[PATCH] Document arithmetic overflow semantics

[Florian Weimer]

kenner@vlsi1.ultra.nyu.edu (Richard Kenner) writes:

> behavior.    I have three major problems with it:
>
> (1) It removes the potential of optimizations that assume such overflow cannot
>     occur in languages where it is undefined (C, C++, and Ada).

The last time I asked, I was told that GCC already does not check in
some cases if arithmetic overflow can occur and still performs some
optimizations which assume that no overflow occurs.