[all-commits] [llvm/llvm-project] a7fda0: [VPlan] Introduce VPScalarPHIRecipe, use for can &...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a7fda0e1e4dfd17ccf4a1bb80024acca2da6424e
      https://github.com/llvm/llvm-project/commit/a7fda0e1e4dfd17ccf4a1bb80024acca2da6424e
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-12-03 (Tue, 03 Dec 2024)

  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/VPlanAnalysis.cpp
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/lib/Transforms/Vectorize/VPlanValue.h

  Log Message:
  -----------
  [VPlan] Introduce VPScalarPHIRecipe, use for can & EVL IV codegen (NFC). (#114305)

Introduce a general recipe to generate a scalar phi. Lower
VPCanonicalIVPHIRecipe and VPEVLBasedIVRecipe to VPScalarIVPHIrecipe
before plan execution, avoiding the need for duplicated ::execute
implementations. There are other cases that could benefit, including
in-loop reduction phis and pointer induction phis.

Builds on a similar idea as
https://github.com/llvm/llvm-project/pull/82270.

PR: https://github.com/llvm/llvm-project/pull/114305



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