Cleanups in xilinx examples

techlibs/xilinx/example_sim_counter/run_sim.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -ex
+
+XILINX_DIR=/opt/Xilinx/14.5/ISE_DS/ISE
+
+../../../yosys -p 'synth_xilinx -top counter; write_verilog -noattr testbench_synth.v' counter.v
+
+iverilog -o testbench_gold counter_tb.v counter.v
+iverilog -o testbench_gate counter_tb.v testbench_synth.v \
+	$XILINX_DIR/verilog/src/{glbl,unisims/{FDRE,LUT1,LUT2,LUT3,LUT4,LUT5,LUT6}}.v
+
+./testbench_gold > testbench_gold.txt
+./testbench_gate > testbench_gate.txt
+
+if diff -u testbench_gold.txt testbench_gate.txt; then
+	set +x; echo; echo; banner "  PASS  "
+else
+	exit 1
+fi
+
+rm -f testbench_{synth,gold,gate,mapped}*
+