On Fri, Nov 11, 2016 at 11:52:58AM +0300, Alexander Monakov wrote:
> On Fri, 11 Nov 2016, Jakub Jelinek wrote:
> [...]
> > the intended outlining of SIMT regions for PTX offloading done (IMHO the
> > best place to do that is in omp expansion, not gimplification)
>
> Sorry, I couldn't find a good way to implement that during omp expansion. The
> reason I went for gimplification is automatic discovery of sharing clauses -
> I'm assuming in expansion it's very hard to try and fill omp_data_[sio]
> without
> gimplifier's help. Does this sound sensible?
Sure, for discovery of needed sharing clauses the gimplifier has the right
infrastructure. But that doesn't mean you can't add those clauses at
gimplification time and do the outlining at omp expansion time.
That is what is done for omp parallel, task etc. as well. If the standard
OpenMP clauses can't serve that purpose, there is always the possibility of
adding further internal clauses, that would e.g. be only considered for the
SIMT stuff. For the outlining, our current infrastructure really wants to
have CFG etc., something you don't have at gimplification time.
Jakub
