On 4/20/11 5:57 PM, Jerry James wrote:
> On Wed, Apr 20, 2011 at 3:32 PM, Adam Jackson<ajax@xxxxxxxxxx> 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
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