Effective digit count on a resultant operand

Details Effective digit count on a resultant operand Effective digit count on a resultant operand

1979-01-02

1980-09-23

Malzahn, David H.

Boots, shoes, and leggings

364711, 364749, 364900, G06F 100, G06F 700, G06F 1300

Patent

active

042246776

ABSTRACT:
In a microprogrammed data processing system, the throughput of the system is increased by apparatus which counts the number of effective digits in an operand which is the result of a decimal numeric instruction being processed by the system. The apparatus receives operand words the operand's least significant word first, in response to a predetermined microword.
The apparatus includes a first register which stores a count of one less than the number of words received; an adder which increments the output of the first register if the word received has a decimal zero in the high order position of the word; and a second register which stores the output of the adder in a word count portion and the number of leading zeros in a digit count portion of the second register. The second register is loaded on the same cycle the word is processed providing the word does not contain all decimal zeros.

REFERENCES:
patent: 3577130 (1971-05-01), Rice et al.
patent: 3749896 (1973-07-01), Munt
patent: 3875386 (1975-04-01), Tsuiki et al.
patent: 4021655 (1977-05-01), Healey
patent: 4090245 (1978-05-01), Hamasaki et al.

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