[PATCH] D45584: [DSE] Teach the pass about partial overwrite of atomic memory intrinsics

[Daniel Neilson via Phabricator via llvm-commits]

dneilson created this revision.
dneilson added reviewers: mkazantsev, skatkov, apilipenko, efriedma, rsmith.

This change teaches DSE that the atomic memory intrinsics can be overwriten
partially in the same way as the non-atomic forms. Specifically, that the
atomic memcpy & memset can be shortened at the end and that the atomic memset
can be shortened at the beginning, if they partially overwritten
by later stores.


Repository:
  rL LLVM

https://reviews.llvm.org/D45584

Files:
  lib/Transforms/Scalar/DeadStoreElimination.cpp
  test/Transforms/DeadStoreElimination/OverwriteStoreBegin.ll
  test/Transforms/DeadStoreElimination/OverwriteStoreEnd.ll

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