From: Paul Hartman <paul.hartman+gentoo@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] -march=native is *EXTREMELY* conservative
Date: Sat, 17 Dec 2011 19:15:57 -0600 [thread overview]
Message-ID: <CAEH5T2PLDCByNhShvm4gE8bkkpxjWH3O7v=tpZyADnhHnqSQYQ@mail.gmail.com> (raw)
In-Reply-To: <20111217210709.GA1740@waltdnes.org>
On Sat, Dec 17, 2011 at 3:07 PM, Walter Dnes <waltdnes@waltdnes.org> wrote:
> -march= core2
> -mmmx [disabled]
> -msse [disabled]
> -msse2 [disabled]
> -msse3 [disabled]
> -mssse3 [disabled]
>
> It properly identified the cpu as "core2". But mmx, sse, sse2, sse3
> (aka pni), and ssse3 are disabled!!!
I think you may be misinterpreting that output. It's not telling you
that MMX etc. are disabled, it's telling you that the /commandline
options/ are disabled. Why?
From the GCC docs:
"core2: Intel Core2 CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3
and SSSE3 instruction set support."
That means those features are implied by -march=core2, adding those
commandline switches would be redundant.
prev parent reply other threads:[~2011-12-18 1:17 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-17 21:07 [gentoo-user] -march=native is *EXTREMELY* conservative Walter Dnes
2011-12-17 21:53 ` Dale
2011-12-17 21:58 ` [gentoo-user] " Nikos Chantziaras
2011-12-18 1:10 ` Walter Dnes
2011-12-18 10:34 ` Walter Dnes
2011-12-18 10:45 ` Nikos Chantziaras
2011-12-18 18:10 ` Andrea Conti
2011-12-19 0:05 ` [gentoo-user] A tale of computing thud and blunder Walter Dnes
2011-12-19 0:17 ` Dale
2011-12-19 5:41 ` Pandu Poluan
2011-12-19 6:15 ` Dale
2011-12-19 6:49 ` [gentoo-user] " Nikos Chantziaras
2011-12-19 7:21 ` Dale
2011-12-19 12:49 ` walt
2011-12-19 8:14 ` [gentoo-user] " Pandu Poluan
2011-12-19 16:37 ` Paul Hartman
2011-12-18 1:15 ` Paul Hartman [this message]
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