module while_example();

reg [5:0] loc;
reg [7:0] data;

always @ (data or loc)
begin
  loc = 0;
  // If Data is 0, then loc is 32 (invalid value)
  if (data == 0) begin
    loc = 32;
  end else begin
    while (data[0] == 0) begin
      loc = loc + 1;
      data = data >> 1;
    end
  end 
  $display ("DATA = %b   LOCATION = %d",data,loc);
end

initial begin
  #1 data = 8'b11;
  #1 data = 8'b100;
  #1 data = 8'b1000;
  #1 data = 8'b1000_0000;
  #1 data = 8'b0;
  #1 $finish;
end

endmodule