[PATCH] D147471: [VPlan] Don't add live-outs if scalar epilogue is required.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
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Instead of clearing live outs when a scalar epilogue is required late,
don't add live outs during VPlan construction if a scalar epilogue is
required.

This enables more VPlan-based DCE (if the live out would be the only
user in the plan) and is a step towards removing an access of the cost
model in fixedVectorizedLoop (which is after VPlan execution).

Depends on D147468 <https://reviews.llvm.org/D147468>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147471

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/VPlan.cpp
  llvm/lib/Transforms/Vectorize/VPlan.h
  llvm/test/Transforms/LoopVectorize/loop-form.ll

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