[PD-dev] gcc 4.1 and auto-vectorization

[Tim Blechmann]

On Fri, 2006-11-17 at 09:10 -0500, Hans-Christoph Steiner wrote: 
> On Nov 17, 2006, at 7:01 AM, Tim Blechmann wrote:
> 
> > On Thu, 2006-11-16 at 16:28 -0500, Hans-Christoph Steiner wrote:
> >> Debian/testing now uses gcc 4.1 as its default compiler.  I just
> >> noticed when doing the apt-get upgrades.  Has anyone tried the auto-
> >> vectorization stuff?  Is it worthwhile with Pd?
> >
> > you might want to check the archives:
> > http://lists.puredata.info/pipermail/pd-dev/2006-08/007324.html
> >
> > to explain the terms 'alignment' and 'aliasing':
> >
> > alignment:
> > audio blocks are not known to be aligned to 16byte boundaries
> >
> > aliasing:
> > for functions in the form foo(t_sample * a, t_sample * b, int n), the
> > compiler is unable to know if the memory regions of a and b are
> > overlapping (b may be a+1)
> 
> Right, I remember that, I was meaning more has anyone tried any  
> benchmarks.

i must admit, but i'm a bit confused ...
how can an auto-vectorizer, that's known not to have any effect for a
piece of code improve it's performance?

tim

--
tim at klingt.org    ICQ: 96771783
http://www.mokabar.tk

Beware of bugs in the above code; I have only proved it correct, not tried it.
  Donald Knuth
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