[LLVMdev] Supporting heterogeneous computing in llvm.

[Eric Christopher]

On Sat, Jun 6, 2015 at 5:02 AM C Bergström <cbergstrom at pathscale.com> wrote:

> On Sat, Jun 6, 2015 at 6:24 PM, Christos Margiolas
> <chrmargiolas at gmail.com> wrote:
> > Hello,
> >
> > Thank you a lot for the feedback. I believe that the heterogeneous engine
> > should be strongly connected with parallelization and vectorization
> efforts.
> > Most of the accelerators are parallel architectures where having
> efficient
> > parallelization and vectorization can be critical for performance.
> >
> > I am interested in these efforts and I hope that my code can help you
> > managing the offloading operations. Your LLVM instruction set extensions
> may
> > require some changes in the analysis code but I think is going to be
> > straightforward.
> >
> > I am planning to push my code on phabricator in the next days.
>
> If you're doing the extracting at the loop and llvm ir level - why
> would you need to modify the IR? Wouldn't the target level lowering
> happen later?
>
> How are you actually determining to offload? Is this tied to
> directives or using heuristics+some set of restrictions?
>
> Lastly, are you handling 2 targets in the same module or end up
> emitting 2 modules and dealing with recombining things later..
>
>
It's not currently possible to do this using the current structure without
some significant and, honestly, icky patches.

-eric
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