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Varean
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PostPosted: Fri Aug 11, 2006 7:22 pm    Post subject: Quick optimization question Reply with quote

Im installing Gentoo again(last attempt failed) and this time, I want a generally stable build. However, I would like to know if the -03 option(instead of O2) is stable or relatively stable, or in fact much better than O2. I hear that does a decent job of speeding up the system.
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Deathwing00
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PostPosted: Fri Aug 11, 2006 7:25 pm    Post subject: Reply with quote

You shouldn't have any problems with it. I'm intrigued about your failures though :)
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Varean
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PostPosted: Fri Aug 11, 2006 7:27 pm    Post subject: Reply with quote

Deathwing00 wrote:
You shouldn't have any problems with it. I'm intrigued about your failures though :)


Well, it didn't exactly fail. It wasnt the OS' fault, but rather mine. Some dumb mistakes and rushing through the install made it a nightmare to clean it up. Im taking my time with this one to make sure I get everything right.

EDIT: Also, I am using an Athlon64 processor but I want to make a 32bit system(x86) is it safe to use -march=athlon-xp?
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Last edited by Varean on Fri Aug 11, 2006 7:36 pm; edited 1 time in total
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Deathwing00
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PostPosted: Fri Aug 11, 2006 7:35 pm    Post subject: Reply with quote

Good luck with it then :)
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Penguin of Wonder
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PostPosted: Fri Aug 11, 2006 10:04 pm    Post subject: Reply with quote

Varean wrote:
i'm also using an Athlon64 processor but I want to make a 32bit system(x86) is it safe to use -march=athlon-xp?

That is what i would recomend using.
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Deathwing00
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PostPosted: Fri Aug 11, 2006 10:31 pm    Post subject: Reply with quote

Using -march=k8 will not give you any troubles at all either. Check with the gcc manual for mroe detailed information.
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jmbsvicetto
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PostPosted: Fri Aug 11, 2006 10:32 pm    Post subject: Reply with quote

Varean,

if you want, you can use the -march=athlon64 in the 32-bits environment. In the 32-bits environment, that will activate the support for all features, except the 64-bits extensions. Take a look at man gcc:
Code:
           k8, opteron, athlon64, athlon-fx
               AMD K8 core based CPUs with x86-64 instruction set support.  (This supersets MMX, SSE,
               SSE2, 3dNOW!, enhanced 3dNOW! and 64-bit instruction set extensions.)

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