[PATCH] D147964: [VPlan] Introduce new entry block to VPlan for early SCEV expansion.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: Ayal, gilr, rengolin.
Herald added subscribers: StephenFan, tschuett, psnobl, rogfer01, javed.absar, bollu, hiraditya.
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fhahn requested review of this revision.
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This patch adds a new entry block the VPlan to place early SCEV
expansions like the trip count.

It updates createVectorizedLoopSkeleton to take a VPlan & State as
arguments, which can then be used to access the trip count. This is a
first step towards modeling skeleton construction in VPlan and a start
of gradually moving parts of createVectorizedLoopSkeleton towards VPlan.

At the moment, the new preheader is executed before
createVectorizedLoopSkeleton is called, and the rest afterwards.

I will share a follow-up patch that also expands step expressions early
to fix #58811.

Still WIP as some tests need to be updated.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147964

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/VPlan.cpp
  llvm/lib/Transforms/Vectorize/VPlan.h
  llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

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