precision integer arithmetic

[David A. Frank]

I would like to obtain some public-domain 64-bit precision (or greater)
integer arithmetic source code. 

- Should be able to do 64-bit integer addition, subtraction,
multiplication, and division. 

- C code is preferred. Eventual use on a 68020. 

- Efficiency is important.

Please respond via electronic mail to 

DDN: dfrank at nosc.mil 
UUCP:{ihnp4,akgua,decvax,dcdwest,ucbvax}!sdcsvax!nosc!dfrank

Thank you,
David Frank