[PATCH] D110253: [SelectionDAG] Make WidenVecRes_EXTRACT_SUBVECTOR work for scalable vectors.

[Sander de Smalen via Phabricator via llvm-commits]

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The legalizer handles this by breaking up an EXTRACT_SUBVECTOR into
smaller parts, and combines those together, padding the result with
UNDEF vectors, e.g.

  nxv6i64 extract_subvector(nxv12i64, 6)
  <->
  nxv8i64 concat(
    nxv2i64 extract_subvector(nxv16i64, 6)
    nxv2i64 extract_subvector(nxv16i64, 8)
    nxv2i64 extract_subvector(nxv16i64, 10)
    nxv2i64 undef)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110253

Files:
  llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
  llvm/test/CodeGen/AArch64/sve-extract-scalable-vector.ll

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