[all-commits] [llvm/llvm-project] cc6d78: [VPlan] Fold shifts by zero. (#223276)

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cc6d78e8eea21e0ddc5376b1700af00e33a77e17
      https://github.com/llvm/llvm-project/commit/cc6d78e8eea21e0ddc5376b1700af00e33a77e17
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-09-13 (Sun, 13 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/RISCV/type-info-cache-evl-crash.ll
    M llvm/test/Transforms/LoopVectorize/VPlan/vplan-scev-address-idioms.ll
    M llvm/test/Transforms/LoopVectorize/X86/predicated-instruction-cost.ll
    M llvm/test/Transforms/LoopVectorize/X86/predicated-udiv.ll
    M llvm/test/Transforms/LoopVectorize/uniform_across_vf_induction1.ll
    M llvm/test/Transforms/LoopVectorize/uniform_across_vf_induction1_lshr.ll
    M llvm/test/Transforms/LoopVectorize/uniform_across_vf_induction2.ll

  Log Message:
  -----------
  [VPlan] Fold shifts by zero. (#223276)

Add trivial folds of shifts by zero. This allows us to match IR SCEV
behavior (which looks through trivial shifts), w/o explicitly handling
those in getSCEVExprForVPValue.



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