[LLVMdev] Making a CopyToReg/CopyFromReg into a zext/sext? (original) (raw)

Matt Arsenault Matthew.Arsenault at amd.com
Tue Jan 27 12:22:09 PST 2015

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

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