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From: Dave Lee <davel@canuck.com>
To: gentoo-dev <gentoo-dev@gentoo.org>
Subject: Re: [gentoo-dev] gcc 3.1 inconsistencies :
Date: Tue, 4 Jun 2002 21:22:07 -0600	[thread overview]
Message-ID: <Pine.SGI.4.21.0206042056110.27878136-100000@the-gimp> (raw)
In-Reply-To: <20020605032351.4194bfa6.spider@gentoo.org>

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



  reply	other threads:[~2002-06-05  3:26 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-06-05  1:23 [gentoo-dev] gcc 3.1 inconsistencies : Spider
2002-06-05  3:22 ` Dave Lee [this message]
2002-06-05  5:00 ` fthieme

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