Just read through the documentation. There are so many great ideas for generating efficient code. `goto mode` in particular is an awesome idea. Generalizing the program to have multiple "entry" points and overlapping their global variables to save RAM, I've never heard of that technique before.
The inline assembly integration looks nice too -- accessing the arguments and return address as fields on the function makes a lot of sense.
The inline assembly integration looks nice too -- accessing the arguments and return address as fields on the function makes a lot of sense.