[aarchi]

I know that developers can post LLVM bitcode to the App Store instead of a binary, which allows Apple to recompile it for architectural changes. I'd be surprised if Apple optimized per device. Creating separate builds with optimizations for different iPhone models would make more sense. Do you have more details on that?

[restingrobot]

I think he meant "iPhone models" when he said "devices". I'm not the op, but they definitely do optimize per model, not individual device.

[danielrhodes]

Per model is what I meant.