Originally Posted by jchamier:
“From Anandtech's and Chipworks reports, and the fact that Apple bought a chip design company, I'm pretty sure they don't adapt ARM's designs, but design from scratch using ARMs patents.”
Nope.
How I read into in the past(Anand explained it I'm sure) was that they took all the designs and modified them in various ways such as creating shorter interconnects and adding only parts of the ARM A15 design into an ARM A9 design to create the Apple A5.
The A7 and A8 likely use that same principal with ARMs A53 and A57 cores.
Qualcomm did the exact same with Krait. As we know, ARM released a Cortext A12 very similar to the Apple and Qualcomm stuff. So, we even have a chicken and egg question with all 3 of the 32 bit designs.