[PATCH] D87293: [GVN] Fix undef incoming value for phi node when new loop exit block created.

[weiwei via Phabricator via llvm-commits]

wwei created this revision.
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In order to preserve LoopSimplify, SplitCriticalEdge will generate a new exit block,
which may become a new dominance frontier for dead blocks. After that, we need to
add this block to DF list, and update the undef incoming value for phi correctly.

      

Bugzilla:https://bugs.llvm.org/show_bug.cgi?id=47462


Repository:
  rZORG LLVM Github Zorg

https://reviews.llvm.org/D87293

Files:
  llvm/lib/Transforms/Scalar/GVN.cpp
  llvm/test/Transforms/GVN/pr47462.ll

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