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Which -march option to use for my Processor
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rsnfunky
n00b
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Joined: 30 Dec 2007
Posts: 44

PostPosted: Sat Sep 21, 2013 4:43 pm    Post subject: Which -march option to use for my Processor Reply with quote

Hi All,

I have an AMD Phenom II X4 (965) processor. Which -march option should I use in my CFLAGS in make.conf. Do let me know if any other CFLAGS will go with my processor.

The link to my processor info is: http://en.wikipedia.org/wiki/List_of_AMD_Phenom_microprocessors#.22Deneb.22_.28C2.2FC3.2C_45_nm.2C_Quad-core.29

Link to -march options are: http://gcc.gnu.org/onlinedocs/gcc/i386-and-x86_002d64-Options.html#i386-and-x86_002d64-Options

Is "barcelona" the correct -march option? Am I required to use the -msse, -msse2, -msse3, -mmmx, -m3dnow options?

Thanks a ton for your help.

Regards,
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schorsch_76
Apprentice
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Joined: 19 Jun 2012
Posts: 214

PostPosted: Sat Sep 21, 2013 4:50 pm    Post subject: Reply with quote

Just use the safe CFLAGS from the wiki

https://wiki.gentoo.org/wiki/Safe_CFLAGS#A4.2FA6.2FA8-XXXX_.2F_XXXXM

For your CPU:

CFLAGS="-O2 -march=amdfam10 -mcx16 -mpopcnt -pipe"
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Ant P.
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Joined: 18 Apr 2009
Posts: 2518
Location: UK

PostPosted: Sat Sep 21, 2013 5:01 pm    Post subject: Reply with quote

If using distcc:
Code:
echo $(
    gcc -v -march=native -x c /dev/null 2>&1 | \
    grep -- '-march' | \
    egrep -o -- '-+(m|param )[-_=.a-zA-Z0-9]+' | \
    sort -u
)


Otherwise:
Code:
-march=native
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