dag at bredband.no
Sun Jun 17 14:39:26 CEST 2001
> Dag B wrote:
> > Try compiling -mcpu=i686 for the k6-2 and compare the results
> with -march=k6.
> The K6-2 und K-3 are not 686 CPUs, the are 586 ...
> i cannot believe, that will work ...
-mcpu= controls scheduling
-march= controls instructions usage
Thus, using -mcpu=i686 creates code which runs on a 386 processor.
There is a theory that the i686 scheduling of gcc better suits the k6-2.
Or maybe it is just more mature than the i586 scheduling of gcc.
In either case, it is worth trying to squeeze the last drop of performance
out of the k6-2.
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