[all-commits] [llvm/llvm-project] 055e4f: [VPlan] Don't narrow op multiple times in narrowIn...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 055e4ff35ab0789494ff9a3d41e3182a3aca8d0a
      https://github.com/llvm/llvm-project/commit/055e4ff35ab0789494ff9a3d41e3182a3aca8d0a
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-09-10 (Wed, 10 Sep 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/transform-narrow-interleave-to-widen-memory-with-wide-ops.ll

  Log Message:
  -----------
  [VPlan] Don't narrow op multiple times in narrowInterleaveGroups.

Track which ops already have been narrowed, to avoid narrowing the same
operation multiple times. Repeated narrowing will lead to incorrect
results, because we could first narrow from an interleave group -> wide
load, and then narrow the wide load > single-scalar load.

Fixes thttps://github.com/llvm/llvm-project/issues/156190.



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