Question on return result from a function

Hello,

I am good at Verilog but I have a project where I need to review VHDL so this might be a simple question but I haven't found an answer yet. What does the function below return when n>1?

Thanks,

Chris

function f_sub_clamp(a : std_logic_vector; b : std_logic_vector; constant LEN,n : integer) return std_logic_vector is

variable A_SZ : integer := a'length;

variable B_SZ : integer := b'length;

variable a2 : std_logic_vector(A_SZ-1 downto 0);

variable a0, a1 : std_logic_vector(A_SZ/2-1 downto 0);

variable b2 : std_logic_vector(B_SZ-1 downto 0);

variable b0, b1 : std_logic_vector(B_SZ/2-1 downto 0);

begin

if n>1 then

a2 := a;

a1 := a2(A_SZ-1 downto A_SZ/2);

a0 := a2(A_SZ/2-1 downto 0);

b2 := b;

b1 := b2(B_SZ-1 downto B_SZ/2);

b0 := b2(B_SZ/2-1 downto 0);

return f_sub_clamp(a1, b1, LEN/2, n/2) & f_sub_clamp(a0, b0, LEN/2, n/2);

elsif unsigned(a)>unsigned(b) then

return ext(unsigned(a)-unsigned(b), LEN);

else

return ext("0", LEN);

end if;

end function;