Welcome to LLVM GPU News, a bi-weekly newsletter on all the GPU things under the LLVM umbrella. This issue covers the period from August 6 to August 19, 2022.

We welcome your feedback and suggestions. Let us know if we missed anything interesting, or want us to bring attention to your (sub)project, revisions under review, or proposals. Please see the bottom of the page for details on how to submit suggestions and contribute.

Industry News and Community Events

LLVM and Clang

Discussions

Commits

  • Added support for capabilities and extensions to the SPIR-V backend. D131221
  • A solver for non-trivial SchedGroup pipelines was added to the AMDGPU backend. The solver consists of an exponential-time exact algorithm and a greedy algorithm, with user-controlled knobs to select between the two. D130797

MLIR

Discussions

Commits

  • Added support for Intel joint matrix ops to the SPIR-V dialect. D131586
  • Made SPIR-V conversion passes OperationPasses, so that downstream compilers can put them in a nested pass manager. D131591
  • Refactored SPIR-V memory space mappings to better serve multiple client APIs (incl., Vulkan and OpenCL). D131409, D131410, D131411

OpenMP (Target Offloading)

Discussions

Commits

  • Fixed detecting CUDA compute capability between images (e.g., sm_60 image and sm_62 GPU). D131567
  • libelf will be replaced with LLVM’s ELF handling. D131401
  • dl will be replaced with LLVM’s dynamic library handling. D131401
  • Fixed the driver crashing when trying to output multiple files in device-only mode. D132248
  • Adding features to extract images from offloading images with clang-offload-packager. D129507

External Compilers

LLPC