[PATCH] D116123: [VPlan] Handle IV vector splat as VPInstruction.

[Florian Hahn via Phabricator via llvm-commits]

fhahn updated this revision to Diff 402978.
fhahn added a comment.

A major update & simplification: the latest version doesn't need a separate step-vector recipe; if a 'step-vector' is needed, the VPWidenCanonicalInduction recipe is retained. It also removes the VPlan-based analysis of the uses in favor of looking up the recorded information added in D118167 <https://reviews.llvm.org/D118167>.

Note that it still checks if all users of the induction are active-lane-masks. The legacy cost-model doesn't know about them, but if it all users are active-lane-masks, no widened canonical IV is needed, only the scalar steps.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D116123/new/

https://reviews.llvm.org/D116123

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
  llvm/test/Transforms/LoopVectorize/AArch64/sve-tail-folding-forced.ll
  llvm/test/Transforms/LoopVectorize/AArch64/sve-tail-folding.ll
  llvm/test/Transforms/LoopVectorize/AArch64/tail-fold-uniform-memops.ll
  llvm/test/Transforms/LoopVectorize/ARM/mve-gather-scatter-tailpred.ll
  llvm/test/Transforms/LoopVectorize/ARM/mve-reduction-types.ll
  llvm/test/Transforms/LoopVectorize/X86/constant-fold.ll
  llvm/test/Transforms/LoopVectorize/X86/optsize.ll
  llvm/test/Transforms/LoopVectorize/X86/pr34438.ll
  llvm/test/Transforms/LoopVectorize/X86/small-size.ll
  llvm/test/Transforms/LoopVectorize/X86/tail_loop_folding.ll
  llvm/test/Transforms/LoopVectorize/X86/vect.omp.force.small-tc.ll
  llvm/test/Transforms/LoopVectorize/dont-fold-tail-for-const-TC.ll
  llvm/test/Transforms/LoopVectorize/dont-fold-tail-for-divisible-TC.ll
  llvm/test/Transforms/LoopVectorize/first-order-recurrence-sink-replicate-region.ll
  llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll
  llvm/test/Transforms/LoopVectorize/pr44488-predication.ll
  llvm/test/Transforms/LoopVectorize/pr45679-fold-tail-by-masking.ll
  llvm/test/Transforms/LoopVectorize/pr46525-expander-insertpoint.ll
  llvm/test/Transforms/LoopVectorize/pr51614-fold-tail-by-masking.ll
  llvm/test/Transforms/LoopVectorize/select-reduction.ll
  llvm/test/Transforms/LoopVectorize/tail-folding-vectorization-factor-1.ll

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