Bit Shifter

Description:

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Logical Shifter:

• fills the empty space with 0
• Shift left: A >> 2
• Shift right: A << 2

Arithmetic Shifter:

• Fill the empty space with the most MSB
• Shift left: 11001 >> 2 = 11110
  • In two’s complement, if it negative, it keeps the same value by adding 1; if possible, add 0 in front
• shift right: 11001 << 2 = 00100
  • add 0 from the back

Rotator Shifter:

• Rotate like a queue
  • 
• The selector decides how many bits are shifted and which bit to replace it
• Can be used as multiplier and divider