High performance adder using carry predictions

Details High performance adder using carry predictions High performance adder using carry predictions

1990-01-09

1992-03-17

Malzahn, David H.

Boots, shoes, and leggings

364766, G06F 750, G06F 752

Patent

active

050974360

ABSTRACT:
A high performance adder is provided including a predicted carry look ahead coupled between a lower order adder and a higher order adder of the high performance adder. The predicted carry look ahead provides as an input to the carry input of the adder a prediction of a carry bit produced by the adding of lower order bits of two addends by the lower order adder. By this arrangement, the highest order adder can operate on the highest order bits of two addends with a predicted carry and without having to wait for the results of the carries that occur in the lower order bits.

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"Pipelined Carry-Lookahead Adder for Fixed-Point Arithmetic", IBM Tech. Disclosure Bulletin, vol. 28, No. 9 Feb. 1986 pp. 4106-4108.

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