28.2 Built-In Function Descriptions

This section describes the programmer interface to the compiler built-in functions.

The functions described in this section are “built in” and do not require a header file; however, we provide a file <builtins.h> that can be included to provide readable prototypes of these functions.

Also, there are no command-line switches associated with the built-in functions – they are always available. The built-in function names are chosen such that they belong to the compiler’s namespace (they all have the prefix __builtin_), so they will not conflict with function or variable names in the programmer’s namespace.