uses Math;

procedure TForm1.Button1Click(Sender: TObject);
var
  Res, Exponent: integer;
  Res1: real;
  t, i: integer;
begin
  Exponent := 30;

  Application.ProcessMessages;
  t := GetTickCount;
  for i := 1 to 1000000 do
  Res := 1 shl Exponent;
  Form1.Caption := Form1.Caption + ' ' +
  IntToStr(GetTickCount - t);

  Application.ProcessMessages;
  t := GetTickCount;
  for i := 1 to 1000000 do
  Res1 := LdExp(1, Exponent);
  Form1.Caption := Form1.Caption + ' ' +
  IntToStr(GetTickCount - t);

  Application.ProcessMessages;
  t := GetTickCount;
  for i := 1 to 1000000 do
  Res1 := IntPower(2, Exponent);
  Form1.Caption := Form1.Caption + ' ' +
  IntToStr(GetTickCount - t);

  Application.ProcessMessages;
  t := GetTickCount;
  for i := 1 to 1000000 do
  Res1 := Power(2, Exponent);
  Form1.Caption := Form1.Caption + ' ' +
  IntToStr(GetTickCount - t);
end;