[PD-dev] gcc 4.1 and auto-vectorization

[Tim Blechmann]

On Sat, 2006-11-18 at 23:00 -0500, Hans-Christoph Steiner wrote:
> On Nov 18, 2006, at 8:07 PM, Thomas Grill wrote:
> 
> >
> > Am 18.11.2006 um 22:16 schrieb Mathieu Bouchard:
> >
> >> On Sat, 18 Nov 2006, Hans-Christoph Steiner wrote:
> >>
> >>> I really doubt that the gcc devs put a lot of effort into  
> >>> something that has no effect. Perhaps not for Pd, that may be  
> >>> true.  But they are talking about vectorizing loops, it may not  
> >>> be the best thing to vectorize, but there are definitely  
> >>> vectorizable loops in Pd.
> >>
> >> perhaps it would be a good start to reimplement newbytes(n) using  
> >> memalign(16,n) instead of malloc(n).
> >
> > A few years ago i introduced aligned memory allocation in the pd- 
> > devel branch.
> 
> Have you tried submitting a patch?  It would be at least useful in Pd- 
> extended.  How big a difference did it make?

what makes you think, that just aligning memory regions introduces a
performance boost?
how can a compiler generate code for aligned memory, if the memory is
aligned, but the compiler isn't aware of that?

tim

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