[PATCH] D79068: [MemorySSA] Pass DT to the upward iterator for proper PhiTranslation.

[Alina Sbirlea via Phabricator via llvm-commits]

asbirlea created this revision.
asbirlea added a reviewer: george.burgess.iv.
Herald added subscribers: hiraditya, Prazek.
Herald added a project: LLVM.

A valid DominatorTree is needed to do PhiTranslation.
Before this patch, a MemoryUse could be optimized to an access outside a loop, while the address it loads from is modified in the loop.
This can lead to a miscompile.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79068

Files:
  llvm/include/llvm/Analysis/MemorySSA.h
  llvm/lib/Analysis/MemorySSA.cpp
  llvm/test/Analysis/MemorySSA/phi-translation.ll

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