Random832 <random...@fastmail.com>:
> On Sat, Aug 20, 2016, at 03:50, Marko Rauhamaa wrote:
>> 2'scomplement arithmetics is quite often taken advantage of in C
>> programming. Unfortunately, with the castration of signed integers
>> with the most recent C standards, 2's-complement has been dangerously
>> broken.
>
> No part of any version of the C standard has ever allowed signed
> integer overflow to work as defined behavior the way a generation of
> programmers assumed it did.
Standard or no, it was widely taken advantage of and very useful.
> What changed was advances in compiler optimization technology, not a
> standards change.
I wonder how much is gained by those optimizations. The loss to code
quality is significant. What C standards have done is they have all but
deprecated the use of signed integers. If you have to do integer
arithmetics, cast everything into unsigned first.
I think it's terrible that in C,
x + y + z
might not yield
x + y + z
even if all of
{ x, y, z, x + y + z }
are inside the valid signed integer range.
Marko
--
https://mail.python.org/mailman/listinfo/python-list
