[PATCH] D95039: [SVE] Add support for scalable vectorization of loops with selects and cmps

[David Sherwood via Phabricator via llvm-commits]

david-arm created this revision.
david-arm added reviewers: sdesmalen, CarolineConcatto, kmclaughlin, c-rhodes.
Herald added subscribers: NickHung, psnobl, hiraditya, kristof.beyls, tschuett.
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I have removed an unnecessary assert in LoopVectorizationCostModel::getInstructionCost
that prevented a cost being calculated for select instructions when using
scalable vectors. In addition, I have changed AArch64TTIImpl::getCmpSelInstrCost
to only do special cost calculations for fixed width vectors and fall
back to the base version for scalable vectors.

I have added a simple cost model test for cmps and selects:

  test/Analysis/CostModel/sve-cmpsel.ll

and some simple tests that show we vectorize loops with cmp and select:

  test/Transforms/LoopVectorize/AArch64/sve-basic-vec.ll


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95039

Files:
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/test/Analysis/CostModel/sve-cmpsel.ll
  llvm/test/Transforms/LoopVectorize/AArch64/sve-basic-vec.ll

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