[Bug tree-optimization/31756] New: Doesn't optimize the following (obvious) sequence

[toon at moene dot indiv dot nluug dot nl]

Given the following Fortran source:

      SUBROUTINE SUB(A, B, N, M)
      DIMENSION A(N, M), B(N, M)
      DO I = 1, N
         DO J = 1, M
            A(I, J) = B(I, J)
         ENDDO
      ENDDO
      END

It should be vectorized using the following compile time options:

-O2 -ftree-vectorize -ftree-vectorizer-verbose=2 -ftree-loop-linear 

Unfortunately, it doesn't.


-- 
           Summary: Doesn't optimize the following (obvious) sequence
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: toon at moene dot indiv dot nluug dot nl
 GCC build triplet: idem
  GCC host triplet: x64_86-unknown-gnu-linux
GCC target triplet: idem


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31756