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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] Tiny matrix in Eigen2
- From: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>
- Date: Thu, 17 Sep 2009 09:19:22 -0400
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2009/9/17 <grey_earl@xxxxxx>:
>> On Thu, Sep 17, 2009 at 2:03 PM, WANG Xuewen <xuewen.wang@xxxxxxxxx> wrote:
>> > Hi,
>> >
> -- snip --
>> >
>> > typedef Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic,
>> > Eigen::RowMajor | Eigen::DontAlign,
>> > NMaxTinyMatrixDimension, NMaxTinyMatrixDimension>
>> > TinyRMatrix;
>> >
>
> You should definitely not use Eigen::DontAlign as this disables alignment in memory allocation which is necessary for SSE operations. Try without and use gcc switches -mfpmath=sse -O3 if you use gcc.
He won't get any vectorization anyway because the max-size is what
matters here, and being fixed at compile time, it should be a multiple
of 16 to allow vectorization. 7*7*8 isn't a multiple of 16, so no
vectorization.
Benoit