[PATCH] D147264: [DAG] Add SelectionDAG::SplitScalar helper

[Simon Pilgrim via Phabricator via llvm-commits]

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Similar to the existing SelectionDAG::SplitVector helper, this helper creates the EXTRACT_ELEMENT nodes for the LO/HI halves of the scalar source.

There's still additional targets that can be converted to use this - my only concern is if its an issue that we mix it with cases where we call getNode(ISD::EXTRACT_ELEMENT) just for the HI half?


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147264

Files:
  llvm/include/llvm/CodeGen/SelectionDAG.h
  llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  llvm/lib/Target/AMDGPU/SIISelLowering.cpp
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/lib/Target/Mips/MipsSEISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/Sparc/SparcISelLowering.cpp
  llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp

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