[PATCH] D116953: AMDGPU: Optimize outgoing workitem ID based on reqd_work_group_size

[Matt Arsenault via Phabricator via llvm-commits]

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If we know we we aren't using a component from the kernel, we can save
a few bit packing instructions.

      

We're still enabling the VGPR input to the kernel though.


https://reviews.llvm.org/D116953

Files:
  llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp
  llvm/lib/Target/AMDGPU/SIISelLowering.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-call-implicit-args.ll
  llvm/test/CodeGen/AMDGPU/call-reqd-group-size.ll

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