Re: [PATCH] Implement the easy part of -fargument-noalias-global

[Richard Guenther <richard dot guenther at gmail dot com>]

On Apr 7, 2005 12:15 AM, Andrew Pinski <pinskia@physics.uc.edu> wrote:
> 
> On Apr 6, 2005, at 5:58 PM, Andrew Pinski wrote:
> 
> > The following patch implements the easiest part of
> > -fargument-noalias-global,
> > which we can represent in the current tree aliasing infrastructure.
> 
> Just a note.  With this patch, we are able to optimize the following
> fortran
> function on the tree level:
> MODULE random_standard_normal_mod
>    implicit none
>    real*8 sum
> contains
>    subroutine sum1 (a, n)
>      real*8 a(n)
>      integer i,n
>      sum = 0
>      do i = 1, n
>        sum = sum + a (i)
>      end do
>    end subroutine
> end MODULE

Nice.  Though only a lazy Fortran77 programmer would produce the above
in Fortran90 :)  I'd expect old Fortran77 programs with lots of common section
use to benefit the most -- variables in common blocks are treated the same
as globals wrt aliasing, no?

Thanks for this,
Richard.