vectorizer data dependency graph

[Daniel Berlin]

On 11/14/06, Sashan Govender <sashang@gmail.com> wrote:
> Hi
>
> I was looking at the vectorizer
> (http://gcc.gnu.org/projects/tree-ssa/vectorization.html) and noticed
> that in section 6 it says that there is no data dependence graph
> implemented. Also had a search throught the mailing list archives and
> noticed that although ddg.c exists its not used much?
> (http://gcc.gnu.org/ml/gcc/2005-09/msg00661.html). A grep for
> creat_ddg shows it's used in modulo-sched.c. So is this fertile ground
> for something to be implemented? Is it worth implementing a ddg graph
> for the vectorizer?

What exactly do you hope to gain by building a ddg?
If you have some algorithm that can take advantage of a ddg, sure, build one.

>
> Thanks
>