Re: [boost] Boost SIMD beta release

Subject: Re: [boost] Boost SIMD beta release
From: Dave Abrahams (dave_at_[hidden])
Date: 2012-12-20 20:14:50

on Thu Dec 20 2012, "Peter Dimov" <lists-AT-pdimov.com> wrote:

> You can build three inputs over two (but not over one):
>
>    d = s + s2 + s3;
>
> becomes
>
>    d = s + s2;
>    d = d + s3;
>
> It's not exactly the same, performance-wise, but the point is that two
> inputs are a necessary primitive, and three inputs are an
> optimization. 

Unless you can zip, in which case only one input is needed.  Most
languages only have the one-sequence version of "map"
(a.k.a. transform).

-- 
Dave Abrahams
BoostPro Computing                  Software Development        Training
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