[PATCH] D139927: [VPlan] Remove redundant blocks by merging them into predecessors.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: Ayal, gilr, rengolin.
Herald added subscribers: tschuett, psnobl, rogfer01, bollu, hiraditya.
Herald added a project: All.
fhahn requested review of this revision.
Herald added subscribers: pcwang-thead, vkmr.
Herald added a project: LLVM.

Add and run VPlan transform to fold blocks with a single predecessor
into the predecessor. This remove redundant blocks and addresses a TODO
to replace special handling for the vector latch VPBB.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D139927

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
  llvm/lib/Transforms/Vectorize/VPlanTransforms.h
  llvm/test/Transforms/LoopVectorize/first-order-recurrence-sink-replicate-region.ll
  llvm/test/Transforms/LoopVectorize/interleave-and-scalarize-only.ll
  llvm/test/Transforms/LoopVectorize/vplan-iv-transforms.ll
  llvm/test/Transforms/LoopVectorize/vplan-printing.ll
  llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge-vf1.ll
  llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge.ll

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