Gentoo Archives: gentoo-user

From: Paul Hartman <paul.hartman+gentoo@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] -march=native
Date: Wed, 30 Jun 2010 14:30:53
Message-Id: AANLkTik9RTERM10eyobIkw-sTMeQjNe3C64KE2EsKh2P@mail.gmail.com
In Reply to: Re: [gentoo-user] -march=native by Beau Henderson
1 On Tue, Jun 29, 2010 at 8:09 PM, Beau Henderson <beau@××××××××××××.com> wrote:
2 > On 06/30/10 08:07, Paul Hartman wrote:
3 >>
4 >> 2010/6/29 Hasan SAHIN<hasan.sahin@×××.com>:
5 >>>
6 >>> Hello all,
7 >>>
8 >>> I am using Athlon64 X2 processor with the
9 >>> CFLAGS="-march=k8 -O2 -pipe -fomit-frame-pointer" option.
10 >>>
11 >>> Can I use the -march=native option instead of that?
12 >>
13 >> You can see which options -march=native would use by running this command:
14 >>
15 >> gcc -Q --help=target -march=native
16 >>
17 >> (thanks to Daniel Iliev for the tip)
18 >>
19 >
20 > Perhaps I'm missing something but running the above gives me the impression
21 > that -march=native actually only configures the bare minimal install. I'm
22 > not seeing -mmmx or -msse3 enabled on my k8-sse3 for instance ( amongst much
23 > else ).
24
25 What -march setting is it showing in that output? The MMX (etc) may be
26 enabled implicitly instead of explicitly.
27
28 It's also possible that the CPU detection is failing to identify your
29 CPU. In that case you could probably file a bug report about it.

Replies

Subject Author
Re: [gentoo-user] -march=native Beau Henderson <beau@××××××××××××.com>