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Beso wrote: |
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>> CFLAGS="-march=nocona -O2 -pipe" |
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> |
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> first of all: nocona breaks your build. nocona isn't an amd processor |
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> but an emt64 (intel). for your processor you need to use march=k8. |
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> also, i'd use -Os instead of -O2 since it has some speed and size |
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> optimizations and it's stable. |
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|
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-Os optimizes for size, while -O2 optimizes for speed. There is no need |
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at all to use -Os on a modern desktop machine, and it will run |
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comparatively slower than -O2 optimized code, which is probably not what |
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you want. |
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|
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>> CHOST="x86_64-pc-linux-gnu" |
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>> USE="3dnow mmx sse sse2 threads threadpool -multilib" |
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> |
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> sse isn't supported on athlons, so remove it |
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|
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As we're talking about athlon64 here, it definitely is. The Athlon64 X2 |
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supports mmx, mmxext, 3dnow, 3dnowext, sse and sse2. And the AM2 models |
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also support sse3, but not ssse3 or sse4. |
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|
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And as for -march, -march=athlon64 equals -march=k8 (see the gcc |
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manpage). So you can choose either one and get the exact same optimizations. |
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|
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I hope this clears a few things up. |
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|
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Cheers, |
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-- |
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Ben de Groot |
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Gentoo Linux developer (lxde, media, desktop-misc) |
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Gentoo Linux Release Engineering PR liaison |
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__________________________________________________ |
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|
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yngwin@g.o |
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http://ben.liveforge.org/ |
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irc://chat.freenode.net/#gentoo-media |
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irc://irc.oftc.net/#lxde |
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__________________________________________________ |
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