<snip>
>      CFLAGS="-O3 -m3dnow -march=athlon-xp -mtune=athlon64 -msse -msse2 -msse3 
> -m3dnow -mfpmath=sse -funroll-loops -fomit-frame-pointer  -finline-functions 
> -falign-functions=4 -mpreferred-stack-boundary=2"
<snip>

Before doing anything else, please clean up your CFLAGS and do 
"# emerge -e system; emerge -e world"

If you realy want x86 (with your cpu i would reinstall an amd64 system
http://www.gentoo.org/doc/en/handbook/handbook-amd64.xml) then use:

CFLAGS="-O3 -march=athlon-xp -fomit-frame-pointer"

because, mostly all of your flags are redundant and the combination
"-march=athlon-xp -mtune=athlon64" will give you nothing but maybe
broken compiler output.

You may also be interested in these pages:
http://gentoo-wiki.com/Safe_Cflags
http://gcc.gnu.org/onlinedocs/gcc-3.4.6/gcc/Optimize-Options.html#Optimize-Options
http://gentoo-wiki.com/CFLAGS
http://gentoo-wiki.com/CFLAGS_matrix

HTH,
Matthias




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