iPhone detecting processor model / NEON support

Question

I\'m looking for a way to differentiate at runtime between devices equipped with the new ARM processor (such as iPhone 3GS and some iPods 3G) and devices equipped with the old A

Answer 1

EDIT: I have withdrawn this answer, as it left out a glaring hole I realized later: what to do when we get an unknown subtype on some future hardware? THIS WAS NOT FUTURE-PROOF. Also, the uncertainty of the documented status of that API doesn't help, given Apple's zero tolerance on usage of undocumented APIs.

You should use Stephen Canon's answer and build your application fat. Reliable, future-proof runtime detection is not feasible at this time (to my dismay, I assure you).