HelenOS sources

_likely           236 common/str.c   #define _likely(expr) __builtin_expect((expr), true)
_likely           236 kernel/generic/common/str.c #define _likely(expr) __builtin_expect((expr), true)
_likely           236 uspace/lib/c/common/str.c #define _likely(expr) __builtin_expect((expr), true)