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Kamyk
n00b
Joined: 09 Mar 2006
Posts: 2
Location: Poland
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 Posted: Thu Mar 09, 2006 8:54 pm Post subject: Simple question (not for me however...) |
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I have AMD Athlon 64 3000+ (S939) processor.
Should I use a flag -march=k8 or -march=athlon64 ? |
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neylitalo
Tux's lil' helper
Joined: 29 Jan 2006
Posts: 81
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| Posted: Thu Mar 09, 2006 9:22 pm Post subject: |
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-march=k8
I quote the Gentoo amd64 installation handbook (here)
| Quote: | | # AMD64 users who want to use a native 64 bit system should use -march=k8 |
Scroll down a bit to the CFLAGS and CXXFLAGS section to see the part I'm referring to. |
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-BarneY-
Tux's lil' helper
Joined: 03 Oct 2005
Posts: 91
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| Posted: Thu Mar 09, 2006 11:58 pm Post subject: |
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It simply doesn't matter. 
It's completely the same if you are using k8, athlon64, opteron or athlon-fx.
http://gcc.gnu.org/onlinedocs/gcc-3.4.5/gcc/i386-and-x86_002d64-Options.html#i386-and-x86_002d64-Options
| Quote: | 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.) |
edit: Hmmm, I'm just wondering a bit. The newer Athlon-64/FX CPU's have support of SSE3, so I'm asking me, if its useful to set the -msse3 flag, if you have a Venice or San Diego Core. I'd say es, but why there is no -march=athlon-venice? 
When your CPU supports SSE3 - (You can figure it out by cat'ing your cpuinfo - cat /proc/cpuinfo - and searching for SSE3 at the cpu flags.) - I would add -msse3 to your CFLAGS as well. |
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Kamyk
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Joined: 09 Mar 2006
Posts: 2
Location: Poland
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| Posted: Fri Mar 10, 2006 10:21 pm Post subject: |
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| Ok, thanks for your help |
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