Accelerated reversal of speculative state changes and resource recovery
US9575763B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2013 |
| Grant date | Feb 21, 2017 |
| Priority date | — |
| Expiry date | Apr 13, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/3861
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method includes undoing, in reverse program order, changes in a state of a processing device caused by speculative instructions previously dispatched for execution in the processing device and concurrently deallocating resources previously allocated to the speculative instructions in response to interruption of dispatch of instructions due to a flush of the speculative instructions. A processor device comprises a retire queue to store entries for instructions that are awaiting retirement and a finite state machine. The finite state machine is to interrupt dispatch of instructions in response to a flush of speculative instructions previously dispatched for execution in the processing device and to undo, in reverse program order, changes in a state of the processing device caused by the speculative instructions while concurrently deallocating resources previously allocated to the speculative instructions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.