Computer ArchitectureComputer Science

Explain Shift Micro Operations.

Shift Micro Operations  

Shift microoperations are used for serial transfer of data and are used in conjunction with arithmetic and logic operations.

The register contents can be shifted to the left or to the right.

There are three types of shift operations:

  • Logical shifts transfers 0 through the serial input, with all the bits involved in the shifting.
  • Arithmetic shifts multiplies (or divides) a signed number by 2.
  • Circular shifts circulate the bits of the register around the two ends with  no loss of information.

Arithmetic Logic Shift Unit

Instead of having individual registers performing the various microoperations, computers use an Arithmetic Logic Unit which combines these functions.

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