ADDER-SUBTRACTOR CIRCUIT AND METHOD OF CONTROLLING ADDER-SUBTRACTOR CIRCUIT

摘要

An adder-subtractor circuit includes an inverting circuit configured to invert a first operand on a bit-by-bit basis to output a first inverted operand, a circuit having a function to perform a predetermined arithmetic operation and configured to output a second operand, a carry generating circuit configured to generate carries from the first inverted operand and the second operand, and an XOR circuit configured to perform a bit-by-bit XOR on the carries, the first operand, and the second operand.