[Numpy-discussion] Calling C code that assumes SIMD aligned data.

[Julian Taylor]

note that anything larger than 16 bytes alignment is unnecessary for 
simd purposes on current hardware (>= haswell). 16 byte is default 
malloc alignment on amd64.
And even on older ones (sandy bridge) the penalty is pretty minor.

On 05.05.2016 22:32, Charles R Harris wrote:
>
>
> On Thu, May 5, 2016 at 2:10 PM, Øystein Schønning-Johansen
> <oysteijo at gmail.com <mailto:oysteijo at gmail.com>> wrote:
>
>     Thanks for your answer, Francesc. Knowing that there is no numpy
>     solution saves the work of searching for this. I've not tried the
>     solution described at SO, but it looks like a real performance
>     killer. I'll rather try to override malloc with glibs malloc_hooks
>     or LD_PRELOAD tricks. Do you think that will do it? I'll try it and
>     report back.
>
>     Thanks,
>     -Øystein
>
>
> Might take a look at how numpy handles this in
> `numpy/core/src/umath/simd.inc.src`.
>
> <snip>
>
> Chuck
>
>
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