Duff's is not just about unrolling, it's mostly a way to use the 'case can be anywhere inside a switch statement'. It's used a lot for other purpose, some of th

Duff's is not just about unrolling, it's mostly a way to use the 'case can be anywhere inside a switch statement'. It's used a lot for other purpose, some of them very, very handy. The stackless coroutine trick is very useful for example (see http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html ) On platforms with very little RAM (embedded) it's fantastic to be able to 'port' linear code that might have run in a thread, and convert it to a coroutine that is a lot easier to read and maintain than having to convert it all up to a 'manual' state machine. Note that with gcc, you can reach the same results by using the 'indirect goto' that is both more powerful, and more dangerous! void * lab; lab = &my_label; goto *lab; my_label: ...