Age tracking for independent pipelines
US11422821B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2018 |
| Grant date | Aug 23, 2022 |
| Priority date | — |
| Expiry date | Nov 19, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/3889
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method for efficiently handling instruction execution ordering. In various embodiments, a processor includes multiple execution lanes, each executing instructions of a particular type, which are not executed by one or more of the other execution lanes. The instruction queue includes one queue for each particular execution lane. Control logic identifies a current youngest age used in allocated entries of the multiple queues, and determines a starting age based on the identified current youngest age and the number of instructions to be issued. Beginning with the determined starting age, ages (in program order) are assigned to a group of instructions being allocated in the multiple queues. Ages of entries in the multiple queues are updated for instructions not being issued based on the number of instructions being issued. Instructions being issued have age differences between them below a threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.