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diff --git a/passes/techmap/dff2dffe.cc b/passes/techmap/dff2dffe.cc
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+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *  
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *  
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "kernel/yosys.h"
+#include "kernel/sigtools.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+struct Dff2dffeWorker
+{
+	RTLIL::Module *module;
+	SigMap sigmap;
+
+	Dff2dffeWorker(RTLIL::Module *module) : module(module), sigmap(module)
+	{
+	}
+
+	void run()
+	{
+		log("Transforming $dff to $dffe cells in module %s:\n", log_id(module));
+	}
+};
+
+struct Dff2dffePass : public Pass {
+	Dff2dffePass() : Pass("dff2dffe", "transform $dff cells to $dffe cells") { }
+	virtual void help()
+	{
+		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+		log("\n");
+		log("    dff2dffe [selection]\n");
+		log("\n");
+		log("This pass transforms $dff cells driven by a tree of multiplexers with one or\n");
+		log("more feedback paths to a $dffe cells.\n");
+		log("\n");
+	}
+	virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
+	{
+		log_header("Executing DFF2DFFE pass (transform $dff to $dffe where applicable).\n");
+
+		size_t argidx;
+		for (argidx = 1; argidx < args.size(); argidx++) {
+			// if (args[argidx] == "-foobar") {
+			// 	foobar_mode = true;
+			// 	continue;
+			// }
+			break;
+		}
+		extra_args(args, argidx, design);
+
+		for (auto mod : design->selected_modules())
+			if (!mod->has_processes_warn()) {
+				Dff2dffeWorker worker(mod);
+				worker.run();
+			}
+	}
+} Dff2dffePass;
+ 
+PRIVATE_NAMESPACE_END