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ippStsResFloor
Intel IPP result values were floored identifies a scoped API or runtime boundary rather than a general machine failure. The operation completed but one or more results were rounded downward/floored according to the primitive and data type.
First returning layer
Intel IPP assigns meaning to the sign of IppStatus: negative is error, zero is clean completion, and positive is warning with potentially usable output. Output validation is therefore inseparable from status handling.
Intel IPP uses negative values for errors, zero for no warning/error, and positive values for warnings that can accompany completed output. Do not treat every nonzero status as an aborted operation. Keep the numeric value, declared return type, and first returning operation together with ippStsResFloor; the same integer can belong to a different status namespace in another API.
Evidence map
| Capture | Diagnostic value |
|---|---|
| Function variant, source/destination type, scale factor, rounding mode, input range, and affected sample indices. | Identifies the concrete object and operation associated with Intel IPP result values were floored. |
| IppStatus sign and value interpreted using the same IPP headers as the linked library. | Separates argument or lifecycle state from the provider beneath the returned IppStatus. |
| Output-buffer state and checksum before and after the call. | Creates a stable before-and-after comparison. |
| Reference result or invariant appropriate to the primitive domain. | Shows whether the captured IppStatus is the first result or a translated summary. |
Preserve function variant, source/destination type, scale factor, rounding mode, input range, and affected sample indices before reinstalling, rebooting, clearing state, or substituting another device or provider. A success observed only after such a change is useful comparison data, but it does not identify the original cause.
Change one condition at a time
- Compare against a floating-point or higher-precision reference. Keep unrelated inputs fixed so the change remains attributable to the returned status.
- Run one boundary input and one known-good control without changing dispatch/library version. Record the first returned status and any state transition observed.
- Check the status immediately; IPP does not preserve a global last-status value. Treat a changed result as a new boundary rather than automatic resolution.
Decision points
| Observed comparison | Next conclusion to test |
|---|---|
| The first control changes the result | Concentrate on the variable isolated by this check: Compare against a floating-point or higher-precision reference. |
| The second comparison reproduces the same first status | Preserve lower-layer provider, driver, service, or runtime evidence before editing application data. The second controlled check was: Run one boundary input and one known-good control without changing dispatch/library version. |
| A different status appears after the bounded change | The operation moved to another boundary after the third controlled check. That check was: Check the status immediately; IPP does not preserve a global last-status value. Retain both results and interpret the replacement through its own API contract. |
Repair and regression test
Targeted correction. Choose a suitable data type/scale or accept documented flooring while testing its numerical error budget. Modify only the object, argument, policy, provider, or lifecycle state identified by the collected evidence.
Acceptance criterion. Maximum flooring error stays within the application tolerance across boundary values. Re-run the original operation that produced the original warning under its original identity and supported configuration, then keep one negative control that still produces the expected neighboring outcome.
Technical references
References for ippStsResFloor on the deployed platform version.
- Intel: Integrated Performance Primitives product and documentation — defines the status namespace used.
- Intel IPP developer guide — documents the API or lifecycle boundary for the returned IppStatus.
- Intel IPP error-reporting reference — provides ABI, implementation, or protocol context.
- AllStat source record: Intel ippdefs.h semantics — supports the portability and verification limits.
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