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Shifting a register content to left by one bit position is equivalent to:

  1. Division by two.
  2. Addition by two.
  3. Multiplication by two.
  4. Subtraction by two.
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Shifting a register content to left by one bit position is equivalent to Multiplied by 2.

i.e. 0100 = 4  Now shift bit left by 1 bit = 1000= 8 i.e. 4 $\times$ 2 = 8
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