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To get my app to run on the iPhone 6 plus simulator, I have to add the arm64 architecture into the valid architectures. I got the fix from this SO link

But, what does adding arm64 to the architecture do?

Pertaining to my app, it has been on the App Store without arm64. What happens when someone with iPhone 6 plus downloads my app on the App Store and tried to open it. Will it crash?

Thanks

Community
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oky_sabeni
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1 Answers1

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A 32-bit app can be opened on a 64-bit device, but doing so requires loading a second, 32-bit version of the system. So it's inefficient.

matt
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    Good discussion in the tech talks (https://developer.apple.com/tech-talks/videos/) under "Architecting Modern iOS Games" - the talk is about 64-bit, it has nothing to do with games really. – matt Oct 29 '14 at 18:58