ClickHouse/base/common/likely.h

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#if defined(_MSC_VER)
# if !defined(likely)
# define likely(x) (x)
# endif
# if !defined(unlikely)
# define unlikely(x) (x)
# endif
#else
# if !defined(likely)
# define likely(x) (__builtin_expect(!!(x), 1))
# endif
# if !defined(unlikely)
# define unlikely(x) (__builtin_expect(!!(x), 0))
# endif
#endif