[guenthert]

Alternatively, an invalid instruction fault is signaled, handled by the OS, which activates the core capable of that instruction and migrates the process there. Not cheap, but I would expect that to happen rarely, if the lesser core is only used during low-power operation.

[saagarjha]

Yeah, but that means that every process is going to forced to run on the big core the moment that you call into libc's vectorized string functions…