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Scalar processor

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Title: Scalar processor  
Author: World Heritage Encyclopedia
Language: English
Subject: Vector processor, Superscalar processor, Central processing unit, Chaining (vector processing), R4000
Collection: Central Processing Unit
Publisher: World Heritage Encyclopedia

Scalar processor

Scalar processors represent a class of computer processors. A scalar processor processes only one datum at a time, with typical data items being integers or floating point numbers).[1] A scalar processor is classified as a SISD processor (Single Instructions, Single Data) in Flynn's taxonomy.


In contrast, in a vector processor a single instruction operates simultaneously on multiple data items (referred to as "SIMD"). The difference is analogous to the difference between scalar and vector arithmetic.

A superscalar processor, on the other hand, executes more than one instruction during a clock cycle by simultaneously dispatching multiple instructions to redundant functional units on the processor. Each functional unit is not a separate CPU core but an execution resource within a single CPU such as an arithmetic logic unit, a bit shifter, or a multiplier.[1]

See also


  1. ^ a b Advanced Microprocessors and Interfacing by Badri Ram 2000 ISBN 0-07-043448-4 page 11

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