I don't see a problem here, never had an issue keeping track which register I was using for what. And I almost never used the stack in my code, other than savin

I don't see a problem here, never had an issue keeping track which register I was using for what. And I almost never used the stack in my code, other than saving and restoring the registers I was going to use before and after the subroutine. Even that was unnecessary, I did it just to be clean.