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Hi, all I am studying the ARM backend on SelectionDAG, I have some following questions: 1. Each operator of SDNode in SelectionDAG is required to be defined by SDNode<ISD::XXX,XXX,XXX> in .td file, right? But several operators are not defined in .td file, why? (e.g., ISD::BR_CC, ISD::CopyToReg, ISD::AssertSext) 2. The MVT::glue value is used to ensure two nodes are scheduled