26834
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26834
the code and memory dump

Hello! It seems we found a bug and have a simple code to reproduce it.
Bug was found under Linux Mint 12 x86_64, gcc 4.6.1.

Please try to compile it as follows: 
correct version:
g++ -O1 test.c++

bug version:
g++ -ggdb -O1 -ftree-vectorize test.c++

Correct version returns the right answer (2543), bug version gets segmentation
fault in the loop of function st_get_local_state_length.

You will need to place file "dump" in the same directory with the program to
reproduce this bug. It contains important memory dump.

Thanks!