[all-commits] [llvm/llvm-project] d9f165: [SDAG] Add an ISD node to help lower vector.extrac...

[Graham Hunter via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d9f165ddea3223217a959c3cea3d2c613b132935
      https://github.com/llvm/llvm-project/commit/d9f165ddea3223217a959c3cea3d2c613b132935
  Author: Graham Hunter <graham.hunter at arm.com>
  Date:   2025-01-20 (Mon, 20 Jan 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/ISDOpcodes.h
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
    M llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/lib/CodeGen/TargetLoweringBase.cpp
    M llvm/test/CodeGen/AArch64/vector-extract-last-active.ll
    M llvm/test/CodeGen/RISCV/rvv/vector-extract-last-active.ll

  Log Message:
  -----------
  [SDAG] Add an ISD node to help lower vector.extract.last.active (#118810)

Based on feedback from the clastb codegen PR, I'm refactoring basic codegen for the vector.extract.last.active intrinsic to lower to an ISD node in SelectionDAGBuilder then expand in LegalizeVectorOps, instead of doing everything in the builder.

The new ISD node (vector_find_last_active) only covers finding the index of the last active element of the mask, and extracting the element + handling passthru is left to existing ISD nodes.



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