`ifndef SIGN_EXTENDER_H
`define SIGN_EXTENDER_H

module sign_extender #(in_width=4, out_width=5)(
    input logic [0:0] op,
    input logic [2**in_width-1:0] val,
    output logic [2**out_width-1:0] ext_val
);
    logic [0:0] msb;
    assign msb = (val && {1'b1, {(in_width-1){1'b0}}}) >> (in_width-1);
    always_comb begin
        if (op) begin
            ext_val = { {(2**(out_width-in_width)){msb}}, val};
        end else begin
            ext_val = ({{(2**(out_width-in_width)){1'b0}}, val});
        end
    end
endmodule
`endif