From: Paul Hartman <paul.hartman+gentoo@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] -march=native
Date: Wed, 30 Jun 2010 09:26:05 -0500 [thread overview]
Message-ID: <AANLkTinxvXJUX4cbJRUKMGjmR9-UTd4oQY9EjvX42K76@mail.gmail.com> (raw)
In-Reply-To: <1277862850.1329505.6.camel@paska>
On Tue, Jun 29, 2010 at 8:54 PM, Albert Hopkins <marduk@letterboxes.org> wrote:
> On Wed, 2010-06-30 at 11:09 +1000, Beau Henderson wrote:
>> On 06/30/10 08:07, Paul Hartman wrote:
> [...]
>> > You can see which options -march=native would use by running this command:
>> >
>> > gcc -Q --help=target -march=native
>> >
>> > (thanks to Daniel Iliev for the tip)
>> >
>>
>> Perhaps I'm missing something but running the above gives me the impression that -march=native
>> actually only configures the bare minimal install. I'm not seeing -mmmx or -msse3 enabled on my
>> k8-sse3 for instance ( amongst much else ).
>>
>
> -march sometimes implies a some things. E.g., anything above a pentium2
> implies MMX. My hunch is that k8-sse3 implies... sse3.
See this page of the GCC documentation for some info about what is
enabled in the different arches:
http://gcc.gnu.org/onlinedocs/gcc-4.4.3/gcc/i386-and-x86_002d64-Options.html
next prev parent reply other threads:[~2010-06-30 14:26 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-30 0:54 [gentoo-user] -march=native Hasan SAHIN
2010-06-29 22:00 ` Bill Longman
2010-06-29 22:01 ` Alex Schuster
2010-06-29 22:03 ` Bill Longman
2010-06-30 1:08 ` Hasan SAHIN
2010-06-29 23:12 ` Bill Longman
2010-06-29 22:07 ` Paul Hartman
2010-06-30 1:09 ` Beau Henderson
2010-06-30 1:54 ` Albert Hopkins
2010-06-30 14:26 ` Paul Hartman [this message]
2010-06-30 14:30 ` Paul Hartman
2010-06-30 22:21 ` Beau Henderson
2010-07-04 17:52 ` James Cloos
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