[PATCH] D131015: [LV] Track all IR blocks corresponding to VPBasicBlock

[Philip Reames via Phabricator via llvm-commits]

reames created this revision.
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When working with edges entering or leaving a VPBasicBlock, we need to use either the first or last IR block corresponding to the VPBasicBlock.  The existing code is only correct when a VPBasicBlock in the header or latch position corresponds to exactly one BasicBlock.  This happens to be true as the only VPBasicBlock which corresponds to more than one BasicBlock today is a VPReplicateRecipe which (as an implementation detail) can't be either a loop header or latch.

I decided to track the whole set for simplicity.  It feels odd to not have a way to map IR blocks to VP blocks and vice versa, so since I was changing it anyways, figured I'd just track the whole set.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131015

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

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