ippSetDenormAreZeros

Enables or disables denormals-are-zero mode.

Syntax

IppStatus ippSetDenormAreZeros(int value);

Parameters

value

Switch to set or clear the corresponding bit of the MXCSR register.

Description

The function ippSetDenormAreZeros is declared in the ippcore.h file. This function enables (when the value is not equal to 0) or disables (when the value is equal to 0) the denormals-are-zero (DAZ) mode of processors that support Streaming SIMD Extensions (SSE) instructions. The DAZ mode controls the processor response to a SIMD floating-point denormal operand condition. When the DAZ flag is set, the processor converts all denormal source operands to zero with the sign of the original operand before performing any computations on source data. The DAZ mode is provided to improve processor performance for applications such as streaming media processing, where rounding a denormal operand to zero does not noticeably affect the quality of the processed data.

Return Values

ippStsNoErr	Indicates no error.
ippStsCpuNotSupportedErr	Indicates an error condition when the DAZ mode is not supported by the processor.

Optimization Notice
The Intel® Integrated Performance Primitives (Intel® IPP) library contains functions that are more highly optimized for Intel microprocessors than for other microprocessors. While the functions in the Intel® IPP library offer optimizations for both Intel and Intel-compatible microprocessors, depending on your code and other factors, you will likely get extra performance on Intel microprocessors. While the paragraph above describes the basic optimization approach for the Intel® IPP library as a whole, the library may or may not be optimized to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include Intel® Streaming SIMD Extensions 2 (Intel® SSE2), Intel® Streaming SIMD Extensions 3 (Intel® SSE3), and Supplemental Streaming SIMD Extensions 3 (Intel® 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. Intel recommends that you evaluate other library products to determine which best meets your requirements.

Optimization Notice

The Intel® Integrated Performance Primitives (Intel® IPP) library contains functions that are more highly optimized for Intel microprocessors than for other microprocessors. While the functions in the Intel® IPP library offer optimizations for both Intel and Intel-compatible microprocessors, depending on your code and other factors, you will likely get extra performance on Intel microprocessors.

While the paragraph above describes the basic optimization approach for the Intel® IPP library as a whole, the library may or may not be optimized to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include Intel® Streaming SIMD Extensions 2 (Intel® SSE2), Intel® Streaming SIMD Extensions 3 (Intel® SSE3), and Supplemental Streaming SIMD Extensions 3 (Intel® 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.

Intel recommends that you evaluate other library products to determine which best meets your requirements.