[all-commits] [llvm/llvm-project] 6108d5: [VPlan] Add ReductionStartVector VPInstruction. (#...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6108d50aed6190aa094c168f96899adc5621cc89
      https://github.com/llvm/llvm-project/commit/6108d50aed6190aa094c168f96899adc5621cc89
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-06-09 (Mon, 09 Jun 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.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/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/epilog-iv-select-cmp.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-dot-product-epilogue.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/vplan-printing.ll
    M llvm/test/Transforms/LoopVectorize/PowerPC/exit-branch-cost.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-cond-reduction.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-reduction.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/vplan-vp-intrinsics-reduction.ll
    M llvm/test/Transforms/LoopVectorize/X86/cost-model.ll
    M llvm/test/Transforms/LoopVectorize/X86/reduction-small-size.ll
    M llvm/test/Transforms/LoopVectorize/epilog-iv-select-cmp.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-sink-replicate-region.ll
    M llvm/test/Transforms/LoopVectorize/if-pred-stores.ll
    M llvm/test/Transforms/LoopVectorize/induction.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing-reductions.ll

  Log Message:
  -----------
  [VPlan] Add ReductionStartVector VPInstruction. (#142290)

Add a new VPInstruction::ReductionStartVector opcode to create the start
values for wide reductions. This more accurately models the start value
creation in VPlan and simplifies VPReductionPHIRecipe::execute. Down the
line it also allows removing VPReductionPHIRecipe::RdxDesc.

PR: https://github.com/llvm/llvm-project/pull/142290



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