[all-commits] [llvm/llvm-project] 952670: [RISCV][GlobalISel] Add G_CLMULH support (#221686)

[Jian Li via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 95267015df795c02d829b3545610a5f5e95609e8
      https://github.com/llvm/llvm-project/commit/95267015df795c02d829b3545610a5f5e95609e8
  Author: Jian Li <hellothedreamer at 126.com>
  Date:   2026-09-11 (Fri, 11 Sep 2026)

  Changed paths:
    M llvm/docs/GlobalISel/GenericOpcode.md
    M llvm/include/llvm/Support/TargetOpcodes.def
    M llvm/include/llvm/Target/GenericOpcodes.td
    M llvm/include/llvm/Target/GlobalISel/SelectionDAGCompat.td
    M llvm/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir
    M llvm/test/CodeGen/RISCV/GlobalISel/clmul-rv32.ll
    M llvm/test/CodeGen/RISCV/GlobalISel/clmul-rv64.ll
    M llvm/test/CodeGen/RISCV/GlobalISel/legalizer-info-validation.mir
    M llvm/test/TableGen/get-named-operand-idx.td

  Log Message:
  -----------
  [RISCV][GlobalISel] Add G_CLMULH support (#221686)

Add G_CLMULH to represent the high half of a carry-less multiplication
in generic Machine IR.

Translate llvm.riscv.clmulh to G_CLMULH and mark it legal for native
XLEN scalar types when Zbkc is available. Reuse the existing
SelectionDAG pattern to select the RISC-V CLMULH instruction.



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