Re: [eigen] about changeset 6eb14e380

[joel falcou <joel.falcou@xxxxxx>]

On 18/08/10 17:52, Benoit Jacob wrote:
> if yes, I wonder, because rows/cols are not too relevant to matrix 
> products and other blocked algorithms.
> hm, are you saying that you are aligning each row/col?
table are aligned globally, matrix are aligned on each leading dimension 
so we are sure each leading block is occupiyng full cache line alone.
Don't forget we openMPify every expression as long as our CT check told 
us it was useful and not only matrix stuff.

> ...and for the record, the other big reason: we want to be friendly to 
> linux distros wrt binary libraries using Eigen. if libfoo uses Eigen, 
> and you're a distro packager for x86, you want to ship only 1 package 
> for libfoo. You decide whether you build it with SSE/AVX/nothing. 
> Then  You're free to do so because ABI is independent on that. Then 
> app developers/packagers can link against libfoo regardless of how 
> libfoo was built and regardless of their own simd settings. This is 
> basically a requirement in environments, like linux distros, which 
> rely heavily on system-wide shared libraries (rather than app bundles).

Ah yeah of course. I'll have to investigate this behavior in our case 
(again different target public)