[all-commits] [llvm/llvm-project] 6c3451: [VPlan] Add VPReductionPHIRecipe (NFC).

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6c3451cd76cbd0cd973d9c2b08b168dcd0bce3c2
      https://github.com/llvm/llvm-project/commit/6c3451cd76cbd0cd973d9c2b08b168dcd0bce3c2
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2021-07-06 (Tue, 06 Jul 2021)

  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/lib/Transforms/Vectorize/VPlanValue.h
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-sink-replicate-region.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing.ll

  Log Message:
  -----------
  [VPlan] Add VPReductionPHIRecipe (NFC).

This patch is a first step towards splitting up VPWidenPHIRecipe into
separate recipes for the 3 distinct cases they model:

    1. reduction phis,
    2. first-order recurrence phis,
    3. pointer induction phis.

This allows untangling the code generation and allows us to reduce the
reliance on LoopVectorizationCostModel during VPlan code generation.

Discussed/suggested in D100102, D100113, D104197.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D104989