[PATCH] D31919: NewGVN: Don't propagate over phi backedges where undef causes us to have >1 value.

[Daniel Berlin via Phabricator via llvm-commits]

dberlin created this revision.
Herald added a subscriber: Prazek.

Fixes PR 32607 by only ignoring undef when we can prove the phi is cycle-free


https://reviews.llvm.org/D31919

Files:
  lib/Transforms/Scalar/NewGVN.cpp
  test/Transforms/NewGVN/basic-cyclic-opt.ll
  test/Transforms/NewGVN/pr31682.ll
  test/Transforms/NewGVN/pr32607.ll

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