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Re: [Autovect]dependencies of virtual defs/uses
- From: Dorit Nuzman <DORIT at il dot ibm dot com>
- To: jiahua at gmail dot com
- Cc: "Daniel Berlin" <dberlin at dberlin dot org>, gcc at gnu dot org
- Date: Mon, 12 Feb 2007 22:28:13 +0200
- Subject: Re: [Autovect]dependencies of virtual defs/uses
> Thanks! In fact, I should ask how to deal with idiom (such as
> reduction, induction) recognition for virtual defs/uses.
>
Just curious - what is this for? (are you interested in this in the context
of vectorization? is there a specific example you have in mind?)
dorit
> Jiahua
>
>
> 2007/2/12, Daniel Berlin <dberlin@dberlin.org>:
> > On 2/12/07, Jiahua He <jiahua_he@ustc.edu> wrote:
> > > Hi,
> > >
> > > I am reading the code of autovect branch and curious about how to
deal
> > > with the dependencies of virtual defs/uses. In the function
> > > vect_analyze_scalar_cycles( ), I found the statement "Skip virtual
> > > phi's. The data dependences that are associated with virtual
defs/uses
> > > ( i.e., memory accesses) are analyzed elsewhere." But where is the
> > > code? I tried to search for "vect_induction_def" and
> > > "vect_reduction_def" and found that they are not used to assign
> > > elsewhere. Is the analysis not implemented yet? Thanks in advance!
> >
> > They show up as data references because of tree-data-reference.c
> marking them.
> > At lets, that's how other linear loop transforms handles it.
> > Not sure about how vectorizer deals with it specifically
> >
> > >
> > > Jiahua
> > >
> >