I believe the Pentium M arch is only in gcc 3.4. So I think you should
use Pentium 3 for march, and also use flags to enable sse2, etc.

--Geoff Mishkin <gmishkin@comcast.net>


On Wed, 09 Jun 2004 19:24:40 +0100, hrv wrote:

> Hi,
>
> just got a centrino laptop (for free) so have to use it whether I want it or
> not . I can swear I've seen "-march=pentium-m" somewhere on the Net but
> now when I actualy have the hardware and have gone through gcc man it seems
> like I was hallucinating and there is now such thing.
> I'd really appreciate some comments on pentium-m optimization. Has anybody
> tried it with "-march=pentium4"? Any weird behavior?
> AFAIK, pentium-m is just a P3 CPU with added ess2, SpeedStep gen.3, 3d
> predictor, "fixed up" pipe-lines and few other tweaks. So optimizing for P3
> would definitely work but seems like loosing few things, at the same time
> optimizing for P4 seems a bit worrying since I'm not sure about the ABI of
> both CPUs.
> Comments ??
>
> Thanks.