Method and apparatus for exact leading zero prediction for a flo

Details Method and apparatus for exact leading zero prediction for a flo Method and apparatus for exact leading zero prediction for a flo

1991-08-30

1993-04-20

Malzahn, David H.

Boots, shoes, and leggings

364748, G06F 738, G06F 750

Patent

active

052048250

ABSTRACT:
A leading zero predictor (LZP) in parallel with the full subtraction operation correctly predicts the exact number of leading zeros of a subtraction result. Once the full subtraction operation is completed, the necessary shifts may be performed immediately, without a delay to determine the presence of leading zeros, and without need for a normalization corrector.

REFERENCES:
patent: 4922446 (1990-05-01), Zurawski et al.
patent: 4926369 (1990-05-01), Hokenek et al.
patent: 5010508 (1991-04-01), Sit et al.
patent: 5075882 (1991-12-01), Sakai et al.
Weitek 4167 Floating-Point Coprocessor Advanced Data Sheet, Weitek Corporation, Jul. 1989, pp. 1-28.
Hokenek and Montoye, "Leading-Zero Anticipator (LZA) in the IBM RISC System/6000 Floating-Point Execution Unit", IBM J. Res. Devel., vol. 34, No. 1, Jan. 1990, pp. 71-77.
Steiss et al., "A 65MHz Floating-Point Coprocessor for a RISC Processor", 1991 IEEE International Solid-State Circuits Conference, Mar. 1991, Session 5, Paper TA 5.3. pp 94-95.

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