[PATCH] D43177: Mark MergedLoadStoreMotion as not preserving MemDep results

[Björn Steinbrink via Phabricator via llvm-commits]

dotdash created this revision.
dotdash added reviewers: davide, Gerolf.

MemDep caches results that signify that a dependence is non-local, and
there is currently no way to invalidate such cache entries.
Unfortunately, when MLSM sinks a store that can result in a non-local
dependence becoming a local one, and then MemDep gives wrong answers.
The easiest way out here is to just say that MLSM does indeed not
preserve MemDep results.


Repository:
  rL LLVM

https://reviews.llvm.org/D43177

Files:
  lib/Transforms/Scalar/MergedLoadStoreMotion.cpp
  test/Transforms/GVN/pr36063.ll

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