Intel IPP status 51 (ippStsFeaturesCombination): meaning

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: IPP rejected the supplied combination of CPU feature selectors.

Could be also:
Constant	Type	OS
ERROR_REM_NOT_LIST	Win32 error	Windows
KERN_POLICY_STATIC	Kern return	Mac
EL2HLT	errno	Linux
ENETUNREACH	errno	Mac
EBADR	errno	Solaris
UNEXPECTED_INITIALIZATION_CALL	BugCheck Code	Windows

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ippStsUnknownFeature	ippStsNotSupportedModeErr

ippStsFeaturesCombination

This warning means individual feature selectors may be known, but the set is inconsistent or unsupported as a combination for dispatch control.

It is relevant to tests and benchmark harnesses that force specific CPU paths. A feature set that cannot exist together on a real processor should not be used to select an optimized implementation.

Diagnostic focus

Validate feature masks against the actual CPUID feature set.
Avoid constructing combinations by OR-ing flags from different CPU generations without constraints.
Prefer automatic dispatch unless a reproducible benchmark or diagnostic requires a forced path.

IPP CPU feature functions · Intel IPP CPU dispatching

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