[LLVMdev] Qs on building LLVM passes

[Bill Wendling]

On Jan 17, 2009, at 10:27 PM, Keun Soo Yim wrote:

> 3.       In code generator, how can we add new instruction in a way  
> that back-end consider
> this added instruction for its instruction scheduling and register  
> allocation?
>
You will want to add this in the appropriate .td file. The .td files  
are full of "recipes" which match nodes in the DAG. The appropriate  
instruction is selected from those recipes that match a pattern in the  
DAG.

-bw