[Bug fortran/44646] [F2008] Implement DO CONCURRENT

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44646

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-09-05 07:42:29 UTC ---
Parser patch: http://gcc.gnu.org/ml/fortran/2011-09/msg00002.html

TODO as follow up:

* Replace "Sorry" by a real implementation in trans-stmt.c
  Note: Needs support for MASK= as allowed by the for-all header,
  reusing trans_forall will not work - and will generate slow code.

* Implement type-spec support for "forall" and "do concurrent":
  "(integer(8) :: i = 1:5:2)"

* Add documentation to gfc-internal.texi, update gfortran.texi (F2003 status)
  and the wiki

* Try to make use of the constraints for the middle end (optimization,
  autoparallelization), if possible.
  As Cilk+ does something like that, one can piggyback on their effort, either
  after Cilk+ is merged or by forward porting the change from the Cilk+ branch
  to the trunk.
  Cf. http://gcc.gnu.org/ml/gcc/2011-09/msg00021.html
  and http://gcc.gnu.org/ml/gcc/2011-08/msg00279.html

* Optionally (-fdo-concurrent=...?), parallelize the loop (e.g. by adding
  OpenMP pragmas).