[Bug fortran/52865] New: GCC can't vectorize fortran loop but able to vectorize similar c-loop

[izamyatin at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52865

             Bug #: 52865
           Summary: GCC can't vectorize fortran loop but able to vectorize
                    similar c-loop
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: izamya...@gmail.com
            Target: x86-64


Created attachment 27087
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27087
Fortran test

That looks strange but the compiler behaves differently on O3 for attached test
cases. 
Fortran can't vectorize loop which looks quite simple

Is it expected behavior?