[LLVMdev] Making a CopyToReg/CopyFromReg into a zext/sext?

[Matt Arsenault]

On 01/27/2015 12:16 PM, Ryan Taylor wrote:
> 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.
>

It sounds to me like you are looking for the AssertSext / AssertZext nodes

-Matt
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