[jcelerier]

> Yet watchOS migrated from 32 bit to 64 bit.

that is what they said in the press release but in practice they migrated from "classical" 32bit ARM to ILP-32 (akin to the x32 ABI on linux) so the size of pointers, etc etc does not change from 32-bit. You get more registers & stuff like that which is nice, but that is not moving to 64 bit, just having nicer 32 bit execution on 64 bit CPUs. If you want proper aarch64 support on WatchOS you have to recompile.

[pjmlp]

Fair enough. Still nothing prevents LLVM bitcode to be fully CPU agnostic, if LLVM guys were willing to keep such variant around.