I found this with gfortran (gcc version 4.3.0 20070328), it seems to work with
the gfortran/gcc included in my Mandriva 2007 (gcc version 4.1.1 20060724), so
I've marked it as a regression.


$ cat test.f90

SUBROUTINE Test
IMPLICIT NONE
INTEGER :: i, j
REAL*8 :: C(3,100), rM(100), rMI
COMMON /RInfo/ rMI

DO i = 1, 3
  DO j = 1, 100
    rMI = C(1,j) + C(i,j)
  END DO
END DO

END


$ gfortran -c -O2 -ftree-vectorize test.f90

test.f90: In function ‘test’:
test.f90:1: internal compiler error: in affine_function_equal_p, at
tree-data-ref.c:2072
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.


-- 
           Summary: ICE with -O2 -ftree-vectorize (regression)
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: regression
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jellby at yahoo dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31383