[cfe-dev] RFC: Adding support for an OpenCL 3.0 compatible C++ for OpenCL 2021

[Phil Bouchard via cfe-dev]

(Awesome)


On 8/4/21 7:55 AM, Ole Marius Strohm via cfe-dev wrote:
> Hi, all!
>
> As OpenCL C 3.0 is getting support in clang there is a wish to expand 
> C++ for
> OpenCL to be compatible with OpenCL 3.0 as well. Being able to support 
> OpenCL
> 3.0 is important in making C++ for OpenCL a viable option for as many 
> platforms
> as possible.
>
> Arm is therefore proposing adding a new version of C++ for OpenCL 
> which will
> add support for OpenCL 3.0. This version will aim to be backwards 
> compatible
> with OpenCL C 3.0.  This will involve a new language version of C++ 
> for OpenCL,
> currently called C++ for OpenCL 2021 in the draft of the new 
> documentation [1].
>
> ----- Implementation Details -----
>
> As the biggest changes in OpenCL 3.0 are making some 2.0 features 
> optional, and
> a lot of work as already been done in clang to support OpenCL C 3.0 
> [2] there
> shouldn't be a need for any big conceptual changes in clang as a 
> result of this
> work. Our hope is to reuse the work done for OpenCL C 3.0 and apply 
> similar
> logic to C++ mode.
>
> Most of the work is expected to be related to making the 'generic' 
> address space
> optional. Currently this address space is used for several implicitly 
> generated
> constructors and operators, so these will need to be adjusted.
>
> This should still be able to leverage work done for OpenCL C 3.0. For 
> example
> this has already dealt with detecting when the 'generic' address space is
> available. This can then be used to adjust the current C++ for OpenCL
> implementation without requiring large scale changes.
>
> ----------------------------------
>
> As mentioned, the linked documentation is only a draft and will be 
> revised and
> finalized along with the implementation.
>
> If you have any thoughts or comments, please make contact.
>
> Thanks,
> Ole
>
> [1] https://github.com/KhronosGroup/OpenCL-Docs/pull/616 
> <https://github.com/KhronosGroup/OpenCL-Docs/pull/616>
> [2] 
> https://lists.llvm.org/pipermail/cfe-dev/2020-September/066883.html 
> <https://lists.llvm.org/pipermail/cfe-dev/2020-September/066883.html>
>
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