Like HIRLAM 6, this is also an aliasing problem: hilaram5.f90:4: note: not vectorized: can't determine dependence between com.b[D.909_22] and (*a_8)[D.909_22] hilaram5.f90:7: note: not vectorized: unhandled data-ref hilaram5.f90:7: note: vectorized 0 loops in function. dorit > L.S., > > This code: > > SUBROUTINE S(N) > DIMENSION A(N), B(12) > COMMON /COM/ B > DO I = 1, 12 > A(I) = B(I) > ENDDO > PRINT*,A(1:12) > END > > when compiled thusly: > > $ gfortran -g -S -O3 -ftree-vectorize -ftree-vectorizer-verbose=2 - > msse2 vect5.f > > draws the dreaded "unhandled data-ref" message: > > vect5.f:4: note: not vectorized: unhandled data-ref > vect5.f:4: note: vectorized 0 loops in function. > > Hmmm, this is rather common (pun intended) in old Fortran code. > Why is this style "punished" by not being vectorizable ;-) ? > > Kind regards, > > -- > Toon Moene - e-mail: [EMAIL PROTECTED] - phone: +31 346 214290 > Saturnushof 14, 3738 XG Maartensdijk, The Netherlands > A maintainer of GNU Fortran 95: http://gcc.gnu.org/fortran/
