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Date: Sun, 4 Sep 2005 02:11:13 -0400
From: ellotheth rimmwen <ellotheth@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] cpu flags / USE flags / compiler flags
In-Reply-To: <20050904032719.GA6185@waltdnes.org>
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Hm. Clear, brief, instructive. Smells a lot like a mini-HOWTO.
On 9/3/05, waltdnes@waltdnes.org <waltdnes@waltdnes.org> wrote:
> There are CPU flags and there are USE flags. Some of them have the
> same names, and that may confuse you. It works like this...
> 1) Get a listing of your cpu's flags in /proc/cpuinfo
> 2) Check against the list of supported flags in gcc for you cpu, and
> add them to CFLAGS
> 3) Check http://www.gentoo.org/dyn/use-index.xml for a list of valid
> USE flags, and include any that show up in /proc/cpuinfo
> 4) Repeat step 3) with /usr/portage/profiles/use.local.desc for any
> programs you're emerging. There doesn't seem to be anything
> special on your pentium4, but my AMD64 not only has mmx and 3dnow,
> it also has mmxext and 3dnowext. mplayer can take advantage of
> them. I include them in the /etc/portage/package.use entry for
> media-video/mplayer.
>
> I'll assume that you're using gcc 3.3.5. In that case, the place to
> look for CPU flag options is...
>
> http://gcc.gnu.org/onlinedocs/gcc-3.3.5/gcc/i386-and-x86_002d64-Options.html#i386-and-x86_002d64-Options
>
> That list shows pentium4, mmx, sse, and sse2. Also, if you have *ANY*
> version of sse available, you can improve performance by running floating
> point math via sse, rather than 387 instructions. I recommend...
>
> CFLAGS="-O2 -pipe -fomit-frame-pointer -march=pentium4 -mmmx -msse -msse2 -mfpmath=sse"
>
> http://www.gentoo.org/dyn/use-index.xml shows mmx and sse as valid USE
> flags, so you can include them in USE.
>
> --
> Walter Dnes <waltdnes@waltdnes.org>
> My musings on technology and security at http://tech_sec.blog.ca
> --
> gentoo-user@gentoo.org mailing list
>
>
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