Arch Linux

pogeymanz

Member

Registered: 2008-03-11

Posts: 1,020

So I just compiled a BUNCH of stuff and...

I just realized that my CFLAG line is nocona, when the wiki says that for gcc >= 4.3.0 should be core2. Did I just waste a bunch of time?

evilgold

Member

Registered: 2008-10-30

Posts: 120

Re: So I just compiled a BUNCH of stuff and...

well core2 might have a few more optimizations then nocona, but it shouldnt make things any worse then the defaults. I always just use march=native on all my systems.

quarkup

Member

From: Portugal

Registered: 2008-09-07

Posts: 497

Website

Re: So I just compiled a BUNCH of stuff and...

I just realized that my CFLAG line is nocona, when the wiki says that for gcc >= 4.3.0 should be core2. Did I just waste a bunch of time?

Depends on your system's cpu - I use the following flags when I use gcc for compiling my apps:

-O2 -mtune=`uname -m` -march=`uname -m`

man gcc

nocona
               Improved version of Intel Pentium4 CPU with 64-bit extensions,
               MMX, SSE, SSE2 and SSE3 instruction set support.

           core2
               Intel Core2 CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3 and
               SSSE3 instruction set support.

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If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is.
Simplicity is the ultimate sophistication.

Mr.Elendig

#archlinux@freenode channel op

From: The intertubes

Registered: 2004-11-07

Posts: 4,097

Re: So I just compiled a BUNCH of stuff and...

This is what I use on my all my x86_64 boxes:

CFLAGS="-march=native -O2 -pipe"
CXXFLAGS="$CFLAGS"

Anyway, I doubt that you will notice mutch of an performance difference between 'nocona' and 'core2'.

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Evil #archlinux@libera.chat channel op and general support dude.
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Ranguvar

Member

Registered: 2008-08-12

Posts: 2,577

Re: So I just compiled a BUNCH of stuff and...

nocona is very similar to core2.

The real question is, did you use optimized LDFLAGS? If not, there's your waste of time