54. Population Count

making more generalized circuit code

module popcount8 #(
    parameter I_WIDTH = 8,
    parameter O_WIDTH = 3 
)(
    input  [I_WIDTH-1:0] in,
    output reg [O_WIDTH:0] count
);
    integer i; // loop variable must be declared (synthesizable)
    always @* begin
        count = {(O_WIDTH + 1){1'b0}};          // default to avoid latch

        // Use a for-loop to accumulate the number of '1' bits
        for (i = 0; i < I_WIDTH; i = i + 1) begin
        // Write code here
            count = count + in[i];
        end
    end
endmodule