[all-commits] [llvm/llvm-project] d8e679: [CostModel][X86] getShuffleCost - SK_Transpose v4f...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d8e679c28650082a97675c8edeaa01fac3e695c1
      https://github.com/llvm/llvm-project/commit/d8e679c28650082a97675c8edeaa01fac3e695c1
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2026-02-09 (Mon, 09 Feb 2026)

  Changed paths:
    M llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/X86/shuffle-transpose.ll
    M llvm/test/Transforms/VectorCombine/X86/shuffle-of-shuffles.ll

  Log Message:
  -----------
  [CostModel][X86] getShuffleCost - SK_Transpose v4f64/v4i64 matches UNPCK - don't generalise to SK_PermuteTwoSrc (#180514)

Other SK_Transpose shuffles can be cheaper than SK_PermuteTwoSrc but this is the easy one to handle

Fixes #161980



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