Intel® Integrated Performance Primitives Developer Reference

Developer Reference

  • 2020
  • 07/15/2020
  • Public Content
Contents

Function Context Structures

Some Intel IPP functions use special structures to store function-specific (context) information. For example, the
IppsFFTSpec
 structure stores twiddle factors and bit reverse indexes needed in the fast Fourier transform.
Two different kinds of structures are used:
  • specification structures that are not modified during function operation; they have the suffix
    Spec
     in their names
  • state structures that are modified during operation; they have the suffix
    State
     in their names.
The function context interpretation is processor dependent. Therefore, these context-related structures are not defined in the public headers, and their fields are not accessible. Intel IPP provides no option of modifying these structures or creating a function context as an automatic variable.

Product and Performance Information

1

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