Data processing system and method for capturing history buffer data
US6070235A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1997 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Jul 14, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/3858
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processing system includes logic to ensure result data stored in a history buffer is in a correct chronological order and is not overwritten until an appropriate point in time. The logic also ensures that the history buffer is able to capture result data that is produced with unexpected delays. The history buffer entries act as a "backup" for an architected register by storing older result data and rely on unique target identifiers assigned to dispatched instructions to keep the result data in a correct chronological order. Furthermore, a target identifier field of the architected register holds the latest target identifier assigned to a youngest instruction that modifies the architected register. Additionally, previous result data in the register is backed up in an allocated history buffer entry. If the result data is not yet available, the target identifier in the register will be deposited in the target identifier field of the history buffer entry. One timing cycle before a result data value is expected to be available, a target identifier assigned to the instruction producing the data is broadcast on the Result bus. If the result data is delayed at a next timing cycle, a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.