[all-commits] [llvm/llvm-project] 8c0f52: [DAG] Fold extract_subvector(insert_subvector(x, y, ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8c0f52e9d5a99bf96bb64ac23b5893482c292527
      https://github.com/llvm/llvm-project/commit/8c0f52e9d5a99bf96bb64ac23b5893482c292527
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-04-12 (Fri, 12 Apr 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/X86/any_extend_vector_inreg_of_broadcast.ll
    M llvm/test/CodeGen/X86/dpbusd.ll
    M llvm/test/CodeGen/X86/dpbusd_i4.ll
    M llvm/test/CodeGen/X86/vector-interleaved-load-i16-stride-3.ll
    M llvm/test/CodeGen/X86/vector-interleaved-store-i8-stride-7.ll
    M llvm/test/CodeGen/X86/zero_extend_vector_inreg_of_broadcast.ll

  Log Message:
  -----------
  [DAG] Fold extract_subvector(insert_subvector(x,y,c1),c2) --> extract_subvector(y,c2-c1) (#87925)

If the extract_subvector is cheap, attempt to extract directly from an inserted subvector



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