Methods and apparatus for performing fast division operations in

Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed

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G06F 752

Patent

active

061381373

ABSTRACT:
Methods and apparatus for quickly dividing multiple-bit operands using bit-serial processors include strategies for eliminating the number of steps required to execute conventional division operations. According to an exemplary embodiment, a conditional subtraction step, based on a quotient bit computed during a given pass, is combined with a compare step which is used to compute a next quotient bit and which, according to conventional techniques, is ordinarily computed during a subsequent pass. Additionally, exemplary embodiments provide a zero
on-zero mask for denominator bits which extend beyond a current most significant remainder bit during a given pass. As a result, not all denominator bits need be considered during every pass. Advantageously, the methods and apparatus of the invention can provide approximately a 3 to 1 speed improvement as compared to conventional techniques.

REFERENCES:
patent: 3816733 (1974-06-01), Sather
patent: 5771182 (1998-06-01), Baker et al.
patent: 5946223 (1999-08-01), Nakajima

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