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7.2 Additional Builtins for Numeric Operations

GCC provides a large set of built-in functions for operating on GCCs extended set of floating-point and integer types (see Additional Numeric Types). The floating-point builtins include functions for building and testing infinities and NaNs. On integer types, there are additional bit manipulation functions, byte-swapping, and CRC functions.

Many of these builtins are type-generic and can operate on any floating-point or integer operand.

Floating-Point Format Builtins:		Huge values, infinities, and NaNs.
Bit Operation Builtins:		Counting bits and similar functions.
Byte-Swapping Builtins:		Reversing byte order.
CRC Builtins:		Compute cyclic redundancy checks.
Integer Overflow Builtins:		Built-in functions to perform arithmetics and arithmetic overflow checking.