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:
Nov. 29, 2011
Filed:
Dec. 31, 2007
Marius Cornea-hasegan, Portland, OR (US);
Marius Cornea-Hasegan, Portland, OR (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
Methods and arrangements to correct for double rounding errors when rounding floating point numbers to nearest even are described. Embodiments include transformations, code, state machines or other logic to perform a floating point operation on one or more floating point numbers of precision Pin base b, producing positive result resof precision greater than precision P; rounding positive result resto precision Pto the nearest even, producing positive result res; and rounding the result resto precision Pto the nearest even, where Pis narrower than P, producing result res. The embodiments may also include correcting resfor double rounding errors. The correcting may include determining that resis midway between two consecutive floating point numbers of precision P, the larger (smaller) being res, determining that rounding resto produce resinvolved rounding up (down), and decrementing (incrementing) the significand of resto obtain the corrected result res
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