Calculating selected sign 3 expression in a single instruction c

Details Calculating selected sign 3 expression in a single instruction c Calculating selected sign 3 expression in a single instruction c

1996-09-24

1998-11-10

Elmore, Reba I.

Boots, shoes, and leggings

36478401, G06F 750

Patent

active

058353941

ABSTRACT:
A selected one of the expressions 2A+sign(A), 2A-sign(A), A+sign(A), and A-sign(A) is calculated, where A is a signed binary integer represented in 2's complement form, sign(A) is equal to one when A is greater than zero, sign(A) is equal to zero when A is zero, and sign(A) is equal to negative one when A is less than zero. Advantageously, the selected sign 3 expression can be calculated by a general purpose computer in a single instruction cycle.

REFERENCES:
patent: 4218751 (1980-08-01), McManigal
patent: 4709226 (1987-11-01), Christopher
patent: 4953115 (1990-08-01), Kanoh
patent: 5267187 (1993-11-01), Hsieh et al.
patent: 5373459 (1994-12-01), Taniguchi
patent: 5574671 (1996-11-01), Young et al.
U.S. application No. 08/658,454, filed Jun. 5, 1996, entitled "Zero Detect for Binary Sum" by R. Wong.
U.S. application No. 08/695,142, filed Aug. 8, 1996, entitled "Zero Detect for Binary Difference" by R. Wong.

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