Re: [eigen] vectorization of complex

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On 20/07/10 16:01, Gael Guennebaud wrote:
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....

NT2 use 2x array for complex matrix (and for any non scalar type in fact) and it significantly simplify the vectorization process. What was the blames for doing so ?

Also note all LAPACK thingy use this format.

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