[Bug tree-optimization/48172] [4.5/4.6/4.7 Regression] incorrect vectorization of loop in GCC 4.5.* with -O3

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48172

--- Comment #11 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-12 12:38:15 UTC ---
(In reply to comment #9)
> (In reply to comment #8)
> > Created attachment 24236 [details]
> > patch
> > 
> > Patch I'm going to test.
> 
> So, segment_length = scalar_step * vf * scalar_niters?
> I think we don't need vf here.

Hm, right.  I'll prepare a followup.

> Also, why not do that only for different steps?

We don't know this at this point.  Maybe we can change the structure
of the code somewhat.  I'll have a look.

> Thanks,
> Ira