[all-commits] [llvm/llvm-project] 8f1217: [VPlan] Use VPlan to check if only the first lane ...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8f12175fedd2bb2b138c635fdeb924d4b3d146c9
      https://github.com/llvm/llvm-project/commit/8f12175fedd2bb2b138c635fdeb924d4b3d146c9
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2022-01-30 (Sun, 30 Jan 2022)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/X86/conversion-cost.ll
    M llvm/test/Transforms/LoopVectorize/X86/uniform_mem_op.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll
    M llvm/test/Transforms/LoopVectorize/loop-form.ll

  Log Message:
  -----------
  [VPlan] Use VPlan to check if only the first lane is used.

This removes the remaining dependence on LoopVectorizationCostModel from
buildScalarSteps and is required so it can be moved out of ILV.

It also improves allows us to remove a few unneeded instructions.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D116554