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Re: G3/G4 -march flags?
Am Mit, 2002-05-08 um 18.00 schrieb Jack Lloyd:
> Are there any extra flags beyond the usual optimization flags that I could
> pass to GCC (2.95.x, 3.0.x, or 3.1.x) which would usefully optimize an
> integer-intensive program on a G3 or G4?
Assuming you're talking about a PowerPC machine the answer is no, not
really. You can pass -mcpu=7400 and -mtune=7400 above 3.0 (IIRC) but
this will affect scheduling just slightly. The difference between the
PPC750 (G3) and the 7400 (G4) is minimal while the 7450 (newer G4s)
have a longer pipeline and other changes to achieve higher clock speeds;
using -mcpu=7450 -mtune=7450 in 3.1 or CVS might help here but I such a
machine to benchmark it.