Re: [PATCH] Auto vectorize cond expr (remaining patches)

[Devang Patel <dpatel at apple dot com>]

On Apr 9, 2005, at 3:15 PM, Devang Patel wrote:

> > > This patch adds support to 1) vectorize conditional
> > > expressions (using vec_cond_optab). 2) It also adds support to check
> > > dependence distance wrt vectorization factor. This work was
> > > presented in two different patches in sept. (along with 4 other
> > > patches but these two missed GCC 4.0 train.). This patches are
> > > used in autovect-branch and apple-ppc-branch since last 6 months.
> >
> > I found one of these, I think,
> >
> >   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02889.html
> >
> > but not the other, and even the one basically has no commentary
> > on what you're trying to do.
>
> Yes, this message is the last in this thread. The basic idea is  
> simple.
> If dependence distance is more than vectorization factor then it
> does not prevent vectorization. If dependence distance is zero then
> also it does not hurt vectorization.
>
> Another is at
>
>     http://gcc.gnu.org/ml/gcc-patches/2004-09/msg01768.html
>
> and it has some info and pointers to other messages. I included
> dependence vector patch together because now it is very small
> thanks to other changes in vectorizer.
>
> > I definitely want them split back into separate patches.

Here is the patch for distance vector only. I will CC you when
I send separate patch for vector conditions.


2005-04-11  Devang Patel  <dpatel@apple.com>

        * tree-data-ref.c (build_classic_dist_vector,
        compute_subscript_distance): Make externally visible.
        * tree-data-ref.h (build_classic_dist_vector,
        compute_subscript_distance): Same.
        * tree-vect-analyze.c (vect_analyze_data_ref_dependence):
        Check distance vector against vectorization factor.
        (vect_analyze_loop): Determine vectorizaion factor before
        analyzing data dependences.
        * tree-vectorizer.c (loops_num): Make it externally visible and
        rename ...
        * tree-vectorizer.c (vect_loops_num): ... new name.
        * tree-vectorizer.h  (vect_loops_num): New.

        * gcc.dg/vect/vect-dv-1.c: New test.
        * gcc.dg/vect/vect-dv-2.c: New test.

-
Devang

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