Decimal arithmetic apparatus and method

Details Decimal arithmetic apparatus and method Decimal arithmetic apparatus and method

1996-04-26

1998-04-28

Malzahn, David H.

Boots, shoes, and leggings

364783, G06F 752

Patent

active

057453993

ABSTRACT:
An apparatus for adding two BCD numbers, avoids the need for special adders with detection of carries between BCD digits. First, a sum without carries is generated, by forming the binary sum of the two numbers and an all-sixes pattern, without any carries between BCD digits. Next, a sum with carries is generated, by forming the binary sum of the two numbers and an all-sixes pattern, with carries between BCD digits. A mask pattern is then generated, comprising a six in each BCD digit where the sum without carries is unequal to the sum with carries. A result is then generated by forming the binary sum of the two numbers and the mask pattern, with carries between BCD digits.

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patent: 5146423 (1992-09-01), Fischer et al.
patent: 5673216 (1997-09-01), Kelley et al.
Chroust, "A Note on Implementable Decimal Arithmetic Algorithms" Microprocessing and Microprogramming, vol. 22, No. 1, Jan. 1988, pp. 75-77 .

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