Nice write up. I admire the author's work in general.

I wrote a little more about critical edge splitting and out-of-SSA:

https://nickdesaulniers.github.io/blog/2023/01/27/critical-e...

Good explanation why Go's compiler sucks on some/most cases (with lot of If's).

I thought that because GoLang has an LLVM backend, that register allocation was handled by LLVM itself?

Who thought it was a good idea to have scrolling change the page history?