[PATCH] D51960: [EarlyCSEwMemorySSA] Add MSSA verification and tests to make EarlyCSE failures easier to track.

[Alina Sbirlea via Phabricator via llvm-commits]

asbirlea created this revision.
asbirlea added reviewers: george.burgess.iv, gberry.
Herald added subscribers: Prazek, jlebar, sanjoy.

EarlyCSE can make IR changes that will leave MemorySSA with accesses claiming to be optimized, but for which a subsequent MemorySSA run will yield a different optimized result.
Due to relying on AA queries, we can't fix this in general, unless we recompute MemorySSA.
Adding some tests to track this and a basic verify for future potential failures.


Repository:
  rL LLVM

https://reviews.llvm.org/D51960

Files:
  lib/Transforms/Scalar/EarlyCSE.cpp
  test/Transforms/EarlyCSE/preserve_memoryssa.ll

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