drago01 (drago01@xxxxxxxxx) said: > > Way back when in February [1], FESCo decided that for Fedora 11, i586 would > > be the default architecture, and for Fedora 12, it would be some variant of > > i686. It's time to follow through on that action item. > > Moving to i686 is fine, non i686 chips are mostly dead (but the > perfomance gain from moving to i686 from i586 is questionable at > best). ... how so? It's consistently 1-2% in reasonable benchmarks (real-world code, albeit cpu-specific). > This is going to far, it makes x86 no longer useable on anything but > P4, Pentium M and Atom. > > The only chip which is worth optimizing for is the Atom but its not > worth killing support for a lot of older systems (ex: Athlon XP system > are still present and aren't much slower than the non 64bit cable P4) Well, we could use the Atom tuning support and build with -march=i686 -mtune=atom. That could be fun. > > Why? > > > > - Faster and more consistent FP math by using SSE2 registers > > Only in certain apps, and most of them have handwritten SSE routines anyway. -fpmath=sse is faster in general, not just in specifc apps. (According to all the toolchain people I've talked to.) Bill -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
