Marking long latency instruction as branch in pending instruction table and handle as mis-predicted branch upon interrupting event to return to checkpointed state
US9513925B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2013 |
| Grant date | Dec 6, 2016 |
| Priority date | — |
| Expiry date | Nov 14, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/3863
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processing apparatus and method of data processing are provided. The data processing apparatus comprises execution circuitry configured to execute a sequence of program instructions. Checkpoint circuitry is configured to identify an instance of a predetermined type of instruction in the sequence of program instructions and to store checkpoint information associated with that instance. The checkpoint information identifies a state of the data processing apparatus prior to execution of that instance of the predetermined type of instruction, wherein the predetermined type of instruction has an expected long completion latency. If the execution circuitry does not complete execution of that instance of the predetermined type of instruction due to occurrence of a predetermined event, the data processing apparatus is arranged to reinstate the state of the data processing apparatus with reference to the checkpoint information, such that the execution circuitry is then configured to recommence execution of the sequence of program instructions at that instance of the predetermined type of instruction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.