On Mon, Oct 4, 2010 at 9:43 PM, Erik Faye-Lund <kusmabite@xxxxxxxxx> wrote: > +/* > + * Signed integer overflow is undefined in C and some compilers take > + * advantage of this when optimizing, so here's a helper macro to force > + * wrapping when adding two integers. The size to wrap to is taken from > + * the first parameter. > + */ > +#define signed_add_overflows(a, b) \ > + ((b) > ((INTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a))) - (a))) > + *Sigh*, I already see that this comment is out of date (I did a different approach before this one). Sorry, I will fix up this comment for the next round. -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html