llvm dev - Jul 2021 - Question about Instruction Schedule

Hello,

	Recently, I am reading the code of Instruction schedule in llvm.
        But it is confused me, because I found llvm have two classes named
ScheduleDAGSDNodes and ScheuleDAGInstrs. The first one is used for scheduling
SDNode-based DAG, the other is used for MachineInst.
	But could we use ScheuleDAGInstrs directly?

       Thanks in advance.

Best Regards
dongAxis
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