Your CPU Has More Registers Than You'd Think

This is about register renaming, but the headline is true even if you stick to architectural registers… I was also amused by this more recent thread on the topic.

Also related: https://blog.yossarian.net/2020/11/30/How-many-registers-does-an-x86-64-cpu-have, which inspired me to write https://wiki.alopex.li/HowManyRegistersShouldAnX86_64CPUHave.