[Openmp-dev] Offloading API

[Samuel F Antao via Openmp-dev]

Hi Herve,

Sounds like an interesting project the one you are working on!

>From your description I didn't understand well how you are dealing with the
map of pointers. When you say that you have a pointer not generated by
clang, what else is generating it? Can you elaborate on that. I think it
will also help if you post a small example of what you are trying to
accomplish.

I think it will be good to create a pull request in github so we can more
easily comment on the code you have.

Thanks!
Samuel


2015-10-09 11:44 GMT-04:00 Hervé Yviquel <openmp-dev at lists.llvm.org>:

> Hi all,
>
> Some of my colleagues and I are currently developing the infrastructure
> for adding a new device, the cloud, to the list of available targets.
> Considering the cloud as a device requires few changes to the API of the
> offloading library (libomptarget). Indeed, our cloud device handles
> offloading data thanks to files instead of values within an address space.
> To do so, we had to associate each offloaded variables with a unique
> identifier. Those identifiers are assigned by Clang to each variable, then
> transmitted to libomptarget as an additional argument of the offloading
> function "__tgt_target". In case of pointer addresses that are not
> generated by Clang, the special identifier "-1" is attributed. This allows
> us to easily skip the offloading of these addresses that our device doesn't
> use.
>
> You can find attached the patches including the needed modifications both
> for Clang and libomptarget (based on the repositories of
> https://github.com/clang-omp/). If needed, I can make a push request
> directly in github.
>
> Let's us precise that we plan to open source all this work and to submit
> patches to the upstream Clang/OpenMP repositories when it will be mature
> enough. Additionally to simplify future integrations, those API changes can
> be helpful for any exotic offloading target. That's why we propose to
> integrate them directly.
>
> Regards,
> --
> Hervé Yviquel
> Postdoc researcher
> Instituto de Computação (IC) - UNICAMP
> http://people.irisa.fr/Herve.Yviquel/
>
>
>
>
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>
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