Allocation filter for prediction storage structure
US11586944B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2019 |
| Grant date | Feb 21, 2023 |
| Priority date | — |
| Expiry date | Sep 16, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/602
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus comprises: a prediction storage structure comprising a plurality of prediction state entries representing instances of predicted instruction behaviour; prediction training circuitry to perform a training operation to train the prediction state entries based on actual instruction behaviour; prediction circuitry to output at least one control signal for triggering a speculative operation based on the predicted instruction behaviour represented by a prediction state entry for which the training operation has provided sufficient confidence in the predicted instruction behaviour; an allocation filter comprising at least one allocation filter entry representing a failed predicted instruction behaviour for which the training operation failed to provide said sufficient confidence; and prediction allocation circuitry to prevent allocation of a new entry in the prediction storage structure for a failed predicted instruction behaviour represented by an allocation filter entry of the allocation filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.