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:
May. 27, 1986
Filed:
Feb. 12, 1985
Yoshimune Hagiwara, Kodaira, JP;
Shizuo Sugiyama, Kodaira, JP;
Narimichi Maeda, Tachikawa, JP;
Osamu Yumoto, Kokubunji, JP;
Takashi Akazawa, Kodaira, JP;
Masahito Kobayashi, Yokohama, JP;
Yasuhiro Kita, Hachioji, JP;
Yuzo Kita, Fuchu, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Denshi Kabushiki Kaisha, Tokyo, JP;
Abstract
In an adder for floating point data, two floating point data are adjusted so that the exponent parts have the same value and the resulting adjusted mantissa parts are added. A first shift signal is generated on the basis of the result of the added mantissa parts and having a value necessary for normalization of the addition result, and a second shift signal is generated having a value equal to the difference between the adjusted exponent part of the floating point data and a minimum value predetermined for an exponent of any floating point data at which underflow occurs. The result of addition of the adjusted mantissa parts is shifted on the basis of said second shift signal or said first shift signal depending on whether or not an underflow occurs.