SSE3 was introduced 15+ years ago.
IMHO when all system will be compiled with a SSE3 enabled, we can benefit with a (modest) speed-up.
Of course, this will be a new requirement: nowdays it is SSE2 (SSE2 is a part of AMD64), new will be SSE3.
But nearly all processors that in use supports SSE3.
Next steps (supporting SSSE3 = supplemental SSE3, SSE4, AVX, …) will be very hard because of Phenom and Phenom II which limits supporting instructions but are too fast to throw these processors away.
Probably because SUSE’s largest customer (Walmart) has 1000’s of Phenom FX computers that will still be used for the next 8-10 years. Heck, Walmart has some old Microchannel computers in use. I know their Fax servers are on old 486 based NCR Microchannel PCs.
Ironically Walmart is still running SUSE 11 not 15 but are supposed to be migrating to SUSE 15. Walmart has 1000’s of apps that have to be tested under 15 to see if anything breaks with the new libraries - I know many have libc issues and Walmart ISD hates “C” and wants to convert everything to Java (the world’s least secure language and least efficient size and speed wise).