Why is test1 shorter?

gistfile1.txt

test1(A) ->
    if
        A =:= true ->
            ok;
        A =:= false ->
            error
    end.
test2(A) ->
    case A of
        true ->
            ok;
        false ->
            error
    end.

{function, test1, 1, 2}.
  {label,1}.
    {line,[{location,"test.erl",3}]}.
    {func_info,{atom,test},{atom,test1},1}.
  {label,2}.
    {select_val,{x,0},{f,5},{list,[{atom,true},{f,3},{atom,false},{f,4}]}}.
  {label,3}.
    {move,{atom,ok},{x,0}}.
    return.
  {label,4}.
    {move,{atom,error},{x,0}}.
    return.
  {label,5}.
    {line,[{location,"test.erl",4}]}.
    if_end.

{function, test2, 1, 7}.
  {label,6}.
    {line,[{location,"test.erl",10}]}.
    {func_info,{atom,test},{atom,test2},1}.
  {label,7}.
    {test,is_atom,{f,10},[{x,0}]}.
    {select_val,{x,0},{f,10},{list,[{atom,true},{f,8},{atom,false},{f,9}]}}.
  {label,8}.
    {move,{atom,ok},{x,0}}.
    return.
  {label,9}.
    {move,{atom,error},{x,0}}.
    return.
  {label,10}.
    {line,[{location,"test.erl",11}]}.
    {case_end,{x,0}}.

erlc +dcg test.erl

{function, test1, 1, 2}.
{label,1}.
{line,[{location,"test.erl",3}]}.
{func_info,{atom,test},{atom,test1},1}.
{label,2}.
{test,is_eq_exact,{f,6},[{x,0},{atom,true}]}.
{move,{atom,ok},{x,0}}.
return.
{label,6}.
{test,is_eq_exact,{f,5},[{x,0},{atom,false}]}.
{move,{atom,error},{x,0}}.
return.
{label,5}.
{move,{atom,if_clause},{x,0}}.
{line,[{location,"test.erl",4}]}.
{call_ext_only,1,{extfunc,erlang,error,1}}.
{label,4}.
{label,3}.
if_end.

{function, test2, 1, 8}.
{label,7}.
{line,[{location,"test.erl",10}]}.
{func_info,{atom,test},{atom,test2},1}.
{label,8}.
{test,is_atom,{f,11},[{x,0}]}.
{select_val,{x,0},{f,11},{list,[{atom,true},{f,13},{atom,false},{f,12}]}}.
{label,13}.
{move,{atom,ok},{x,0}}.
return.
{label,12}.
{move,{atom,error},{x,0}}.
return.
{label,11}.
{test_heap,3,1}.
{put_tuple,2,{x,1}}.
{put,{atom,case_clause}}.
{put,{x,0}}.
{move,{x,1},{x,0}}.
{line,[{location,"test.erl",11}]}.
{call_ext_only,1,{extfunc,erlang,error,1}}.
{label,10}.
{label,9}.
if_end.