[all-commits] [llvm/llvm-project] 2d789f: [VPlan] Verify and handle FOR legality during head...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2d789ff783024f928699ea5b2fb95b25824217b7
      https://github.com/llvm/llvm-project/commit/2d789ff783024f928699ea5b2fb95b25824217b7
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-04-26 (Sun, 26 Apr 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/lib/Transforms/Vectorize/VPlanUtils.cpp
    M llvm/lib/Transforms/Vectorize/VPlanUtils.h
    M llvm/test/Transforms/LoopVectorize/VPlan/vplan-print-after-all.ll
    M llvm/test/Transforms/LoopVectorize/induction.ll
    M llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll
    M llvm/test/Transforms/LoopVectorize/tail-folding-vectorization-factor-1.ll

  Log Message:
  -----------
  [VPlan] Verify and handle FOR legality during header phi creation (NFC). (#191298)

Move the logic to validate FOR users and introduce the split directly to
header phi creation. It makes sense to introduce the header phi and the
splice together.

It also means sinking only needs to be done once, instead for each
VPlan.

Depends on https://github.com/llvm/llvm-project/pull/190681.

PR: https://github.com/llvm/llvm-project/pull/191298



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