[PATCH] D123346: AMDGPU: Align the implicit kernel argument segment to 8 bytes for v5

[Changpeng Fang via Phabricator via llvm-commits]

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In emitting metadata for implicit kernel arguments, we need to be in sync with the actual loads
to align the implicit kernel argument segment to 8 byte boundary. In this work, we simply force
this alignment through the first implicit argument.
In addition, we don't emit metadata for any implicit kernel argument if none of them is actually used.


https://reviews.llvm.org/D123346

Files:
  llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.cpp
  llvm/test/CodeGen/AMDGPU/hsa-metadata-queue-ptr-v5.ll
  llvm/test/CodeGen/AMDGPU/hsa-metadata-reduced-hidden-args-v5.ll
  llvm/test/CodeGen/AMDGPU/implicit-kernel-argument-alignment.ll

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