df.c data reprezentation

[Jan Hubicka]

> I know I was, and others were, specifically planning on reusing the df 
> module for dataflow on trees.
> Right now, it only requires assigning each variable an id (trivial), and 
> adding routines that know how to record defs/uses for trees.
Hmm, that makes sense...
> 
> If you want to transform the info at the end of dataflow into stuff on 
> rtx, that's fine. But please don't make it do it in the actual routines, 
> or in the dataflow structures.
OK, I will keep it as it is - only I am concerned about is the array of per-insn records,
as those seems to be quite problematic in other cases, but lets keep it that way.



Honza
> 
> >Honza