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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] Issues regarding Quaternion-alignment and const Maps
- From: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>
- Date: Fri, 9 Jul 2010 18:03:53 -0400
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2010/7/9 Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>:
> Benoit Jacob wrote:
>>
>> Wow, very good work.
>>
>> I indeed confirm the 2x speed improvement, and once i moved your
>> benchmarking code to a non-inlinable function called from main(), it
>> even got a bit higher (indeed GCC fails to optimize correctly code in
>> the main() function).
>>
>> Could you make a patch against the development branch? (We're not
>> going to add features to 2.0 at this point).
>
> I think I can do that, but most likely not before Monday/Tuesday.
>
>>
>> http://eigen.tuxfamily.org/index.php?title=Developer%27s_Corner#Generating_a_patch
>>
>> Also, I didn't know about that loaddup instruction in SSE3. It's
>> great! I'll have a look at using it in ei_pset1 when SSE3 is
>> available.
>
> It's actually a pity that there is no complete list with *just* all
> SSE-instructions (not mixed with every other x86-instruction), including a
> short description, maybe a usage example, and intrinsics for some common
> compilers. At least I did't find any ...
Yes, I've been trying to see if there is a single-precision equivalent
for MOVDDUP and I still don't know...
Benoit
>
>
> --
> ----------------------------------------------
> Dipl.-Inf. Christoph Hertzberg
> Cartesium 0.051
> Universität Bremen
> Enrique-Schmidt-Straße 5
> 28359 Bremen
>
> Tel: (+49) 421-218-64252
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