On Mon, Jun 15, 2009 at 06:04:15PM -0400, Bill Nottingham wrote: >Gregory Maxwell (gmaxwell@xxxxxxxxx) said: >> Is dropping hardware worth this instruction? I suggested some >> benchmarking and demonstrated that it's a very small improvement for >> Theora. I'm not sure if anyone got around to testing freetype, >> firefox, or any of the other couple CPU heavy desktop apps. >> >> It would probably be most interesting to perform that test on the >> x86-only ATOM, since I can see CMOV being a bigger win on an in-order >> CPU. >> >> (I can't personally protest: I think all the x86 stuff I have has CMOV). > >Last time I profiled it (using the bits of openbench that actually worked), >i586 -> i686 was an improvement of 1% (Core2Duo) to 2% (Atom). Athlon64 was >essentially equal. > >SPECCPU results showed similar. Wasn't code paths in glibc and possibly other packages a concern? I seem to remember the glibc maintainer not being happy with using i586 at all, but conceded to it as a path to i686. josh -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
