[ros-users] Question about cmake and SSE optimizations

[Tully Foote]

Jose,
This was an issue with the tf compile flags.  As far as my research got me
there is not a good standard way to test for it on all platforms.  On linux
you can read /proc/cpuinfo

I have an open ticket with a few relevant links I have found.
https://code.ros.org/trac/ros-pkg/ticket/3906  If you find something please
either post back here or there.  If we can find a good generic solution I
will add it to the ROS build documentation.

Tully

On Tue, Mar 23, 2010 at 9:06 AM, Jose Gonzalez <de0a100 at gmail.com> wrote:

> Hi,
>
> Doing some experiments in the past with OpenCV (linux/g++) I realized
> that there is a significant performance difference between the
> versions compiled with autoconf and cmake. Digging in the compilation
> scripts I came to the conclusion that the only extra flags that were
> added by the autoconf scripts were the SSE optimizations (and openMP).
>
> Talking about the SSE optimizations, I can see how ROS sets the flags
> in a similar way. When the detected platform is i686, all the SSE
> optimizations are disabled by default (there is a comment "SSE/SSE2
> might probably be not available for some old AMD or VIA processors").
> Before finding out a solution by myself I'd like to ask the list if
> somebody knows a standard way of testing for SSE optimizations in
> cmake.
>
> Thanks,
> Jose
>
>
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-- 
Tully Foote
Systems Engineer
Willow Garage, Inc.
tfoote at willowgarage.com
(650) 475-2827
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