[PATCH] D143741: [VirtRegMap] Further optimize emitting KILL for copy

[Christudasan Devadasan via Phabricator via llvm-commits]

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Do not emit KILL when the identical register copy
instruction has the implicit operands which are
only reserved registers as there is no liveness
info to be tracked for reserved registers.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143741

Files:
  llvm/lib/CodeGen/VirtRegMap.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.wqm.demote.ll
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.softwqm.ll
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.wqm.demote.ll
  llvm/test/CodeGen/AMDGPU/optimize-kill.mir
  llvm/test/CodeGen/AMDGPU/wqm.ll

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