[PATCH] D139788: [LV] Sink scalar operands and merge regions repeatedly.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: Ayal, gilr, rengolin.
Herald added subscribers: rogfer01, hiraditya.
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fhahn requested review of this revision.
Herald added subscribers: pcwang-thead, vkmr.
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Merging regions can enable new sinking opportunities (e.g. if users of a
scalar value are moved from different VPBBs into the same VPBB). Sinking
in turn can also enable new merging opportunities (e.g. if a recipe
between to merge-able regions is moved.

To enable more sinking opportunities, repeat sinking & merging if
regions could be merged.

Also fix mergeReplicateRegions to return the correct Changed status.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D139788

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
  llvm/test/Transforms/LoopVectorize/first-order-recurrence-sink-replicate-region.ll
  llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge.ll

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