[PATCH] D126525: [SSAUpdaterImpl] Do not generate phi node with all the same incoming values

[Serguei Katkov via Phabricator via llvm-commits]

skatkov created this revision.
skatkov added reviewers: reames, dantrushin, asbirlea, djtodoro, StephenTozer, foad, sameerds.
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If all available vals to basic block are the same - do not build new phi node and
just use this val.


https://reviews.llvm.org/D126525

Files:
  llvm/include/llvm/Transforms/Utils/SSAUpdaterImpl.h
  llvm/test/CodeGen/AArch64/tail-dup-redundant-phi.mir
  llvm/test/CodeGen/AMDGPU/nested-loop-conditions.ll
  llvm/test/CodeGen/WebAssembly/lower-em-ehsjlj.ll
  llvm/test/Transforms/LICM/sink-debuginfo-preserve.ll

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