Fwd: Questions about Vc

[Matthias Kretz]

Hi,

just a quick answer to let you know that I have some high priority work to do 
the next two weeks...

IIUC your code vectorizes inside each object (vertical vectorization) not over 
multiple objects (horizontal vectorization), right. In my experience vertical 
vectorization requires shuffles, horizontal vectorization doesn't.
At this point Vc is much better suited for horizontal vectorization...

Once you do vertical vectorization you rely on the number of entries in the 
SIMD register anyway and would be better of with something like 
Vc::simdarray<float, 4> instead of Vc::float_v. With Vc::simdarray a shuffle 
API will be much easier to define, because the number of entries is portable 
for a given type.

-Matthias

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 Dipl.-Phys. Matthias Kretz

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 SIMD easy and portable: http://compeng.uni-frankfurt.de/?vc
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