An implementation of a particular block cipher called sea, in '51 and AVR asm. The latter is a result of a manual translation from the former, compare both files and you will see it immediately.

Note, that this is a bad example for my point (just an illustration for how easy or difficult the "mechanical translation" is), as this is a routine with almost no "hardware" or I/O dependency, so it would present no work in C - as long as the particular C compiler would not surprise you with problems I described above (no rules for int, sign extension).

I repeat my point: the "rewriting all lines" is almost a mechanical work - it's easy if you are familiar with both asms (which is a natural requirement if you use asm at all). The point is in identifying and solving the "hardware dependencies", and that's a similar task both for asm and C.

Jan Waclawek