Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In compiler theory, an intrinsic function is a function available for use in a given language whose implementation is handled specially by the compiler. Typically, it substitutes a sequence of automatically-generated instructions for the original function call, similar to an inline function. Unlike an inline function though, the compiler has an intimate knowledge of the intrinsic function and can therefore better integrate it and optimize it for the situation. This is also called builtin function in many languages. Compilers that implement intrinsic functions generally enable them only when the user has requested optimization, falling back to a default implementation provided by the language runtime environment otherwise.

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