[all-commits] [llvm/llvm-project] 95f76b: [LV] Create & use VPScalarIVSteps for all scalar u...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 95f76bff1c40bc1c2f1ff0b6d288f80967f0ba08
      https://github.com/llvm/llvm-project/commit/95f76bff1c40bc1c2f1ff0b6d288f80967f0ba08
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2022-03-13 (Sun, 13 Mar 2022)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-gather-scatter.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-inductions.ll
    M llvm/test/Transforms/LoopVectorize/ARM/mve-gather-scatter-tailpred.ll
    M llvm/test/Transforms/LoopVectorize/ARM/tail-folding-not-allowed.ll
    M llvm/test/Transforms/LoopVectorize/X86/conversion-cost.ll
    M llvm/test/Transforms/LoopVectorize/X86/gather_scatter.ll
    M llvm/test/Transforms/LoopVectorize/X86/load-deref-pred.ll
    M llvm/test/Transforms/LoopVectorize/X86/optsize.ll
    M llvm/test/Transforms/LoopVectorize/X86/pr36524.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-sink-replicate-region.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll
    M llvm/test/Transforms/LoopVectorize/float-induction.ll
    M llvm/test/Transforms/LoopVectorize/icmp-uniforms.ll
    M llvm/test/Transforms/LoopVectorize/induction.ll
    M llvm/test/Transforms/LoopVectorize/instruction-only-used-outside-of-loop.ll
    M llvm/test/Transforms/LoopVectorize/iv_outside_user.ll
    M llvm/test/Transforms/LoopVectorize/loop-form.ll
    M llvm/test/Transforms/LoopVectorize/pr39417-optsize-scevchecks.ll
    M llvm/test/Transforms/LoopVectorize/scalable-inductions.ll
    M llvm/test/Transforms/LoopVectorize/single-value-blend-phis.ll
    M llvm/test/Transforms/LoopVectorize/uniform-blend.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing.ll
    M llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge.ll

  Log Message:
  -----------
  [LV] Create & use VPScalarIVSteps for all scalar users.

This patch is a follow-up to D115953. It updates optimizeInductions
to also introduce new VPScalarIVStepsRecipes if an IV has both vector
and scalar uses.

It updates all uses that only need scalar values to use the newly
created recipe for the scalar steps.

This completes untangling of VPWidenIntOrFpInductionRecipe
code-generation. Now the recipe *only* creates the widened vector
values, as it says on the tin.

The code to genereate IR has been moved directly to
VPWidenIntOrFpInductionRecipe::execute.

Note that the recipe has been updated to hold a reference to
ScalarEvolution, which is needed to expand the step, until we can place
the corresponding SCEV expansion in the pre-header.

Depends on D120827.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D120828