add_cla.vhd
 This code is used to synthesize the 32 bit adder using Synopsys
  The adder, is used to perform the addition operation in the ALU of the 
 execution stage.This adder adds the two 32 bit values in the buses A and B 
 with the carry-in CI and obtains a 32 bit value in the SUM with a carry-out 
 CO