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Re: [autovect] [patch] and aliasing question







Diego Novillo <dnovillo@redhat.com> wrote on 26/05/2005 14:02:10:

> On Thu, May 26, 2005 at 12:21:24PM +0300, Ira Rosen wrote:
>
> > vect-77v.c (attached)
> > ib_16 doesn't have a TMT
> >
> Because it is never dereferenced.  We only create memory tags for
> dereferenced pointers.  The aliaser decides that it is
> pointless to compute aliasing information for a non-dereferenced
> pointer, because there are no loads/stores to the pointed-to
> memory.
>
> Is this a problem for your analysis?  Do you need points-to
> information for non-dereferenced pointers as well?

We get to ib_16 with our data-ref analysis for *D.1607_25:

  D.1607_25 = ib_16 + D.1606_24;
  D.1608_26 = *D.1607_25;

I guess in such cases, we can get the tag from the original reference.

Thanks,
Ira


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