Preventing operations which cause overflow in an arithmetic and logic unit

摘要

An arrangement 10 for detecting an incorrect result produced by division in a computer ALU 12 including apparatus 17 for storing the sign of a dividend, apparatus 18 for storing the sign of a divisor, apparatus for utilizing the sign of the dividend a and the sign of the divisor to indicate an expected sign for a quotient, apparatus 20 for detecting the sign of a quotient produced by the division of the dividend by the divisor, apparatus 27 for comparing the expected sign of the quotient with the actual sign of the quotient, and apparatus for aborting the division operation if the compared signs differ. IMAGE