How do you plan to solve it?
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
);
// 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
max01=(a>b)?a:b;
min01=(a>b)?b:a;
max23=(c>d)?c:d;
min23=(c>d)?d:c;
max_o=(max01>max23)?max01:max23;
min_o=(min01>min23)?min23:min01;
end
endtask
// -------------------------------------------------------
//reg [7:0] tmin, tmax;
always @* begin
minmax4(v0,v1,v2,v3,min_val,max_val);
end
endmodule