Package with x86 vector instruction support

[Adam Jackson]

On 4/20/11 5:57 PM, Jerry James wrote:
> On Wed, Apr 20, 2011 at 3:32 PM, Adam Jackson<ajax at redhat.com>  wrote:
>> The least capable processor we've gone out of our way to fix things for is
>> the AMD Geode GX, which has MMX and 3DNow, but is also slightly less than a
>> proper Pentium Pro in that it doesn't have nopl or cmov.
>>
>> However, rpm sets --march=i686, which implies only Pentium Pro and does not
>> imply MMX or anything newer.  Not that I know of anyone who's tried running
>> Fedora on a bare i686 in recent memory.
>
> OK, that's fine.  I'll compile without any of the fancy vector
> instructions for i686, then explicitly pass an -march arg of my own (I
> see some other packages use -march=pentium4) for the version that will
> live in /usr/lib/sse2.  For x86_64, I'll make sure that SSE3 and SSSE3
> support is off and let it do its thing otherwise.

There do exist amd64 chips with sse3 and above.  I don't know offhand 
whether there's a %{_libdir}/sse3 for them, though I'd not be surprised 
and I suspect a quick read of the ld.so source would tell you.

- ajax