Re: Merge current set of OpenACC changes from gomp-4_0-branch

[Julian Brown <julian@codesourcery.com>]

On Tue, 3 Feb 2015 14:28:44 +0300
Ilya Verbin <iverbin@gmail.com> wrote:

> Hi Julian!
> 
> On 27 Jan 14:07, Julian Brown wrote:
> > On Mon, 26 Jan 2015 17:34:26 +0300
> > Ilya Verbin <iverbin@gmail.com> wrote:
> > > Here is my current patch, it works for OpenMP->MIC, but obviously
> > > will not work for PTX, since it requires symmetrical changes in
> > > the plugin.  Could you please take a look, whether it is possible
> > > to support this new interface in PTX plugin?
> > 
> > I think it can probably be made to work. I'll have a look in more
> > detail.
> 
> Do you have any progress on this?

I'm still working on a patch to update OpenACC support and the PTX
backend to use load/unload_image and to unify initialisation/"opening".
So far I think the answer is basically "yes, the new interface can be
supported", though I might request a minor tweak -- e.g. that
load_image takes an extra "void **" argument so that a libgomp backend
can allocate a block of generic metadata relating to the image, then
that same block would be passed (void *) to the unload hook so the
backend can use it there and deallocate it when it's finished with.

Would that be possible? (It'd mostly be for a "CUmodule" handle: this
could be stashed away somewhere within the nvptx backend, but it might
be neater to put it in generic code since it'll probably be useful for
other backends anyway.)

Thanks,

Julian