Inside Macintosh: PowerPC Numerics / Part 1 - The PowerPC Numerics Environment

Chapter 6 - Numeric Operations and Functions

Auxiliary Functions

The IEEE standard defines a number of recommended functions (called auxiliary functions) that are generally useful in numerical programming. The recommended functions supported by PowerPC Numerics are

• $copysign(x,y)$ : copy the sign
• $fabs(x)$ : absolute value
• $logb(x)$ : binary exponent
• nan functions: NaN generators
• nextafter functions
• $scalb(x)$ : binary scaling

The auxiliary functions are provided in the C library MathLib. For more information about these functions, see Part 2.