Daniel J Blueman wrote: > All older VIA processors, AMD Geode procs and so on support the full > i586 instruction set, which including MMX instructions and registers, > which itself can provide a good win. >
Geodes have partial implementation, particularly they only handle a few PREFETCH instructions IIRC. >>> (does any of this apply to x86-64, eg -mtune=core2 or k8?) >> Yes but this becomes a mess. Leave it as is. gcc is good at tuning >> to general-purpose in an instruction set. > > -mtune is instruction-set invariant. gcc will tune for for i386 > scheduling, ie fewer pipeline stages. It's later processors that have > had to optimise for short-pipeline-scheduled code, not the converse. > IA64 would have been crippled if the instruction scheduling wasn't > right from the outset. > Why the hell would you tune 64-bit instructions for a 32-bit processor? x86-64 has as much to do with IA-32 (i386, x86, i686, etc) as PPC has to do with SPARC. -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
