[llvm-dev] [RFC] SPIR-V backend integration

[Aleksandr Bezzubikov via llvm-dev]

+cc

On Wed, Dec 8, 2021 at 11:50 PM Diyachkov, Iliya via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all,
>
> Intel, Arm and Khronos are proposing to start the integration of SPIR-V
> backend to LLVM.
>
> The general RFC was discussed previously in March 2021 (
> https://lists.llvm.org/pipermail/llvm-dev/2021-March/148905.html). This
> backend has been developed in the Khronos repository by Intel and Arm (
> https://github.com/KhronosGroup/LLVM-SPIRV-Backend). The code has been
> refactored so it does not require extra changes from GlobalISel or other
> LLVM target-independent infrastructure. We have added a pretty extensive
> LIT test suite for the backend functionality.
>
> SPIR-V triple was upstreamed into the LLVM trunk in the middle of November
> (https://reviews.llvm.org/D109144). We have submitted for consideration
> the first patch (https://reviews.llvm.org/D115009) - this is a stub for
> the SPIR-V backend. Please feel free to review it. All comments are welcome.
>
>
> ---------------------------------------------------------------------------------------
> Some additional comments:
>
> As it still has some missing functionality (e.g. exposing some of the
> SPIR-V execution model, image support, complete atomics support, missing
> translation of some of llvm intrinsics), it is now proposed to be
> upstreamed as an experimental backend. Current LIT pass rate is 60% and the
> plan is to have a full conformance before promoting to the production
> backend. We do keep the backend operation compatible with LLVM/SPIR-V
> Translator (https://github.com/KhronosGroup/SPIRV-LLVM-Translator) so the
> future integration of the backend would be as seamless as possible.
>
> SPIR-V specification could be found here:
> https://www.khronos.org/registry/SPIR-V/specs/unified1/SPIRV.html.
>
> Best regards,
> Ilya
>
>
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-- 
Aleksandr Bezzubikov
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