Ulrich Drepper wrote: > Pádraig Brady wrote: >> -march=i686 is better than i586, but is it the best. >> I though -march=prescott was optimal for atom? > > The Atom core has nothing to do with the Core2 or P4 or any other core. > Whoever told you Prescott is optimal doesn't know what s/he's talking > about. All cores after the i586 are out-of-order cores, the Atom is an > in-order. This should show you how silly that statement is. > > We are still waiting for Intel to disclose the details about the > micro-architecture. There is no backend support in gcc yet. I had a quick look and the consensus at the moment for atom optimized CLFAGS is -march=prescott, but that's really due to that being the most appropriate flag for commonly available gcc at the time people were looking at it: http://forums.gentoo.org/viewtopic-p-5127497.html Intel have said that the Atom is merom (core2) ISA compliant, and also that it's an in-order core. So perhaps the optimum flags at present are: -march=core2 -mtune=i586 ? cheers, Pádraig. -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
