Single Precision Floating Point Binary addition/subtraction Process:

• Step #1: Extract sign bits SignA and SignB
• Step #2: Extract mantissa bits MantA and MantB
• Step #3:
  • Extract exponent ExpA and ExpB
  • Find the absolute difference ExpDiff = |ExpA - ExpB|
  • Select Exponent of greater number
• Step #4: Shift mantissa of number with smaller exponent towards right
• Step #5: Do add/sub operation on mantissa considering the hidden bit
• Step #6: Normalizing the output
  • Operation = add
    • carryOut = 1 then
      • result = result >> 1
        • exponent = exponent + 1;
  • Operation = sub
    • check for leading zeros
      • left shift result till first 1 is obtained
        • exponent = exponent - number of leading zeros