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

[Ryan Taylor]

Thanks for getting back to me.

So those nodes record if the type has already been expanded from a narrower
type. Can you elaborate how I could use these to help? Again, I'm pretty
unfamiliar with the SDNodes.

Thanks.

On Tue, Jan 27, 2015 at 3:22 PM, Matt Arsenault <Matthew.Arsenault at amd.com>
wrote:

>  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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