function [31:0] log;
      input [127:0] in;
      integer i;
      reg counter;
      begin
        counter = 0;
        for(i=0;i<32;i=i+1)
        begin
          if(in!=0)
            counter = counter+1;
            in = in>>1;
        end
        log = counter;
      end
    endfunction