[LLVMdev] TableGen For Loops

David A. Greene dag at cray.com
Thu Oct 6 10:25:32 PDT 2011

greened at obbligato.org (David A. Greene) writes:

> So here's why I think the for loop proposal can't be a preprocessing
> phase.  Down in the guts of this I fundamentally need to be able to do
> this:
> multiclass blah<list<int> Values> {
>   for v = Values {
>     def DEF#v : base_class<v>;
>   }
> }
> Will that work?  Is the for loop evaluated after parameter binding?

I think I can actually make this work using the existing multidef
feature code.  The ideas are fundamentally the same.  I do like the
for syntax a lot better.

Che-Liang, would you mind if I played around with changing the multidef
parsing to recognize your for syntax?  Your code will work in places
that multidefs can't right now (as Jakob noted) and we want to retain
that ability.  I would be working on integrating for loops into TableGen
proper, not as a preprocessor.


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