[PATCH] D72410: [DSE] Eliminate stores by terminators (free,lifetime.end).

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: dmgreen, rnk, efriedma, bryant, asbirlea, Tyker.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.
fhahn added a parent revision: D72148: [DSE] Support traversing MemoryPhis..

This patch adds support for eliminating stores by free & lifetime.end
calls. We can remove stores that are not read before calling a memory
terminator and we can eliminate all stores after a memory terminator
until we see a new lifetime.start. The second case seems to not really
trigger much in practice though.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72410

Files:
  llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
  llvm/test/Transforms/DeadStoreElimination/MSSA/free.ll
  llvm/test/Transforms/DeadStoreElimination/MSSA/lifetime.ll
  llvm/test/Transforms/DeadStoreElimination/MSSA/simple.ll

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