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I have a CopyToReg�that is copying from different size types, what's the best way to change that to a zext or sext node based on signed or unsigned?

I'm fairly unfamiliar with SelectionDAG process (outside of the docs on llvm website).

It seems like I should be able to insert a custom hook using the register class to identify the type, potentially in ISelDAGToDag.cpp or is there a better place for this to be done?

Thanks.