llvm dev - Oct 2010 - [LLVMdev] [Noob] Docs for SelectionDAGs?

Hi all,

Just getting started with LLVM, and trying to write a back end for a toy
hypothetical processor. I'm using llvm-gcc with -emit-llvm to see the LLVM
code. The LLVM code is very well-documented at
http://llvm.org/docs/LangRef.html. However, I'm looking for equivalent
documentation for SelectionDAGs. As I understand it, instructions in the target
specification get matched against the SelectionDAGs, not against the LLVM code.
So where do I go to ensure that I'm correctly defining everything that needs
to be defined?

Thanks,

--Rob

On Thu, Oct 21, 2010 at 12:05 PM, Robert Baruch
<autophile at zoominternet.net> wrote:
> Hi all,
>
> Just getting started with LLVM, and trying to write a back end for a toy
hypothetical processor. I'm using llvm-gcc with -emit-llvm to see the LLVM
code. The LLVM code is very well-documented at
http://llvm.org/docs/LangRef.html. However, I'm looking for equivalent
documentation for SelectionDAGs. As I understand it, instructions in the target
specification get matched against the SelectionDAGs, not against the LLVM code.
So where do I go to ensure that I'm correctly defining everything that needs
to be defined?
http://llvm.org/docs/CodeGenerator.html#selectiondag_intro should be
enough to get you started.

-Eli