Cache bypass control for operand fetches
US4189770A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1978 |
| Grant date | Feb 19, 1980 |
| Priority date | — |
| Expiry date | Mar 16, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0886
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In the case of a cache miss, the successive fetch requests by the I-unit for sublines (e.g. doublewords) of a variable length field operand are provided by the first through the highest-address fetched sublines in a line being accessed from main storage via a cache bypass. This avoids the time delay for the I-unit caused by waiting until the complete line has been transferred to the cache before all required sublines in the line are obtainable from the cache. Address operand pairs (AOP's) consisting of request and buffer registers are provided in the I-unit to handle the fetched sublines as fast as the cache bypass can provide them from main storage. If there is a cache hit, the sublines are accessed from the cache.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.