[PATCH] D86534: [GVN] Preserve MemorySSA if it is available.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: asbirlea, george.burgess.iv.
Herald added subscribers: dexonsmith, hiraditya, Prazek.
Herald added a project: LLVM.
fhahn requested review of this revision.

Preserve MemorySSA if it is available before running GVN.

DSE with MemorySSA will run closely after GVN. If GVN and 2 other
passes preserve MemorySSA, DSE can re-use MemorySSA used by LICM
when doing LTO.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D86534

Files:
  llvm/include/llvm/Transforms/Scalar/GVN.h
  llvm/lib/Transforms/Scalar/GVN.cpp

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