Clang and the arm64 backend did literally originate at Apple. Not sure what you want me to tell you.
That's the first thing I saw in the copyright file
Copyright: 2003-2017 University of Illinois at Urbana-Champaign.
Do you think it was made at Urbana because it uses the uiuc license? I suppose you think everything that uses the mit license originated in cambridge
Apologies, I focused on LLVM as a whole. You are right about clang (and I didn’t know about the arm64 backend)
Actually the arm64 backend is a grey area. I knew some guys that worked on it in secret at Apple. They definitely created and Developed it at Apple and dropped it on the community after the iPhone 5s launched, replacing the existing aarch64 backend.
I’m not 100% certain if they started with any bits of the previous aarch64 backend or not though.