[gmx-users] Runtime CPU capabilities detection

[David van der Spoel]

Jussi Lehtola wrote:
> Hi,
> 
> 
> I'm doing a Fedora package of GROMACS. Does GROMACS have runtime CPU
> capability detection, i.e. if the package is compiled on a SSE-capable
> processor and run on an i586 (hope not), will it work?
Yes it does. It should work, but e.g. debuggers tend to dislike illegal 
instructions (when e.g. testing for 3DNow on a pentium).
> 
> The safe way is, of course, to disable all assembly loops, which would
> hurt performance a lot...


-- 
David van der Spoel, Ph.D., Professor of Biology
Molec. Biophys. group, Dept. of Cell & Molec. Biol., Uppsala University.
Box 596, 75124 Uppsala, Sweden. Phone:	+46184714205. Fax: +4618511755.
spoel at xray.bmc.uu.se	spoel at gromacs.org   http://folding.bmc.uu.se