Developer Reference

  • 2020
  • 07/15/2020
  • Public Content

Rounding Mode

General signal processing functions use rounding. The default rounding mode is
nearest even
, that is the fixed point number
+ α, 0 ≤ α < 1, where
is an integer number, is rounded as given by:
For example, 1.5 will be rounded to 2 and 2.5 to 2.
Some functions have additional rounding modes, which are set by the parameter
  • Functions for data compression, data integrity, string processing and fixed-accuracy arithmetic do not perform rounding.

Product and Performance Information


Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804