[cfe-dev] [RFC] Introduce overflow builtins

[Joerg Sonnenberger]

On Thu, Mar 22, 2012 at 05:41:18PM -0700, Eli Friedman wrote:
> Assuming the point of these builtins is primarily performance of
> library implementations (since most projects would need some sort of
> fallback for compilers which don't provide this builtin), I'm not sure
> it makes sense to have div/rem at all; there isn't any underlying
> llvm.div.with.overflow to map it to...

Signed division can overflow (INT_MIN / -1). There is also the question
of division by 0. It seems natural to consider it as overflow in which
case both div and rem make sense.

Joerg