Fine--tuning a Sempron system

[vencik]

Hi,

does anyone have an experience with setting suitable CFLAGS for
AMD Sempron with Palermo core (on socket 754)?

I was thinking about something like
-march=athlon-4 -mfpmath=sse -msse2
or just
-mfpmath=sse -msse -msse2 -mmmx -m3dnow

Any suggestions for -mtune/-march?

Thanks,

vencik
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[nxsty]

I think -march=athlon-4 is the correct option for your CPU. Don't use -mfpmath= it will only make code slower. Also the correct -mmmx, -msse etc. options are already included by -march, except sse2 but sse2/sse3 support is currently broken in gcc anyway.