Estimate total computation time in FPGA

Hi,

I am using MAX 10 FPGA to implement a controller for my power supply. The VHDL code for the controller is as follows. In this code the input 'I' is a pulse which helps to sample input Iref at a specific instant. The code is executed properly and behaves according to my expectation. Now, I would like to find what will be the total computation time from the moment Iref sample is captured to the moment Vab is calculated as shown below. I used Modelsim to judge the computation delay in a simple multiplication (for example,Ip1 calculation as shown below) or division(for example,Ip calculation as shown below) but could not see any delay. Kindly give some advice how I can find the computation delay for each operation below?

entity Feedforwardv1 is

Port ( Iref : in unsigned(15 downto 0);

I : in STD_LOGIC;

Vab : out signed(19 downto 0));

end Feedforwardv1;

architecture Behavioral of Feedforwardv1 is

signal Irefprev,Ii1,Irefs : integer := 0;

signal Ii2,Ip,Ip1,Iis,Ii : integer := 0;

signal Ii3,Ii3prev: integer := 0;

signal Kpz : integer := 245;

signal Kiz1 : integer := 37941;

signal Kiz2 : integer := 1190;

begin

Ip1 <= Kpz*Irefs;

Ip <= Ip1/4096;

Ii1 <= Irefs - Irefprev;

Ii2 <= Kiz1*Ii1;

Iis <= Ii3prev+Ii2;

Ii <= Iis/2048;

Ii3 <= Kiz2*Ii;

Vab <= to_signed((Ip+Ii),20);

Process(I)

begin

if(rising_edge(I)) then

Irefprev <= Irefs;

Irefs <= to_integer(Iref);

Ii3prev <= Ii3;

--Vab <= to_signed((Ip+Ii),20);

end if;

end process;

end Behavioral;