[PATCH] D142895: [VPlan] Move mayHaveSideeffects for FORs check to VPlan.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: Ayal, gilr, rengolin.
Herald added subscribers: StephenFan, tschuett, psnobl, rogfer01, bollu, hiraditya.
Herald added a project: All.
fhahn requested review of this revision.
Herald added subscribers: pcwang-thead, vkmr.
Herald added a project: LLVM.

This patch moves the check if sink candidate may have sideeffects to
VPlan. Unfortunately this requires adding logic to try to convert
first-order recurrence phis to induction phis with an assumption. This
is because Legal tries to convert phis to inductions using PSE if they
cannot be converted to a FOR.

The current state of this patch is not ideal, the question is if there's
a better option to handle the fallback to predicated inductions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142895

Files:
  llvm/include/llvm/Transforms/Vectorize/LoopVectorizationLegality.h
  llvm/lib/Analysis/IVDescriptors.cpp
  llvm/lib/Transforms/Vectorize/LoopVectorizationLegality.cpp
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/VPlan.h
  llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
  llvm/lib/Transforms/Vectorize/VPlanTransforms.h
  llvm/test/Transforms/LoopVectorize/AArch64/no_vector_instructions.ll
  llvm/test/Transforms/LoopVectorize/induction.ll

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