Arithmetic logic unit

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.

^ Atul P. Godse; Deepali A. Godse (2009). "3". Digital Logic Design. Technical Publications. pp. 9–3. ISBN 978-81-8431-738-1.^{[permanent dead link]}
^ Atul P. Godse; Deepali A. Godse (2009). "Appendix". Digital Logic Circuits. Technical Publications. pp. C–1. ISBN 978-81-8431-650-6.^{[permanent dead link]}
^ "1. An Introduction to Computer Architecture - Designing Embedded Hardware, 2nd Edition [Book]". www.oreilly.com. Retrieved 2020-09-03.

[A.P.GodseD.A.Godse2009-1] Atul P. Godse; Deepali A. Godse (2009). "3". Digital Logic Design. Technical Publications. pp. 9–3. ISBN 978-81-8431-738-1.^{[permanent dead link]}

[A.P.GodseD.A.Godse2009-2-2] Atul P. Godse; Deepali A. Godse (2009). "Appendix". Digital Logic Circuits. Technical Publications. pp. C–1. ISBN 978-81-8431-650-6.^{[permanent dead link]}

[3] "1. An Introduction to Computer Architecture - Designing Embedded Hardware, 2nd Edition [Book]". www.oreilly.com. Retrieved 2020-09-03.

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