Adder for exponent arithmetic

Details Adder for exponent arithmetic Adder for exponent arithmetic

G - Physics

06

F

354/197

G06F 7/50 (2006.01) G06F 9/318 (2006.01)

Patent

CA 1161563

-1- ABSTRACT ADDER FOR EXPONENT ARITHMETIC A characteristic adder for use in a data processing system that performs floating-point arithmetic operations is described. A 1's complement subtractive adder is shown for forming the sum or difference of a pair of exponents under control of function control circuitry, along with an indication of which characteristic is larger for selecting which mantissa operand should be shifted for proper alignment. The function control circuitry responds to function signals to select addition or subtraction, provide the magnitude or complement of the results, and select between two available floating-point formats. Characteristic Overflow and Underflow is tested and signaled for each of the two possible floating-point formats.

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