[all-commits] [llvm/llvm-project] a55fba: [VPlan] Run initial recipe simplification on VPlan...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a55fbab0cffc9b4af497b9e4f187b61143743e06
      https://github.com/llvm/llvm-project/commit/a55fbab0cffc9b4af497b9e4f187b61143743e06
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-02-13 (Fri, 13 Feb 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlanAnalysis.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/VPlan/icmp-uniforms.ll
    M llvm/test/Transforms/LoopVectorize/X86/cost-conditional-branches.ll
    M llvm/test/Transforms/LoopVectorize/X86/drop-poison-generating-flags.ll
    M llvm/test/Transforms/LoopVectorize/X86/pr141968-instsimplifyfolder.ll
    M llvm/test/Transforms/LoopVectorize/epilog-vectorization-reductions.ll
    M llvm/test/Transforms/LoopVectorize/pr154045-dont-fold-extractelement-livein.ll
    M llvm/test/Transforms/LoopVectorize/select-neg-cond.ll

  Log Message:
  -----------
  [VPlan] Run initial recipe simplification on VPlan0. (#176828)

In some cases, LV gets simplifyable IR as input. Directly apply
simplifications on the initial VPlan0 to avoid vectorization in cases
where the loop body can be folded away.

Using the end-to-end pipeline, this is relatively rare, but when
reducing test cases, the reduction often ends up with cases with trivial
folds. Rejecting those will result in more robust & realistic test
cases.

As follow-up, I also plan to add initial dead recipe removal.

Depends on https://github.com/llvm/llvm-project/pull/176795.

PR: https://github.com/llvm/llvm-project/pull/176828



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