[all-commits] [llvm/llvm-project] 58e81d: [VPlan] Use frozen combined condition in early exi...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 58e81dc9a3e25cc41ad26f7cf222dea2c4aa391b
      https://github.com/llvm/llvm-project/commit/58e81dc9a3e25cc41ad26f7cf222dea2c4aa391b
  Author: Luke Lau <luke at igalia.com>
  Date:   2026-09-25 (Fri, 25 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/early_exit_costs.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/simple_early_exit.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/single-early-exit-interleave.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/early-exit-live-out.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/sink-to-early-exit.ll
    M llvm/test/Transforms/LoopVectorize/VPlan/uncountable-early-exit-vplan.ll
    M llvm/test/Transforms/LoopVectorize/dereferenceable-info-from-assumption-constant-size.ll
    M llvm/test/Transforms/LoopVectorize/early-exit-calls.ll
    M llvm/test/Transforms/LoopVectorize/early-exit-load-live-out.ll
    M llvm/test/Transforms/LoopVectorize/early-exit-unary-ops.ll
    M llvm/test/Transforms/LoopVectorize/multiple-early-exits.ll
    M llvm/test/Transforms/LoopVectorize/predicated-early-exits-interleave.ll
    M llvm/test/Transforms/LoopVectorize/predicated-multiple-exits.ll
    M llvm/test/Transforms/LoopVectorize/predicated-single-exit.ll
    M llvm/test/Transforms/LoopVectorize/single-early-exit-cond-poison.ll
    M llvm/test/Transforms/LoopVectorize/single-early-exit-deref-assumptions.ll
    M llvm/test/Transforms/LoopVectorize/single-early-exit-interleave-only.ll
    M llvm/test/Transforms/LoopVectorize/single-early-exit-interleave.ll
    M llvm/test/Transforms/LoopVectorize/single_early_exit.ll
    M llvm/test/Transforms/LoopVectorize/single_early_exit_live_outs.ll
    M llvm/test/Transforms/LoopVectorize/sink-to-early-exit.ll
    M llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination-early-exit.ll
    M llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination-predicated-early-exit.ll

  Log Message:
  -----------
  [VPlan] Use frozen combined condition in early exit first-active-lane (#223643)

Combined is used both to compute if an early exit was taken via
VPInstruction::AnyOf, as well as the index of the early-exited lane in
VPInstruction::FirstActiveLane.

Combined can have poison lanes past the exited lane, so the AnyOf uses
freeze to prevent branching on poison. However FirstActiveLane on a
vector with a poison lane is poison (see #223935), so we need to also
use the frozen version of Combined to prevent poison there.



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