[hsa merge 07/10] IPA-HSA pass

[Jakub Jelinek]

On Fri, Jan 15, 2016 at 07:38:14PM +0300, Ilya Verbin wrote:
> On Fri, Jan 15, 2016 at 17:09:54 +0100, Jakub Jelinek wrote:
> > On Fri, Jan 15, 2016 at 05:02:34PM +0100, Martin Jambor wrote:
> > > How do other accelerators cope with the situation when half of the
> > > application is compiled with the accelerator disabled?  (Would some of
> > > their calls to GOMP_target_ext lead to abort?)
> > 
> > GOMP_target_ext should never abort (unless internal error), worst case it
> > just falls back into the host fallback.
> 
> Wouldn't that lead to hard-to-find problems in case of nonshared memory?
> I mean when someone expects that all target regions are executed on the device,
> but in fact some of them are silently executed on the host with different data
> environment.

E.g. for HSA it really shouldn't matter, as it is shared memory accelerator.
For XeonPhi we hopefully can offload anything.  NVPTX is problematic,
because it can't offload all the code, but if it can be e.g. compile time
detected that it will not be possible, it can just provide offloaded code
for the target.

	Jakub