[all-commits] [llvm/llvm-project] 20fbbd: [LV] Add support for cmp reductions with decreasin...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 20fbbd76755c2ddee515f09e96c59d519aef13e5
      https://github.com/llvm/llvm-project/commit/20fbbd76755c2ddee515f09e96c59d519aef13e5
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-06-29 (Sun, 29 Jun 2025)

  Changed paths:
    M llvm/include/llvm/Analysis/IVDescriptors.h
    M llvm/lib/Analysis/IVDescriptors.cpp
    M llvm/lib/Transforms/Utils/LoopUtils.cpp
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.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/VPlanUnroll.cpp
    M llvm/test/Transforms/LoopVectorize/iv-select-cmp-decreasing.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing-reductions.ll

  Log Message:
  -----------
  [LV] Add support for cmp reductions with decreasing IVs. (#140451)

Similar to FindLastIV, add FindFirstIVSMin to support select (icmp(), x, y)
reductions where one of x or y is a decreasing induction, producing a SMin
 reduction. It uses signed max as sentinel value.

PR: https://github.com/llvm/llvm-project/pull/140451



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