[all-commits] [llvm/llvm-project] 1484f8: [VPlan] Add VPInstruction::StepVector and use it i...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1484f82cbc62eab9c4c8f393b84c2f521bf882f6
      https://github.com/llvm/llvm-project/commit/1484f82cbc62eab9c4c8f393b84c2f521bf882f6
  Author: Luke Lau <luke at igalia.com>
  Date:   2025-05-08 (Thu, 08 May 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/test/Transforms/LoopVectorize/AArch64/clamped-trip-count.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/divs-with-scalable-vfs.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/scalable-avoid-scalarization.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-inductions-unusual-types.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-interleaved-accesses.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-interleaved-masked-accesses.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/dead-ops-cost.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/induction-costs.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/mask-index-type.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/pr87378-vpinstruction-or-drop-poison-generating-flags.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/strided-accesses.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/uniform-load-store.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-cond-reduction.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-interleave.ll
    M llvm/test/Transforms/LoopVectorize/scalable-iv-outside-user.ll

  Log Message:
  -----------
  [VPlan] Add VPInstruction::StepVector and use it in VPWidenIntOrFpInductionRecipe (#129508)

Split off from #118638, this adds VPInstruction::StepVector, which
generates integer step vectors (0,1,2,...,VF). This is a step towards
eventually modelling all the separate parts of
VPWidenIntOrFpInductionRecipe in VPlan.

This is then used by VPWidenIntOrFpInductionRecipe, where we materialize
it just before unrolling so the operands stay in a fixed position.

The need for a separate operand in VPWidenIntOrFpInductionRecipe, as
well as the need to update it in
optimizeVectorInductionWidthForTCAndVFUF, should be removed with #118638
when everything is expanded in convertToConcreteRecipes.



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