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Re: -ftree-vectorize can't vectorize plus?
- From: Andrew Pinski <pinskia at physics dot uc dot edu>
- To: devang dot patel at gmail dot com (Devang Patel)
- Cc: DORIT at il dot ibm dot com (Dorit Nuzman), gcc at gcc dot gnu dot org (GCC Development)
- Date: Thu, 21 Sep 2006 16:40:48 -0400 (EDT)
- Subject: Re: -ftree-vectorize can't vectorize plus?
>
> Hi,
>
> On 9/16/06, Dorit Nuzman <DORIT@il.ibm.com> wrote: .
>
> >so the stuff in tree-ssa-forwprop:eliminate_unnecessary_casts in
> > autovect-branch is supposed to go under this tree-combiner pass as well, or
> >do you plan to merge it to mainline some time?
>
>
> tree-ssa-forwprop:eliminate_unncessary_casts approach is
> considered not appropriate for mainline (because
> tree-combiner will take care of it.) so I do not plan to merge
> it to mainline. I discussed this with tree-ssa folks when we
> were chasing gzip performance. They preferred to wait for
> tree-combiner instead of gaining gzip performance improvement
> using this short term approach.
The Tree combiner is semi dead as I have other work to do now. But I hear
PRE is able to do some stuff like this (and already does for some simple testcases).
-- Pinski