llvm dev - Mar 2019 - Is there any progress on cross-call scheduling?

Hi there,

I noticed that until now LLVM doesn’t have support for cross-call
instruction scheduling (see `isSchedBoundary` at
`lib/CodeGen/MachineScheduler.cpp`).

I’m now an internship student on C++ compiler (powered by LLVM) and I’m
planning to take it as my graduation project. Would this be a
too-large-to-finish task, or it doesn’t have much potential performance
improvement? Thanks.

Regards,

Qiu Chaofan
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