[PATCH] D157714: [VPlan] Move addition of canonical IV increments & branches later. (WIP)

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: Ayal, gilr, rengolin.
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This patch breaks up quite complicated addCanonicalIVRecipes into 2
distinct parts

1. Initially, only create an incomplete VPCanonicalIVPHI recipe
2. Introduce the canonical IV increments and branches later in separate transform.

This gradual lowering makes initial construction simpler and allows
introducing VF & UF specific increments late when they are fixed. It
also enables introducing VPActiveLaneMaskPHIRecipe directly when needed
(tail folding).

It should also allow introducing additional ingredients like
explicit-vector length handling gradually.

Depends on D157713 <https://reviews.llvm.org/D157713>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157714

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

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