On Fri, 2006-07-14 at 10:47 +0200, dragoran wrote: > Arjan van de Ven wrote > >> no it wont because they will be i686 builds and RPM_OPT_FLAGS would be > >> differnet so the same SRPM can be used. > >> > > > > > > but to what point? > > > > I will actually here propose to stop doing i686 builds for most of the > > things it's done now; cmov just isn't worth it, and if you want to use > > SSE in 32 bit, that's not going to be cheap either (unlike 64 bit where > > it's a standard part of the ABI); SSE in 32 bit is not "just used" by > > gcc, only hand coded assembly uses it basically, and those can use .i386 > > just fine since generally they have a runtime detection mechanism. > > > > > what do you mean by not used by gcc? there are flags to use it -msse2 ... > many apps have runtime detection and use handcoded assembly but not all > of them just because gcc has a flag for something doesn't mean that it will magically start using it for applications and make those applications go faster.... because it won't for -msse2. Truely taking advantage of SSE means that the ABI needs to change (like x86-64 did from the start); and the moment you do that you might as well not bother; the entire purpose of i386-on-x86 is to use legacy binaries, which have the fixed, non-SSE ABI. -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
