[LLVMdev] Register based vector insert/extract

[Chris Lattner]

On Mon, 23 Apr 2007, Christopher Lamb wrote:
> How can one let the back end know how to insert and extract elements of 
> a vector through sub-register copies? I'm at a loss how to do this...

You probably want to custom lower the insertelement/extractelement 
operations for the cases you support.  Take a look at 
X86TargetLowering::LowerEXTRACT_VECTOR_ELT for some examples of how to do 
this.

-Chris

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