# Arithmetic logic unit

## Combinational digital circuit / From Wikipedia, the free encyclopedia

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In computing, an **arithmetic logic unit** (**ALU**) is a combinational digital circuit that performs arithmetic and bitwise operations on integer binary numbers.^{[1]}^{[2]} This is in contrast to a floating-point unit (FPU), which operates on floating point numbers. It is a fundamental building block of many types of computing circuits, including the central processing unit (CPU) of computers, FPUs, and graphics processing units (GPUs).^{[3]}

The inputs to an ALU are the data to be operated on, called operands, and a code indicating the operation to be performed; the ALU's output is the result of the performed operation. In many designs, the ALU also has status inputs or outputs, or both, which convey information about a previous operation or the current operation, respectively, between the ALU and external status registers.