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In this video you will learn Arithmetic & Logic Unit (ALU)....!!!
What is ALU (Arithmetic Logic Unit)?
In the computer system, ALU is a main component of the central processing unit, which stands for arithmetic logic unit and performs arithmetic and logic operations. It is also known as an integer unit (IU) that is an integrated circuit within a CPU or GPU, which is the last component to perform calculations in the processor. It has the ability to perform all processes related to arithmetic and logic operations such as addition, subtraction, and shifting operations, including Boolean comparisons (XOR, OR, AND, and NOT operations). Also, binary numbers can accomplish mathematical and bitwise operations. The arithmetic logic unit is split into AU (arithmetic unit) and LU (logic unit). The operands and code used by the ALU tell it which operations have to perform according to input data. When the ALU completes the processing of input, the information is sent to the computer's memory.
Except performing calculations related to addition and subtraction, ALUs handle the multiplication of two integers as they are designed to execute integer calculations; hence, its result is also an integer. However, division operations commonly may not be performed by ALU as division operations may produce a result in a floating-point number. Instead, the floating-point unit (FPU) usually handles the division operations; other non-integer calculations can also be performed by FPU.
Additionally, engineers can design the ALU to perform any type of operation. However, ALU becomes more costly as the operations become more complex because ALU destroys more heat and takes up more space in the CPU. This is the reason to make powerful ALU by engineers, which provides the surety that the CPU is fast and powerful as well.
The calculations needed by the CPU are handled by the arithmetic logic unit (ALU); most of the operations among them are logical in nature. If the CPU is made more powerful, which is made on the basis of the ALU is designed. Then it creates more heat and takes more power or energy. Therefore, it must be moderation between how complex and powerful ALU is and not be more costly. This is the main reason the faster CPUs are more costly; hence, they take much power and destroy more heat. Arithmetic and logic operations are the main operations that are performed by the ALU; it also performs bit-shifting operations.
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