[saagarjha]

By “Intel” I really meant “x86” :P Is there an ARM compiler that recognizes it?

[secondcoming]

Unlikely, intrinsics are CPU, and sometimes CPU model, specific. Compiler builtins will instead use the intrinsic if it's available/suitable or generate equivalent code if it's not.

[pizza234]

Ah! Sorry for that; I have no idea.

It seems that at least some ARMs have [timers that can be used](https://electronics.stackexchange.com/q/450971), which is a different strategy, but still more appropriate (I suppose).