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Subject: Re: [gentoo-user] -march=native
From: Paul Hartman <paul.hartman+gentoo@gmail.com>
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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