[PATCH] D149161: AMDGPU: Fix an assertion in SIOptimizeVGPRLiveRange

[Nicolai Hähnle via Phabricator via llvm-commits]

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As the comment notes, the shader results in an INSERT_SUBREG with
"undef" (dead) operand in the Endif block. The register is considered
dead from a liveness analysis perspective. The correct thing to do seems
to be nothing: we keep the undef use of the register, the register
allocator should still be able to take the liveness into account
correctly.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149161

Files:
  llvm/lib/Target/AMDGPU/SIOptimizeVGPRLiveRange.cpp
  llvm/test/CodeGen/AMDGPU/bug-deadlanes.ll

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