Arithmetic unit for use in data processing systems

Details Arithmetic unit for use in data processing systems Arithmetic unit for use in data processing systems

G - Physics

06

F

354/149

G06F 7/48 (2006.01) G06F 7/52 (2006.01) G06F 7/57 (2006.01)

Patent

CA 1175572

ARITHMETIC UNIT FOR USE IN DATA PROCESSING SYSTEMS Abstract of the Invention A data processing system using unique procedures for handling var- ious arithmetic operations. Thus, in floating point arithmetic mantissa cal- culations 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 effect- ively 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 tech- nique 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.

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