A symbolic representation of an ALU and its input and output signals, indicated by arrows pointing into or out of the ALU, respectively. Each arrow represents one or more signals. Control signals enter from the left and status signals exit on the right; data flows from top to bottom.
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Arithmetic logic circuits
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Theory
Binary number
Boolean algebra
Logic gate
Ones' complement number
Two's complement number
Signed number representations
Components
Adder (+)
Adder
Half adder
Full adder
Ripple-carry adder
Carry-lookahead adder
Brent–Kung adder
Kogge–Stone adder
Ling adder
Carry-save adder
Carry-select adder
Carry-skip adder
Adder–subtractor (±)
Adder–subtractor
Subtractor (−)
Subtractor
Full subtractor
Half subtractor
Multiplier (×)
Binary multiplier
Multiplication algorithm
Booth's multiplication algorithm
Wallace tree
Dadda multiplier
Divider (÷)
Binary Divider
Division algorithm
Bitwise ops
Bitwise operation
NOT
AND
OR
Bit shifts
Bit manipulation
See also
Kochanski multiplication (exponentiation)
Multiply–accumulate operation
Categories
Category:Binary arithmetic
Category:Computer arithmetic
See also
FPU
GPU
AGU
Mechanical calculator
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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][3] 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).[4]
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]
^Leadership Education and Training (LET) 2: Programmed Text. Headquarters, Department of the Army. 2001. pp. 371–.
^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.
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