Looks like you yourself reuse the C version from time to time without bothering with the super fast, short assembly version!
Is that so strange? I for one, use assembly when speed is critical and faster code is required, but if speed is not I do not search to see if I have an assembly routine.
For maintainability reasons I use assembler only when required, never just to use it. So, staying with Michaels example, if the keypad routine a) did not need to react quicly and b) did not bog doen mainloop speed I would never consider assembler except if there was a timing critical component.

Mahmood, you have shown yourself as a very strong C proponent and that is fine, but please - what we do in assembly has a purpose other than to make Mahmood ask "why not C".

Erik