Central processor with instructions for processing sequences of

Details Central processor with instructions for processing sequences of Central processor with instructions for processing sequences of

1984-01-05

1985-12-03

Chan, Eddie P.

Boots, shoes, and leggings

382 40, G06F 734

Patent

active

045569517

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.

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IBM System/360 Principles of Operation Manual, 1964, pp. 15 and 24.
Microcomputer Handbook, Digital Equip. Corp., 1977.

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