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Re: [tree-ssa] Eliminating unnecessary variables during out-of-ssa
- From: Andrew MacLeod <amacleod at redhat dot com>
- To: Daniel Berlin <dberlin at dberlin dot org>
- Cc: gcc mailing list <gcc at gcc dot gnu dot org>
- Date: 12 May 2003 15:47:44 -0400
- Subject: Re: [tree-ssa] Eliminating unnecessary variables during out-of-ssa
- References: <D8BDD110-84B1-11D7-9010-000A95A34564@dberlin.org>
On Mon, 2003-05-12 at 15:42, Daniel Berlin wrote:
>
> On Monday, May 12, 2003, at 02:54 PM, Andrew MacLeod wrote:
>
> >
> > Of course you need them for those optimizations, otherwise we wouldn't
> > generate them in the first place.
> >
> :P
> > After we go out of SSA form, we no longer have an SSA form, so no one
> > needs these things. All PHI nodes are deleted as part of the process.
> >
> You said "Can anyone thing of when we might actually need any of these
> variables
> in the rewriting stage?"
> I was confused, because i usually think of the rewriting stage as
> into-ssa, not out-of-ssa.
> >
>
:-). Sorry, I was originally going to attach the note to my out-of-ssa
status note, but decided it was long enough and made it a seperate note.
I just carried forward the same thoughts forward, so I can see how it
might be missing some information :-).
Sorry for the confusion.
Andrew