SMS scheduling

[Mostafa Hagog]

Richard Henderson <rth@redhat.com> wrote on 30/09/2004 10:42:14:

> On Thu, Sep 30, 2004 at 10:03:37AM +0200, Mostafa Hagog wrote:
> > For 4.0 SMS intra-loop memory dependencies are detected using
> > the alias.c (as in haifa-sched) for inter-loop memory dependencies
> > we are very conservative and assume that all memory accesses are
> > aliased.
>
> alias.c is flow insensative, and thus as conservative as you
> could want.  Why aren't you using it all the time?

The answer is within your question; flow insensitive.
In SMS we are interested in loop-carried dependancies
and this is not provided by alias.c.  One thought is to
propagate the dependency information from trees down to the
RTL (Sebastian Bob looked into this).  This is a long term
working item for SMS.

Mostafa.