Marko Rauhamaa <ma...@pacujo.net> writes: > Alain Ketterlin <al...@dpt-info.u-strasbg.fr>: > >> No, it would not work for signed integers (i.e., with lo and hi of >> int64_t type), because overflow is undefined behavior for signed. > > All architectures I've ever had dealings with have used 2's-complement > integers. Overflow is well-defined, well-behaved and sign-independent > wrt addition, subtraction and multiplication (but not division).
You are confused: 2's complement does not necessarily mean modular arithmetic. See, e.g., http://stackoverflow.com/questions/16188263/is-signed-integer-overflow-still-undefined-behavior-in-c -- Alain. -- https://mail.python.org/mailman/listinfo/python-list
