[PATCH] D155213: [HIP] Add `-fno-hip-uniform-block`

[Yaxun Liu via Phabricator via cfe-commits]

yaxunl created this revision.
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By default, clang assumes HIP kernels are launched with uniform block size,
which is the case for kernels launched through triple chevron or
hipLaunchKernelGGL. Clang adds uniform-work-group-size function attribute
to HIP kernels to allow the backend to do optimizations on that.

However, in some rare cases, HIP kernels can be launched
through hipExtModuleLaunchKernel where global work size is specified,
which may result in non-uniform block size.

To be able to support non-uniform block size for HIP kernels,
an option `-f[no-]hip-uniform-block is added. By default it is on.


https://reviews.llvm.org/D155213

Files:
  clang/include/clang/Basic/LangOptions.def
  clang/include/clang/Driver/Options.td
  clang/lib/CodeGen/CGCall.cpp
  clang/lib/CodeGen/Targets/AMDGPU.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/CodeGenHIP/default-attributes.hip
  clang/test/Driver/hip-options.hip

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