[PATCH] D113180: [LoopVectorize] Make VPWidenCanonicalIVRecipe::execute work for scalable vectors

[David Sherwood via Phabricator via llvm-commits]

david-arm created this revision.
david-arm added reviewers: sdesmalen, kmclaughlin, peterwaller-arm, fhahn.
Herald added subscribers: ctetreau, rogfer01, hiraditya, kristof.beyls.
david-arm requested review of this revision.
Herald added subscribers: llvm-commits, vkmr.
Herald added a project: LLVM.

The code in VPWidenCanonicalIVRecipe::execute only worked for fixed-width
vectors due to the way we generate the values per lane. This patch changes
the code to use a combination of vector splats and step vectors to get
the same result. This then works for both fixed-width and scalable vectors.

Tests that exercise this code path for scalable vectors have been added here:

  Transforms/LoopVectorize/AArch64/sve-tail-folding.ll


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D113180

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/VPlan.cpp
  llvm/lib/Transforms/Vectorize/VPlan.h
  llvm/test/Transforms/LoopVectorize/AArch64/sve-tail-folding.ll

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