[all-commits] [llvm/llvm-project] d3afa1: [LV] Don't scalarize loads that need predication i...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d3afa171ee236dfef4b7cd4b4dd0b0fb165a48cc
      https://github.com/llvm/llvm-project/commit/d3afa171ee236dfef4b7cd4b4dd0b0fb165a48cc
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-02-11 (Wed, 11 Feb 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/X86/cost-model.ll

  Log Message:
  -----------
  [LV] Don't scalarize loads that need predication in legacy CM.

The legacy cost model tries to scalarize loads that are used as
pointers. Skip if the load would need predicating when scalarized,
because that would incur very high costs, see useEmulatedMaskMemRefHack.

Fixes https://github.com/llvm/llvm-project/issues/180780.



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