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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] vectorization of complex
- From: Gael Guennebaud <gael.guennebaud@xxxxxxxxx>
- Date: Tue, 20 Jul 2010 16:01:03 +0200
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On Tue, Jul 20, 2010 at 2:38 PM, FMDSPAM <fmdspam@xxxxxxxxx> wrote:
> Am 20.07.2010 11:47, schrieb Gael Guennebaud:
>>
>> [...] but 3 swizzling and one "bitwise or" operation to negate
>> some coefficients. This make it far to be optimal. In particular
>> swizzling is extremely costly. Moreover all these "complex" operations
>> requires many additional registers to store the temporaries. [...]
>
> In another threat matlab was "blamed" to use separate matrices for real and
> imaginary parts instead of one matrix of complex coeff.
> How do you think, this would compete?
Good point, with such an approach it is straightforward to support
complex-complex and mixing types on top of a real-real matrix product
with good performance I guess....
gael
>
> --Frank
>
>
>
>