Momchil Velikov <velco@fadata.bg> writes: >>>>>> "Paul" == Paul Gearon <pag@PISoftware.com> writes: > > Paul> You got me curious, so I checked. With the kernel optimisations of -O2 > Paul> then there's no difference. > > You miss the point. And the point is that that ``x'' (denoting an > expression) is evaluated only once. > > For example, ``y = x++ ?: 2;' is defined, while ``y = x++ ? x : 2;'' > invoked undefined behavior. That's an interesting point. It can't be the reason why the gcc extension is used in this case, though, since it's just an integer, i, and not an arbitrary expression with possible side effects. -- --Ed L Cashin PGP public key: http://noserose.net/e/pgp/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
