Register allocation is a NP-hard problem. See “Register Allocation:What does the NP-completeness Proof of Chaitin et al. Really Prove?” via this thread on RTX2010 – Radiation-hardened stack machine microprocessor

What every programmer should know about memory, Part 1 [] by Ulrich Drepper; September 2007. 9 part series.

Why is Apple’s M1 Chip So Fast?. Real world experience with the new M1… | by Erik Engheim | Nov, 2020 | Medium; Nov 2020.