In computing, an arithmetic logic unit (ALU) is a digital circuit that performs arithmetic and logical operations. The ALU is a fundamental building block of the central processing unit of a computer, and even the simplest microprocessors contain one for purposes such as maintaining timers. The processors found inside modern CPUs and graphics processing units (GPUs) accommodate very powerful and very complex ALUs; a single component may contain a number of ALUs.
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There is a special part of the CPU that performs Arithmetic and Logical calculations. Its called Arithmetic Logic Unit ( ALU ).
The ALU (arithmetic logic unit) An ALU loads data from input registres, an external Control Unit then tells the ALU what operation to perform on that data, and then the ALU stores its result into an output register. Other mechanisms move data between these registers and memory.
CPU expands to Central Processing Unit. CPU as a Unit refers to main components interconnected within a Box called Cabinet. Cabinet houses components such as Power Supply, Motherboard, Processor, RAMs, Harddisk Drive & other components as per requirements.Inside CPU on Motherboard with a special designed socket the BRAIN of the Computer lies called Processor/MicroProcessor. The Processor is designed that is fabricated as a single unit comprises of Control Unit & Arithmetic/Logic Unit (ALU).Control Unit executes all Instructions related part whereas ALU performs all Mathematical & Logical Operations.
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