From: Paul Baxter (pauljbaxter_at_[hidden])
Date: 2005-03-14 17:34:38
Am Montag, 14. März 2005 04:47 schrieb Tony Juricic:
>> Are there any SIMD (Altivec or SSE2) implementations considered in
>> UBLAS and new MTL projects?
>There is no explicit SIMD support, because uBLAS only consists of header
>files. Your compiler decides wheter it uses SSE2 or not.
I can recommend the fledgeling MacSTL library at www.pixelglow.com as a
basis for providing cross-platform (Intel/Altivec) SIMD support though its
license is not quite as flexible as Boost. (I think of it as 'author's gotta
eat'-ware). Got a long way to go to be integrated with the likes of ublas
though.
The PC side of things is not as mature as the Altivec, but Glen Low is
working on it.
Whether he has any interest in extending things to ublas/MTL3 I don't know.
Personally, I can't help feeling a combination of expression templates and
SIMD instructions could be good for performance.
My initial comparisons of his valarray implementation against IPP/MKL-BLAS
and standard library alternatives were encouraging albeit currently there is
only limited type support on the PC.
I didn't bench ublas as my application is about manipulating 2D images so
seems a better fit with image-processing style requirements.