[llvm-dev] Manipulating DAGs in TableGen

[Madhur Amilkanthwar via llvm-dev]

Yeah, this is definitely useful in my experience. I had the same idea a few
days ago but it sidetracked in my ToDos.

IMHO, it is considerable effort though.

On Fri, Oct 9, 2020, 11:38 PM Paul C. Anagnostopoulos via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> I was wondering today whether the TableGen DAG support would be more
> useful if you could manipulate DAGs a little more easily. Right now, you
> can:
>
> * Specify a DAG with (...)
>
> * Catenate DAGs with !con().
>
> * Construct a DAG with !dag().
>
> * Iterate over a DAG with !foreach().
>
> * Get and set the DAG operator with !getop() and !setop().
>
> What if you could also get and set a DAG's operands individually, by
> position or by $xxx name? Would that add enough power/convenience that you
> would build more interesting DAGs in TableGen, or is it just easier to do
> such building in the backends?
>
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