[PATCH] D75500: StructurizeCFG: simplify phi nodes when possible

[Sameer Sahasrabuddhe via Phabricator via llvm-commits]

sameerds created this revision.
Herald added subscribers: llvm-commits, kerbowa, hiraditya, nhaehnle, jvesely.
Herald added a project: LLVM.
sameerds added reviewers: arsenm, nhaehnle, rampitec.
Herald added a subscriber: wdng.

After structurization, some phi nodes can have a single incoming edge
and can be simplified away. This change runs a simplify query on all
phis that are either modified or added by the structurizer. This also
moves some phis closer to their use as a side benefit.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D75500

Files:
  llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
  llvm/test/CodeGen/AMDGPU/loop_break.ll
  llvm/test/CodeGen/AMDGPU/nested-loop-conditions.ll
  llvm/test/Transforms/StructurizeCFG/AMDGPU/loop-subregion-misordered.ll

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