[PATCH] D115793: [VPlan] Create header & latch blocks for plan skeleton up front (NFC).

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
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By creating the header and latch blocks up front and adding blocks and
recipes in between those 2 blocks we ensure that the entry and exits of
the plan remain valid throughout construction.

In order to avoid test changes and keep printing of the plans the same,
we use the new header block instead of creating a new block on the first
iteration of the loop traversing the original loop.

We also fold the latch into its predecessor.

This is a follow up to a post-commit suggestion in D114586 <https://reviews.llvm.org/D114586>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D115793

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

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