Updated LUT tests

Signed-off-by: Maciej Kurc <[email protected]>

tests/features/lut/CMakeLists.txt

@@ -5,9 +5,15 @@ add_generic_test(
 )
 
 add_generic_test(
-    name lut
-    board_list testboard
-    sources lut_testarch.v
+    name lut_ff
+    board_list testboard testboard_noffmux
+    sources lut_ff.v
+)
+
+add_generic_test(
+    name lut_routethru
+    board_list testboard_noffmux
+    sources lut_routethru.v
 )
 
 add_xc7_validation_test(

tests/features/lut/lut_routethru.v

@@ -0,0 +1,30 @@
+// Copyright (C) 2021  The Symbiflow Authors.
+//
+// Use of this source code is governed by a ISC-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/ISC
+//
+// SPDX-License-Identifier: ISC
+
+module top(input [3:0] i, output [3:0] o);
+
+wire i0_wire, i1_wire, i2_wire, i3_wire;
+wire o0_wire, o1_wire, o2_wire, o3_wire;
+
+IB ib_0(.I(i0_wire), .P(i[0]));
+IB ib_1(.I(i1_wire), .P(i[1]));
+IB ib_2(.I(i2_wire), .P(i[2]));
+IB ib_3(.I(i3_wire), .P(i[3]));
+
+OB ob_0(.O(o0_wire), .P(o[0]));
+OB ob_1(.O(o1_wire), .P(o[1]));
+OB ob_2(.O(o2_wire), .P(o[2]));
+OB ob_3(.O(o3_wire), .P(o[3]));
+
+// "Free" flip-flops. In the testarch with no FFMUX they require LUT-thrus
+DFF ff_0(.D(i0_wire), .C(1'b1), .R(1'b0), .Q(o0_wire));
+DFF ff_1(.D(i1_wire), .C(1'b1), .R(1'b0), .Q(o1_wire));
+DFF ff_2(.D(i2_wire), .C(1'b1), .R(1'b0), .Q(o2_wire));
+DFF ff_3(.D(i3_wire), .C(1'b1), .R(1'b0), .Q(o3_wire));
+
+endmodule