Method and apparatus for signed and unsigned bounds check
US4584666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1984 |
| Grant date | Apr 22, 1986 |
| Priority date | — |
| Expiry date | Jun 21, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F7/026
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A typical feature of a data processor is a bounds check. A bounds check is achieved when a determination is made as to whether a check value, typically an address or datum, is within predetermined bounds. Such check values may be signed or unsigned. By requiring that the upper bound be numerically larger than the lower bound for doing a signed check, and requiring that the upper bound be logically larger than the lower bound for doing an unsigned check, the bounds check is performed by the data processor without the need of receiving a signal which informs the data processor in advance as to whether the check is to be signed or unsigned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.