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Date: Tue, 4 Jun 2002 21:22:07 -0600
From: Dave Lee <davel@canuck.com>
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Subject: Re: [gentoo-dev] gcc 3.1 inconsistencies :
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Spider wrote:
> soo, right now I'm running march=athlon-tbird -O3 -pipe for most things

In case anybody is curious like I was:

I didn't know the difference between the various athlon arch settings,
athlon-tbird, athlon-xp, etc.  I found that there are two athlon 
variations, those with the sse instruction set and those w/o sse.

no sse: athlon, athlon-tbird
sse: athlon-4, athlon-xp, athlon-mp

`grep sse /proc/cpuinfo` to see if your cpu has sse, though I don't know
how reliable cpuinfo is.  I have a duron 1GHz, and it has sse, but earlier
durons, <1GHz, don't have sse.

also, when you do either of -msse -m3dnow gcc automagically does -mmmmx
for you.

from what I see, athlon and athlon-tbird are identical arch settings, as
are athlon-4, athlon-xp, and athlon-mp.

so can anyone verify this?  of course its possible the different names are
there for finer grained code gen in the future.

Dave