[PATCH] D76364: [AMDGPU] Fix AMDGPUUnifyDivergentExitNodes

[Piotr Sobczak via Phabricator via llvm-commits]

piotr created this revision.
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For the case where "done" bits on existing exports are removed
by unifyReturnBlockSet(), unify all return blocks - even the
uniformly reached ones. We do not want to end up with a non-unified,
uniformly reached block containing a normal export with the "done"
bit cleared.

That case is believed to be rare - possible with infinite loops
in pixel shaders.

This is a fix for D71192 <https://reviews.llvm.org/D71192>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D76364

Files:
  llvm/lib/Target/AMDGPU/AMDGPUUnifyDivergentExitNodes.cpp
  llvm/test/CodeGen/AMDGPU/multi-divergent-exit-region.ll
  llvm/test/CodeGen/AMDGPU/update-phi.ll

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