• Rémi Denis-Courmont's avatar
    likely, unlikely: convenience portability macros for branch prediction · 827b1113
    Rémi Denis-Courmont authored
    Those are the same as the Linux kernel macros, and probably a bunch of
    other projects. Usage:
        if (likely(condition))
        if (unlikely(condition))
    Attention: those two macros convert the predicate to a boolean value.
    Therefore you generally cannot use them for assignments like this:
        void *p_sys = likely (malloc (sizeof (*p_sys)));
        if (!p_sys)
            return VLC_ENOMEM;
    Instead you can do this:
        void *p_sys = malloc (sizeof (*p_sys));
        if (unlikely (!p_sys))
            return VLC_ENOMEM;
vlc_common.h 28.1 KB