How to determine ARMv8 features at runtime on iOS?

Question

I am trying to determine when optional ARMv8 cpu features are available on iOS at runtime. On OS X desktops, like i686, x86_64, PPC and PPC64 we can use sysctl.

Answer 1

As far as I know Apple is going to remove the support to 32-bit chips this year. Since Apple A7 processors Apple uses ArmV8-A cores for its SoCs...so maybe you cannot choose them with the new APIs because you have nothing to choose...Apple usually is cryptic about those kind of things and uses automatic switching for certain features on mobile platforms. However basically every iOS 11 SoC will have the same basic hardware features except for the number of cores and the energy management (which is different for SoC >= A10 Fusion). I was searching for the same thing some month ago but apparently on iOS you have to be in the hands of the OS.