[llvm-dev] Target DAG-combine vs. Target custom lowering

[Servius Womack via llvm-dev]

Hi,

I am new to LLVM. I read the the Codegen documentation, and browsed thru
the code of some of the backends. One thing i didn't understand was when
should a transformation happen in the TargetLowering::PerformDAGCombine and
not in the custom lowering phase.

Thanks, Servius
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