Scheduler:LLVM vs gcc, which is better

[lin zuojian]

Hi,
    I read LLVM code for a while,and a question raise:Whose scheduler is
    better?
    LLVM brings in the DAG,and make it look important just like IR or
    MachineInst.But is that necessary?I don't see what kind of problem
    it tries to solve.
    From the pipeline of the compiler, LLVM can not do sched2.Is that
    suck?

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Regards
lin zuojian.