On Tue, Jun 29, 2010 at 8:54 PM, Albert Hopkins <mar...@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
