| Re: [eigen] Re: vectorization for ints not working |
[ Thread Index |
Date Index
| More lists.tuxfamily.org/eigen Archives
]
- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] Re: vectorization for ints not working
- From: Rohit Garg <rpg.314@xxxxxxxxx>
- Date: Sun, 13 Sep 2009 13:01:41 +0530
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=soPMEXVyYhUvVj45I6SqcmWj+/0ESj6P5evacH2PAs4=; b=j5E7GtwqnnGLcMfZK5LcSfb57P0h3iPjIDAi9K6woyYzwb318x69mwCPUHlsNG8afk 49tSd3d0g4t5k+UJlEQLoW9KjF7/CY+sbK/BcFoBIPZKmVSHgnDzAUi35E89DNtFfqO1 9ElYKg7uwSwz5ZMfqW2vX4qTZDeeOLoD2g2OY=
- Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=Xc9g5ChT+oPOIaK1OSXIjG+C/bq17zDGE1iz/FzUxdihsU57goOx3xmJderPx1diu/ 1uJ4U8A803G4UxA+cJkNS0B5O98S7UpchHSAYPReUc5y8VPM+RpERqylUjAc9GHLf52Q 2a/mouxLZe4MLSRv7YmdX/oXAedYI7+bgMI/Y=
I used the reinterpret_cast<> trick mentioned here by Benoit
http://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/2009/09/msg00117.html
And got vectorization working.
Thanks to Benoit for mentioning this. Though I'd prefer if the Map
object did this. It's safer. and less kludgy.
On Sat, Sep 12, 2009 at 2:57 PM, Rohit Garg <rpg.314@xxxxxxxxx> wrote:
> On Sat, Sep 12, 2009 at 1:31 PM, Gael Guennebaud
> <gael.guennebaud@xxxxxxxxx> wrote:
>> yes this is because I did not expect such kind of use of Map for small
>> fixed size vectors. Actually why don't you use an Eigen vector for
>> "bytes" ? Then you won't need to use Map.
>
> Ok, I checked it out. It will not be possible to pass in an eigen vector.
>>
>> Anyway, to make Map more usable what we have to do is to add a
>> FirstAligned option to Map so that Eigen knows your data is
>> aligned.... The ForceAlign option has a different meaning.
> I think doing this is a better idea.
>>
>> cheers,
>> gael.
>>
>> On Sat, Sep 12, 2009 at 8:24 AM, Rohit Garg <rpg.314@xxxxxxxxx> wrote:
>>> PS: this is eigen's unstable branch, but using code checked out a
>>> month or so ago.
>>>
>>> On Sat, Sep 12, 2009 at 11:50 AM, Rohit Garg <rpg.314@xxxxxxxxx> wrote:
>>>> I had a simple piece of code involving matrix4i, and it is not
>>>> compiling with vectorization. This is on fedora 11, 64 bit, gcc 4.4.1.
>>>> To compile, use make eigen. I am interested in vectorization of the
>>>> code in the addressesGen function, which enclosed in asm directives.
>>>> There are clear signs of eigen unrolling the loop, but I'd like my
>>>> vectorization please. :)
>>>>
>>>> To compile, do make eigen.
>>>>
>>>> --
>>>> Rohit Garg
>>>>
>>>> http://rpg-314.blogspot.com/
>>>>
>>>> Senior Undergraduate
>>>> Department of Physics
>>>> Indian Institute of Technology
>>>> Bombay
>>>>
>>>
>>>
>>>
>>> --
>>> Rohit Garg
>>>
>>> http://rpg-314.blogspot.com/
>>>
>>> Senior Undergraduate
>>> Department of Physics
>>> Indian Institute of Technology
>>> Bombay
>>>
>>>
>>>
>>
>>
>>
>
>
>
> --
> Rohit Garg
>
> http://rpg-314.blogspot.com/
>
> Senior Undergraduate
> Department of Physics
> Indian Institute of Technology
> Bombay
>
--
Rohit Garg
http://rpg-314.blogspot.com/
Senior Undergraduate
Department of Physics
Indian Institute of Technology
Bombay