[PATCH] D86280: [DSE,MemorySSA] Split off partial tracking from isOverwite.

[Florian Hahn via Phabricator via llvm-commits]

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

When traversing memory uses to look for aliasing reads/writes, we only
care about complete overwrites. This patch splits off the partial
overwrite tracking from isOverwrite This avoids some unnecessary work
when checking for read/write clobbers with MemorySSA-DSE.
isOverwrite, which skips the partial overwrite tracking.

This gives a relatively small improvement
http://llvm-compile-time-tracker.com/compare.php?from=ef2a2f77f87553a0a4a39f518eb9ac86b756bda6&to=658f3905dd96d3415f3782adc712c79fa59a4665&stat=instructions

This is part of the patches to bring down compile-time to the level
referenced in
http://lists.llvm.org/pipermail/llvm-dev/2020-August/144417.html


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D86280

Files:
  llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp

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