Features/ArchitectureSupport - changing what we build for

Gregory Maxwell gmaxwell at gmail.com
Sat Jan 31 00:47:45 UTC 2009


On Fri, Jan 30, 2009 at 6:18 PM, Jan Kratochvil
<jan.kratochvil at redhat.com> wrote:
[snip]
> Guessing some software (codecs?) may fallback on 64-bit to unoptimized C code
> instead of some assembly one but Fedora would at least show the usefulness of
> the updates of such software for the x86_64 arch.

Try GLIBC:  For example, x86_64 exp() (and expf()) is *much* slower
than x86.  (At least as of my testing in Fedora 9, I haven't measured
F10… the point being that these differences can lurk in unexpected
places.

They need to be fixed in anycase, but useful to keep in mind.




More information about the fedora-devel-list mailing list