[all-commits] [llvm/llvm-project] fcc419: [LV][NFCI] Swap reduction recipe operand order

[Sam Tebbs via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fcc419b05f62d0f4ae4a13e224d10e9d098a5450
      https://github.com/llvm/llvm-project/commit/fcc419b05f62d0f4ae4a13e224d10e9d098a5450
  Author: Samuel Tebbs <samuel.tebbs at arm.com>
  Date:   2025-07-31 (Thu, 31 Jul 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/scalable-reduction-inloop-cond.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-epilog-vect-inloop-reductions.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-tail-folding-reductions.ll
    M llvm/test/Transforms/LoopVectorize/ARM/mve-reduction-predselect.ll
    M llvm/test/Transforms/LoopVectorize/ARM/mve-reduction-types.ll
    M llvm/test/Transforms/LoopVectorize/ARM/mve-reductions-interleave.ll
    M llvm/test/Transforms/LoopVectorize/ARM/mve-reductions.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/inloop-reduction.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/tail-folding-cond-reduction.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/tail-folding-inloop-reduction.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/tail-folding-intermediate-store.ll
    M llvm/test/Transforms/LoopVectorize/reduction-inloop-cond.ll
    M llvm/test/Transforms/LoopVectorize/reduction-inloop-pred.ll
    M llvm/test/Transforms/LoopVectorize/reduction-inloop-uf4.ll
    M llvm/test/Transforms/LoopVectorize/reduction-inloop.ll
    M llvm/test/Transforms/LoopVectorize/remarks-reduction-inloop.ll
    M llvm/test/Transforms/PhaseOrdering/ARM/arm_mean_q7.ll

  Log Message:
  -----------
  [LV][NFCI] Swap reduction recipe operand order

https://github.com/llvm/llvm-project/pull/147026 will enable sub
reductions, which require that the phi value is the first operand since
they aren't commutative. This re-orders the operands when executing
reductions, which actually matches other existing code in
VPReductionRecipe::execute.



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