Re: [boost] Boost SIMD beta release

Subject: Re: [boost] Boost SIMD beta release
From: Dave Abrahams (dave_at_[hidden])
Date: 2012-12-20 13:42:31

on Thu Dec 20 2012, Mathias Gaunard <mathias.gaunard-AT-ens-lyon.org> wrote:

> On 20/12/12 19:12, Dave Abrahams wrote:
>>
>> on Thu Dec 20 2012, Joel Falcou <joel.falcou-AT-gmail.com> wrote:
>>
>>
>>> Maybe we should have a simd::unaligned_input_iterator and/or make
>>> simd::transform accept non aligned data. Note that on any pre-Nehalem
>>> CPU, the unaligned load will be horrendsously slow.
>>
>> It's probably a bit late to bring this up, but did you consider a design
>> that uses something like Matt Austern's segmented iterator concept
>> (http://lafstern.org/matt/segmented.pdf) and imposes a hierarchical view
>> over regular memory that segments on aligned memory regions?
>
> The code needs to be the same for all segments in that model, unless
> I've missed something.

I don't understand exactly what you mean, nor what problem you see with
that model.

-- 
Dave Abrahams
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