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

[Diyachkov, Iliya via llvm-dev]

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.

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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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