A special operand generator circuit 22 is provided at the output of the arithmetic section 14 for determining whether or not the result of the arithmetic operation performed in the arithmetic section 14 is a special operand value, and which operand value the result equals.
Likewise, if the first operand is to be subtracted from the second operand and the second operand is the zero valued special operand, the result must have a magnitude and exponent that equal the magnitude and exponent of the first operand and a sign of opposite polarity as the second operand.
For instance, two ordinary operands are added (subtracted) by normalizing the operand with the smaller exponent relative to the operand with the larger exponent, adding (subtracting) the magnitudes of the two operands, e.g., using a carry look-ahead or carry save adder, and then normalizing the result.
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