Subtraction in binary can be implemented by adding the 1's complement, and ignoring the overflow flag. Thus there is no need for a separate subtraction function if addition and 1's complement are available.
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The arithmetic logic unit or ALU performs arithmetic, logic, and integer operations. ALU was created by mathematician John von Neumann in 1945.
The arithmentic logic unit (ALU) and the control unit are located inside the central processing unit (CPU).
the arithmetic logic unit
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ALU, the Arithmetic Logic Unit.