Re: Opinions on packaging ATLAS (for the x86 architecture)

[Bob Arendt <rda rincon com>]

On 09/25/09 12:37, Deji Akingunola wrote:
> On Fri, Sep 25, 2009 at 1:10 PM, Christoph Frieben
> <christoph frieben googlemail com>  wrote:
> > 2009/9/25 Chris Adams:
> > >
>
> > (Likewise, the default x86_64 package is currently called
> >
> >    atlas [<  atlas-sse3<  ... ]
> >
> > and is using SSE2 by default as expected for all x86_64 packages. Higher
>
> Actually the atlas x86_64 package is using SSE3 by default. I believe
> SSE3 is the least common denominator for the x86_64 cpus. And yes,
> whatever is determined for the x86_32 situation will also apply for
> SSE4* for x86_64.
>
> Deji
My Athlon(tm) 64 X2 Dual Core Processor 3600+ (running x86_64) isn't
showing SSE3;  From /proc/cpuinfo

flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca
cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
rdtscp lm 3dnowext 3dnow rep_good extd_apicid pni cx16 lahf_lm cmp_legacy
svm extapic cr8_legacy 3dnowprefetch

Unless the 3dnow extensions are equivalent to SSE3, it looks like SSE2
is the least common denominator for the x86_64 cpus.

-Bob