Central processor with instructions for processing sequences of characters
US4556951A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1984 |
| Grant date | Dec 3, 1985 |
| Priority date | — |
| Expiry date | Jan 5, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/30021
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A central processor for use in a data processing system that is adapted for processing sequences of characters. Information identifying a string of characters to be examined, including the memory location for the first character in the sequence and the total number of characters in the sequence, is placed in working registers of the central processor. Other working registers in the central processor receive information corresponding to a predetermined characteristic, which may be a specific character or information identifying another character string. One of several character string instructions then can be processed. In response to a typical character string instructuion, the central processor retrieves each character from the memory and compares it with the predetermined characteristic. Processing continues until either the predetermined characteristic is detected or all the characters in the character string are examined. During processing, the central processor controls an arithmetic-logic condition code during each comparison. When the processing terminates, the condition code indicates whether the character string contained the predetermined characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.