Another thing they can do: it allows them to introduce new non-ARM-standard ops and immediately recompile the app store to take advantage of them. Every now an

Another thing they can do: it allows them to introduce new non-ARM-standard ops and immediately recompile the app store to take advantage of them. Every now and then I see a new comparison of the Swift/ObjC dispatch assembly. Now imagine — that could be a single opcode. Or the dispatch table could get pinned to a particular cache. Or it could be other micro-optimizations that they are in a unique position to exploit with full control of the language, compiler and chip. I have no idea how feasible these things might be or how much of a gain it would create, but they can look through their corpus of LLVM-IR and identify hot-spots where a new opcode would speed everything up by some margin.