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Re: [tree-ssa] RFC: Making control flow more explicit
On Mon, 11 Aug 2003, Diego Novillo wrote:
> On Mon, 2003-08-11 at 16:04, Zdenek Dvorak wrote:
>
> > I am not really sure what is the exact meaning of the parent. Can't you
> > run into problems in cases like
> >
>
> > Anyway, losing concept of parent relationship seems to be relatively
> > small cost in comparison to other gains.
> >
> The only reason why we use the parent relation is to avoid spending time
> building the control dependence information. That can be costly. IIRC,
> Jeff Law had done some experiments with that, but they don't seem to be
> in CVS.
It depends how you do it.
If we do it building APT, it would be relatively quick, and we could get
linear time phi placement as a result.
>
>
> Diego.
>
>