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. 04, 1997
Filed:
Sep. 19, 1995
Hiromichi Yamada, Hadano, JP;
Fumio Murabayashi, Hadano, JP;
Tatsumi Yamauchi, Hitachioota, JP;
Takashi Hotta, Hitachi, JP;
Hideo Sawamoto, Machida, JP;
Takahiro Nishiyama, Sagamihara, JP;
Yoshikazu Kiyoshige, Hadano, JP;
Noriyasu Ido, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
To offer a floating-point addition/subtraction processing apparatus and a method thereof, capable of shortening the computation time, the floating-point calculation processing apparatus includes an approximate shift mount predicting unit for predicting a shift amount for normalization by using the input floating-point data to be addition/subtraction processed within an error of 1 bit, a shift error detecting unit for detecting a difference between the predicted shift amount and a correct shift amount, and an bit shifter for correcting a result, obtained by normalization using the predicted shift amount, by the detected difference of the two shift amounts, wherein a round-off determination and a shift amount calculation are processed in parallel before a normalization shift processing is executed.