The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 1997
Filed:
Jun. 16, 1995
David William Matula, Dallas, TX (US);
Cyrix Corporation, Richardson, TX (US);
Abstract
A system for the early detection of overflow or exceptional quotient/remainder pairs is used in conjunction with performing nonrestoring division using two's complement 2n bit dividends N and two's complement n bit divisors D--if early overflow is not signaled, and if an exceptional quotient/remainder pair is not detected, a quotient Q and remainder R are obtained by successive iterative partial remainder computations, which may be performed with no possibility of overflow. The detection system uses only the divisor, dividend, and first partial remainder. Early overflow detection uses three tests (FIGS. 2a, 2b, 2c): an exceptional divisor test, an exceptional dividend test, and an exceptional quotient test. Early exceptional quotient/remainder pair detection provides, when overflow is not signaled, exceptional quotient/remainder pairs using the exceptional divisor test for the exceptional divisor -2.sup.n-1 (FIG. 2c) and the exceptional quotient test for the exceptional quotient -2.sup.n-1 (FIG. 2b).