Added project to modelsim

ModelSim/sign_extender.sv

@@ -7,13 +7,10 @@ module sign_extender #(in_width=4, out_width=5)(
     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
+    assign msb = (val >> (in_width-1)) & 1'b1;
+    assign ext_val = op
+        ? { {(2**out_width - 2**in_width){msb}}, val }
+        : { {(2**out_width - 2**in_width){1'b0}}, val };
+  
 endmodule
 `endif