[all-commits] [llvm/llvm-project] cba24d: [VPlan] Generalize folding IV increment into phi s...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cba24d6a935382154b0487d09c1d91a0e2bda04b
      https://github.com/llvm/llvm-project/commit/cba24d6a935382154b0487d09c1d91a0e2bda04b
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-09-13 (Sun, 13 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

  Log Message:
  -----------
  [VPlan] Generalize folding IV increment into phi start value (NFC). (#223260)

simplifyRecipe folds

  X    = phi(0, IVInc)
  IVInc = X + Step
  Def   = IVInc + Y

into a phi starting at Y, but only if Y is a live-in. Also allow values
defined in the block the phi's start value is coming from, which is
where the value conservatively has to be available.

NFC today, but preparation for modeling the full epilogue skeleton in
VPlan.



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