[Bug fortran/43172] New: Unnecessary array temporary - non-pointer/non-target does not alias

[burnus at gcc dot gnu dot org]

I am not 100% sure whether this is a duplicate of any of the other
missed-optimization PRs; it may well be. Currently, gfortran generates a
temporary for:

subroutine one()
  REAL, ALLOCATABLE  :: kpts(:,:)
  REAL, POINTER      :: syp(:,:)
  kpts = syp
end subroutine one

However, "kpts" cannot alias as it is neither a POINTER nor a TARGET; if there
are components, one needs to be more careful - one also needs to check for
POINTER in the ultra most component. (By the way, dependency.c's
check_data_pointer_types needs to be modified to fix this.)


-- 
           Summary: Unnecessary array temporary - non-pointer/non-target
                    does not alias
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: burnus at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43172