Am 19.01.2015 um 15:28 schrieb Gerd Hoffmann:
Would that make it impossible to run fedora on sse-only i686 CPUs?Yes, but test coverage for those CPUs is already rather poor, so I don't expect them to work anymore.See other replies, people are running such machines. Given x86_64 exists for many years and even embedded (see aarch64) is moving to 64bit these days i386 clearly is for old legacy hardware. If you need performance you don't run a i386 machine. So, why bother raising the bar for i386 by requiring more cpu features? It doesn't help anyone.
"rpmrc" has optflags: for different architectures so why not optimize only "optflags: x86_64" for more recent hardware? since i686 is a complete different build anyways it won't matteron my private builders it's "-mmmx -msse2 -msse3 -msse4.1 -msse4.2 -maes -mfpmath=sse" for a long time and will become "-mavx -mfpmath=avx" after replace the oldest servers from 2010 with SandyBridge or newer based Xeons this year (any workstations are SandyBridge/IvyBrdige already) and "-march=corei7-avx -mtune=corei7-avx" too
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