[PATCH] D131276: AMDGPU: Implicit kernel arguments related optimization when uniform-workgroup-size=true

[Changpeng Fang via Phabricator via llvm-commits]

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Under code object version 5, __ockl_get_local_size returns the value computed by the expression:
 workgroup_id < hidden_block_count ? hidden_group_size : hidden_remainder
For functions with the attribute uniform-work-group-size=true. we can evaluate workgroup_id < hidden_block_count
 as true, and thus hidden_group_size is returned for __ockl_get_local_size.

With uniform-workgroup-size=true, this work also set all remainders to zero, and if there
is reqd_work_group_size, we also set work-group-size to the required value from the metadata.


https://reviews.llvm.org/D131276

Files:
  llvm/lib/Target/AMDGPU/AMDGPULowerKernelAttributes.cpp
  llvm/test/CodeGen/AMDGPU/implicit-arg-v5-opt.ll

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