[PATCH] D48914: [PGOMemOPSize] Preserve the DominatorTree

[Chijun Sima via Phabricator via llvm-commits]

NutshellySima created this revision.
NutshellySima added reviewers: kuhar, davide, dmgreen.
Herald added a subscriber: llvm-commits.

PGOMemOPSize only modifies CFG in a couple of places; thus we can preserve the DominatorTree with little effort.
When optimizing SQLite with -O3, this patch can decrease 3.8% of the numbers of nodes traversed by DFS and 5.7% of the times DominatorTreeBase::recalculation is called.


Repository:
  rL LLVM

https://reviews.llvm.org/D48914

Files:
  lib/Transforms/Instrumentation/PGOMemOPSizeOpt.cpp
  test/Other/opt-O2-pipeline.ll
  test/Other/opt-O3-pipeline.ll

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