61. Vector Min/Max Pair

Compare the individual numbers one by one, and eventually pass the final value to the output.

module minmax4_task (
    input  [7:0] v0,
    input  [7:0] v1,
    input  [7:0] v2,
    input  [7:0] v3,
    output reg [7:0] min_val,
    output reg [7:0] max_val
);
    // --------- Provided task (complete the TODOs) ----------
    // Returns both min and max among four 8-bit unsigned inputs.
    task minmax4;
        input  [7:0] a, b, c, d;
        output [7:0] min_o;
        output [7:0] max_o;

        reg [7:0] min01, max01;
        reg [7:0] min23, max23;
        begin
            // Pairwise compare (a,b)
            // TODO: set max01 as the larger of a and b
            // TODO: set min01 as the smaller of a and b
             max01 = (a>b)? a:b;
             min01 = (a>b)? b:a;

            // Pairwise compare (c,d)
            // TODO: set max23 as the larger of c and d
            // TODO: set min23 as the smaller of c and d
             max23 = (c>d)? c:d;
             min23 = (c>d)? d:c;

            // Final reduce across pairs
            // TODO: set max_o as the larger of max01 and max23
            // TODO: set min_o as the smaller of min01 and min23
             max_o = (max01>max23)? max01:max23;
            min_o = (min01>min23)? min23:min01;
        end
    endtask
    // -------------------------------------------------------

    // TODO: Call the task and assign outputs
    reg [7:0] tmin, tmax;
    always @* begin
        minmax4(v0,v1,v2,v3,min_val,max_val);
    end

endmodule