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

Chapter 5 - Conversions

Rounding Floating-Point Numbers to Integers

PowerPC Numerics can also round floating-point numbers to integers and leave them stored in the same floating-point data format. These conversions may round in the current rounding direction, or they may explicitly round upward, downward, to the nearest value, or toward zero. These operations do not affect zeros, NaNs, or Infinities, because these three types of special values are already considered integers.