ARITHMETIC UNIT FOR USE IN DATA PROCESSING SYSTEMS

ARITHMETIC UNIT FOR USE IN DATA PROCESSING SYSTEMS of the Invention A data processing system using unique procedures for handling various arithmetic operations. Thus, in floating point arithmetic mantissa calculations the system uses a novel technique for inserting a round bit into the appropriate b...

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Bibliographic Details
Main Authors ROSEN, JOSH, BLAU, JONATHAN S
Format Patent
LanguageEnglish
French
Published 02.10.1984
Edition3
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:ARITHMETIC UNIT FOR USE IN DATA PROCESSING SYSTEMS of the Invention A data processing system using unique procedures for handling various arithmetic operations. Thus, in floating point arithmetic mantissa calculations the system uses a novel technique for inserting a round bit into the appropriate bit of the floating point result wherein a look-ahead carry bit generator stage is used for such purpose to reduce the overall mantissa calculation time. Further, the system utilizes unique logic which operates in parallel with the floating point exponent calculation logic for effectively predicting whether or not an overflow or underflow condition will be present in the final exponent result and for informing the system which such conditions have occurred. Moreover, the system utilizes a simplified technique for computing the extension bits which are required in multiply and divide computations wherein a programmable array logic unit and a four-bit adder unit are combined for such purposes.
Bibliography:Application Number: CA19820401467