[all-commits] [llvm/llvm-project] b74176: [AArch64][SelectionDAG] Generate clastb for extrac...

[Graham Hunter via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b74176a3a26ae26b8671bcf3cc261353c23c88d0
      https://github.com/llvm/llvm-project/commit/b74176a3a26ae26b8671bcf3cc261353c23c88d0
  Author: Graham Hunter <graham.hunter at arm.com>
  Date:   2025-02-06 (Thu, 06 Feb 2025)

  Changed paths:
    M llvm/include/llvm/Target/TargetSelectionDAG.td
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
    M llvm/test/CodeGen/AArch64/vector-extract-last-active.ll

  Log Message:
  -----------
  [AArch64][SelectionDAG] Generate clastb for extract.last.active (#112738)

This patch improves SVE codegen for the vector extract last active
intrinsic, using either the lastb instruction (if the passthru value was
poison or undef), or the clastb instruction.



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