> I assume the compiler is not stupid enough to try and use both when that
> is impossible.  Don't forget this is all just passing a CPU name to gcc
> which actually decides what instructions to use.

That's not what I mean... What I mean is that if one application is using
SSE, and the other wants to use 3dnow, this will incur a performance
penalty (although I'm not sure how much or how noticable it is), so some
people may not want to have SSE enabled.


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