[all-commits] [llvm/llvm-project] ef9ec4: [OpenMP] Add the `ompx_attribute` clause for targe...

[Johannes Doerfert via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ef9ec4bbcca2fa4f64df47bc426f1d1c59ea47e2
      https://github.com/llvm/llvm-project/commit/ef9ec4bbcca2fa4f64df47bc426f1d1c59ea47e2
  Author: Johannes Doerfert <johannes at jdoerfert.de>
  Date:   2023-07-24 (Mon, 24 Jul 2023)

  Changed paths:
    M clang/include/clang/AST/OpenMPClause.h
    M clang/include/clang/AST/RecursiveASTVisitor.h
    M clang/include/clang/Basic/DiagnosticGroups.td
    M clang/include/clang/Basic/DiagnosticParseKinds.td
    M clang/include/clang/Parse/Parser.h
    M clang/include/clang/Sema/Sema.h
    M clang/lib/AST/OpenMPClause.cpp
    M clang/lib/AST/StmtProfile.cpp
    M clang/lib/CodeGen/CGOpenMPRuntime.cpp
    M clang/lib/CodeGen/CodeGenModule.h
    M clang/lib/CodeGen/Targets/AMDGPU.cpp
    M clang/lib/CodeGen/Targets/NVPTX.cpp
    M clang/lib/Parse/ParseOpenMP.cpp
    M clang/lib/Sema/SemaDeclAttr.cpp
    M clang/lib/Sema/SemaOpenMP.cpp
    M clang/lib/Sema/TreeTransform.h
    M clang/lib/Serialization/ASTReader.cpp
    M clang/lib/Serialization/ASTWriter.cpp
    A clang/test/OpenMP/ompx_attributes_codegen.cpp
    A clang/test/OpenMP/ompx_attributes_messages.cpp
    M clang/tools/libclang/CIndex.cpp
    M llvm/include/llvm/Frontend/OpenMP/OMP.td

  Log Message:
  -----------
  [OpenMP] Add the `ompx_attribute` clause for target directives

CUDA and HIP have kernel attributes to tune the code generation (in the
backend). To reuse this functionality for OpenMP target regions we
introduce the `ompx_attribute` clause that takes these kernel
attributes and emits code as if they had been attached to the kernel
fuction (which is implicitly generated).

To limit the impact, we only support three kernel attributes:
`amdgpu_waves_per_eu`, for AMDGPU
`amdgpu_flat_work_group_size`, for AMDGPU
`launch_bounds`, for NVPTX

The existing implementations of those attributes are used for error
checking and code generation. `ompx_attribute` can be attached to any
executable target region and it can hold more than one kernel attribute.

Differential Revision: https://reviews.llvm.org/D156184