[all-commits] [llvm/llvm-project] e25db2: [CostModel] getInstructionCost - match SK_InsertSu...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e25db2f6b30d805ef9095a3c72ab0618f4f3bef9
      https://github.com/llvm/llvm-project/commit/e25db2f6b30d805ef9095a3c72ab0618f4f3bef9
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-06-26 (Thu, 26 Jun 2025)

  Changed paths:
    M llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
    M llvm/test/Analysis/CostModel/AArch64/shuffle-other.ll
    M llvm/test/Analysis/CostModel/AMDGPU/shufflevector.ll
    M llvm/test/Analysis/CostModel/ARM/shuffle.ll
    M llvm/test/Analysis/CostModel/RISCV/shuffle-exact-vlen.ll
    M llvm/test/Analysis/CostModel/RISCV/shuffle-insert_subvector.ll
    M llvm/test/Analysis/CostModel/RISCV/shuffle-select.ll
    M llvm/test/Analysis/CostModel/X86/alternate-shuffle-cost.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-insert_subvector.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-select.ll
    M llvm/test/Transforms/PhaseOrdering/X86/hadd.ll
    M llvm/test/Transforms/PhaseOrdering/X86/hsub.ll

  Log Message:
  -----------
  [CostModel] getInstructionCost - match SK_InsertSubvector shuffle patterns before SK_Select (#145920)

More closely match improveShuffleKindFromMask's shuffle ordering by
trying to match a SK_InsertSubvector shuffles patterns before SK_Select
- both can match many of the same patterns, but its much easier to
recognise when a SK_InsertSubvector can be converted to SK_Select than
vice-versa.

Another step towards #145335 - which I'm hoping will allow us to
generalise improveShuffleKindFromMask and remove getInstructionCost's
shuffle matching entirely.



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