NRK <n...@disroot.org> wrote: > On Wed, Jan 05, 2022 at 01:56:26AM +0600, NRK wrote: > > Just curious, why not use: > > > > #if defined(__has_builtin) && __has_builtin(__builtin_expect) > > #define likely(expr) __builtin_expect(!!(expr), 1) > > #define unlikely(expr) __builtin_expect(!!(expr), 0) > > #else > > #define likely(expr) (expr) > > #define unlikely(expr) (expr) > > #endif > > Answering my own question: because it fails if `__has_builtin` is not > defined. I was expecting the 2nd expression wouldn't get evaluated at > all. Should probably take some time and learn more about the > pre-processor sometimes.
Same for me! I didn't know that the C pre-processor doesn't short-circuit ... Thanks for answering your own question! As you can see, it's useful for others as well :) Cheers, Silvan
