Are there any iOS devices equipped with arm64 architected CPU?

Question

Some old libraries just don't support arm64, but I found it's default in XCode5.1, are there any iOS devices using this instruction set? Currently, I just don't want it and removed it from the Build Settings, will there be any problem?

Answer 1

If you can't support arm64, it's safe to remove it. All arm64 devices also support 32-bit.

Answer 2

All A7 devices are arm64. Currently that includes iPhone 5s, iPad Air, and iPad Mini Retina.