12.1 Built-In Functions

Built-in functions give the C programmer access to assembler operators or machine instructions that are currently only accessible using inline assembly, but are sufficiently useful that they are applicable to a broad range of applications. Built-in functions are coded in C source files syntactically like function calls, but they are compiled to assembly code that directly implements the function and usually do not involve function calls or library routines.

For more on built-in functions, see the 28 Built-in Functions section.