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tree-ssa status (was: Re: Dropping of old loop optimizer)
Op do 27-02-2003, om 18:13 schreef Pop Sébastian:
> On Thu, Feb 27, 2003 at 05:39:17PM +0100, Zdenek Dvorak wrote:
> >
> > The problem I see is that rtl ssa is broken (or never worked?); but
> Last time I had a close look at rtl was about two years ago :-)
> Dan is the expert to ask about the status of SSA at rtl level (he adapted
> the CCP code from rtl to tree-ssa).
>
> > perhaps we could do this kind of optimizations just on trees (that
> > unfortunately also aren't ready for serious usage yet, right?)?
> >
> CCP (Conditional constant propagation) and
> DCE (Dead code elimination)
> seem to work fine on tree-SSA.
There is a difference between things that "work fine" and things that
"are ready".
What, for example, is the compile time performance on the branch? SPEC
results compared to mainline? If I correctly interpret Diego's SPEC
tester results, it does not quite look like it's there yet.
Diego, you suggested last month that you would like to merge the branch
in the near feature (on the gomp list IIRC). What are the show stoppers
you know about, other than that it will not be ready before stage1
ends? There branch has moved so fast over the last two months that a
status update would be nice...
(I can send you a patch to update the web page iyl. It still claims
you're using FUD chains :-)
Greetz
Steven