[llvm-dev] [MachineScheduler] Skip empty scheduling regions

[Yan Luo via llvm-dev]

Hello Dev,

I have a question about empty scheduling region. Currently we compare the iterators to
see if there is zero or only one schedulable instruction in the current region. Why don't
we use NumRegionInstrs instead? Consider a scenario: there is only one real instruction
in the current region but several debug instructions before it.



Thanks,
Yan
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