[llvm-dev] Manipulating DAGs in TableGen

[Nicolai Hähnle via llvm-dev]

I generally like the proposal.

On Sat, Oct 17, 2020 at 2:05 PM Paul C. Anagnostopoulos via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> Now I'm second-guessing myself about the indexes used to access the operator and operands. All the C++ functions used to access the operands index them from 0, as expected. It seems foolish and confusing to index them from 1 in these bang operators.
>
> One option is to index the operator as -1 and the operands from 0.
>
> A second option is to remove the ability to index the operator and retain the !getop and !setop bangs for that purpose, possibly renamed to !getdagop and !setdagop.

That's a good thought. It seems like a good idea to be consistent with
how things look from a backend's perspective in C++, so separate
!get(dag)op and !set(dag)op seems slightly better. Just my opinion :)

Cheers,
Nicolai


>
> Opinions, please.
>
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