[PATCH] D98659: [MachineCopyPropagation] Do more backward copy propagations

[yshui via Phabricator via llvm-commits]

yshui updated this revision to Diff 330966.
yshui added a comment.

Strengthen the invariant maintained by the CopyTracker.

`trackUse` assumed that when a copy instruction exists in `Copies`, it can be found via both its `Def` and its `Src`. This wasn't true previously, causing segfaults because `findCopyDefViaUnit` returned `nullptr`.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D98659/new/

https://reviews.llvm.org/D98659

Files:
  llvm/lib/CodeGen/MachineCopyPropagation.cpp

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