Comment # 29 on bug 1183454 from Stefan Seyfried

(In reply to Dirk Weber from comment #28)
> will make Tumbleweed i586 unusable on
> most real x86_32 CPUs (all except Pentium-4) which would probably impact its
> users seriously.

Pentium M also has sse2, which is in my experience the processor most likely to
still run a 32bit distribution in a useful way ;-)
But yes, checking if sse2 is used "by accident" is a good idea.