[Bug fortran/36842] Fortran: Minimize heap allocation of temporary arrays by loop versioning in the frontend

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36842

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Fortran: Minimize heap      |Fortran: Minimize heap
                   |allocation of temporary     |allocation of temporary
                   |arrays.                     |arrays by loop versioning
                   |                            |in the frontend

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-09-07 13:54:47 UTC ---
I think the report asks for performing loop versioning in the frontend, thus
emit

  if (Rx and Ry may overlap)
    {
      ... current code ...
    }
  else
    {
      ... code without temporary
    }

where of course the tricky part is creating the appropriate condition
and deciding if it is worthwhile doing the versioning.