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I once read an article, where a former Apple engineer claimed that Apple actually tasked ARM with creating AArch64 and also had certain input, which might also explain why they were much quicker on the draw.
There is little doubt that Apple were closely involved in the development of AArch64. The design looks like a sort of merger of the best parts of ARM-32-bit and PPC, with some features to facilitate OoOE. And, of course,
it is almost as though Apple designed AArch64 and then let ARM claim it the way AMD let Anthill use x86-64.Apple shipped A7 in volume about a year before Cortex-A53 and A57 began sampling in SoCs. Apple probably began detailed design of their 64-bit core before Arm did.