techmap: add TCL test for Han-Carlson adder

tests/techmap/han-carlson.nomatch

@@ -0,0 +1,2 @@
+i
+j

tests/techmap/han-carlson.tcl

@@ -0,0 +1,14 @@
+yosys -import
+
+read_verilog +/choices/han-carlson.v
+read_verilog lcu_refined.v
+design -save init
+
+for {set i 1} {$i <= 16} {incr i} {
+    design -load init
+    chparam -set WIDTH $i
+    yosys proc
+    equiv_make -blacklist han-carlson.nomatch lcu _85_lcu_han_carlson equiv
+    equiv_simple equiv
+    equiv_status -assert equiv
+}

tests/techmap/lcu_refined.v

@@ -0,0 +1,20 @@
+// Copied from techlibs/common/simlib.v
+// with this condition removed: (^{P, G, CI} !== 1'bx)
+module lcu (P, G, CI, CO);
+
+parameter WIDTH = 2;
+
+input [WIDTH-1:0] P;    // Propagate
+input [WIDTH-1:0] G;    // Generate
+input CI;               // Carry-in
+
+output reg [WIDTH-1:0] CO; // Carry-out
+
+integer i;
+always @* begin
+	CO[0] = G[0] || (P[0] && CI);
+	for (i = 1; i < WIDTH; i = i+1)
+		CO[i] = G[i] || (P[i] && CO[i-1]);
+end
+
+endmodule

tests/techmap/run-test.sh

@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 set -eu
 source ../gen-tests-makefile.sh
-run_tests --yosys-scripts --bash --yosys-args "-e 'select out of bounds'"
+run_tests --yosys-scripts --tcl-scripts --bash --yosys-args "-e 'select out of bounds'"