Function Context Structures
Some Intel IPP functions use special structures to store function-specific (context) information. For example, the
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
in their names
state structures that are modified during operation; they have the suffix
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.