I mean, ideally it shouldn't. The vast majority of apps should just recompile. But I don't think you can compare them quite like that, remember that the iPad/iP

I mean, ideally it shouldn't. The vast majority of apps should just recompile. But I don't think you can compare them quite like that, remember that the iPad/iPhone emulators on Xcode run x64 code, not ARM. If you're doing anything that depends on architectural features or drops into inline assembly, you're going to need either an ARM emulator on your x64 box (which apple doesn't do right now for iPad/iPhone dev), or an ARM box to test on. Right now for iPad/iPhone development, if you wish to use some assembly you can test it on device.