Merge remote-tracking branch 'origin/eddie/abc9_refactor' into xaig_arrival_required

91 files changed, 3416 insertions, 2459 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 01ae17c2b..481ba266e 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -57,6 +57,8 @@ Yosys 0.9 .. Yosys 0.9-dev
       always_latch and always_ff)
     - Added "xilinx_dffopt" pass
     - Added "scratchpad" pass
+    - Added "abc9 -dff"
+    - Added "synth_xilinx -dff"
 
 Yosys 0.8 .. Yosys 0.9
 ----------------------
diff --git a/README.md b/README.md
index 0250c7846..aab1c7d6b 100644
--- a/README.md
+++ b/README.md
@@ -378,6 +378,9 @@ Verilog Attributes and non-standard features
   for example, to specify the clk-to-Q delay of a flip-flop for consideration
   during techmapping.
 
+- The module attribute ``abc9_flop`` is a boolean marking the module as a
+  whitebox that describes the synchronous behaviour of a flip-flop.
+
 - The frontend sets attributes ``always_comb``, ``always_latch`` and
   ``always_ff`` on processes derived from SystemVerilog style always blocks
   according to the type of the always. These are checked for correctness in
diff --git a/backends/aiger/xaiger.cc b/backends/aiger/xaiger.cc
index db38f2017..5aea70f3b 100644
--- a/backends/aiger/xaiger.cc
+++ b/backends/aiger/xaiger.cc
@@ -82,6 +82,7 @@ struct XAigerWriter
 	dict<SigBit, SigBit> not_map, alias_map;
 	dict<SigBit, pair<SigBit, SigBit>> and_map;
 	vector<SigBit> ci_bits, co_bits;
+	dict<SigBit, Cell*> ff_bits;
 	dict<SigBit, float> arrival_times;
 
 	vector<pair<int, int>> aig_gates;
@@ -92,7 +93,7 @@ struct XAigerWriter
 	dict<SigBit, int> ordered_outputs;
 
 	vector<Cell*> box_list;
-	bool omode = false;
+	dict<IdString, std::vector<IdString>> box_ports;
 
 	int mkgate(int a0, int a1)
 	{
@@ -136,11 +137,10 @@ struct XAigerWriter
 		return a;
 	}
 
-	XAigerWriter(Module *module, bool holes_mode=false) : module(module), sigmap(module)
+	XAigerWriter(Module *module) : module(module), sigmap(module)
 	{
 		pool<SigBit> undriven_bits;
 		pool<SigBit> unused_bits;
-		pool<SigBit> keep_bits;
 
 		// promote public wires
 		for (auto wire : module->wires())
@@ -152,55 +152,54 @@ struct XAigerWriter
 			if (wire->port_input)
 				sigmap.add(wire);
 
+		// promote keep wires
 		for (auto wire : module->wires())
-		{
-			bool keep = wire->attributes.count("\\keep");
+			if (wire->get_bool_attribute(ID::keep))
+				sigmap.add(wire);
 
+		// First, collect all the ports in port_id order
+		//   since module->wires() could be sorted
+		//   alphabetically
+		for (auto port : module->ports) {
+			auto wire = module->wire(port);
+			log_assert(wire);
 			for (int i = 0; i < GetSize(wire); i++)
 			{
 				SigBit wirebit(wire, i);
 				SigBit bit = sigmap(wirebit);
 
-				if (bit.wire) {
-					undriven_bits.insert(bit);
-					unused_bits.insert(bit);
+				if (bit.wire == nullptr) {
+					if (wire->port_output) {
+						aig_map[wirebit] = (bit == State::S1) ? 1 : 0;
+						output_bits.insert(wirebit);
+					}
+					continue;
 				}
 
-				if (keep)
-					keep_bits.insert(wirebit);
+				if (wire->port_input)
+					input_bits.insert(bit);
 
-				if (wire->port_input || keep) {
+				if (wire->port_output) {
 					if (bit != wirebit)
-						alias_map[bit] = wirebit;
-					input_bits.insert(wirebit);
-				}
-
-				if (wire->port_output || keep) {
-					if (bit != RTLIL::Sx) {
-						if (bit != wirebit)
-							alias_map[wirebit] = bit;
-						output_bits.insert(wirebit);
-					}
-					else
-						log_debug("Skipping PO '%s' driven by 1'bx\n", log_signal(wirebit));
+						alias_map[wirebit] = bit;
+					output_bits.insert(wirebit);
 				}
 			}
 		}
 
-		for (auto bit : input_bits)
-			undriven_bits.erase(sigmap(bit));
-		for (auto bit : output_bits)
-			if (!bit.wire->port_input)
-				unused_bits.erase(bit);
+		for (auto wire : module->wires())
+			for (int i = 0; i < GetSize(wire); i++)
+			{
+				SigBit wirebit(wire, i);
+				SigBit bit = sigmap(wirebit);
 
-		// TODO: Speed up toposort -- ultimately we care about
-		//       box ordering, but not individual AIG cells
-		dict<SigBit, pool<IdString>> bit_drivers, bit_users;
-		TopoSort<IdString, RTLIL::sort_by_id_str> toposort;
-		bool abc9_box_seen = false;
-		std::vector<int> arrivals;
+				if (bit.wire) {
+					undriven_bits.insert(bit);
+					unused_bits.insert(bit);
+				}
+			}
 
-		for (auto cell : module->selected_cells()) {
+		for (auto cell : module->cells()) {
 			if (cell->type == "$_NOT_")
 			{
 				SigBit A = sigmap(cell->getPort("\\A").as_bit());
@@ -208,11 +207,6 @@ struct XAigerWriter
 				unused_bits.erase(A);
 				undriven_bits.erase(Y);
 				not_map[Y] = A;
-				if (!holes_mode) {
-					toposort.node(cell->name);
-					bit_users[A].insert(cell->name);
-					bit_drivers[Y].insert(cell->name);
-				}
 				continue;
 			}
 
@@ -225,277 +219,215 @@ struct XAigerWriter
 				unused_bits.erase(B);
 				undriven_bits.erase(Y);
 				and_map[Y] = make_pair(A, B);
-				if (!holes_mode) {
-					toposort.node(cell->name);
-					bit_users[A].insert(cell->name);
-					bit_users[B].insert(cell->name);
-					bit_drivers[Y].insert(cell->name);
-				}
 				continue;
 			}
 
-			log_assert(!holes_mode);
+			if (cell->type == "$__ABC9_FF_" &&
+                                        // The presence of an abc9_mergeability attribute indicates
+                                        //   that we do want to pass this flop to ABC
+                                        cell->attributes.count("\\abc9_mergeability"))
+			{
+				SigBit D = sigmap(cell->getPort("\\D").as_bit());
+				SigBit Q = sigmap(cell->getPort("\\Q").as_bit());
+				unused_bits.erase(D);
+				undriven_bits.erase(Q);
+				alias_map[Q] = D;
+				auto r YS_ATTRIBUTE(unused) = ff_bits.insert(std::make_pair(D, cell));
+				log_assert(r.second);
+				continue;
+			}
 
 			RTLIL::Module* inst_module = module->design->module(cell->type);
-			if (inst_module && inst_module->attributes.count("\\abc9_box_id")) {
-				abc9_box_seen = true;
-
-				if (!holes_mode) {
-					toposort.node(cell->name);
-					for (const auto &conn : cell->connections()) {
-						auto port_wire = inst_module->wire(conn.first);
-						if (port_wire->port_input) {
-							// Ignore inout for the sake of topographical ordering
-							if (port_wire->port_output) continue;
-							for (auto bit : sigmap(conn.second))
-								bit_users[bit].insert(cell->name);
-						}
+			if (inst_module) {
+				auto it = cell->attributes.find("\\abc9_box_seq");
+				if (it != cell->attributes.end()) {
+					int abc9_box_seq = it->second.as_int();
+					if (GetSize(box_list) <= abc9_box_seq)
+						box_list.resize(abc9_box_seq+1);
+					box_list[abc9_box_seq] = cell;
+					if (!inst_module->get_bool_attribute("\\abc9_flop"))
+						continue;
+				}
 
-						if (port_wire->port_output)
+				for (const auto &conn : cell->connections()) {
+					auto port_wire = inst_module->wire(conn.first);
+					if (port_wire->port_output) {
+						int arrival = 0;
+						auto it = port_wire->attributes.find("\\abc9_arrival");
+						if (it != port_wire->attributes.end()) {
+							if (it->second.flags != 0)
+								log_error("Attribute 'abc9_arrival' on port '%s' of module '%s' is not an integer.\n", log_id(port_wire), log_id(cell->type));
+							arrival = it->second.as_int();
+						}
+						if (arrival)
 							for (auto bit : sigmap(conn.second))
-								bit_drivers[bit].insert(cell->name);
+								arrival_times[bit] = arrival;
 					}
 				}
 			}
-			else {
-				bool cell_known = inst_module || cell->known();
-				for (const auto &c : cell->connections()) {
-					if (c.second.is_fully_const()) continue;
-					auto port_wire = inst_module ? inst_module->wire(c.first) : nullptr;
-					auto is_input = (port_wire && port_wire->port_input) || !cell_known || cell->input(c.first);
-					auto is_output = (port_wire && port_wire->port_output) || !cell_known || cell->output(c.first);
-					if (!is_input && !is_output)
-						log_error("Connection '%s' on cell '%s' (type '%s') not recognised!\n", log_id(c.first), log_id(cell), log_id(cell->type));
-
-					if (is_input) {
-						for (auto b : c.second) {
-							Wire *w = b.wire;
-							if (!w) continue;
-							if (!w->port_output || !cell_known) {
-								SigBit I = sigmap(b);
-								if (I != b)
-									alias_map[b] = I;
-								output_bits.insert(b);
-								unused_bits.erase(b);
-
-								if (!cell_known)
-									keep_bits.insert(b);
-							}
-						}
-					}
-					if (is_output) {
-						arrivals.clear();
-						if (port_wire) {
-							auto it = port_wire->attributes.find("\\abc9_arrival");
-							if (it != port_wire->attributes.end()) {
-								if (it->second.flags == 0)
-									arrivals.push_back(it->second.as_int());
-								else
-									for (const auto &tok : split_tokens(it->second.decode_string()))
-										arrivals.push_back(atoi(tok.c_str()));
-							}
-						}
 
-						log_assert(GetSize(arrivals) <= 1 || GetSize(arrivals) == GetSize(c.second));
-						auto it = arrivals.begin();
-						for (auto b : c.second) {
-							Wire *w = b.wire;
-							if (!w) continue;
-							input_bits.insert(b);
-							SigBit O = sigmap(b);
-							if (O != b)
-								alias_map[O] = b;
-							undriven_bits.erase(O);
-
-							if (!arrivals.empty()) {
-								if (arrivals.size() == 1)
-									arrival_times[b] = *it;
-								else
-									arrival_times[b] = *it++;
-							}
+			bool cell_known = inst_module || cell->known();
+			for (const auto &c : cell->connections()) {
+				if (c.second.is_fully_const()) continue;
+				auto port_wire = inst_module ? inst_module->wire(c.first) : nullptr;
+				auto is_input = (port_wire && port_wire->port_input) || !cell_known || cell->input(c.first);
+				auto is_output = (port_wire && port_wire->port_output) || !cell_known || cell->output(c.first);
+				if (!is_input && !is_output)
+					log_error("Connection '%s' on cell '%s' (type '%s') not recognised!\n", log_id(c.first), log_id(cell), log_id(cell->type));
+
+				if (is_input)
+					for (auto b : c.second) {
+						Wire *w = b.wire;
+						if (!w) continue;
+						if (!w->port_output || !cell_known) {
+							SigBit I = sigmap(b);
+							if (I != b)
+								alias_map[b] = I;
+							output_bits.insert(b);
 						}
 					}
-				}
 			}
 
 			//log_warning("Unsupported cell type: %s (%s)\n", log_id(cell->type), log_id(cell));
 		}
 
-		if (abc9_box_seen) {
-			for (auto &it : bit_users)
-				if (bit_drivers.count(it.first))
-					for (auto driver_cell : bit_drivers.at(it.first))
-					for (auto user_cell : it.second)
-						toposort.edge(driver_cell, user_cell);
-
-#if 0
-			toposort.analyze_loops = true;
-#endif
-			bool no_loops YS_ATTRIBUTE(unused) = toposort.sort();
-#if 0
-			unsigned i = 0;
-			for (auto &it : toposort.loops) {
-				log("  loop %d\n", i++);
-				for (auto cell_name : it) {
-					auto cell = module->cell(cell_name);
-					log_assert(cell);
-					log("\t%s (%s @ %s)\n", log_id(cell), log_id(cell->type), cell->get_src_attribute().c_str());
-				}
-			}
-#endif
-			log_assert(no_loops);
-
-			for (auto cell_name : toposort.sorted) {
-				RTLIL::Cell *cell = module->cell(cell_name);
-				log_assert(cell);
-
-				RTLIL::Module* box_module = module->design->module(cell->type);
-				if (!box_module || !box_module->attributes.count("\\abc9_box_id"))
-					continue;
+		for (auto cell : box_list) {
+			log_assert(cell);
 
-				bool blackbox = box_module->get_blackbox_attribute(true /* ignore_wb */);
+			RTLIL::Module* box_module = module->design->module(cell->type);
+			log_assert(box_module);
+			log_assert(box_module->attributes.count("\\abc9_box_id"));
 
-				// Fully pad all unused input connections of this box cell with S0
-				// Fully pad all undriven output connections of this box cell with anonymous wires
-				// NB: Assume box_module->ports are sorted alphabetically
-				//     (as RTLIL::Module::fixup_ports() would do)
+			auto r = box_ports.insert(cell->type);
+			if (r.second) {
+				// Make carry in the last PI, and carry out the last PO
+				//   since ABC requires it this way
+				IdString carry_in, carry_out;
 				for (const auto &port_name : box_module->ports) {
-					RTLIL::Wire* w = box_module->wire(port_name);
+					auto w = box_module->wire(port_name);
 					log_assert(w);
-					auto it = cell->connections_.find(port_name);
-					if (w->port_input) {
-						RTLIL::SigSpec rhs;
-						if (it != cell->connections_.end()) {
-							if (GetSize(it->second) < GetSize(w))
-								it->second.append(RTLIL::SigSpec(State::S0, GetSize(w)-GetSize(it->second)));
-							rhs = it->second;
-						}
-						else {
-							rhs = RTLIL::SigSpec(State::S0, GetSize(w));
-							cell->setPort(port_name, rhs);
+					if (w->get_bool_attribute("\\abc9_carry")) {
+						if (w->port_input) {
+							if (carry_in != IdString())
+								log_error("Module '%s' contains more than one 'abc9_carry' input port.\n", log_id(box_module));
+							carry_in = port_name;
 						}
-
-						for (auto b : rhs.bits()) {
-							SigBit I = sigmap(b);
-							if (b == RTLIL::Sx)
-								b = State::S0;
-							else if (I != b) {
-								if (I == RTLIL::Sx)
-									alias_map[b] = State::S0;
-								else
-									alias_map[b] = I;
-							}
-							co_bits.emplace_back(b);
-							unused_bits.erase(b);
+						if (w->port_output) {
+							if (carry_out != IdString())
+								log_error("Module '%s' contains more than one 'abc9_carry' output port.\n", log_id(box_module));
+							carry_out = port_name;
 						}
 					}
-					if (w->port_output) {
-						RTLIL::SigSpec rhs;
-						auto it = cell->connections_.find(w->name);
-						if (it != cell->connections_.end()) {
-							if (GetSize(it->second) < GetSize(w))
-								it->second.append(module->addWire(NEW_ID, GetSize(w)-GetSize(it->second)));
-							rhs = it->second;
-						}
-						else {
-							Wire *wire = module->addWire(NEW_ID, GetSize(w));
-							if (blackbox)
-								wire->set_bool_attribute(ID(abc9_padding));
-							rhs = wire;
-							cell->setPort(port_name, rhs);
-						}
+					else
+						r.first->second.push_back(port_name);
+				}
 
-						for (const auto &b : rhs.bits()) {
-							ci_bits.emplace_back(b);
-							SigBit O = sigmap(b);
-							if (O != b)
-								alias_map[O] = b;
-							undriven_bits.erase(O);
-							input_bits.erase(b);
-						}
-					}
+				if (carry_in != IdString() && carry_out == IdString())
+					log_error("Module '%s' contains an 'abc9_carry' input port but no output port.\n", log_id(box_module));
+				if (carry_in == IdString() && carry_out != IdString())
+					log_error("Module '%s' contains an 'abc9_carry' output port but no input port.\n", log_id(box_module));
+				if (carry_in != IdString()) {
+					r.first->second.push_back(carry_in);
+					r.first->second.push_back(carry_out);
 				}
-				box_list.emplace_back(cell);
 			}
 
-			// TODO: Free memory from toposort, bit_drivers, bit_users
-		}
-
-		for (auto bit : input_bits) {
-			if (!output_bits.count(bit))
-				continue;
-			RTLIL::Wire *wire = bit.wire;
-			// If encountering an inout port, or a keep-ed wire, then create a new wire
-			// with $inout.out suffix, make it a PO driven by the existing inout, and
-			// inherit existing inout's drivers
-			if ((wire->port_input && wire->port_output && !undriven_bits.count(bit))
-					|| keep_bits.count(bit)) {
-				RTLIL::IdString wire_name = stringf("$%s$inout.out", wire->name.c_str());
-				RTLIL::Wire *new_wire = module->wire(wire_name);
-				if (!new_wire)
-					new_wire = module->addWire(wire_name, GetSize(wire));
-				SigBit new_bit(new_wire, bit.offset);
-				module->connect(new_bit, bit);
-				if (not_map.count(bit)) {
-					auto a = not_map.at(bit);
-					not_map[new_bit] = a;
+			for (auto port_name : r.first->second) {
+				auto w = box_module->wire(port_name);
+				log_assert(w);
+
+				SigSpec rhs = cell->connections_.at(port_name, SigSpec());
+				if (w->port_input) {
+					// Add padding to fill entire port
+					rhs.append(SigSpec(State::Sx, GetSize(w)-GetSize(rhs)));
+					for (auto b : rhs) {
+						SigBit I = sigmap(b);
+						if (b == RTLIL::Sx)
+							b = State::S0;
+						else if (I != b) {
+							if (I == RTLIL::Sx)
+								alias_map[b] = State::S0;
+							else
+								alias_map[b] = I;
+						}
+						co_bits.emplace_back(b);
+						unused_bits.erase(I);
+					}
 				}
-				else if (and_map.count(bit)) {
-					auto a = and_map.at(bit);
-					and_map[new_bit] = a;
+				if (w->port_output) {
+					// Add padding to fill entire port
+					rhs.append(SigSpec(State::Sx, GetSize(w)-GetSize(rhs)));
+					for (const auto &b : rhs) {
+						SigBit O = sigmap(b);
+						if (O != b)
+							alias_map[O] = b;
+						ci_bits.emplace_back(b);
+						undriven_bits.erase(O);
+					}
 				}
-				else if (alias_map.count(bit)) {
-					auto a = alias_map.at(bit);
-					alias_map[new_bit] = a;
+			}
+
+			// Connect <cell>.abc9_ff.Q (inserted by abc9_map.v) as the last input to the flop box
+			if (box_module->get_bool_attribute("\\abc9_flop")) {
+				SigSpec rhs = module->wire(stringf("%s.abc9_ff.Q", cell->name.c_str()));
+				if (rhs.empty())
+					log_error("'%s.abc9_ff.Q' is not a wire present in module '%s'.\n", log_id(cell), log_id(module));
+
+				for (auto b : rhs) {
+					SigBit I = sigmap(b);
+					if (b == RTLIL::Sx)
+						b = State::S0;
+					else if (I != b) {
+						if (I == RTLIL::Sx)
+							alias_map[b] = State::S0;
+						else
+							alias_map[b] = I;
+					}
+					co_bits.emplace_back(b);
+					unused_bits.erase(I);
 				}
-				else
-					alias_map[new_bit] = bit;
-				output_bits.erase(bit);
-				output_bits.insert(new_bit);
 			}
 		}
 
+		for (auto bit : input_bits)
+			undriven_bits.erase(bit);
+		for (auto bit : output_bits)
+			unused_bits.erase(sigmap(bit));
 		for (auto bit : unused_bits)
 			undriven_bits.erase(bit);
 
-		if (!undriven_bits.empty() && !holes_mode) {
-			undriven_bits.sort();
-			for (auto bit : undriven_bits) {
-				log_warning("Treating undriven bit %s.%s like $anyseq.\n", log_id(module), log_signal(bit));
-				input_bits.insert(bit);
-			}
-			log_warning("Treating a total of %d undriven bits in %s like $anyseq.\n", GetSize(undriven_bits), log_id(module));
-		}
-
-		if (holes_mode) {
-			struct sort_by_port_id {
-				bool operator()(const RTLIL::SigBit& a, const RTLIL::SigBit& b) const {
-					return a.wire->port_id < b.wire->port_id;
-				}
-			};
-			input_bits.sort(sort_by_port_id());
-			output_bits.sort(sort_by_port_id());
-		}
-		else {
-			input_bits.sort();
-			output_bits.sort();
+		// Make all undriven bits a primary input
+		for (auto bit : undriven_bits) {
+			input_bits.insert(bit);
+			undriven_bits.erase(bit);
 		}
 
-		not_map.sort();
-		and_map.sort();
-
 		aig_map[State::S0] = 0;
 		aig_map[State::S1] = 1;
 
-		for (auto bit : input_bits) {
+		// pool<> iterates in LIFO order...
+		for (int i = input_bits.size()-1; i >= 0; i--) {
+			const auto &bit = *input_bits.element(i);
 			aig_m++, aig_i++;
 			log_assert(!aig_map.count(bit));
 			aig_map[bit] = 2*aig_m;
 		}
 
-		for (auto bit : ci_bits) {
+		for (const auto &i : ff_bits) {
+			const Cell *cell = i.second;
+			const SigBit &q = sigmap(cell->getPort("\\Q"));
 			aig_m++, aig_i++;
-			aig_map[bit] = 2*aig_m;
+			log_assert(!aig_map.count(q));
+			aig_map[q] = 2*aig_m;
+		}
+
+		for (auto &bit : ci_bits) {
+			aig_m++, aig_i++;
+			// State::Sx if padding
+			if (bit != State::Sx) {
+				log_assert(!aig_map.count(bit));
+				aig_map[bit] = 2*aig_m;
+			}
 		}
 
 		for (auto bit : co_bits) {
@@ -503,15 +435,18 @@ struct XAigerWriter
 			aig_outputs.push_back(bit2aig(bit));
 		}
 
-		if (output_bits.empty()) {
-			output_bits.insert(State::S0);
-			omode = true;
-		}
-
-		for (auto bit : output_bits) {
+		// pool<> iterates in LIFO order...
+		for (int i = output_bits.size()-1; i >= 0; i--) {
+			const auto &bit = *output_bits.element(i);
 			ordered_outputs[bit] = aig_o++;
 			aig_outputs.push_back(bit2aig(bit));
 		}
+
+		for (auto &i : ff_bits) {
+			const SigBit &d = i.first;
+			aig_o++;
+			aig_outputs.push_back(aig_map.at(d));
+		}
 	}
 
 	void write_aiger(std::ostream &f, bool ascii_mode)
@@ -573,7 +508,6 @@ struct XAigerWriter
 
 		f << "c";
 
-		log_assert(!output_bits.empty());
 		auto write_buffer = [](std::stringstream &buffer, int i32) {
 			int32_t i32_be = to_big_endian(i32);
 			buffer.write(reinterpret_cast<const char*>(&i32_be), sizeof(i32_be));
@@ -581,14 +515,14 @@ struct XAigerWriter
 		std::stringstream h_buffer;
 		auto write_h_buffer = std::bind(write_buffer, std::ref(h_buffer), std::placeholders::_1);
 		write_h_buffer(1);
-		log_debug("ciNum = %d\n", GetSize(input_bits) + GetSize(ci_bits));
-		write_h_buffer(input_bits.size() + ci_bits.size());
-		log_debug("coNum = %d\n", GetSize(output_bits) + GetSize(co_bits));
-		write_h_buffer(output_bits.size() + GetSize(co_bits));
-		log_debug("piNum = %d\n", GetSize(input_bits));
-		write_h_buffer(input_bits.size());
-		log_debug("poNum = %d\n", GetSize(output_bits));
-		write_h_buffer(output_bits.size());
+		log_debug("ciNum = %d\n", GetSize(input_bits) + GetSize(ff_bits) + GetSize(ci_bits));
+		write_h_buffer(input_bits.size() + ff_bits.size() + ci_bits.size());
+		log_debug("coNum = %d\n", GetSize(output_bits) + GetSize(ff_bits) + GetSize(co_bits));
+		write_h_buffer(output_bits.size() + GetSize(ff_bits) + GetSize(co_bits));
+		log_debug("piNum = %d\n", GetSize(input_bits) + GetSize(ff_bits));
+		write_h_buffer(input_bits.size() + ff_bits.size());
+		log_debug("poNum = %d\n", GetSize(output_bits) + GetSize(ff_bits));
+		write_h_buffer(output_bits.size() + ff_bits.size());
 		log_debug("boxNum = %d\n", GetSize(box_list));
 		write_h_buffer(box_list.size());
 
@@ -604,75 +538,34 @@ struct XAigerWriter
 		//for (auto bit : output_bits)
 		//	write_o_buffer(0);
 
-		if (!box_list.empty()) {
-			RTLIL::Module *holes_module = module->design->addModule("$__holes__");
+		if (!box_list.empty() || !ff_bits.empty()) {
+			RTLIL::Module *holes_module = module->design->module(stringf("%s$holes", module->name.c_str()));
 			log_assert(holes_module);
 
 			dict<IdString, Cell*> cell_cache;
 
-			int port_id = 1;
 			int box_count = 0;
 			for (auto cell : box_list) {
+				log_assert(cell);
+
 				RTLIL::Module* box_module = module->design->module(cell->type);
 				log_assert(box_module);
-				IdString derived_name = box_module->derive(module->design, cell->parameters);
-				box_module = module->design->module(derived_name);
-				if (box_module->has_processes())
-					log_error("ABC9 box '%s' contains processes!\n", box_module->name.c_str());
 
 				int box_inputs = 0, box_outputs = 0;
-				auto r = cell_cache.insert(std::make_pair(derived_name, nullptr));
-				Cell *holes_cell = r.first->second;
-				if (r.second && !holes_cell && box_module->get_bool_attribute("\\whitebox")) {
-					holes_cell = holes_module->addCell(cell->name, cell->type);
-					holes_cell->parameters = cell->parameters;
-					r.first->second = holes_cell;
-				}
-
-				// NB: Assume box_module->ports are sorted alphabetically
-				//     (as RTLIL::Module::fixup_ports() would do)
-				for (const auto &port_name : box_module->ports) {
+				for (auto port_name : box_module->ports) {
 					RTLIL::Wire *w = box_module->wire(port_name);
 					log_assert(w);
-					RTLIL::Wire *holes_wire;
-					RTLIL::SigSpec port_sig;
 					if (w->port_input)
-						for (int i = 0; i < GetSize(w); i++) {
-							box_inputs++;
-							holes_wire = holes_module->wire(stringf("\\i%d", box_inputs));
-							if (!holes_wire) {
-								holes_wire = holes_module->addWire(stringf("\\i%d", box_inputs));
-								holes_wire->port_input = true;
-								holes_wire->port_id = port_id++;
-								holes_module->ports.push_back(holes_wire->name);
-							}
-							if (holes_cell)
-								port_sig.append(holes_wire);
-						}
-					if (w->port_output) {
+						box_inputs += GetSize(w);
+					if (w->port_output)
 						box_outputs += GetSize(w);
-						for (int i = 0; i < GetSize(w); i++) {
-							if (GetSize(w) == 1)
-								holes_wire = holes_module->addWire(stringf("%s.%s", cell->name.c_str(), log_id(w->name)));
-							else
-								holes_wire = holes_module->addWire(stringf("%s.%s[%d]", cell->name.c_str(), log_id(w->name), i));
-							holes_wire->port_output = true;
-							holes_wire->port_id = port_id++;
-							holes_module->ports.push_back(holes_wire->name);
-							if (holes_cell)
-								port_sig.append(holes_wire);
-							else
-								holes_module->connect(holes_wire, State::S0);
-						}
-					}
-					if (!port_sig.empty()) {
-						if (r.second)
-							holes_cell->setPort(w->name, port_sig);
-						else
-							holes_module->connect(holes_cell->getPort(w->name), port_sig);
-					}
 				}
 
+				// For flops only, create an extra 1-bit input that drives a new wire
+				//   called "<cell>.abc9_ff.Q" that is used below
+				if (box_module->get_bool_attribute("\\abc9_flop"))
+					box_inputs++;
+
 				write_h_buffer(box_inputs);
 				write_h_buffer(box_outputs);
 				write_h_buffer(box_module->attributes.at("\\abc9_box_id").as_int());
@@ -681,57 +574,58 @@ struct XAigerWriter
 
 			std::stringstream r_buffer;
 			auto write_r_buffer = std::bind(write_buffer, std::ref(r_buffer), std::placeholders::_1);
-			write_r_buffer(0);
+			log_debug("flopNum = %d\n", GetSize(ff_bits));
+			write_r_buffer(ff_bits.size());
+
+			std::stringstream s_buffer;
+			auto write_s_buffer = std::bind(write_buffer, std::ref(s_buffer), std::placeholders::_1);
+			write_s_buffer(ff_bits.size());
+
+			for (const auto &i : ff_bits) {
+				const SigBit &d = i.first;
+				const Cell *cell = i.second;
+
+				int mergeability = cell->attributes.at(ID(abc9_mergeability)).as_int();
+				log_assert(mergeability > 0);
+				write_r_buffer(mergeability);
+
+				Const init = cell->attributes.at(ID(abc9_init));
+				log_assert(GetSize(init) == 1);
+				if (init == State::S1)
+					write_s_buffer(1);
+				else if (init == State::S0)
+					write_s_buffer(0);
+				else {
+					log_assert(init == State::Sx);
+					write_s_buffer(0);
+				}
+
+				write_i_buffer(arrival_times.at(d, 0));
+				//write_o_buffer(0);
+			}
+
 			f << "r";
 			std::string buffer_str = r_buffer.str();
 			int32_t buffer_size_be = to_big_endian(buffer_str.size());
 			f.write(reinterpret_cast<const char*>(&buffer_size_be), sizeof(buffer_size_be));
 			f.write(buffer_str.data(), buffer_str.size());
 
-			if (holes_module) {
-				log_push();
-
-				// NB: fixup_ports() will sort ports by name
-				//holes_module->fixup_ports();
-				holes_module->check();
-
-				holes_module->design->selection_stack.emplace_back(false);
-				RTLIL::Selection& sel = holes_module->design->selection_stack.back();
-				sel.select(holes_module);
-
-				Pass::call(holes_module->design, "flatten -wb");
-
-				// Cannot techmap/aigmap/check all lib_whitebox-es outside of write_xaiger
-				//   since boxes may contain parameters in which case `flatten` would have
-				//   created a new $paramod ...
-				Pass::call(holes_module->design, "techmap");
-				Pass::call(holes_module->design, "aigmap");
-				for (auto cell : holes_module->cells())
-					if (!cell->type.in("$_NOT_", "$_AND_"))
-						log_error("Whitebox contents cannot be represented as AIG. Please verify whiteboxes are synthesisable.\n");
-
-				holes_module->design->selection_stack.pop_back();
-
-				// Move into a new (temporary) design so that "clean" will only
-				// operate (and run checks on) this one module
-				RTLIL::Design *holes_design = new RTLIL::Design;
-				holes_module->design->modules_.erase(holes_module->name);
-				holes_design->add(holes_module);
-				Pass::call(holes_design, "clean -purge");
+			f << "s";
+			buffer_str = s_buffer.str();
+			buffer_size_be = to_big_endian(buffer_str.size());
+			f.write(reinterpret_cast<const char*>(&buffer_size_be), sizeof(buffer_size_be));
+			f.write(buffer_str.data(), buffer_str.size());
 
+			if (holes_module) {
 				std::stringstream a_buffer;
-				XAigerWriter writer(holes_module, true /* holes_mode */);
+				XAigerWriter writer(holes_module);
 				writer.write_aiger(a_buffer, false /*ascii_mode*/);
 
-				delete holes_design;
-
 				f << "a";
 				std::string buffer_str = a_buffer.str();
 				int32_t buffer_size_be = to_big_endian(buffer_str.size());
 				f.write(reinterpret_cast<const char*>(&buffer_size_be), sizeof(buffer_size_be));
 				f.write(buffer_str.data(), buffer_str.size());
-
-				log_pop();
 			}
 		}
 
@@ -753,6 +647,11 @@ struct XAigerWriter
 		//f.write(buffer_str.data(), buffer_str.size());
 
 		f << stringf("Generated by %s\n", yosys_version_str);
+
+		module->design->scratchpad_set_int("write_xaiger.num_ands", and_map.size());
+		module->design->scratchpad_set_int("write_xaiger.num_wires", aig_map.size());
+		module->design->scratchpad_set_int("write_xaiger.num_inputs", input_bits.size());
+		module->design->scratchpad_set_int("write_xaiger.num_outputs", output_bits.size());
 	}
 
 	void write_map(std::ostream &f, bool verbose_map)
@@ -779,7 +678,8 @@ struct XAigerWriter
 
 				if (output_bits.count(b)) {
 					int o = ordered_outputs.at(b);
-					output_lines[o] += stringf("output %d %d %s\n", o - GetSize(co_bits), i, log_id(wire));
+					int init = 2;
+					output_lines[o] += stringf("output %d %d %s %d\n", o - GetSize(co_bits), i, log_id(wire), init);
 					continue;
 				}
 
@@ -803,8 +703,6 @@ struct XAigerWriter
 			f << stringf("box %d %d %s\n", box_count++, 0, log_id(cell->name));
 
 		output_lines.sort();
-		if (omode)
-			output_lines[State::S0] = "output 0 0 $__dummy__\n";
 		for (auto &it : output_lines)
 			f << it.second;
 		log_assert(output_lines.size() == output_bits.size());
diff --git a/frontends/aiger/aigerparse.cc b/frontends/aiger/aigerparse.cc
index cf060193d..f030933ec 100644
--- a/frontends/aiger/aigerparse.cc
+++ b/frontends/aiger/aigerparse.cc
@@ -255,7 +255,7 @@ end_of_header:
 	else
 		log_abort();
 
-	RTLIL::Wire* n0 = module->wire("\\__0__");
+	RTLIL::Wire* n0 = module->wire("$0");
 	if (n0)
 		module->connect(n0, State::S0);
 
@@ -316,14 +316,14 @@ static RTLIL::Wire* createWireIfNotExists(RTLIL::Module *module, unsigned litera
 {
 	const unsigned variable = literal >> 1;
 	const bool invert = literal & 1;
-	RTLIL::IdString wire_name(stringf("\\__%d%s__", variable, invert ? "b" : ""));
+	RTLIL::IdString wire_name(stringf("$%d%s", variable, invert ? "b" : ""));
 	RTLIL::Wire *wire = module->wire(wire_name);
 	if (wire) return wire;
 	log_debug2("Creating %s\n", wire_name.c_str());
 	wire = module->addWire(wire_name);
 	wire->port_input = wire->port_output = false;
 	if (!invert) return wire;
-	RTLIL::IdString wire_inv_name(stringf("\\__%d__", variable));
+	RTLIL::IdString wire_inv_name(stringf("$%d", variable));
 	RTLIL::Wire *wire_inv = module->wire(wire_inv_name);
 	if (wire_inv) {
 		if (module->cell(wire_inv_name)) return wire;
@@ -335,12 +335,12 @@ static RTLIL::Wire* createWireIfNotExists(RTLIL::Module *module, unsigned litera
 	}
 
 	log_debug2("Creating %s = ~%s\n", wire_name.c_str(), wire_inv_name.c_str());
-	module->addNotGate(stringf("\\__%d__$not", variable), wire_inv, wire);
+	module->addNotGate(stringf("$%d$not", variable), wire_inv, wire);
 
 	return wire;
 }
 
-void AigerReader::parse_xaiger(const dict<int,IdString> &box_lookup)
+void AigerReader::parse_xaiger()
 {
 	std::string header;
 	f >> header;
@@ -372,108 +372,117 @@ void AigerReader::parse_xaiger(const dict<int,IdString> &box_lookup)
 	else
 		log_abort();
 
-	RTLIL::Wire* n0 = module->wire("\\__0__");
+	RTLIL::Wire* n0 = module->wire("$0");
 	if (n0)
 		module->connect(n0, State::S0);
 
+	int c = f.get();
+	if (c != 'c')
+		log_error("Line %u: cannot interpret first character '%c'!\n", line_count, c);
+	if (f.peek() == '\n')
+		f.get();
+
+	dict<int,IdString> box_lookup;
+	for (auto m : design->modules()) {
+		auto it = m->attributes.find(ID(abc9_box_id));
+		if (it == m->attributes.end())
+			continue;
+		if (m->name.begins_with("$paramod"))
+			continue;
+		auto id = it->second.as_int();
+		auto r = box_lookup.insert(std::make_pair(id, m->name));
+		if (!r.second)
+			log_error("Module '%s' has the same abc9_box_id = %d value as '%s'.\n",
+					log_id(m), id, log_id(r.first->second));
+		log_assert(r.second);
+	}
+
 	// Parse footer (symbol table, comments, etc.)
 	std::string s;
-	bool comment_seen = false;
-	for (int c = f.peek(); c != EOF; c = f.peek()) {
-		if (comment_seen || c == 'c') {
-			if (!comment_seen) {
-				f.ignore(1);
-				c = f.peek();
-				comment_seen = true;
-			}
-			if (c == '\n')
-				break;
-			f.ignore(1);
-			// XAIGER extensions
-			if (c == 'm') {
-				uint32_t dataSize YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
-				uint32_t lutNum = parse_xaiger_literal(f);
-				uint32_t lutSize YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
-				log_debug("m: dataSize=%u lutNum=%u lutSize=%u\n", dataSize, lutNum, lutSize);
-				ConstEvalAig ce(module);
-				for (unsigned i = 0; i < lutNum; ++i) {
-					uint32_t rootNodeID = parse_xaiger_literal(f);
-					uint32_t cutLeavesM = parse_xaiger_literal(f);
-					log_debug2("rootNodeID=%d cutLeavesM=%d\n", rootNodeID, cutLeavesM);
-					RTLIL::Wire *output_sig = module->wire(stringf("\\__%d__", rootNodeID));
-					uint32_t nodeID;
-					RTLIL::SigSpec input_sig;
-					for (unsigned j = 0; j < cutLeavesM; ++j) {
-						nodeID = parse_xaiger_literal(f);
-						log_debug2("\t%u\n", nodeID);
-						RTLIL::Wire *wire = module->wire(stringf("\\__%d__", nodeID));
-						log_assert(wire);
-						input_sig.append(wire);
-					}
-					// TODO: Compute LUT mask from AIG in less than O(2 ** input_sig.size())
-					ce.clear();
-					ce.compute_deps(output_sig, input_sig.to_sigbit_pool());
-					RTLIL::Const lut_mask(RTLIL::State::Sx, 1 << input_sig.size());
-					for (int j = 0; j < (1 << cutLeavesM); ++j) {
-						int gray = j ^ (j >> 1);
-						ce.set_incremental(input_sig, RTLIL::Const{gray, static_cast<int>(cutLeavesM)});
-						RTLIL::SigBit o(output_sig);
-						bool success YS_ATTRIBUTE(unused) = ce.eval(o);
-						log_assert(success);
-						log_assert(o.wire == nullptr);
-						lut_mask[gray] = o.data;
-					}
-					RTLIL::Cell *output_cell = module->cell(stringf("\\__%d__$and", rootNodeID));
-					log_assert(output_cell);
-					module->remove(output_cell);
-					module->addLut(stringf("\\__%d__$lut", rootNodeID), input_sig, output_sig, std::move(lut_mask));
+	for (int c = f.get(); c != EOF; c = f.get()) {
+		// XAIGER extensions
+		if (c == 'm') {
+			uint32_t dataSize YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
+			uint32_t lutNum = parse_xaiger_literal(f);
+			uint32_t lutSize YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
+			log_debug("m: dataSize=%u lutNum=%u lutSize=%u\n", dataSize, lutNum, lutSize);
+			ConstEvalAig ce(module);
+			for (unsigned i = 0; i < lutNum; ++i) {
+				uint32_t rootNodeID = parse_xaiger_literal(f);
+				uint32_t cutLeavesM = parse_xaiger_literal(f);
+				log_debug2("rootNodeID=%d cutLeavesM=%d\n", rootNodeID, cutLeavesM);
+				RTLIL::Wire *output_sig = module->wire(stringf("$%d", rootNodeID));
+				uint32_t nodeID;
+				RTLIL::SigSpec input_sig;
+				for (unsigned j = 0; j < cutLeavesM; ++j) {
+					nodeID = parse_xaiger_literal(f);
+					log_debug2("\t%u\n", nodeID);
+					RTLIL::Wire *wire = module->wire(stringf("$%d", nodeID));
+					log_assert(wire);
+					input_sig.append(wire);
 				}
-			}
-			else if (c == 'r') {
-				uint32_t dataSize YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
-				flopNum = parse_xaiger_literal(f);
-				log_debug("flopNum: %u\n", flopNum);
-				log_assert(dataSize == (flopNum+1) * sizeof(uint32_t));
-				f.ignore(flopNum * sizeof(uint32_t));
-			}
-			else if (c == 'n') {
-				parse_xaiger_literal(f);
-				f >> s;
-				log_debug("n: '%s'\n", s.c_str());
-			}
-			else if (c == 'h') {
-				f.ignore(sizeof(uint32_t));
-				uint32_t version YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
-				log_assert(version == 1);
-				uint32_t ciNum YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
-				log_debug("ciNum = %u\n", ciNum);
-				uint32_t coNum YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
-				log_debug("coNum = %u\n", coNum);
-				piNum = parse_xaiger_literal(f);
-				log_debug("piNum = %u\n", piNum);
-				uint32_t poNum YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
-				log_debug("poNum = %u\n", poNum);
-				uint32_t boxNum = parse_xaiger_literal(f);
-				log_debug("boxNum = %u\n", boxNum);
-				for (unsigned i = 0; i < boxNum; i++) {
-					f.ignore(2*sizeof(uint32_t));
-					uint32_t boxUniqueId = parse_xaiger_literal(f);
-					log_assert(boxUniqueId > 0);
-					uint32_t oldBoxNum = parse_xaiger_literal(f);
-					RTLIL::Cell* cell = module->addCell(stringf("$__box%u__", oldBoxNum), box_lookup.at(boxUniqueId));
-					boxes.emplace_back(cell);
+				// TODO: Compute LUT mask from AIG in less than O(2 ** input_sig.size())
+				ce.clear();
+				ce.compute_deps(output_sig, input_sig.to_sigbit_pool());
+				RTLIL::Const lut_mask(RTLIL::State::Sx, 1 << input_sig.size());
+				for (int j = 0; j < (1 << cutLeavesM); ++j) {
+					int gray = j ^ (j >> 1);
+					ce.set_incremental(input_sig, RTLIL::Const{gray, static_cast<int>(cutLeavesM)});
+					RTLIL::SigBit o(output_sig);
+					bool success YS_ATTRIBUTE(unused) = ce.eval(o);
+					log_assert(success);
+					log_assert(o.wire == nullptr);
+					lut_mask[gray] = o.data;
 				}
+				RTLIL::Cell *output_cell = module->cell(stringf("$%d$and", rootNodeID));
+				log_assert(output_cell);
+				module->remove(output_cell);
+				module->addLut(stringf("$%d$lut", rootNodeID), input_sig, output_sig, std::move(lut_mask));
 			}
-			else if (c == 'a' || c == 'i' || c == 'o') {
-				uint32_t dataSize = parse_xaiger_literal(f);
-				f.ignore(dataSize);
-			}
-			else {
-				break;
+		}
+		else if (c == 'r') {
+			uint32_t dataSize YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
+			flopNum = parse_xaiger_literal(f);
+			log_debug("flopNum = %u\n", flopNum);
+			log_assert(dataSize == (flopNum+1) * sizeof(uint32_t));
+			f.ignore(flopNum * sizeof(uint32_t));
+		}
+		else if (c == 'n') {
+			parse_xaiger_literal(f);
+			f >> s;
+			log_debug("n: '%s'\n", s.c_str());
+		}
+		else if (c == 'h') {
+			f.ignore(sizeof(uint32_t));
+			uint32_t version YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
+			log_assert(version == 1);
+			uint32_t ciNum YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
+			log_debug("ciNum = %u\n", ciNum);
+			uint32_t coNum YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
+			log_debug("coNum = %u\n", coNum);
+			piNum = parse_xaiger_literal(f);
+			log_debug("piNum = %u\n", piNum);
+			uint32_t poNum YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
+			log_debug("poNum = %u\n", poNum);
+			uint32_t boxNum = parse_xaiger_literal(f);
+			log_debug("boxNum = %u\n", boxNum);
+			for (unsigned i = 0; i < boxNum; i++) {
+				f.ignore(2*sizeof(uint32_t));
+				uint32_t boxUniqueId = parse_xaiger_literal(f);
+				log_assert(boxUniqueId > 0);
+				uint32_t oldBoxNum = parse_xaiger_literal(f);
+				RTLIL::Cell* cell = module->addCell(stringf("$box%u", oldBoxNum), box_lookup.at(boxUniqueId));
+				boxes.emplace_back(cell);
 			}
 		}
-		else
-			log_error("Line %u: cannot interpret first character '%c'!\n", line_count, c);
+		else if (c == 'a' || c == 'i' || c == 'o' || c == 's') {
+			uint32_t dataSize = parse_xaiger_literal(f);
+			f.ignore(dataSize);
+			log_debug("ignoring '%c'\n", c);
+		}
+		else {
+			break;
+		}
 	}
 
 	post_process();
@@ -550,7 +559,7 @@ void AigerReader::parse_aiger_ascii()
 		log_debug2("%d is an output\n", l1);
 		const unsigned variable = l1 >> 1;
 		const bool invert = l1 & 1;
-		RTLIL::IdString wire_name(stringf("\\__%d%s__", variable, invert ? "b" : "")); // FIXME: is "b" the right suffix?
+		RTLIL::IdString wire_name(stringf("$%d%s", variable, invert ? "b" : "")); // FIXME: is "b" the right suffix?
 		RTLIL::Wire *wire = module->wire(wire_name);
 		if (!wire)
 			wire = createWireIfNotExists(module, l1);
@@ -616,11 +625,12 @@ void AigerReader::parse_aiger_binary()
 	std::string line;
 
 	// Parse inputs
+	int digits = ceil(log10(I));
 	for (unsigned i = 1; i <= I; ++i) {
 		log_debug2("%d is an input\n", i);
-		RTLIL::Wire *wire = createWireIfNotExists(module, i << 1);
+		RTLIL::Wire *wire = module->addWire(stringf("$i%0*d", digits, i));
 		wire->port_input = true;
-		log_assert(!wire->port_output);
+		module->connect(createWireIfNotExists(module, i << 1), wire);
 		inputs.push_back(wire);
 	}
 
@@ -670,23 +680,15 @@ void AigerReader::parse_aiger_binary()
 	}
 
 	// Parse outputs
+	digits = ceil(log10(O));
 	for (unsigned i = 0; i < O; ++i, ++line_count) {
 		if (!(f >> l1))
 			log_error("Line %u cannot be interpreted as an output!\n", line_count);
 
 		log_debug2("%d is an output\n", l1);
-		const unsigned variable = l1 >> 1;
-		const bool invert = l1 & 1;
-		RTLIL::IdString wire_name(stringf("\\__%d%s__", variable, invert ? "b" : "")); // FIXME: is "_b" the right suffix?
-		RTLIL::Wire *wire = module->wire(wire_name);
-		if (!wire)
-			wire = createWireIfNotExists(module, l1);
-		else if (wire->port_input || wire->port_output) {
-			RTLIL::Wire *new_wire = module->addWire(NEW_ID);
-			module->connect(new_wire, wire);
-			wire = new_wire;
-		}
+		RTLIL::Wire *wire = module->addWire(stringf("$o%0*d", digits, i));
 		wire->port_output = true;
+		module->connect(wire, createWireIfNotExists(module, l1));
 		outputs.push_back(wire);
 	}
 	std::getline(f, line); // Ignore up to start of next line
@@ -733,56 +735,37 @@ void AigerReader::parse_aiger_binary()
 
 void AigerReader::post_process()
 {
-	pool<IdString> seen_boxes;
-	unsigned ci_count = 0, co_count = 0;
+	dict<IdString, std::vector<IdString>> box_ports;
+	unsigned ci_count = 0, co_count = 0, flop_count = 0;
 	for (auto cell : boxes) {
 		RTLIL::Module* box_module = design->module(cell->type);
 		log_assert(box_module);
 
-		if (seen_boxes.insert(cell->type).second) {
-			auto it = box_module->attributes.find("\\abc9_carry");
-			if (it != box_module->attributes.end()) {
-				RTLIL::Wire *carry_in = nullptr, *carry_out = nullptr;
-				auto carry_in_out = it->second.decode_string();
-				auto pos = carry_in_out.find(',');
-				if (pos == std::string::npos)
-					log_error("'abc9_carry' attribute on module '%s' does not contain ','.\n", log_id(cell->type));
-				auto carry_in_name = RTLIL::escape_id(carry_in_out.substr(0, pos));
-				carry_in = box_module->wire(carry_in_name);
-				if (!carry_in || !carry_in->port_input)
-					log_error("'abc9_carry' on module '%s' contains '%s' which does not exist or is not an input port.\n", log_id(cell->type), carry_in_name.c_str());
-
-				auto carry_out_name = RTLIL::escape_id(carry_in_out.substr(pos+1));
-				carry_out = box_module->wire(carry_out_name);
-				if (!carry_out || !carry_out->port_output)
-					log_error("'abc9_carry' on module '%s' contains '%s' which does not exist or is not an output port.\n", log_id(cell->type), carry_out_name.c_str());
-
-				auto &ports = box_module->ports;
-				for (auto jt = ports.begin(); jt != ports.end(); ) {
-					RTLIL::Wire* w = box_module->wire(*jt);
-					log_assert(w);
-					if (w == carry_in || w == carry_out) {
-						jt = ports.erase(jt);
-						continue;
-					}
-					if (w->port_id > carry_in->port_id)
-						--w->port_id;
-					if (w->port_id > carry_out->port_id)
-						--w->port_id;
-					log_assert(w->port_input || w->port_output);
-					log_assert(ports[w->port_id-1] == w->name);
-					++jt;
+		auto r = box_ports.insert(cell->type);
+		if (r.second) {
+			// Make carry in the last PI, and carry out the last PO
+			//   since ABC requires it this way
+			IdString carry_in, carry_out;
+			for (const auto &port_name : box_module->ports) {
+				auto w = box_module->wire(port_name);
+				log_assert(w);
+				if (w->get_bool_attribute("\\abc9_carry")) {
+					if (w->port_input)
+						carry_in = port_name;
+					if (w->port_output)
+						carry_out = port_name;
 				}
-				ports.push_back(carry_in->name);
-				carry_in->port_id = ports.size();
-				ports.push_back(carry_out->name);
-				carry_out->port_id = ports.size();
+				else
+					r.first->second.push_back(port_name);
+			}
+			if (carry_in != IdString()) {
+				log_assert(carry_out != IdString());
+				r.first->second.push_back(carry_in);
+				r.first->second.push_back(carry_out);
 			}
 		}
 
-		// NB: Assume box_module->ports are sorted alphabetically
-		//     (as RTLIL::Module::fixup_ports() would do)
-		for (auto port_name : box_module->ports) {
+		for (auto port_name : box_ports.at(cell->type)) {
 			RTLIL::Wire* port = box_module->wire(port_name);
 			log_assert(port);
 			RTLIL::SigSpec rhs;
@@ -804,9 +787,32 @@ void AigerReader::post_process()
 				}
 				rhs.append(wire);
 			}
-
 			cell->setPort(port_name, rhs);
 		}
+
+		if (box_module->attributes.count("\\abc9_flop")) {
+			log_assert(co_count < outputs.size());
+			Wire *wire = outputs[co_count++];
+			log_assert(wire);
+			log_assert(wire->port_output);
+			wire->port_output = false;
+
+			RTLIL::Wire *d = outputs[outputs.size() - flopNum + flop_count];
+			log_assert(d);
+			log_assert(d->port_output);
+			d->port_output = false;
+
+			RTLIL::Wire *q = inputs[piNum - flopNum + flop_count];
+			log_assert(q);
+			log_assert(q->port_input);
+			q->port_input = false;
+
+			auto ff = module->addCell(NEW_ID, "$__ABC9_FF_");
+			ff->setPort("\\D", d);
+			ff->setPort("\\Q", q);
+			flop_count++;
+			continue;
+		}
 	}
 
 	dict<RTLIL::IdString, int> wideports_cache;
@@ -868,16 +874,7 @@ void AigerReader::post_process()
 					// simply connect the latter to the former
 					RTLIL::Wire* existing = module->wire(escaped_s);
 					if (!existing) {
-						if (escaped_s.ends_with("$inout.out")) {
-							wire->port_output = false;
-							RTLIL::Wire *in_wire = module->wire(escaped_s.substr(1, escaped_s.size()-11));
-							log_assert(in_wire);
-							log_assert(in_wire->port_input && !in_wire->port_output);
-							in_wire->port_output = true;
-							module->connect(in_wire, wire);
-						}
-						else
-							module->rename(wire, escaped_s);
+						module->rename(wire, escaped_s);
 					}
 					else {
 						wire->port_output = false;
@@ -889,19 +886,9 @@ void AigerReader::post_process()
 					std::string indexed_name = stringf("%s[%d]", escaped_s.c_str(), index);
 					RTLIL::Wire* existing = module->wire(indexed_name);
 					if (!existing) {
-						if (escaped_s.ends_with("$inout.out")) {
-							wire->port_output = false;
-							RTLIL::Wire *in_wire = module->wire(stringf("%s[%d]", escaped_s.substr(1, escaped_s.size()-11).c_str(), index));
-							log_assert(in_wire);
-							log_assert(in_wire->port_input && !in_wire->port_output);
-							in_wire->port_output = true;
-							module->connect(in_wire, wire);
-						}
-						else {
-							module->rename(wire, indexed_name);
-							if (wideports)
-								wideports_cache[escaped_s] = std::max(wideports_cache[escaped_s], index);
-						}
+						module->rename(wire, indexed_name);
+						if (wideports)
+							wideports_cache[escaped_s] = std::max(wideports_cache[escaped_s], index);
 					}
 					else {
 						module->connect(wire, existing);
@@ -909,9 +896,13 @@ void AigerReader::post_process()
 					}
 				}
 				log_debug(" -> %s\n", log_id(wire));
+				int init;
+				mf >> init;
+				if (init < 2)
+					wire->attributes["\\init"] = init;
 			}
 			else if (type == "box") {
-				RTLIL::Cell* cell = module->cell(stringf("$__box%d__", variable));
+				RTLIL::Cell* cell = module->cell(stringf("$box%d", variable));
 				if (cell) { // ABC could have optimised this box away
 					module->rename(cell, escaped_s);
 					for (const auto &i : cell->connections()) {
@@ -968,15 +959,10 @@ void AigerReader::post_process()
 			if (other_wire) {
 				other_wire->port_input = false;
 				other_wire->port_output = false;
-			}
-			if (wire->port_input) {
-				if (other_wire)
+				if (wire->port_input)
 					module->connect(other_wire, SigSpec(wire, i));
-			}
-			else {
-								  // Since we skip POs that are connected to Sx,
-								  // re-connect them here
-				module->connect(SigSpec(wire, i), other_wire ? other_wire : SigSpec(RTLIL::Sx));
+				else
+					module->connect(SigSpec(wire, i), other_wire);
 			}
 		}
 	}
diff --git a/frontends/aiger/aigerparse.h b/frontends/aiger/aigerparse.h
index 583c9d0f9..de3c3efbc 100644
--- a/frontends/aiger/aigerparse.h
+++ b/frontends/aiger/aigerparse.h
@@ -47,7 +47,7 @@ struct AigerReader
 
     AigerReader(RTLIL::Design *design, std::istream &f, RTLIL::IdString module_name, RTLIL::IdString clk_name, std::string map_filename, bool wideports);
     void parse_aiger();
-    void parse_xaiger(const dict<int,IdString> &box_lookup);
+    void parse_xaiger();
     void parse_aiger_ascii();
     void parse_aiger_binary();
     void post_process();
diff --git a/kernel/rtlil.cc b/kernel/rtlil.cc
index 7c73f94c8..ab4f4f377 100644
--- a/kernel/rtlil.cc
+++ b/kernel/rtlil.cc
@@ -1893,10 +1893,6 @@ DEF_METHOD(And,      max(sig_a.size(), sig_b.size()), ID($and))
 DEF_METHOD(Or,       max(sig_a.size(), sig_b.size()), ID($or))
 DEF_METHOD(Xor,      max(sig_a.size(), sig_b.size()), ID($xor))
 DEF_METHOD(Xnor,     max(sig_a.size(), sig_b.size()), ID($xnor))
-DEF_METHOD(Shl,      sig_a.size(), ID($shl))
-DEF_METHOD(Shr,      sig_a.size(), ID($shr))
-DEF_METHOD(Sshl,     sig_a.size(), ID($sshl))
-DEF_METHOD(Sshr,     sig_a.size(), ID($sshr))
 DEF_METHOD(Shift,    sig_a.size(), ID($shift))
 DEF_METHOD(Shiftx,   sig_a.size(), ID($shiftx))
 DEF_METHOD(Lt,       1, ID($lt))
@@ -1916,6 +1912,31 @@ DEF_METHOD(LogicAnd, 1, ID($logic_and))
 DEF_METHOD(LogicOr,  1, ID($logic_or))
 #undef DEF_METHOD
 
+#define DEF_METHOD(_func, _y_size, _type) \
+	RTLIL::Cell* RTLIL::Module::add ## _func(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_b, RTLIL::SigSpec sig_y, bool is_signed, const std::string &src) { \
+		RTLIL::Cell *cell = addCell(name, _type);           \
+		cell->parameters[ID(A_SIGNED)] = is_signed;         \
+		cell->parameters[ID(B_SIGNED)] = false;             \
+		cell->parameters[ID(A_WIDTH)] = sig_a.size();       \
+		cell->parameters[ID(B_WIDTH)] = sig_b.size();       \
+		cell->parameters[ID(Y_WIDTH)] = sig_y.size();       \
+		cell->setPort(ID::A, sig_a);                        \
+		cell->setPort(ID::B, sig_b);                        \
+		cell->setPort(ID::Y, sig_y);                        \
+		cell->set_src_attribute(src);                       \
+		return cell;                                        \
+	} \
+	RTLIL::SigSpec RTLIL::Module::_func(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_b, bool is_signed, const std::string &src) { \
+		RTLIL::SigSpec sig_y = addWire(NEW_ID, _y_size);         \
+		add ## _func(name, sig_a, sig_b, sig_y, is_signed, src); \
+		return sig_y;                                            \
+	}
+DEF_METHOD(Shl,      sig_a.size(), ID($shl))
+DEF_METHOD(Shr,      sig_a.size(), ID($shr))
+DEF_METHOD(Sshl,     sig_a.size(), ID($sshl))
+DEF_METHOD(Sshr,     sig_a.size(), ID($sshr))
+#undef DEF_METHOD
+
 #define DEF_METHOD(_func, _type, _pmux) \
 	RTLIL::Cell* RTLIL::Module::add ## _func(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_b, RTLIL::SigSpec sig_s, RTLIL::SigSpec sig_y, const std::string &src) { \
 		RTLIL::Cell *cell = addCell(name, _type);                 \
diff --git a/passes/cmds/scc.cc b/passes/cmds/scc.cc
index 99f4fbae8..dd26f8258 100644
--- a/passes/cmds/scc.cc
+++ b/passes/cmds/scc.cc
@@ -301,10 +301,10 @@ struct SccPass : public Pass {
 		RTLIL::Selection newSelection(false);
 		int scc_counter = 0;
 
-		for (auto &mod_it : design->modules_)
-			if (design->selected(mod_it.second))
+		for (auto mod : design->modules())
+			if (!mod->get_blackbox_attribute() && design->selected(mod))
 			{
-				SccWorker worker(design, mod_it.second, nofeedbackMode, allCellTypes, maxDepth);
+				SccWorker worker(design, mod, nofeedbackMode, allCellTypes, maxDepth);
 
 				if (!setAttr.empty())
 				{
diff --git a/passes/techmap/Makefile.inc b/passes/techmap/Makefile.inc
index cd357d72a..734d6c10f 100644
--- a/passes/techmap/Makefile.inc
+++ b/passes/techmap/Makefile.inc
@@ -8,6 +8,8 @@ OBJS += passes/techmap/libparse.o
 ifeq ($(ENABLE_ABC),1)
 OBJS += passes/techmap/abc.o
 OBJS += passes/techmap/abc9.o
+OBJS += passes/techmap/abc9_map.o
+OBJS += passes/techmap/abc9_ops.o
 ifneq ($(ABCEXTERNAL),)
 passes/techmap/abc.o: CXXFLAGS += -DABCEXTERNAL='"$(ABCEXTERNAL)"'
 passes/techmap/abc9.o: CXXFLAGS += -DABCEXTERNAL='"$(ABCEXTERNAL)"'
diff --git a/passes/techmap/abc.cc b/passes/techmap/abc.cc
index b29480e26..7ea1138e3 100644
--- a/passes/techmap/abc.cc
+++ b/passes/techmap/abc.cc
@@ -29,17 +29,17 @@
 // Kahn, Arthur B. (1962), "Topological sorting of large networks", Communications of the ACM 5 (11): 558-562, doi:10.1145/368996.369025
 // http://en.wikipedia.org/wiki/Topological_sorting
 
-#define ABC_COMMAND_LIB "strash; ifraig; scorr; dc2; dretime; retime {D}; strash; &get -n; &dch -f; &nf {D}; &put"
-#define ABC_COMMAND_CTR "strash; ifraig; scorr; dc2; dretime; retime {D}; strash; &get -n; &dch -f; &nf {D}; &put; buffer; upsize {D}; dnsize {D}; stime -p"
-#define ABC_COMMAND_LUT "strash; ifraig; scorr; dc2; dretime; retime {D}; strash; dch -f; if; mfs2"
-#define ABC_COMMAND_SOP "strash; ifraig; scorr; dc2; dretime; retime {D}; strash; dch -f; cover {I} {P}"
-#define ABC_COMMAND_DFL "strash; ifraig; scorr; dc2; dretime; retime {D}; strash; &get -n; &dch -f; &nf {D}; &put"
-
-#define ABC_FAST_COMMAND_LIB "strash; dretime; retime {D}; map {D}"
-#define ABC_FAST_COMMAND_CTR "strash; dretime; retime {D}; map {D}; buffer; upsize {D}; dnsize {D}; stime -p"
-#define ABC_FAST_COMMAND_LUT "strash; dretime; retime {D}; if"
-#define ABC_FAST_COMMAND_SOP "strash; dretime; retime {D}; cover -I {I} -P {P}"
-#define ABC_FAST_COMMAND_DFL "strash; dretime; retime {D}; map"
+#define ABC_COMMAND_LIB "strash; ifraig; scorr; dc2; dretime; strash; &get -n; &dch -f; &nf {D}; &put"
+#define ABC_COMMAND_CTR "strash; ifraig; scorr; dc2; dretime; strash; &get -n; &dch -f; &nf {D}; &put; buffer; upsize {D}; dnsize {D}; stime -p"
+#define ABC_COMMAND_LUT "strash; ifraig; scorr; dc2; dretime; strash; dch -f; if; mfs2"
+#define ABC_COMMAND_SOP "strash; ifraig; scorr; dc2; dretime; strash; dch -f; cover {I} {P}"
+#define ABC_COMMAND_DFL "strash; ifraig; scorr; dc2; dretime; strash; &get -n; &dch -f; &nf {D}; &put"
+
+#define ABC_FAST_COMMAND_LIB "strash; dretime; map {D}"
+#define ABC_FAST_COMMAND_CTR "strash; dretime; map {D}; buffer; upsize {D}; dnsize {D}; stime -p"
+#define ABC_FAST_COMMAND_LUT "strash; dretime; if"
+#define ABC_FAST_COMMAND_SOP "strash; dretime; cover -I {I} -P {P}"
+#define ABC_FAST_COMMAND_DFL "strash; dretime; map"
 
 #include "kernel/register.h"
 #include "kernel/sigtools.h"
@@ -747,6 +747,10 @@ void abc_module(RTLIL::Design *design, RTLIL::Module *current_module, std::strin
 	else
 		abc_script += fast_mode ? ABC_FAST_COMMAND_DFL : ABC_COMMAND_DFL;
 
+	if (script_file.empty() && !delay_target.empty())
+		for (size_t pos = abc_script.find("dretime;"); pos != std::string::npos; pos = abc_script.find("dretime;", pos+1))
+			abc_script = abc_script.substr(0, pos) + "dretime; retime -o {D};" + abc_script.substr(pos+8);
+
 	for (size_t pos = abc_script.find("{D}"); pos != std::string::npos; pos = abc_script.find("{D}", pos))
 		abc_script = abc_script.substr(0, pos) + delay_target + abc_script.substr(pos+3);
 
@@ -1767,7 +1771,7 @@ struct AbcPass : public Pass {
 		extra_args(args, argidx, design);
 
 		if (!lut_costs.empty() && !liberty_file.empty())
-			log_cmd_error("Got -lut and -liberty! This two options are exclusive.\n");
+			log_cmd_error("Got -lut and -liberty! These two options are exclusive.\n");
 		if (!constr_file.empty() && liberty_file.empty())
 			log_cmd_error("Got -constr but no -liberty!\n");
 
diff --git a/passes/techmap/abc9.cc b/passes/techmap/abc9.cc
index d03e5da8e..d51ed3352 100644
--- a/passes/techmap/abc9.cc
+++ b/passes/techmap/abc9.cc
@@ -2,7 +2,7 @@
  *  yosys -- Yosys Open SYnthesis Suite
  *
  *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
- *                2019  Eddie Hung <eddie@fpgeh.com>
+ *            (C) 2019  Eddie Hung    <eddie@fpgeh.com>
  *
  *  Permission to use, copy, modify, and/or distribute this software for any
  *  purpose with or without fee is hereby granted, provided that the above
@@ -18,802 +18,21 @@
  *
  */
 
-// [[CITE]] ABC
-// Berkeley Logic Synthesis and Verification Group, ABC: A System for Sequential Synthesis and Verification
-// http://www.eecs.berkeley.edu/~alanmi/abc/
-
-#if 0
-// Based on &flow3 - better QoR but more experimental
-#define ABC_COMMAND_LUT "&st; &ps -l; &sweep -v; &scorr; " \
-						"&st; &if {W}; &save; &st; &syn2; &if {W} -v; &save; &load; "\
-						"&st; &if -g -K 6; &dch -f; &if {W} -v; &save; &load; "\
-						"&st; &if -g -K 6; &synch2; &if {W} -v; &save; &load; "\
-						"&mfs; &ps -l"
-#else
-#define ABC_COMMAND_LUT "&st; &scorr; &sweep; &dc2; &st; &dch -f; &ps; &if {W} {D} -v; &mfs; &ps -l"
-#endif
-
-
-#define ABC_FAST_COMMAND_LUT "&st; &if {W} {D}"
-
 #include "kernel/register.h"
-#include "kernel/sigtools.h"
 #include "kernel/celltypes.h"
-#include "kernel/cost.h"
+#include "kernel/rtlil.h"
 #include "kernel/log.h"
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <cerrno>
-#include <sstream>
-#include <climits>
-
-#ifndef _WIN32
-#  include <unistd.h>
-#  include <dirent.h>
-#endif
-
-#include "frontends/aiger/aigerparse.h"
-#include "kernel/utils.h"
-
-#ifdef YOSYS_LINK_ABC
-extern "C" int Abc_RealMain(int argc, char *argv[]);
-#endif
 
 USING_YOSYS_NAMESPACE
 PRIVATE_NAMESPACE_BEGIN
 
-bool markgroups;
-int map_autoidx;
-SigMap assign_map;
-RTLIL::Module *module;
-
-bool clk_polarity, en_polarity;
-RTLIL::SigSpec clk_sig, en_sig;
-
-inline std::string remap_name(RTLIL::IdString abc9_name)
-{
-	return stringf("$abc$%d$%s", map_autoidx, abc9_name.c_str()+1);
-}
-
-void handle_loops(RTLIL::Design *design)
-{
-	Pass::call(design, "scc -set_attr abc9_scc_id {}");
-
-	// For every unique SCC found, (arbitrarily) find the first
-	// cell in the component, and select (and mark) all its output
-	// wires
-	pool<RTLIL::Const> ids_seen;
-	for (auto cell : module->cells()) {
-		auto it = cell->attributes.find(ID(abc9_scc_id));
-		if (it != cell->attributes.end()) {
-			auto r = ids_seen.insert(it->second);
-			if (r.second) {
-				for (auto &c : cell->connections_) {
-					if (c.second.is_fully_const()) continue;
-					if (cell->output(c.first)) {
-						SigBit b = c.second.as_bit();
-						Wire *w = b.wire;
-						if (w->port_input) {
-							// In this case, hopefully the loop break has been already created
-							// Get the non-prefixed wire
-							Wire *wo = module->wire(stringf("%s.abco", b.wire->name.c_str()));
-							log_assert(wo != nullptr);
-							log_assert(wo->port_output);
-							log_assert(b.offset < GetSize(wo));
-							c.second = RTLIL::SigBit(wo, b.offset);
-						}
-						else {
-							// Create a new output/input loop break
-							w->port_input = true;
-							w = module->wire(stringf("%s.abco", w->name.c_str()));
-							if (!w) {
-								w = module->addWire(stringf("%s.abco", b.wire->name.c_str()), GetSize(b.wire));
-								w->port_output = true;
-							}
-							else {
-								log_assert(w->port_input);
-								log_assert(b.offset < GetSize(w));
-							}
-							w->set_bool_attribute(ID(abc9_scc_break));
-							c.second = RTLIL::SigBit(w, b.offset);
-						}
-					}
-				}
-			}
-			cell->attributes.erase(it);
-		}
-	}
-
-	module->fixup_ports();
-}
-
-std::string add_echos_to_abc9_cmd(std::string str)
-{
-	std::string new_str, token;
-	for (size_t i = 0; i < str.size(); i++) {
-		token += str[i];
-		if (str[i] == ';') {
-			while (i+1 < str.size() && str[i+1] == ' ')
-				i++;
-			new_str += "echo + " + token + " " + token + " ";
-			token.clear();
-		}
-	}
-
-	if (!token.empty()) {
-		if (!new_str.empty())
-			new_str += "echo + " + token + "; ";
-		new_str += token;
-	}
-
-	return new_str;
-}
+#define XC7_WIRE_DELAY 300 // Number with which ABC will map a 6-input gate
+                           // to one LUT6 (instead of a LUT5 + LUT2)
 
-std::string fold_abc9_cmd(std::string str)
+struct Abc9Pass : public ScriptPass
 {
-	std::string token, new_str = "          ";
-	int char_counter = 10;
-
-	for (size_t i = 0; i <= str.size(); i++) {
-		if (i < str.size())
-			token += str[i];
-		if (i == str.size() || str[i] == ';') {
-			if (char_counter + token.size() > 75)
-				new_str += "\n              ", char_counter = 14;
-			new_str += token, char_counter += token.size();
-			token.clear();
-		}
-	}
-
-	return new_str;
-}
-
-std::string replace_tempdir(std::string text, std::string tempdir_name, bool show_tempdir)
-{
-	if (show_tempdir)
-		return text;
-
-	while (1) {
-		size_t pos = text.find(tempdir_name);
-		if (pos == std::string::npos)
-			break;
-		text = text.substr(0, pos) + "<abc-temp-dir>" + text.substr(pos + GetSize(tempdir_name));
-	}
-
-	std::string  selfdir_name = proc_self_dirname();
-	if (selfdir_name != "/") {
-		while (1) {
-			size_t pos = text.find(selfdir_name);
-			if (pos == std::string::npos)
-				break;
-			text = text.substr(0, pos) + "<yosys-exe-dir>/" + text.substr(pos + GetSize(selfdir_name));
-		}
-	}
-
-	return text;
-}
-
-struct abc9_output_filter
-{
-	bool got_cr;
-	int escape_seq_state;
-	std::string linebuf;
-	std::string tempdir_name;
-	bool show_tempdir;
-
-	abc9_output_filter(std::string tempdir_name, bool show_tempdir) : tempdir_name(tempdir_name), show_tempdir(show_tempdir)
-	{
-		got_cr = false;
-		escape_seq_state = 0;
-	}
-
-	void next_char(char ch)
-	{
-		if (escape_seq_state == 0 && ch == '\033') {
-			escape_seq_state = 1;
-			return;
-		}
-		if (escape_seq_state == 1) {
-			escape_seq_state = ch == '[' ? 2 : 0;
-			return;
-		}
-		if (escape_seq_state == 2) {
-			if ((ch < '0' || '9' < ch) && ch != ';')
-				escape_seq_state = 0;
-			return;
-		}
-		escape_seq_state = 0;
-		if (ch == '\r') {
-			got_cr = true;
-			return;
-		}
-		if (ch == '\n') {
-			log("ABC: %s\n", replace_tempdir(linebuf, tempdir_name, show_tempdir).c_str());
-			got_cr = false, linebuf.clear();
-			return;
-		}
-		if (got_cr)
-			got_cr = false, linebuf.clear();
-		linebuf += ch;
-	}
-
-	void next_line(const std::string &line)
-	{
-		//int pi, po;
-		//if (sscanf(line.c_str(), "Start-point = pi%d.  End-point = po%d.", &pi, &po) == 2) {
-		//	log("ABC: Start-point = pi%d (%s).  End-point = po%d (%s).\n",
-		//			pi, pi_map.count(pi) ? pi_map.at(pi).c_str() : "???",
-		//			po, po_map.count(po) ? po_map.at(po).c_str() : "???");
-		//	return;
-		//}
-
-		for (char ch : line)
-			next_char(ch);
-	}
-};
-
-void abc9_module(RTLIL::Design *design, RTLIL::Module *current_module, std::string script_file, std::string exe_file,
-		bool cleanup, vector<int> lut_costs, bool dff_mode, std::string clk_str,
-		bool /*keepff*/, std::string delay_target, std::string /*lutin_shared*/, bool fast_mode,
-		bool show_tempdir, std::string box_file, std::string lut_file,
-		std::string wire_delay, const dict<int,IdString> &box_lookup, bool nomfs
-)
-{
-	module = current_module;
-	map_autoidx = autoidx++;
-
-	if (clk_str != "$")
-	{
-		clk_polarity = true;
-		clk_sig = RTLIL::SigSpec();
-
-		en_polarity = true;
-		en_sig = RTLIL::SigSpec();
-	}
-
-	if (!clk_str.empty() && clk_str != "$")
-	{
-		if (clk_str.find(',') != std::string::npos) {
-			int pos = clk_str.find(',');
-			std::string en_str = clk_str.substr(pos+1);
-			clk_str = clk_str.substr(0, pos);
-			if (en_str[0] == '!') {
-				en_polarity = false;
-				en_str = en_str.substr(1);
-			}
-			if (module->wires_.count(RTLIL::escape_id(en_str)) != 0)
-				en_sig = assign_map(RTLIL::SigSpec(module->wires_.at(RTLIL::escape_id(en_str)), 0));
-		}
-		if (clk_str[0] == '!') {
-			clk_polarity = false;
-			clk_str = clk_str.substr(1);
-		}
-		if (module->wires_.count(RTLIL::escape_id(clk_str)) != 0)
-			clk_sig = assign_map(RTLIL::SigSpec(module->wires_.at(RTLIL::escape_id(clk_str)), 0));
-	}
-
-	if (dff_mode && clk_sig.empty())
-		log_cmd_error("Clock domain %s not found.\n", clk_str.c_str());
-
-	std::string tempdir_name = "/tmp/yosys-abc-XXXXXX";
-	if (!cleanup)
-		tempdir_name[0] = tempdir_name[4] = '_';
-	tempdir_name = make_temp_dir(tempdir_name);
-	log_header(design, "Extracting gate netlist of module `%s' to `%s/input.xaig'..\n",
-			module->name.c_str(), replace_tempdir(tempdir_name, tempdir_name, show_tempdir).c_str());
-
-	std::string abc9_script;
-
-	if (!lut_costs.empty()) {
-		abc9_script += stringf("read_lut %s/lutdefs.txt; ", tempdir_name.c_str());
-		if (!box_file.empty())
-			abc9_script += stringf("read_box -v %s; ", box_file.c_str());
-	}
-	else
-	if (!lut_file.empty()) {
-		abc9_script += stringf("read_lut %s; ", lut_file.c_str());
-		if (!box_file.empty())
-			abc9_script += stringf("read_box -v %s; ", box_file.c_str());
-	}
-	else
-		log_abort();
-
-	abc9_script += stringf("&read %s/input.xaig; &ps; ", tempdir_name.c_str());
-
-	if (!script_file.empty()) {
-		if (script_file[0] == '+') {
-			for (size_t i = 1; i < script_file.size(); i++)
-				if (script_file[i] == '\'')
-					abc9_script += "'\\''";
-				else if (script_file[i] == ',')
-					abc9_script += " ";
-				else
-					abc9_script += script_file[i];
-		} else
-			abc9_script += stringf("source %s", script_file.c_str());
-	} else if (!lut_costs.empty() || !lut_file.empty()) {
-		//bool all_luts_cost_same = true;
-		//for (int this_cost : lut_costs)
-		//	if (this_cost != lut_costs.front())
-		//		all_luts_cost_same = false;
-		abc9_script += fast_mode ? ABC_FAST_COMMAND_LUT : ABC_COMMAND_LUT;
-		//if (all_luts_cost_same && !fast_mode)
-		//	abc9_script += "; lutpack {S}";
-	} else
-		log_abort();
-
-	//if (script_file.empty() && !delay_target.empty())
-	//	for (size_t pos = abc9_script.find("dretime;"); pos != std::string::npos; pos = abc9_script.find("dretime;", pos+1))
-	//		abc9_script = abc9_script.substr(0, pos) + "dretime; retime -o {D};" + abc9_script.substr(pos+8);
-
-	for (size_t pos = abc9_script.find("{D}"); pos != std::string::npos; pos = abc9_script.find("{D}", pos))
-		abc9_script = abc9_script.substr(0, pos) + delay_target + abc9_script.substr(pos+3);
-
-	//for (size_t pos = abc9_script.find("{S}"); pos != std::string::npos; pos = abc9_script.find("{S}", pos))
-	//	abc9_script = abc9_script.substr(0, pos) + lutin_shared + abc9_script.substr(pos+3);
-
-	for (size_t pos = abc9_script.find("{W}"); pos != std::string::npos; pos = abc9_script.find("{W}", pos))
-		abc9_script = abc9_script.substr(0, pos) + wire_delay + abc9_script.substr(pos+3);
-
-	if (nomfs)
-		for (size_t pos = abc9_script.find("&mfs"); pos != std::string::npos; pos = abc9_script.find("&mfs", pos))
-			abc9_script = abc9_script.erase(pos, strlen("&mfs"));
-
-	abc9_script += stringf("; &write %s/output.aig", tempdir_name.c_str());
-	abc9_script = add_echos_to_abc9_cmd(abc9_script);
-
-	for (size_t i = 0; i+1 < abc9_script.size(); i++)
-		if (abc9_script[i] == ';' && abc9_script[i+1] == ' ')
-			abc9_script[i+1] = '\n';
-
-	FILE *f = fopen(stringf("%s/abc.script", tempdir_name.c_str()).c_str(), "wt");
-	fprintf(f, "%s\n", abc9_script.c_str());
-	fclose(f);
-
-	if (dff_mode || !clk_str.empty())
-	{
-		if (clk_sig.size() == 0)
-			log("No%s clock domain found. Not extracting any FF cells.\n", clk_str.empty() ? "" : " matching");
-		else {
-			log("Found%s %s clock domain: %s", clk_str.empty() ? "" : " matching", clk_polarity ? "posedge" : "negedge", log_signal(clk_sig));
-			if (en_sig.size() != 0)
-				log(", enabled by %s%s", en_polarity ? "" : "!", log_signal(en_sig));
-			log("\n");
-		}
-	}
-
-	bool count_output = false;
-	for (auto port_name : module->ports) {
-		RTLIL::Wire *port_wire = module->wire(port_name);
-		log_assert(port_wire);
-		if (port_wire->port_output) {
-			count_output = true;
-			break;
-		}
-	}
-
-	log_push();
-
-	if (count_output)
-	{
-		design->selection_stack.emplace_back(false);
-		RTLIL::Selection& sel = design->selection_stack.back();
-		sel.select(module);
-
-		handle_loops(design);
-
-		Pass::call(design, "aigmap");
-
-		//log("Extracted %d gates and %d wires to a netlist network with %d inputs and %d outputs.\n",
-		//		count_gates, GetSize(signal_list), count_input, count_output);
-
-		Pass::call(design, stringf("write_xaiger -map %s/input.sym %s/input.xaig", tempdir_name.c_str(), tempdir_name.c_str()));
-
-		std::string buffer;
-		std::ifstream ifs;
-#if 0
-		buffer = stringf("%s/%s", tempdir_name.c_str(), "input.xaig");
-		ifs.open(buffer);
-		if (ifs.fail())
-			log_error("Can't open ABC output file `%s'.\n", buffer.c_str());
-		buffer = stringf("%s/%s", tempdir_name.c_str(), "input.sym");
-		log_assert(!design->module(ID($__abc9__)));
-		{
-			AigerReader reader(design, ifs, ID($__abc9__), "" /* clk_name */, buffer.c_str() /* map_filename */, true /* wideports */);
-			reader.parse_xaiger();
-		}
-		ifs.close();
-		Pass::call(design, stringf("write_verilog -noexpr -norename"));
-		design->remove(design->module(ID($__abc9__)));
-#endif
-
-		design->selection_stack.pop_back();
-
-		log_header(design, "Executing ABC9.\n");
-
-		if (!lut_costs.empty()) {
-			buffer = stringf("%s/lutdefs.txt", tempdir_name.c_str());
-			f = fopen(buffer.c_str(), "wt");
-			if (f == NULL)
-				log_error("Opening %s for writing failed: %s\n", buffer.c_str(), strerror(errno));
-			for (int i = 0; i < GetSize(lut_costs); i++)
-				fprintf(f, "%d %d.00 1.00\n", i+1, lut_costs.at(i));
-			fclose(f);
-		}
-
-		buffer = stringf("%s -s -f %s/abc.script 2>&1", exe_file.c_str(), tempdir_name.c_str());
-		log("Running ABC command: %s\n", replace_tempdir(buffer, tempdir_name, show_tempdir).c_str());
-
-#ifndef YOSYS_LINK_ABC
-		abc9_output_filter filt(tempdir_name, show_tempdir);
-		int ret = run_command(buffer, std::bind(&abc9_output_filter::next_line, filt, std::placeholders::_1));
-#else
-		// These needs to be mutable, supposedly due to getopt
-		char *abc9_argv[5];
-		string tmp_script_name = stringf("%s/abc.script", tempdir_name.c_str());
-		abc9_argv[0] = strdup(exe_file.c_str());
-		abc9_argv[1] = strdup("-s");
-		abc9_argv[2] = strdup("-f");
-		abc9_argv[3] = strdup(tmp_script_name.c_str());
-		abc9_argv[4] = 0;
-		int ret = Abc_RealMain(4, abc9_argv);
-		free(abc9_argv[0]);
-		free(abc9_argv[1]);
-		free(abc9_argv[2]);
-		free(abc9_argv[3]);
-#endif
-		if (ret != 0)
-			log_error("ABC: execution of command \"%s\" failed: return code %d.\n", buffer.c_str(), ret);
-
-		buffer = stringf("%s/%s", tempdir_name.c_str(), "output.aig");
-		ifs.open(buffer, std::ifstream::binary);
-		if (ifs.fail())
-			log_error("Can't open ABC output file `%s'.\n", buffer.c_str());
-
-		buffer = stringf("%s/%s", tempdir_name.c_str(), "input.sym");
-		log_assert(!design->module(ID($__abc9__)));
-
-		AigerReader reader(design, ifs, ID($__abc9__), "" /* clk_name */, buffer.c_str() /* map_filename */, true /* wideports */);
-		reader.parse_xaiger(box_lookup);
-		ifs.close();
-
-#if 0
-		Pass::call(design, stringf("write_verilog -noexpr -norename"));
-#endif
-
-		log_header(design, "Re-integrating ABC9 results.\n");
-		RTLIL::Module *mapped_mod = design->module(ID($__abc9__));
-		if (mapped_mod == NULL)
-			log_error("ABC output file does not contain a module `$__abc9__'.\n");
-
-		pool<RTLIL::SigBit> output_bits;
-		for (auto &it : mapped_mod->wires_) {
-			RTLIL::Wire *w = it.second;
-			RTLIL::Wire *remap_wire = module->addWire(remap_name(w->name), GetSize(w));
-			if (markgroups) remap_wire->attributes[ID(abcgroup)] = map_autoidx;
-			if (w->port_output) {
-				RTLIL::Wire *wire = module->wire(w->name);
-				log_assert(wire);
-				for (int i = 0; i < GetSize(w); i++)
-					output_bits.insert({wire, i});
-			}
-		}
-
-		for (auto &it : module->connections_) {
-			auto &signal = it.first;
-			auto bits = signal.bits();
-			for (auto &b : bits)
-				if (output_bits.count(b))
-					b = module->addWire(NEW_ID);
-			signal = std::move(bits);
-		}
-
-		dict<IdString, bool> abc9_box;
-		vector<RTLIL::Cell*> boxes;
-		for (const auto &it : module->cells_) {
-			auto cell = it.second;
-			if (cell->type.in(ID($_AND_), ID($_NOT_))) {
-				module->remove(cell);
-				continue;
-			}
-			auto jt = abc9_box.find(cell->type);
-			if (jt == abc9_box.end()) {
-				RTLIL::Module* box_module = design->module(cell->type);
-				jt = abc9_box.insert(std::make_pair(cell->type, box_module && box_module->attributes.count(ID(abc9_box_id)))).first;
-			}
-			if (jt->second)
-				boxes.emplace_back(cell);
-		}
-
-		dict<SigBit, pool<IdString>> bit_drivers, bit_users;
-		TopoSort<IdString, RTLIL::sort_by_id_str> toposort;
-		dict<RTLIL::Cell*,RTLIL::Cell*> not2drivers;
-		dict<SigBit, std::vector<RTLIL::Cell*>> bit2sinks;
-
-		std::map<IdString, int> cell_stats;
-		for (auto c : mapped_mod->cells())
-		{
-			toposort.node(c->name);
-
-			RTLIL::Cell *cell = nullptr;
-			if (c->type == ID($_NOT_)) {
-				RTLIL::SigBit a_bit = c->getPort(ID::A);
-				RTLIL::SigBit y_bit = c->getPort(ID::Y);
-				bit_users[a_bit].insert(c->name);
-				bit_drivers[y_bit].insert(c->name);
-
-				if (!a_bit.wire) {
-					c->setPort(ID::Y, module->addWire(NEW_ID));
-					RTLIL::Wire *wire = module->wire(remap_name(y_bit.wire->name));
-					log_assert(wire);
-					module->connect(RTLIL::SigBit(wire, y_bit.offset), State::S1);
-				}
-				else if (!lut_costs.empty() || !lut_file.empty()) {
-					RTLIL::Cell* driver_lut = nullptr;
-					// ABC can return NOT gates that drive POs
-					if (!a_bit.wire->port_input) {
-						// If it's not a NOT gate that that comes from a PI directly,
-						// find the driver LUT and clone that to guarantee that we won't
-						// increase the max logic depth
-						// (TODO: Optimise by not cloning unless will increase depth)
-						RTLIL::IdString driver_name;
-						if (GetSize(a_bit.wire) == 1)
-							driver_name = stringf("%s$lut", a_bit.wire->name.c_str());
-						else
-							driver_name = stringf("%s[%d]$lut", a_bit.wire->name.c_str(), a_bit.offset);
-						driver_lut = mapped_mod->cell(driver_name);
-					}
-
-					if (!driver_lut) {
-						// If a driver couldn't be found (could be from PI or box CI)
-						// then implement using a LUT
-						cell = module->addLut(remap_name(stringf("%s$lut", c->name.c_str())),
-								RTLIL::SigBit(module->wires_.at(remap_name(a_bit.wire->name)), a_bit.offset),
-								RTLIL::SigBit(module->wires_.at(remap_name(y_bit.wire->name)), y_bit.offset),
-								RTLIL::Const::from_string("01"));
-						bit2sinks[cell->getPort(ID::A)].push_back(cell);
-						cell_stats[ID($lut)]++;
-					}
-					else
-						not2drivers[c] = driver_lut;
-					continue;
-				}
-				else
-					log_abort();
-				if (cell && markgroups) cell->attributes[ID(abcgroup)] = map_autoidx;
-				continue;
-			}
-			cell_stats[c->type]++;
-
-			RTLIL::Cell *existing_cell = nullptr;
-			if (c->type == ID($lut)) {
-				if (GetSize(c->getPort(ID::A)) == 1 && c->getParam(ID(LUT)) == RTLIL::Const::from_string("01")) {
-					SigSpec my_a = module->wires_.at(remap_name(c->getPort(ID::A).as_wire()->name));
-					SigSpec my_y = module->wires_.at(remap_name(c->getPort(ID::Y).as_wire()->name));
-					module->connect(my_y, my_a);
-					if (markgroups) c->attributes[ID(abcgroup)] = map_autoidx;
-					log_abort();
-					continue;
-				}
-				cell = module->addCell(remap_name(c->name), c->type);
-			}
-			else {
-				existing_cell = module->cell(c->name);
-				log_assert(existing_cell);
-				cell = module->addCell(remap_name(c->name), c->type);
-			}
-
-			if (markgroups) cell->attributes[ID(abcgroup)] = map_autoidx;
-			if (existing_cell) {
-				cell->parameters = existing_cell->parameters;
-				cell->attributes = existing_cell->attributes;
-			}
-			else {
-				cell->parameters = c->parameters;
-				cell->attributes = c->attributes;
-			}
-			for (auto &conn : c->connections()) {
-				RTLIL::SigSpec newsig;
-				for (auto c : conn.second.chunks()) {
-					if (c.width == 0)
-						continue;
-					//log_assert(c.width == 1);
-					if (c.wire)
-						c.wire = module->wires_.at(remap_name(c.wire->name));
-					newsig.append(c);
-				}
-				cell->setPort(conn.first, newsig);
-
-				if (cell->input(conn.first)) {
-					for (auto i : newsig)
-						bit2sinks[i].push_back(cell);
-					for (auto i : conn.second)
-						bit_users[i].insert(c->name);
-				}
-				if (cell->output(conn.first))
-					for (auto i : conn.second)
-						bit_drivers[i].insert(c->name);
-			}
-		}
-
-		for (auto existing_cell : boxes) {
-			Cell *cell = module->cell(remap_name(existing_cell->name));
-			if (cell) {
-				for (auto &conn : existing_cell->connections()) {
-					if (!conn.second.is_wire())
-						continue;
-					Wire *wire = conn.second.as_wire();
-					if (!wire->get_bool_attribute(ID(abc9_padding)))
-						continue;
-					cell->unsetPort(conn.first);
-					log_debug("Dropping padded port connection for %s (%s) .%s (%s )\n", log_id(cell), cell->type.c_str(), log_id(conn.first), log_signal(conn.second));
-				}
-				module->swap_names(cell, existing_cell);
-			}
-			module->remove(existing_cell);
-		}
-
-		// Copy connections (and rename) from mapped_mod to module
-		for (auto conn : mapped_mod->connections()) {
-			if (!conn.first.is_fully_const()) {
-				auto chunks = conn.first.chunks();
-				for (auto &c : chunks)
-					c.wire = module->wires_.at(remap_name(c.wire->name));
-				conn.first = std::move(chunks);
-			}
-			if (!conn.second.is_fully_const()) {
-				auto chunks = conn.second.chunks();
-				for (auto &c : chunks)
-					if (c.wire)
-						c.wire = module->wires_.at(remap_name(c.wire->name));
-				conn.second = std::move(chunks);
-			}
-			module->connect(conn);
-		}
-
-		for (auto &it : cell_stats)
-			log("ABC RESULTS:   %15s cells: %8d\n", it.first.c_str(), it.second);
-		int in_wires = 0, out_wires = 0;
-
-		// Stitch in mapped_mod's inputs/outputs into module
-		for (auto port : mapped_mod->ports) {
-			RTLIL::Wire *w = mapped_mod->wire(port);
-			RTLIL::Wire *wire = module->wire(port);
-			log_assert(wire);
-			RTLIL::Wire *remap_wire = module->wire(remap_name(port));
-			RTLIL::SigSpec signal = RTLIL::SigSpec(wire, 0, GetSize(remap_wire));
-			log_assert(GetSize(signal) >= GetSize(remap_wire));
-
-			RTLIL::SigSig conn;
-			if (w->port_output) {
-				conn.first = signal;
-				conn.second = remap_wire;
-				out_wires++;
-				module->connect(conn);
-			}
-			else if (w->port_input) {
-				conn.first = remap_wire;
-				conn.second = signal;
-				in_wires++;
-				module->connect(conn);
-			}
-		}
-
-		for (auto &it : bit_users)
-			if (bit_drivers.count(it.first))
-				for (auto driver_cell : bit_drivers.at(it.first))
-				for (auto user_cell : it.second)
-					toposort.edge(driver_cell, user_cell);
-		bool no_loops YS_ATTRIBUTE(unused) = toposort.sort();
-		log_assert(no_loops);
+	Abc9Pass() : ScriptPass("abc9", "use ABC9 for technology mapping") { }
 
-		for (auto ii = toposort.sorted.rbegin(); ii != toposort.sorted.rend(); ii++) {
-			RTLIL::Cell *not_cell = mapped_mod->cell(*ii);
-			log_assert(not_cell);
-			if (not_cell->type != ID($_NOT_))
-				continue;
-			auto it = not2drivers.find(not_cell);
-			if (it == not2drivers.end())
-				continue;
-			RTLIL::Cell *driver_lut = it->second;
-			RTLIL::SigBit a_bit = not_cell->getPort(ID::A);
-			RTLIL::SigBit y_bit = not_cell->getPort(ID::Y);
-			RTLIL::Const driver_mask;
-
-			a_bit.wire = module->wires_.at(remap_name(a_bit.wire->name));
-			y_bit.wire = module->wires_.at(remap_name(y_bit.wire->name));
-
-			auto jt = bit2sinks.find(a_bit);
-			if (jt == bit2sinks.end())
-				goto clone_lut;
-
-			for (auto sink_cell : jt->second)
-				if (sink_cell->type != ID($lut))
-					goto clone_lut;
-
-			// Push downstream LUTs past inverter
-			for (auto sink_cell : jt->second) {
-				SigSpec A = sink_cell->getPort(ID::A);
-				RTLIL::Const mask = sink_cell->getParam(ID(LUT));
-				int index = 0;
-				for (; index < GetSize(A); index++)
-					if (A[index] == a_bit)
-						break;
-				log_assert(index < GetSize(A));
-				int i = 0;
-				while (i < GetSize(mask)) {
-					for (int j = 0; j < (1 << index); j++)
-						std::swap(mask[i+j], mask[i+j+(1 << index)]);
-					i += 1 << (index+1);
-				}
-				A[index] = y_bit;
-				sink_cell->setPort(ID::A, A);
-				sink_cell->setParam(ID(LUT), mask);
-			}
-
-			// Since we have rewritten all sinks (which we know
-			// to be only LUTs) to be after the inverter, we can
-			// go ahead and clone the LUT with the expectation
-			// that the original driving LUT will become dangling
-			// and get cleaned away
-clone_lut:
-			driver_mask = driver_lut->getParam(ID(LUT));
-			for (auto &b : driver_mask.bits) {
-				if (b == RTLIL::State::S0) b = RTLIL::State::S1;
-				else if (b == RTLIL::State::S1) b = RTLIL::State::S0;
-			}
-			auto cell = module->addLut(NEW_ID,
-					driver_lut->getPort(ID::A),
-					y_bit,
-					driver_mask);
-			for (auto &bit : cell->connections_.at(ID::A)) {
-				bit.wire = module->wires_.at(remap_name(bit.wire->name));
-				bit2sinks[bit].push_back(cell);
-			}
-		}
-
-		// Now 'unexpose' those wires by undoing
-		// the expose operation -- remove them from PO/PI
-		// and re-connecting them back together
-		for (auto wire : module->wires()) {
-			auto it = wire->attributes.find(ID(abc9_scc_break));
-			if (it != wire->attributes.end()) {
-				wire->attributes.erase(it);
-				log_assert(wire->port_output);
-				wire->port_output = false;
-				std::string name = wire->name.str();
-				RTLIL::Wire *i_wire = module->wire(name.substr(0, GetSize(name) - 5));
-				log_assert(i_wire);
-				log_assert(i_wire->port_input);
-				i_wire->port_input = false;
-				module->connect(i_wire, wire);
-			}
-		}
-		module->fixup_ports();
-
-		//log("ABC RESULTS:        internal signals: %8d\n", int(signal_list.size()) - in_wires - out_wires);
-		log("ABC RESULTS:           input signals: %8d\n", in_wires);
-		log("ABC RESULTS:          output signals: %8d\n", out_wires);
-
-		design->remove(mapped_mod);
-	}
-	else
-	{
-		log("Don't call ABC as there is nothing to map.\n");
-	}
-
-	if (cleanup)
-	{
-		log("Removing temp directory.\n");
-		remove_directory(tempdir_name);
-	}
-
-	log_pop();
-}
-
-struct Abc9Pass : public Pass {
-	Abc9Pass() : Pass("abc9", "use ABC9 for technology mapping") { }
 	void help() YS_OVERRIDE
 	{
 		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
@@ -842,24 +61,25 @@ struct Abc9Pass : public Pass {
 		log("        if no -script parameter is given, the following scripts are used:\n");
 		log("\n");
 		log("        for -lut/-luts (only one LUT size):\n");
-		log("%s\n", fold_abc9_cmd(ABC_COMMAND_LUT /*"; lutpack {S}"*/).c_str());
+		// FIXME
+		//log("%s\n", fold_abc9_cmd(ABC_COMMAND_LUT /*"; lutpack {S}"*/).c_str());
 		log("\n");
 		log("        for -lut/-luts (different LUT sizes):\n");
-		log("%s\n", fold_abc9_cmd(ABC_COMMAND_LUT).c_str());
+		// FIXME
+		//log("%s\n", fold_abc9_cmd(ABC_COMMAND_LUT).c_str());
 		log("\n");
 		log("    -fast\n");
 		log("        use different default scripts that are slightly faster (at the cost\n");
 		log("        of output quality):\n");
 		log("\n");
 		log("        for -lut/-luts:\n");
-		log("%s\n", fold_abc9_cmd(ABC_FAST_COMMAND_LUT).c_str());
+		// FIXME
+		//log("%s\n", fold_abc9_cmd(ABC_FAST_COMMAND_LUT).c_str());
 		log("\n");
 		log("    -D <picoseconds>\n");
 		log("        set delay target. the string {D} in the default scripts above is\n");
 		log("        replaced by this option when used, and an empty string otherwise\n");
 		log("        (indicating best possible delay).\n");
-//		log("        This also replaces 'dretime' with 'dretime; retime -o {D}' in the\n");
-//		log("        default scripts above.\n");
 		log("\n");
 //		log("    -S <num>\n");
 //		log("        maximum number of LUT inputs shared.\n");
@@ -881,19 +101,10 @@ struct Abc9Pass : public Pass {
 		log("        generate netlist using luts. Use the specified costs for luts with 1,\n");
 		log("        2, 3, .. inputs.\n");
 		log("\n");
-//		log("    -dff\n");
-//		log("        also pass $_DFF_?_ and $_DFFE_??_ cells through ABC. modules with many\n");
-//		log("        clock domains are automatically partitioned in clock domains and each\n");
-//		log("        domain is passed through ABC independently.\n");
-//		log("\n");
-//		log("    -clk [!]<clock-signal-name>[,[!]<enable-signal-name>]\n");
-//		log("        use only the specified clock domain. this is like -dff, but only FF\n");
-//		log("        cells that belong to the specified clock domain are used.\n");
-//		log("\n");
-//		log("    -keepff\n");
-//		log("        set the \"keep\" attribute on flip-flop output wires. (and thus preserve\n");
-//		log("        them, for example for equivalence checking.)\n");
-//		log("\n");
+		log("    -dff\n");
+		log("        also pass $_ABC9_FF_ cells through to ABC. modules with many clock\n");
+		log("        domains are marked as such and automatically partitioned by ABC.\n");
+		log("\n");
 		log("    -nocleanup\n");
 		log("        when this option is used, the temporary files created by this pass\n");
 		log("        are not removed. this is useful for debugging.\n");
@@ -914,230 +125,85 @@ struct Abc9Pass : public Pass {
 		log("internally. This is not going to \"run ABC on your design\". It will instead run\n");
 		log("ABC on logic snippets extracted from your design. You will not get any useful\n");
 		log("output when passing an ABC script that writes a file. Instead write your full\n");
-		log("design as BLIF file with write_blif and then load that into ABC externally if\n");
-		log("you want to use ABC to convert your design into another format.\n");
+		log("design as an XAIGER file with `write_xaiger' and then load that into ABC\n");
+		log("externally if you want to use ABC to convert your design into another format.\n");
 		log("\n");
 		log("[1] http://www.eecs.berkeley.edu/~alanmi/abc/\n");
 		log("\n");
+		help_script();
+		log("\n");
 	}
-	void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
-	{
-		log_header(design, "Executing ABC9 pass (technology mapping using ABC9).\n");
-		log_push();
 
-		assign_map.clear();
+	std::stringstream map_cmd;
+	bool dff_mode, cleanup;
 
-#ifdef ABCEXTERNAL
-		std::string exe_file = ABCEXTERNAL;
-#else
-		std::string exe_file = proc_self_dirname() + "yosys-abc";
-#endif
-		std::string script_file, clk_str, box_file, lut_file;
-		std::string delay_target, lutin_shared = "-S 1", wire_delay;
-		bool fast_mode = false, dff_mode = false, keepff = false, cleanup = true;
-		bool show_tempdir = false;
-		bool nomfs = false;
-		vector<int> lut_costs;
-		markgroups = false;
-
-#if 0
-		cleanup = false;
-		show_tempdir = true;
-#endif
+	void clear_flags() YS_OVERRIDE
+	{
+		map_cmd.str("");
+		map_cmd << "abc9_map";
+		dff_mode = false;
+		cleanup = true;
+	}
 
-#ifdef _WIN32
-#ifndef ABCEXTERNAL
-		if (!check_file_exists(exe_file + ".exe") && check_file_exists(proc_self_dirname() + "..\\yosys-abc.exe"))
-			exe_file = proc_self_dirname() + "..\\yosys-abc";
-#endif
-#endif
+	void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
+	{
+		std::string run_from, run_to;
+		clear_flags();
 
 		size_t argidx;
-		char pwd [PATH_MAX];
-		if (!getcwd(pwd, sizeof(pwd))) {
-			log_cmd_error("getcwd failed: %s\n", strerror(errno));
-			log_abort();
-		}
 		for (argidx = 1; argidx < args.size(); argidx++) {
 			std::string arg = args[argidx];
-			if (arg == "-exe" && argidx+1 < args.size()) {
-				exe_file = args[++argidx];
-				continue;
-			}
-			if (arg == "-script" && argidx+1 < args.size()) {
-				script_file = args[++argidx];
-				rewrite_filename(script_file);
-				if (!script_file.empty() && !is_absolute_path(script_file) && script_file[0] != '+')
-					script_file = std::string(pwd) + "/" + script_file;
-				continue;
-			}
-			if (arg == "-D" && argidx+1 < args.size()) {
-				delay_target = "-D " + args[++argidx];
+			if ((arg == "-exe" || arg == "-script" || arg == "-D" ||
+						/* arg == "-S" || */ arg == "-lut" || arg == "-luts" ||
+						arg == "-box" || arg == "-W") &&
+					argidx+1 < args.size()) {
+				map_cmd << " " << arg << " " << args[++argidx];
 				continue;
 			}
-			//if (arg == "-S" && argidx+1 < args.size()) {
-			//	lutin_shared = "-S " + args[++argidx];
-			//	continue;
-			//}
-			if (arg == "-lut" && argidx+1 < args.size()) {
-				string arg = args[++argidx];
-				if (arg.find_first_not_of("0123456789:") == std::string::npos) {
-					size_t pos = arg.find_first_of(':');
-					int lut_mode = 0, lut_mode2 = 0;
-					if (pos != string::npos) {
-						lut_mode = atoi(arg.substr(0, pos).c_str());
-						lut_mode2 = atoi(arg.substr(pos+1).c_str());
-					} else {
-						lut_mode = atoi(arg.c_str());
-						lut_mode2 = lut_mode;
-					}
-					lut_costs.clear();
-					for (int i = 0; i < lut_mode; i++)
-						lut_costs.push_back(1);
-					for (int i = lut_mode; i < lut_mode2; i++)
-						lut_costs.push_back(2 << (i - lut_mode));
-				}
-				else {
-					lut_file = arg;
-					rewrite_filename(lut_file);
-					if (!lut_file.empty() && !is_absolute_path(lut_file) && lut_file[0] != '+')
-						lut_file = std::string(pwd) + "/" + lut_file;
-				}
+			if (arg == "-fast" || /* arg == "-dff" || */
+					/* arg == "-nocleanup" || */ arg == "-showtmp" || arg == "-markgroups" ||
+					arg == "-nomfs") {
+				map_cmd << " " << arg;
 				continue;
 			}
-			if (arg == "-luts" && argidx+1 < args.size()) {
-				lut_costs.clear();
-				for (auto &tok : split_tokens(args[++argidx], ",")) {
-					auto parts = split_tokens(tok, ":");
-					if (GetSize(parts) == 0 && !lut_costs.empty())
-						lut_costs.push_back(lut_costs.back());
-					else if (GetSize(parts) == 1)
-						lut_costs.push_back(atoi(parts.at(0).c_str()));
-					else if (GetSize(parts) == 2)
-						while (GetSize(lut_costs) < atoi(parts.at(0).c_str()))
-							lut_costs.push_back(atoi(parts.at(1).c_str()));
-					else
-						log_cmd_error("Invalid -luts syntax.\n");
-				}
+			if (arg == "-dff") {
+				dff_mode = true;
 				continue;
 			}
-			if (arg == "-fast") {
-				fast_mode = true;
-				continue;
-			}
-			//if (arg == "-dff") {
-			//	dff_mode = true;
-			//	continue;
-			//}
-			//if (arg == "-clk" && argidx+1 < args.size()) {
-			//	clk_str = args[++argidx];
-			//	dff_mode = true;
-			//	continue;
-			//}
-			//if (arg == "-keepff") {
-			//	keepff = true;
-			//	continue;
-			//}
 			if (arg == "-nocleanup") {
 				cleanup = false;
 				continue;
 			}
-			if (arg == "-showtmp") {
-				show_tempdir = true;
-				continue;
-			}
-			if (arg == "-markgroups") {
-				markgroups = true;
-				continue;
-			}
-			if (arg == "-box" && argidx+1 < args.size()) {
-				box_file = args[++argidx];
-				continue;
-			}
-			if (arg == "-W" && argidx+1 < args.size()) {
-				wire_delay = "-W " + args[++argidx];
-				continue;
-			}
-			if (arg == "-nomfs") {
-				nomfs = true;
-				continue;
-			}
 			break;
 		}
 		extra_args(args, argidx, design);
 
-		// ABC expects a box file for XAIG
-		if (box_file.empty())
-		    box_file = "+/dummy.box";
-
-		rewrite_filename(box_file);
-		if (!box_file.empty() && !is_absolute_path(box_file) && box_file[0] != '+')
-		    box_file = std::string(pwd) + "/" + box_file;
-
-		dict<int,IdString> box_lookup;
-		for (auto m : design->modules()) {
-			auto it = m->attributes.find(ID(abc9_box_id));
-			if (it == m->attributes.end())
-				continue;
-			if (m->name.begins_with("$paramod"))
-				continue;
-			auto id = it->second.as_int();
-			auto r = box_lookup.insert(std::make_pair(id, m->name));
-			if (!r.second)
-				log_error("Module '%s' has the same abc9_box_id = %d value as '%s'.\n",
-						log_id(m), id, log_id(r.first->second));
-			log_assert(r.second);
+		log_header(design, "Executing ABC9 pass.\n");
 
-			RTLIL::Wire *carry_in = nullptr, *carry_out = nullptr;
-			for (auto p : m->ports) {
-				auto w = m->wire(p);
-				log_assert(w);
-				if (w->attributes.count(ID(abc9_carry))) {
-					if (w->port_input) {
-						if (carry_in)
-							log_error("Module '%s' contains more than one 'abc9_carry' input port.\n", log_id(m));
-						carry_in = w;
-					}
-					else if (w->port_output) {
-						if (carry_out)
-							log_error("Module '%s' contains more than one 'abc9_carry' input port.\n", log_id(m));
-						carry_out = w;
-					}
-				}
-			}
-			if (carry_in || carry_out) {
-				if (carry_in && !carry_out)
-					log_error("Module '%s' contains an 'abc9_carry' input port but no output port.\n", log_id(m));
-				if (!carry_in && carry_out)
-					log_error("Module '%s' contains an 'abc9_carry' output port but no input port.\n", log_id(m));
-				// Make carry_in the last PI, and carry_out the last PO
-				//   since ABC requires it this way
-				auto &ports = m->ports;
-				for (auto it = ports.begin(); it != ports.end(); ) {
-					RTLIL::Wire* w = m->wire(*it);
-					log_assert(w);
-					if (w == carry_in || w == carry_out) {
-						it = ports.erase(it);
-						continue;
-					}
-					if (w->port_id > carry_in->port_id)
-						--w->port_id;
-					if (w->port_id > carry_out->port_id)
-						--w->port_id;
-					log_assert(w->port_input || w->port_output);
-					log_assert(ports[w->port_id-1] == w->name);
-					++it;
-				}
-				ports.push_back(carry_in->name);
-				carry_in->port_id = ports.size();
-				ports.push_back(carry_out->name);
-				carry_out->port_id = ports.size();
-			}
-		}
+		run_script(design, run_from, run_to);
+	}
 
-		for (auto mod : design->selected_modules())
-		{
-			if (mod->attributes.count(ID(abc9_box_id)))
+	void script() YS_OVERRIDE
+	{
+		run("scc -set_attr abc9_scc_id {}");
+		if (help_mode)
+			run("abc9_ops -break_scc -prep_holes [-dff]", "(option for -dff)");
+		else
+			run("abc9_ops -break_scc -prep_holes" + std::string(dff_mode ? " -dff" : ""), "(option for -dff)");
+		run("select -set abc9_holes A:abc9_holes");
+		run("flatten -wb @abc9_holes");
+		run("techmap @abc9_holes");
+		run("aigmap");
+		if (dff_mode)
+			run("abc9_ops -prep_dff");
+		run("opt -purge @abc9_holes");
+		run("wbflip @abc9_holes");
+
+		auto selected_modules = active_design->selected_modules();
+		active_design->selection_stack.emplace_back(false);
+
+		for (auto mod : selected_modules) {
+			if (mod->get_blackbox_attribute())
 				continue;
 
 			if (mod->processes.size() > 0) {
@@ -1145,165 +211,30 @@ struct Abc9Pass : public Pass {
 				continue;
 			}
 
-			assign_map.set(mod);
-
-			if (!dff_mode || !clk_str.empty()) {
-				abc9_module(design, mod, script_file, exe_file, cleanup, lut_costs, dff_mode, clk_str, keepff,
-						delay_target, lutin_shared, fast_mode, show_tempdir,
-						box_file, lut_file, wire_delay, box_lookup, nomfs);
-				continue;
-			}
-
-			CellTypes ct(design);
-
-			std::vector<RTLIL::Cell*> all_cells = mod->selected_cells();
-			std::set<RTLIL::Cell*> unassigned_cells(all_cells.begin(), all_cells.end());
+			active_design->selection().select(mod);
 
-			std::set<RTLIL::Cell*> expand_queue, next_expand_queue;
-			std::set<RTLIL::Cell*> expand_queue_up, next_expand_queue_up;
-			std::set<RTLIL::Cell*> expand_queue_down, next_expand_queue_down;
+			std::string tempdir_name = "/tmp/yosys-abc-XXXXXX";
+			if (!cleanup)
+				tempdir_name[0] = tempdir_name[4] = '_';
+			tempdir_name = make_temp_dir(tempdir_name);
 
-			typedef tuple<bool, RTLIL::SigSpec, bool, RTLIL::SigSpec> clkdomain_t;
-			std::map<clkdomain_t, std::vector<RTLIL::Cell*>> assigned_cells;
-			std::map<RTLIL::Cell*, clkdomain_t> assigned_cells_reverse;
+			run(stringf("write_xaiger -map %s/input.sym %s/input.xaig", tempdir_name.c_str(), tempdir_name.c_str()),
+					"write_xaiger -map <abc-temp-dir>/input.sym <abc-temp-dir>/input.xaig");
+			run(stringf("%s -tempdir %s", map_cmd.str().c_str(), tempdir_name.c_str()),
+					"abc9_map [options] -tempdir <abc-temp-dir>");
 
-			std::map<RTLIL::Cell*, std::set<RTLIL::SigBit>> cell_to_bit, cell_to_bit_up, cell_to_bit_down;
-			std::map<RTLIL::SigBit, std::set<RTLIL::Cell*>> bit_to_cell, bit_to_cell_up, bit_to_cell_down;
-
-			for (auto cell : all_cells)
+			if (cleanup)
 			{
-				clkdomain_t key;
-
-				for (auto &conn : cell->connections())
-				for (auto bit : conn.second) {
-					bit = assign_map(bit);
-					if (bit.wire != nullptr) {
-						cell_to_bit[cell].insert(bit);
-						bit_to_cell[bit].insert(cell);
-						if (ct.cell_input(cell->type, conn.first)) {
-							cell_to_bit_up[cell].insert(bit);
-							bit_to_cell_down[bit].insert(cell);
-						}
-						if (ct.cell_output(cell->type, conn.first)) {
-							cell_to_bit_down[cell].insert(bit);
-							bit_to_cell_up[bit].insert(cell);
-						}
-					}
-				}
-
-				if (cell->type.in(ID($_DFF_N_), ID($_DFF_P_)))
-				{
-					key = clkdomain_t(cell->type == ID($_DFF_P_), assign_map(cell->getPort(ID(C))), true, RTLIL::SigSpec());
-				}
-				else
-				if (cell->type.in(ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
-				{
-					bool this_clk_pol = cell->type.in(ID($_DFFE_PN_), ID($_DFFE_PP_));
-					bool this_en_pol = cell->type.in(ID($_DFFE_NP_), ID($_DFFE_PP_));
-					key = clkdomain_t(this_clk_pol, assign_map(cell->getPort(ID(C))), this_en_pol, assign_map(cell->getPort(ID(E))));
-				}
-				else
-					continue;
-
-				unassigned_cells.erase(cell);
-				expand_queue.insert(cell);
-				expand_queue_up.insert(cell);
-				expand_queue_down.insert(cell);
-
-				assigned_cells[key].push_back(cell);
-				assigned_cells_reverse[cell] = key;
+				log("Removing temp directory.\n");
+				remove_directory(tempdir_name);
 			}
 
-			while (!expand_queue_up.empty() || !expand_queue_down.empty())
-			{
-				if (!expand_queue_up.empty())
-				{
-					RTLIL::Cell *cell = *expand_queue_up.begin();
-					clkdomain_t key = assigned_cells_reverse.at(cell);
-					expand_queue_up.erase(cell);
-
-					for (auto bit : cell_to_bit_up[cell])
-					for (auto c : bit_to_cell_up[bit])
-						if (unassigned_cells.count(c)) {
-							unassigned_cells.erase(c);
-							next_expand_queue_up.insert(c);
-							assigned_cells[key].push_back(c);
-							assigned_cells_reverse[c] = key;
-							expand_queue.insert(c);
-						}
-				}
-
-				if (!expand_queue_down.empty())
-				{
-					RTLIL::Cell *cell = *expand_queue_down.begin();
-					clkdomain_t key = assigned_cells_reverse.at(cell);
-					expand_queue_down.erase(cell);
-
-					for (auto bit : cell_to_bit_down[cell])
-					for (auto c : bit_to_cell_down[bit])
-						if (unassigned_cells.count(c)) {
-							unassigned_cells.erase(c);
-							next_expand_queue_up.insert(c);
-							assigned_cells[key].push_back(c);
-							assigned_cells_reverse[c] = key;
-							expand_queue.insert(c);
-						}
-				}
-
-				if (expand_queue_up.empty() && expand_queue_down.empty()) {
-					expand_queue_up.swap(next_expand_queue_up);
-					expand_queue_down.swap(next_expand_queue_down);
-				}
-			}
-
-			while (!expand_queue.empty())
-			{
-				RTLIL::Cell *cell = *expand_queue.begin();
-				clkdomain_t key = assigned_cells_reverse.at(cell);
-				expand_queue.erase(cell);
-
-				for (auto bit : cell_to_bit.at(cell)) {
-					for (auto c : bit_to_cell[bit])
-						if (unassigned_cells.count(c)) {
-							unassigned_cells.erase(c);
-							next_expand_queue.insert(c);
-							assigned_cells[key].push_back(c);
-							assigned_cells_reverse[c] = key;
-						}
-					bit_to_cell[bit].clear();
-				}
-
-				if (expand_queue.empty())
-					expand_queue.swap(next_expand_queue);
-			}
-
-			clkdomain_t key(true, RTLIL::SigSpec(), true, RTLIL::SigSpec());
-			for (auto cell : unassigned_cells) {
-				assigned_cells[key].push_back(cell);
-				assigned_cells_reverse[cell] = key;
-			}
-
-			log_header(design, "Summary of detected clock domains:\n");
-			for (auto &it : assigned_cells)
-				log("  %d cells in clk=%s%s, en=%s%s\n", GetSize(it.second),
-						std::get<0>(it.first) ? "" : "!", log_signal(std::get<1>(it.first)),
-						std::get<2>(it.first) ? "" : "!", log_signal(std::get<3>(it.first)));
-
-			for (auto &it : assigned_cells) {
-				clk_polarity = std::get<0>(it.first);
-				clk_sig = assign_map(std::get<1>(it.first));
-				en_polarity = std::get<2>(it.first);
-				en_sig = assign_map(std::get<3>(it.first));
-				abc9_module(design, mod, script_file, exe_file, cleanup, lut_costs, !clk_sig.empty(), "$",
-						keepff, delay_target, lutin_shared, fast_mode, show_tempdir,
-						box_file, lut_file, wire_delay, box_lookup, nomfs);
-				assign_map.set(mod);
-			}
+			active_design->selection().selected_modules.clear();
 		}
 
-		assign_map.clear();
+		active_design->selection_stack.pop_back();
 
-		log_pop();
+		run("abc9_ops -unbreak_scc");
 	}
 } Abc9Pass;
 
diff --git a/passes/techmap/abc9_map.cc b/passes/techmap/abc9_map.cc
new file mode 100644
index 000000000..e061cadeb
--- /dev/null
+++ b/passes/techmap/abc9_map.cc
@@ -0,0 +1,881 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *                2019  Eddie Hung <eddie@fpgeh.com>
+ *
+ *  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.
+ *
+ */
+
+// [[CITE]] ABC
+// Berkeley Logic Synthesis and Verification Group, ABC: A System for Sequential Synthesis and Verification
+// http://www.eecs.berkeley.edu/~alanmi/abc/
+
+#if 0
+// Based on &flow3 - better QoR but more experimental
+#define ABC_COMMAND_LUT "&st; &ps -l; &sweep -v; &scorr; " \
+						"&st; &if {W}; &save; &st; &syn2; &if {W} -v; &save; &load; "\
+						"&st; &if -g -K 6; &dch -f; &if {W} -v; &save; &load; "\
+						"&st; &if -g -K 6; &synch2; &if {W} -v; &save; &load; "\
+						"&mfs; &ps -l"
+#else
+#define ABC_COMMAND_LUT "&st; &scorr; &sweep; &dc2; &st; &dch -f; &ps; &if {W} {D} -v; &mfs; &ps -l"
+#endif
+
+
+#define ABC_FAST_COMMAND_LUT "&st; &if {W} {D}"
+
+#include "kernel/register.h"
+#include "kernel/sigtools.h"
+#include "kernel/celltypes.h"
+#include "kernel/cost.h"
+#include "kernel/log.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <cerrno>
+#include <sstream>
+#include <climits>
+
+#ifndef _WIN32
+#  include <unistd.h>
+#  include <dirent.h>
+#endif
+
+#include "frontends/aiger/aigerparse.h"
+#include "kernel/utils.h"
+
+#ifdef YOSYS_LINK_ABC
+extern "C" int Abc_RealMain(int argc, char *argv[]);
+#endif
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+bool markgroups;
+int map_autoidx;
+
+inline std::string remap_name(RTLIL::IdString abc9_name)
+{
+	return stringf("$abc$%d$%s", map_autoidx, abc9_name.c_str()+1);
+}
+
+std::string add_echos_to_abc9_cmd(std::string str)
+{
+	std::string new_str, token;
+	for (size_t i = 0; i < str.size(); i++) {
+		token += str[i];
+		if (str[i] == ';') {
+			while (i+1 < str.size() && str[i+1] == ' ')
+				i++;
+			new_str += "echo + " + token + " " + token + " ";
+			token.clear();
+		}
+	}
+
+	if (!token.empty()) {
+		if (!new_str.empty())
+			new_str += "echo + " + token + "; ";
+		new_str += token;
+	}
+
+	return new_str;
+}
+
+std::string fold_abc9_cmd(std::string str)
+{
+	std::string token, new_str = "          ";
+	int char_counter = 10;
+
+	for (size_t i = 0; i <= str.size(); i++) {
+		if (i < str.size())
+			token += str[i];
+		if (i == str.size() || str[i] == ';') {
+			if (char_counter + token.size() > 75)
+				new_str += "\n              ", char_counter = 14;
+			new_str += token, char_counter += token.size();
+			token.clear();
+		}
+	}
+
+	return new_str;
+}
+
+std::string replace_tempdir(std::string text, std::string tempdir_name, bool show_tempdir)
+{
+	if (show_tempdir)
+		return text;
+
+	while (1) {
+		size_t pos = text.find(tempdir_name);
+		if (pos == std::string::npos)
+			break;
+		text = text.substr(0, pos) + "<abc-temp-dir>" + text.substr(pos + GetSize(tempdir_name));
+	}
+
+	std::string  selfdir_name = proc_self_dirname();
+	if (selfdir_name != "/") {
+		while (1) {
+			size_t pos = text.find(selfdir_name);
+			if (pos == std::string::npos)
+				break;
+			text = text.substr(0, pos) + "<yosys-exe-dir>/" + text.substr(pos + GetSize(selfdir_name));
+		}
+	}
+
+	return text;
+}
+
+struct abc9_output_filter
+{
+	bool got_cr;
+	int escape_seq_state;
+	std::string linebuf;
+	std::string tempdir_name;
+	bool show_tempdir;
+
+	abc9_output_filter(std::string tempdir_name, bool show_tempdir) : tempdir_name(tempdir_name), show_tempdir(show_tempdir)
+	{
+		got_cr = false;
+		escape_seq_state = 0;
+	}
+
+	void next_char(char ch)
+	{
+		if (escape_seq_state == 0 && ch == '\033') {
+			escape_seq_state = 1;
+			return;
+		}
+		if (escape_seq_state == 1) {
+			escape_seq_state = ch == '[' ? 2 : 0;
+			return;
+		}
+		if (escape_seq_state == 2) {
+			if ((ch < '0' || '9' < ch) && ch != ';')
+				escape_seq_state = 0;
+			return;
+		}
+		escape_seq_state = 0;
+		if (ch == '\r') {
+			got_cr = true;
+			return;
+		}
+		if (ch == '\n') {
+			log("ABC: %s\n", replace_tempdir(linebuf, tempdir_name, show_tempdir).c_str());
+			got_cr = false, linebuf.clear();
+			return;
+		}
+		if (got_cr)
+			got_cr = false, linebuf.clear();
+		linebuf += ch;
+	}
+
+	void next_line(const std::string &line)
+	{
+		//int pi, po;
+		//if (sscanf(line.c_str(), "Start-point = pi%d.  End-point = po%d.", &pi, &po) == 2) {
+		//	log("ABC: Start-point = pi%d (%s).  End-point = po%d (%s).\n",
+		//			pi, pi_map.count(pi) ? pi_map.at(pi).c_str() : "???",
+		//			po, po_map.count(po) ? po_map.at(po).c_str() : "???");
+		//	return;
+		//}
+
+		for (char ch : line)
+			next_char(ch);
+	}
+};
+
+void abc9_module(RTLIL::Design *design, RTLIL::Module *module, std::string script_file, std::string exe_file,
+		vector<int> lut_costs, std::string delay_target, std::string /*lutin_shared*/, bool fast_mode,
+		bool show_tempdir, std::string box_file, std::string lut_file,
+		std::string wire_delay, bool nomfs, std::string tempdir_name
+)
+{
+	map_autoidx = autoidx++;
+
+	//FIXME:
+	//log_header(design, "Extracting gate netlist of module `%s' to `%s/input.xaig'..\n",
+	//		module->name.c_str(), replace_tempdir(tempdir_name, tempdir_name, show_tempdir).c_str());
+
+	std::string abc9_script;
+
+	if (!lut_costs.empty()) {
+		abc9_script += stringf("read_lut %s/lutdefs.txt; ", tempdir_name.c_str());
+		if (!box_file.empty())
+			abc9_script += stringf("read_box %s; ", box_file.c_str());
+	}
+	else
+	if (!lut_file.empty()) {
+		abc9_script += stringf("read_lut %s; ", lut_file.c_str());
+		if (!box_file.empty())
+			abc9_script += stringf("read_box %s; ", box_file.c_str());
+	}
+	else
+		log_abort();
+
+	abc9_script += stringf("&read %s/input.xaig; &ps; ", tempdir_name.c_str());
+
+	if (!script_file.empty()) {
+		if (script_file[0] == '+') {
+			for (size_t i = 1; i < script_file.size(); i++)
+				if (script_file[i] == '\'')
+					abc9_script += "'\\''";
+				else if (script_file[i] == ',')
+					abc9_script += " ";
+				else
+					abc9_script += script_file[i];
+		} else
+			abc9_script += stringf("source %s", script_file.c_str());
+	} else if (!lut_costs.empty() || !lut_file.empty()) {
+		abc9_script += fast_mode ? ABC_FAST_COMMAND_LUT : ABC_COMMAND_LUT;
+	} else
+		log_abort();
+
+	for (size_t pos = abc9_script.find("{D}"); pos != std::string::npos; pos = abc9_script.find("{D}", pos))
+		abc9_script = abc9_script.substr(0, pos) + delay_target + abc9_script.substr(pos+3);
+
+	//for (size_t pos = abc9_script.find("{S}"); pos != std::string::npos; pos = abc9_script.find("{S}", pos))
+	//	abc9_script = abc9_script.substr(0, pos) + lutin_shared + abc9_script.substr(pos+3);
+
+	for (size_t pos = abc9_script.find("{W}"); pos != std::string::npos; pos = abc9_script.find("{W}", pos))
+		abc9_script = abc9_script.substr(0, pos) + wire_delay + abc9_script.substr(pos+3);
+
+	if (nomfs)
+		for (size_t pos = abc9_script.find("&mfs"); pos != std::string::npos; pos = abc9_script.find("&mfs", pos))
+			abc9_script = abc9_script.erase(pos, strlen("&mfs"));
+
+	abc9_script += stringf("; &write -n %s/output.aig", tempdir_name.c_str());
+	abc9_script = add_echos_to_abc9_cmd(abc9_script);
+
+	for (size_t i = 0; i+1 < abc9_script.size(); i++)
+		if (abc9_script[i] == ';' && abc9_script[i+1] == ' ')
+			abc9_script[i+1] = '\n';
+
+	FILE *f = fopen(stringf("%s/abc.script", tempdir_name.c_str()).c_str(), "wt");
+	fprintf(f, "%s\n", abc9_script.c_str());
+	fclose(f);
+
+	int count_outputs = design->scratchpad_get_int("write_xaiger.num_outputs");
+	log("Extracted %d AND gates and %d wires to a netlist network with %d inputs and %d outputs.\n",
+			design->scratchpad_get_int("write_xaiger.num_ands"),
+			design->scratchpad_get_int("write_xaiger.num_wires"),
+			design->scratchpad_get_int("write_xaiger.num_inputs"),
+			count_outputs);
+
+	if (count_outputs > 0) {
+		std::string buffer;
+		std::ifstream ifs;
+#if 0
+		buffer = stringf("%s/%s", tempdir_name.c_str(), "input.xaig");
+		ifs.open(buffer);
+		if (ifs.fail())
+			log_error("Can't open ABC output file `%s'.\n", buffer.c_str());
+		buffer = stringf("%s/%s", tempdir_name.c_str(), "input.sym");
+		log_assert(!design->module(ID($__abc9__)));
+		{
+			AigerReader reader(design, ifs, ID($__abc9__), "" /* clk_name */, buffer.c_str() /* map_filename */, true /* wideports */);
+			reader.parse_xaiger();
+		}
+		ifs.close();
+		Pass::call_on_module(design, design->module(ID($__abc9__)), stringf("write_verilog -noexpr -norename -selected"));
+		design->remove(design->module(ID($__abc9__)));
+#endif
+
+		log_header(design, "Executing ABC9.\n");
+
+		if (!lut_costs.empty()) {
+			buffer = stringf("%s/lutdefs.txt", tempdir_name.c_str());
+			f = fopen(buffer.c_str(), "wt");
+			if (f == NULL)
+				log_error("Opening %s for writing failed: %s\n", buffer.c_str(), strerror(errno));
+			for (int i = 0; i < GetSize(lut_costs); i++)
+				fprintf(f, "%d %d.00 1.00\n", i+1, lut_costs.at(i));
+			fclose(f);
+		}
+
+		buffer = stringf("%s -s -f %s/abc.script 2>&1", exe_file.c_str(), tempdir_name.c_str());
+		log("Running ABC command: %s\n", replace_tempdir(buffer, tempdir_name, show_tempdir).c_str());
+
+#ifndef YOSYS_LINK_ABC
+		abc9_output_filter filt(tempdir_name, show_tempdir);
+		int ret = run_command(buffer, std::bind(&abc9_output_filter::next_line, filt, std::placeholders::_1));
+#else
+		// These needs to be mutable, supposedly due to getopt
+		char *abc9_argv[5];
+		string tmp_script_name = stringf("%s/abc.script", tempdir_name.c_str());
+		abc9_argv[0] = strdup(exe_file.c_str());
+		abc9_argv[1] = strdup("-s");
+		abc9_argv[2] = strdup("-f");
+		abc9_argv[3] = strdup(tmp_script_name.c_str());
+		abc9_argv[4] = 0;
+		int ret = Abc_RealMain(4, abc9_argv);
+		free(abc9_argv[0]);
+		free(abc9_argv[1]);
+		free(abc9_argv[2]);
+		free(abc9_argv[3]);
+#endif
+		if (ret != 0)
+			log_error("ABC: execution of command \"%s\" failed: return code %d.\n", buffer.c_str(), ret);
+
+		buffer = stringf("%s/%s", tempdir_name.c_str(), "output.aig");
+		ifs.open(buffer, std::ifstream::binary);
+		if (ifs.fail())
+			log_error("Can't open ABC output file `%s'.\n", buffer.c_str());
+
+		buffer = stringf("%s/%s", tempdir_name.c_str(), "input.sym");
+		log_assert(!design->module(ID($__abc9__)));
+
+		AigerReader reader(design, ifs, ID($__abc9__), "" /* clk_name */, buffer.c_str() /* map_filename */, true /* wideports */);
+		reader.parse_xaiger();
+		ifs.close();
+
+#if 0
+		Pass::call_on_module(design, design->module(ID($__abc9__)), stringf("write_verilog -noexpr -norename -selected"));
+#endif
+
+		log_header(design, "Re-integrating ABC9 results.\n");
+		RTLIL::Module *mapped_mod = design->module(ID($__abc9__));
+		if (mapped_mod == NULL)
+			log_error("ABC output file does not contain a module `$__abc9__'.\n");
+
+		for (auto &it : mapped_mod->wires_) {
+			RTLIL::Wire *w = it.second;
+			RTLIL::Wire *remap_wire = module->addWire(remap_name(w->name), GetSize(w));
+			if (markgroups) remap_wire->attributes[ID(abcgroup)] = map_autoidx;
+		}
+
+		for (auto it = module->cells_.begin(); it != module->cells_.end(); )
+			if (it->second->type.in(ID($_AND_), ID($_NOT_), ID($__ABC9_FF_)))
+				it = module->cells_.erase(it);
+			else
+				++it;
+
+		dict<SigBit, pool<IdString>> bit_drivers, bit_users;
+		TopoSort<IdString, RTLIL::sort_by_id_str> toposort;
+		dict<RTLIL::Cell*,RTLIL::Cell*> not2drivers;
+		dict<SigBit, std::vector<RTLIL::Cell*>> bit2sinks;
+
+		std::map<IdString, int> cell_stats;
+		for (auto mapped_cell : mapped_mod->cells())
+		{
+			toposort.node(mapped_cell->name);
+
+			RTLIL::Cell *cell = nullptr;
+			if (mapped_cell->type == ID($_NOT_)) {
+				RTLIL::SigBit a_bit = mapped_cell->getPort(ID::A);
+				RTLIL::SigBit y_bit = mapped_cell->getPort(ID::Y);
+				bit_users[a_bit].insert(mapped_cell->name);
+				bit_drivers[y_bit].insert(mapped_cell->name);
+
+				if (!a_bit.wire) {
+					mapped_cell->setPort(ID::Y, module->addWire(NEW_ID));
+					RTLIL::Wire *wire = module->wire(remap_name(y_bit.wire->name));
+					log_assert(wire);
+					module->connect(RTLIL::SigBit(wire, y_bit.offset), State::S1);
+				}
+				else if (!lut_costs.empty() || !lut_file.empty()) {
+					RTLIL::Cell* driver_lut = nullptr;
+					// ABC can return NOT gates that drive POs
+					if (!a_bit.wire->port_input) {
+						// If it's not a NOT gate that that comes from a PI directly,
+						// find the driver LUT and clone that to guarantee that we won't
+						// increase the max logic depth
+						// (TODO: Optimise by not cloning unless will increase depth)
+						RTLIL::IdString driver_name;
+						if (GetSize(a_bit.wire) == 1)
+							driver_name = stringf("%s$lut", a_bit.wire->name.c_str());
+						else
+							driver_name = stringf("%s[%d]$lut", a_bit.wire->name.c_str(), a_bit.offset);
+						driver_lut = mapped_mod->cell(driver_name);
+					}
+
+					if (!driver_lut) {
+						// If a driver couldn't be found (could be from PI or box CI)
+						// then implement using a LUT
+						cell = module->addLut(remap_name(stringf("%s$lut", mapped_cell->name.c_str())),
+								RTLIL::SigBit(module->wires_.at(remap_name(a_bit.wire->name)), a_bit.offset),
+								RTLIL::SigBit(module->wires_.at(remap_name(y_bit.wire->name)), y_bit.offset),
+								RTLIL::Const::from_string("01"));
+						bit2sinks[cell->getPort(ID::A)].push_back(cell);
+						cell_stats[ID($lut)]++;
+					}
+					else
+						not2drivers[mapped_cell] = driver_lut;
+					continue;
+				}
+				else
+					log_abort();
+				if (cell && markgroups) cell->attributes[ID(abcgroup)] = map_autoidx;
+				continue;
+			}
+			cell_stats[mapped_cell->type]++;
+
+			RTLIL::Cell *existing_cell = nullptr;
+			if (mapped_cell->type.in(ID($lut), ID($__ABC9_FF_))) {
+				if (mapped_cell->type == ID($lut) &&
+						GetSize(mapped_cell->getPort(ID::A)) == 1 &&
+						mapped_cell->getParam(ID(LUT)) == RTLIL::Const::from_string("01")) {
+					SigSpec my_a = module->wires_.at(remap_name(mapped_cell->getPort(ID::A).as_wire()->name));
+					SigSpec my_y = module->wires_.at(remap_name(mapped_cell->getPort(ID::Y).as_wire()->name));
+					module->connect(my_y, my_a);
+					if (markgroups) mapped_cell->attributes[ID(abcgroup)] = map_autoidx;
+					log_abort();
+					continue;
+				}
+				cell = module->addCell(remap_name(mapped_cell->name), mapped_cell->type);
+			}
+			else {
+				existing_cell = module->cell(mapped_cell->name);
+				log_assert(existing_cell);
+				cell = module->addCell(remap_name(mapped_cell->name), mapped_cell->type);
+			}
+
+			if (markgroups) cell->attributes[ID(abcgroup)] = map_autoidx;
+			if (existing_cell) {
+				cell->parameters = existing_cell->parameters;
+				cell->attributes = existing_cell->attributes;
+				if (cell->attributes.erase("\\abc9_box_seq")) {
+					module->swap_names(cell, existing_cell);
+					module->remove(existing_cell);
+				}
+			}
+			else {
+				cell->parameters = mapped_cell->parameters;
+				cell->attributes = mapped_cell->attributes;
+			}
+
+			RTLIL::Module* box_module = design->module(mapped_cell->type);
+			auto abc9_flop = box_module && box_module->attributes.count("\\abc9_flop");
+			for (auto &conn : mapped_cell->connections()) {
+				RTLIL::SigSpec newsig;
+				for (auto c : conn.second.chunks()) {
+					if (c.width == 0)
+						continue;
+					//log_assert(c.width == 1);
+					if (c.wire)
+						c.wire = module->wires_.at(remap_name(c.wire->name));
+					newsig.append(c);
+				}
+				cell->setPort(conn.first, newsig);
+
+				if (!abc9_flop) {
+					if (cell->input(conn.first)) {
+						for (auto i : newsig)
+							bit2sinks[i].push_back(cell);
+						for (auto i : conn.second)
+							bit_users[i].insert(mapped_cell->name);
+					}
+					if (cell->output(conn.first))
+						for (auto i : conn.second)
+							bit_drivers[i].insert(mapped_cell->name);
+				}
+			}
+		}
+
+		// Copy connections (and rename) from mapped_mod to module
+		for (auto conn : mapped_mod->connections()) {
+			if (!conn.first.is_fully_const()) {
+				auto chunks = conn.first.chunks();
+				for (auto &c : chunks)
+					c.wire = module->wires_.at(remap_name(c.wire->name));
+				conn.first = std::move(chunks);
+			}
+			if (!conn.second.is_fully_const()) {
+				auto chunks = conn.second.chunks();
+				for (auto &c : chunks)
+					if (c.wire)
+						c.wire = module->wires_.at(remap_name(c.wire->name));
+				conn.second = std::move(chunks);
+			}
+			module->connect(conn);
+		}
+
+		for (auto &it : cell_stats)
+			log("ABC RESULTS:   %15s cells: %8d\n", it.first.c_str(), it.second);
+		int in_wires = 0, out_wires = 0;
+
+		// Stitch in mapped_mod's inputs/outputs into module
+		for (auto port : mapped_mod->ports) {
+			RTLIL::Wire *w = mapped_mod->wire(port);
+			RTLIL::Wire *wire = module->wire(port);
+			log_assert(wire);
+			RTLIL::Wire *remap_wire = module->wire(remap_name(port));
+			RTLIL::SigSpec signal = RTLIL::SigSpec(wire, 0, GetSize(remap_wire));
+			log_assert(GetSize(signal) >= GetSize(remap_wire));
+
+			RTLIL::SigSig conn;
+			if (w->port_output) {
+				conn.first = signal;
+				conn.second = remap_wire;
+				out_wires++;
+				module->connect(conn);
+			}
+			else if (w->port_input) {
+				conn.first = remap_wire;
+				conn.second = signal;
+				in_wires++;
+				module->connect(conn);
+			}
+		}
+
+		for (auto &it : bit_users)
+			if (bit_drivers.count(it.first))
+				for (auto driver_cell : bit_drivers.at(it.first))
+				for (auto user_cell : it.second)
+					toposort.edge(driver_cell, user_cell);
+		bool no_loops YS_ATTRIBUTE(unused) = toposort.sort();
+		log_assert(no_loops);
+
+		for (auto ii = toposort.sorted.rbegin(); ii != toposort.sorted.rend(); ii++) {
+			RTLIL::Cell *not_cell = mapped_mod->cell(*ii);
+			log_assert(not_cell);
+			if (not_cell->type != ID($_NOT_))
+				continue;
+			auto it = not2drivers.find(not_cell);
+			if (it == not2drivers.end())
+				continue;
+			RTLIL::Cell *driver_lut = it->second;
+			RTLIL::SigBit a_bit = not_cell->getPort(ID::A);
+			RTLIL::SigBit y_bit = not_cell->getPort(ID::Y);
+			RTLIL::Const driver_mask;
+
+			a_bit.wire = module->wires_.at(remap_name(a_bit.wire->name));
+			y_bit.wire = module->wires_.at(remap_name(y_bit.wire->name));
+
+			auto jt = bit2sinks.find(a_bit);
+			if (jt == bit2sinks.end())
+				goto clone_lut;
+
+			for (auto sink_cell : jt->second)
+				if (sink_cell->type != ID($lut))
+					goto clone_lut;
+
+			// Push downstream LUTs past inverter
+			for (auto sink_cell : jt->second) {
+				SigSpec A = sink_cell->getPort(ID::A);
+				RTLIL::Const mask = sink_cell->getParam(ID(LUT));
+				int index = 0;
+				for (; index < GetSize(A); index++)
+					if (A[index] == a_bit)
+						break;
+				log_assert(index < GetSize(A));
+				int i = 0;
+				while (i < GetSize(mask)) {
+					for (int j = 0; j < (1 << index); j++)
+						std::swap(mask[i+j], mask[i+j+(1 << index)]);
+					i += 1 << (index+1);
+				}
+				A[index] = y_bit;
+				sink_cell->setPort(ID::A, A);
+				sink_cell->setParam(ID(LUT), mask);
+			}
+
+			// Since we have rewritten all sinks (which we know
+			// to be only LUTs) to be after the inverter, we can
+			// go ahead and clone the LUT with the expectation
+			// that the original driving LUT will become dangling
+			// and get cleaned away
+clone_lut:
+			driver_mask = driver_lut->getParam(ID(LUT));
+			for (auto &b : driver_mask.bits) {
+				if (b == RTLIL::State::S0) b = RTLIL::State::S1;
+				else if (b == RTLIL::State::S1) b = RTLIL::State::S0;
+			}
+			auto cell = module->addLut(NEW_ID,
+					driver_lut->getPort(ID::A),
+					y_bit,
+					driver_mask);
+			for (auto &bit : cell->connections_.at(ID::A)) {
+				bit.wire = module->wires_.at(remap_name(bit.wire->name));
+				bit2sinks[bit].push_back(cell);
+			}
+		}
+
+		//log("ABC RESULTS:        internal signals: %8d\n", int(signal_list.size()) - in_wires - out_wires);
+		log("ABC RESULTS:           input signals: %8d\n", in_wires);
+		log("ABC RESULTS:          output signals: %8d\n", out_wires);
+
+		design->remove(mapped_mod);
+	}
+	//else
+	//{
+	//	log("Don't call ABC as there is nothing to map.\n");
+	//}
+}
+
+struct Abc9MapPass : public Pass {
+	Abc9MapPass() : Pass("abc9_map", "use ABC9 for technology mapping") { }
+	void help() YS_OVERRIDE
+	{
+		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+		log("\n");
+		log("    abc9_map [options] [selection]\n");
+		log("\n");
+		log("This pass uses the ABC tool [1] for technology mapping of yosys's internal gate\n");
+		log("library to a target architecture.\n");
+		log("\n");
+		log("    -exe <command>\n");
+#ifdef ABCEXTERNAL
+		log("        use the specified command instead of \"" ABCEXTERNAL "\" to execute ABC.\n");
+#else
+		log("        use the specified command instead of \"<yosys-bindir>/yosys-abc\" to execute ABC.\n");
+#endif
+		log("        This can e.g. be used to call a specific version of ABC or a wrapper.\n");
+		log("\n");
+		log("    -script <file>\n");
+		log("        use the specified ABC script file instead of the default script.\n");
+		log("\n");
+		log("        if <file> starts with a plus sign (+), then the rest of the filename\n");
+		log("        string is interpreted as the command string to be passed to ABC. The\n");
+		log("        leading plus sign is removed and all commas (,) in the string are\n");
+		log("        replaced with blanks before the string is passed to ABC.\n");
+		log("\n");
+		log("        if no -script parameter is given, the following scripts are used:\n");
+		log("\n");
+		log("        for -lut/-luts (only one LUT size):\n");
+		log("%s\n", fold_abc9_cmd(ABC_COMMAND_LUT /*"; lutpack {S}"*/).c_str());
+		log("\n");
+		log("        for -lut/-luts (different LUT sizes):\n");
+		log("%s\n", fold_abc9_cmd(ABC_COMMAND_LUT).c_str());
+		log("\n");
+		log("    -fast\n");
+		log("        use different default scripts that are slightly faster (at the cost\n");
+		log("        of output quality):\n");
+		log("\n");
+		log("        for -lut/-luts:\n");
+		log("%s\n", fold_abc9_cmd(ABC_FAST_COMMAND_LUT).c_str());
+		log("\n");
+		log("    -D <picoseconds>\n");
+		log("        set delay target. the string {D} in the default scripts above is\n");
+		log("        replaced by this option when used, and an empty string otherwise\n");
+		log("        (indicating best possible delay).\n");
+//		log("        This also replaces 'dretime' with 'dretime; retime -o {D}' in the\n");
+//		log("        default scripts above.\n");
+		log("\n");
+//		log("    -S <num>\n");
+//		log("        maximum number of LUT inputs shared.\n");
+//		log("        (replaces {S} in the default scripts above, default: -S 1)\n");
+//		log("\n");
+		log("    -lut <width>\n");
+		log("        generate netlist using luts of (max) the specified width.\n");
+		log("\n");
+		log("    -lut <w1>:<w2>\n");
+		log("        generate netlist using luts of (max) the specified width <w2>. All\n");
+		log("        luts with width <= <w1> have constant cost. for luts larger than <w1>\n");
+		log("        the area cost doubles with each additional input bit. the delay cost\n");
+		log("        is still constant for all lut widths.\n");
+		log("\n");
+		log("    -lut <file>\n");
+		log("        pass this file with lut library to ABC.\n");
+		log("\n");
+		log("    -luts <cost1>,<cost2>,<cost3>,<sizeN>:<cost4-N>,..\n");
+		log("        generate netlist using luts. Use the specified costs for luts with 1,\n");
+		log("        2, 3, .. inputs.\n");
+		log("\n");
+//		log("    -dff\n");
+//		log("        also pass $_DFF_?_ and $_DFFE_??_ cells through ABC. modules with many\n");
+//		log("        clock domains are automatically partitioned in clock domains and each\n");
+//		log("        domain is passed through ABC independently.\n");
+//		log("\n");
+//		log("    -clk [!]<clock-signal-name>[,[!]<enable-signal-name>]\n");
+//		log("        use only the specified clock domain. this is like -dff, but only FF\n");
+//		log("        cells that belong to the specified clock domain are used.\n");
+//		log("\n");
+//		log("    -keepff\n");
+//		log("        set the \"keep\" attribute on flip-flop output wires. (and thus preserve\n");
+//		log("        them, for example for equivalence checking.)\n");
+//		log("\n");
+		log("    -showtmp\n");
+		log("        print the temp dir name in log. usually this is suppressed so that the\n");
+		log("        command output is identical across runs.\n");
+		log("\n");
+		log("    -markgroups\n");
+		log("        set a 'abcgroup' attribute on all objects created by ABC. The value of\n");
+		log("        this attribute is a unique integer for each ABC process started. This\n");
+		log("        is useful for debugging the partitioning of clock domains.\n");
+		log("\n");
+		log("    -box <file>\n");
+		log("        pass this file with box library to ABC. Use with -lut.\n");
+		log("\n");
+		log("    -tempdir <dir>\n");
+		log("        use this as the temp dir.\n");
+		log("\n");
+		log("Note that this is a logic optimization pass within Yosys that is calling ABC\n");
+		log("internally. This is not going to \"run ABC on your design\". It will instead run\n");
+		log("ABC on logic snippets extracted from your design. You will not get any useful\n");
+		log("output when passing an ABC script that writes a file. Instead write your full\n");
+		log("design as BLIF file with write_blif and then load that into ABC externally if\n");
+		log("you want to use ABC to convert your design into another format.\n");
+		log("\n");
+		log("[1] http://www.eecs.berkeley.edu/~alanmi/abc/\n");
+		log("\n");
+	}
+	void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
+	{
+		log_header(design, "Executing ABC9_MAP pass (technology mapping using ABC9).\n");
+
+#ifdef ABCEXTERNAL
+		std::string exe_file = ABCEXTERNAL;
+#else
+		std::string exe_file = proc_self_dirname() + "yosys-abc";
+#endif
+		std::string script_file, clk_str, box_file, lut_file;
+		std::string delay_target, lutin_shared = "-S 1", wire_delay;
+		std::string tempdir_name;
+		bool fast_mode = false;
+		bool show_tempdir = false;
+		bool nomfs = false;
+		vector<int> lut_costs;
+		markgroups = false;
+
+#if 0
+		cleanup = false;
+		show_tempdir = true;
+#endif
+
+#ifdef _WIN32
+#ifndef ABCEXTERNAL
+		if (!check_file_exists(exe_file + ".exe") && check_file_exists(proc_self_dirname() + "..\\yosys-abc.exe"))
+			exe_file = proc_self_dirname() + "..\\yosys-abc";
+#endif
+#endif
+
+		size_t argidx;
+		char pwd [PATH_MAX];
+		if (!getcwd(pwd, sizeof(pwd))) {
+			log_cmd_error("getcwd failed: %s\n", strerror(errno));
+			log_abort();
+		}
+		for (argidx = 1; argidx < args.size(); argidx++) {
+			std::string arg = args[argidx];
+			if (arg == "-exe" && argidx+1 < args.size()) {
+				exe_file = args[++argidx];
+				continue;
+			}
+			if (arg == "-script" && argidx+1 < args.size()) {
+				script_file = args[++argidx];
+				rewrite_filename(script_file);
+				if (!script_file.empty() && !is_absolute_path(script_file) && script_file[0] != '+')
+					script_file = std::string(pwd) + "/" + script_file;
+				continue;
+			}
+			if (arg == "-D" && argidx+1 < args.size()) {
+				delay_target = "-D " + args[++argidx];
+				continue;
+			}
+			//if (arg == "-S" && argidx+1 < args.size()) {
+			//	lutin_shared = "-S " + args[++argidx];
+			//	continue;
+			//}
+			if (arg == "-lut" && argidx+1 < args.size()) {
+				string arg = args[++argidx];
+				if (arg.find_first_not_of("0123456789:") == std::string::npos) {
+					size_t pos = arg.find_first_of(':');
+					int lut_mode = 0, lut_mode2 = 0;
+					if (pos != string::npos) {
+						lut_mode = atoi(arg.substr(0, pos).c_str());
+						lut_mode2 = atoi(arg.substr(pos+1).c_str());
+					} else {
+						lut_mode = atoi(arg.c_str());
+						lut_mode2 = lut_mode;
+					}
+					lut_costs.clear();
+					for (int i = 0; i < lut_mode; i++)
+						lut_costs.push_back(1);
+					for (int i = lut_mode; i < lut_mode2; i++)
+						lut_costs.push_back(2 << (i - lut_mode));
+				}
+				else {
+					lut_file = arg;
+					rewrite_filename(lut_file);
+					if (!lut_file.empty() && !is_absolute_path(lut_file) && lut_file[0] != '+')
+						lut_file = std::string(pwd) + "/" + lut_file;
+				}
+				continue;
+			}
+			if (arg == "-luts" && argidx+1 < args.size()) {
+				lut_costs.clear();
+				for (auto &tok : split_tokens(args[++argidx], ",")) {
+					auto parts = split_tokens(tok, ":");
+					if (GetSize(parts) == 0 && !lut_costs.empty())
+						lut_costs.push_back(lut_costs.back());
+					else if (GetSize(parts) == 1)
+						lut_costs.push_back(atoi(parts.at(0).c_str()));
+					else if (GetSize(parts) == 2)
+						while (GetSize(lut_costs) < atoi(parts.at(0).c_str()))
+							lut_costs.push_back(atoi(parts.at(1).c_str()));
+					else
+						log_cmd_error("Invalid -luts syntax.\n");
+				}
+				continue;
+			}
+			if (arg == "-fast") {
+				fast_mode = true;
+				continue;
+			}
+			if (arg == "-showtmp") {
+				show_tempdir = true;
+				continue;
+			}
+			if (arg == "-markgroups") {
+				markgroups = true;
+				continue;
+			}
+			if (arg == "-box" && argidx+1 < args.size()) {
+				box_file = args[++argidx];
+				continue;
+			}
+			if (arg == "-W" && argidx+1 < args.size()) {
+				wire_delay = "-W " + args[++argidx];
+				continue;
+			}
+			if (arg == "-nomfs") {
+				nomfs = true;
+				continue;
+			}
+			if (arg == "-tempdir" && argidx+1 < args.size()) {
+				tempdir_name = args[++argidx];
+				continue;
+			}
+			break;
+		}
+		extra_args(args, argidx, design);
+
+		// ABC expects a box file for XAIG
+		if (box_file.empty())
+			box_file = "+/dummy.box";
+
+		rewrite_filename(box_file);
+		if (!box_file.empty() && !is_absolute_path(box_file) && box_file[0] != '+')
+			box_file = std::string(pwd) + "/" + box_file;
+
+		if (tempdir_name.empty())
+			log_cmd_error("abc9_map '-tempdir' option is mandatory.\n");
+
+
+		for (auto mod : design->selected_modules())
+		{
+			if (mod->processes.size() > 0) {
+				log("Skipping module %s as it contains processes.\n", log_id(mod));
+				continue;
+			}
+
+			abc9_module(design, mod, script_file, exe_file, lut_costs,
+					delay_target, lutin_shared, fast_mode, show_tempdir,
+					box_file, lut_file, wire_delay, nomfs, tempdir_name);
+		}
+	}
+} Abc9MapPass;
+
+PRIVATE_NAMESPACE_END
diff --git a/passes/techmap/abc9_ops.cc b/passes/techmap/abc9_ops.cc
new file mode 100644
index 000000000..730431ebf
--- /dev/null
+++ b/passes/techmap/abc9_ops.cc
@@ -0,0 +1,449 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *                2019  Eddie Hung <eddie@fpgeh.com>
+ *
+ *  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/register.h"
+#include "kernel/sigtools.h"
+#include "kernel/utils.h"
+#include "kernel/celltypes.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+void break_scc(RTLIL::Module *module)
+{
+	// For every unique SCC found, (arbitrarily) find the first
+	//   cell in the component, and convert all wires driven by
+	//   its output ports into a new PO, and drive its previous
+	//   sinks with a new PI
+	pool<RTLIL::Const> ids_seen;
+	for (auto cell : module->selected_cells()) {
+		auto it = cell->attributes.find(ID(abc9_scc_id));
+		if (it == cell->attributes.end())
+			continue;
+		auto r = ids_seen.insert(it->second);
+		cell->attributes.erase(it);
+		if (!r.second)
+			continue;
+		for (auto &c : cell->connections_) {
+			if (c.second.is_fully_const()) continue;
+			if (cell->output(c.first)) {
+				SigBit b = c.second.as_bit();
+				Wire *w = b.wire;
+				if (w->port_input) {
+					// In this case, hopefully the loop break has been already created
+					// Get the non-prefixed wire
+					Wire *wo = module->wire(stringf("%s.abco", b.wire->name.c_str()));
+					log_assert(wo != nullptr);
+					log_assert(wo->port_output);
+					log_assert(b.offset < GetSize(wo));
+					c.second = RTLIL::SigBit(wo, b.offset);
+				}
+				else {
+					// Create a new output/input loop break
+					w->port_input = true;
+					w = module->wire(stringf("%s.abco", w->name.c_str()));
+					if (!w) {
+						w = module->addWire(stringf("%s.abco", b.wire->name.c_str()), GetSize(b.wire));
+						w->port_output = true;
+					}
+					else {
+						log_assert(w->port_input);
+						log_assert(b.offset < GetSize(w));
+					}
+					w->set_bool_attribute(ID(abc9_scc_break));
+					c.second = RTLIL::SigBit(w, b.offset);
+				}
+			}
+		}
+	}
+
+	module->fixup_ports();
+}
+
+void unbreak_scc(RTLIL::Module *module)
+{
+	// Now 'unexpose' those wires by undoing
+	// the expose operation -- remove them from PO/PI
+	// and re-connecting them back together
+	for (auto wire : module->wires()) {
+		auto it = wire->attributes.find(ID(abc9_scc_break));
+		if (it != wire->attributes.end()) {
+			wire->attributes.erase(it);
+			log_assert(wire->port_output);
+			wire->port_output = false;
+			std::string name = wire->name.str();
+			RTLIL::Wire *i_wire = module->wire(name.substr(0, GetSize(name) - 5));
+			log_assert(i_wire);
+			log_assert(i_wire->port_input);
+			i_wire->port_input = false;
+			module->connect(i_wire, wire);
+		}
+	}
+	module->fixup_ports();
+}
+
+void prep_dff(RTLIL::Module *module)
+{
+	auto design = module->design;
+	log_assert(design);
+
+	SigMap assign_map(module);
+
+	typedef SigSpec clkdomain_t;
+	dict<clkdomain_t, int> clk_to_mergeability;
+
+	for (auto cell : module->selected_cells()) {
+		if (cell->type != "$__ABC9_FF_")
+			continue;
+
+		Wire *abc9_clock_wire = module->wire(stringf("%s.clock", cell->name.c_str()));
+		if (abc9_clock_wire == NULL)
+			log_error("'%s.clock' is not a wire present in module '%s'.\n", cell->name.c_str(), log_id(module));
+		SigSpec abc9_clock = assign_map(abc9_clock_wire);
+
+		clkdomain_t key(abc9_clock);
+
+		auto r = clk_to_mergeability.insert(std::make_pair(abc9_clock, clk_to_mergeability.size() + 1));
+		auto r2 YS_ATTRIBUTE(unused) = cell->attributes.insert(std::make_pair(ID(abc9_mergeability), r.first->second));
+		log_assert(r2.second);
+
+		Wire *abc9_init_wire = module->wire(stringf("%s.init", cell->name.c_str()));
+		if (abc9_init_wire == NULL)
+			log_error("'%s.init' is not a wire present in module '%s'.\n", cell->name.c_str(), log_id(module));
+		log_assert(GetSize(abc9_init_wire) == 1);
+		SigSpec abc9_init = assign_map(abc9_init_wire);
+		if (!abc9_init.is_fully_const())
+			log_error("'%s.init' is not a constant wire present in module '%s'.\n", cell->name.c_str(), log_id(module));
+		r2 = cell->attributes.insert(std::make_pair(ID(abc9_init), abc9_init.as_const()));
+		log_assert(r2.second);
+	}
+
+	RTLIL::Module *holes_module = design->module(stringf("%s$holes", module->name.c_str()));
+	if (holes_module) {
+		dict<SigSig, SigSig> replace;
+		for (auto it = holes_module->cells_.begin(); it != holes_module->cells_.end(); ) {
+			auto cell = it->second;
+			if (cell->type.in("$_DFF_N_", "$_DFF_NN0_", "$_DFF_NN1_", "$_DFF_NP0_", "$_DFF_NP1_",
+						"$_DFF_P_", "$_DFF_PN0_", "$_DFF_PN1", "$_DFF_PP0_", "$_DFF_PP1_")) {
+				SigBit D = cell->getPort("\\D");
+				SigBit Q = cell->getPort("\\Q");
+				// Remove the DFF cell from what needs to be a combinatorial box
+				it = holes_module->cells_.erase(it);
+				Wire *port;
+				if (GetSize(Q.wire) == 1)
+					port = holes_module->wire(stringf("$abc%s", Q.wire->name.c_str()));
+				else
+					port = holes_module->wire(stringf("$abc%s[%d]", Q.wire->name.c_str(), Q.offset));
+				log_assert(port);
+				// Prepare to replace "assign <port> = DFF.Q;" with "assign <port> = DFF.D;"
+				//   in order to extract the combinatorial control logic that feeds the box
+				//   (i.e. clock enable, synchronous reset, etc.)
+				replace.insert(std::make_pair(SigSig(port,Q), SigSig(port,D)));
+				// Since `flatten` above would have created wires named "<cell>.Q",
+				//   extract the pre-techmap cell name
+				auto pos = Q.wire->name.str().rfind(".");
+				log_assert(pos != std::string::npos);
+				IdString driver = Q.wire->name.substr(0, pos);
+				// And drive the signal that was previously driven by "DFF.Q" (typically
+				//   used to implement clock-enable functionality) with the "<cell>.$abc9_currQ"
+				//   wire (which itself is driven an input port) we inserted above
+				Wire *currQ = holes_module->wire(stringf("%s.abc9_ff.Q", driver.c_str()));
+				log_assert(currQ);
+				holes_module->connect(Q, currQ);
+			}
+			else
+				++it;
+		}
+
+		for (auto &conn : holes_module->connections_) {
+			auto it = replace.find(conn);
+			if (it != replace.end())
+				conn = it->second;
+		}
+	}
+}
+
+void prep_holes(RTLIL::Module *module, bool dff)
+{
+	auto design = module->design;
+	log_assert(design);
+
+	SigMap sigmap(module);
+
+	dict<SigBit, pool<IdString>> bit_drivers, bit_users;
+	TopoSort<IdString, RTLIL::sort_by_id_str> toposort;
+	bool abc9_box_seen = false;
+
+	for (auto cell : module->selected_cells()) {
+		if (cell->type == "$__ABC9_FF_")
+			continue;
+
+		auto inst_module = module->design->module(cell->type);
+		bool abc9_box = inst_module && inst_module->attributes.count("\\abc9_box_id");
+		bool abc9_flop = false;
+		if (abc9_box) {
+			abc9_flop = inst_module->get_bool_attribute("\\abc9_flop");
+			if (abc9_flop && !dff)
+				continue;
+			abc9_box_seen = abc9_box;
+		}
+		else if (!yosys_celltypes.cell_known(cell->type))
+			continue;
+
+		for (auto conn : cell->connections()) {
+			if (cell->input(conn.first))
+				for (auto bit : sigmap(conn.second))
+					bit_users[bit].insert(cell->name);
+
+			if (cell->output(conn.first) && !abc9_flop)
+				for (auto bit : sigmap(conn.second))
+					bit_drivers[bit].insert(cell->name);
+		}
+
+		toposort.node(cell->name);
+	}
+
+	if (!abc9_box_seen)
+		return;
+
+	for (auto &it : bit_users)
+		if (bit_drivers.count(it.first))
+			for (auto driver_cell : bit_drivers.at(it.first))
+			for (auto user_cell : it.second)
+				toposort.edge(driver_cell, user_cell);
+
+#if 0
+	toposort.analyze_loops = true;
+#endif
+	bool no_loops YS_ATTRIBUTE(unused) = toposort.sort();
+#if 0
+	unsigned i = 0;
+	for (auto &it : toposort.loops) {
+		log("  loop %d\n", i++);
+		for (auto cell_name : it) {
+			auto cell = module->cell(cell_name);
+			log_assert(cell);
+			log("\t%s (%s @ %s)\n", log_id(cell), log_id(cell->type), cell->get_src_attribute().c_str());
+		}
+	}
+#endif
+	log_assert(no_loops);
+
+	vector<Cell*> box_list;
+	for (auto cell_name : toposort.sorted) {
+		RTLIL::Cell *cell = module->cell(cell_name);
+		log_assert(cell);
+
+		RTLIL::Module* box_module = design->module(cell->type);
+		if (!box_module || !box_module->attributes.count("\\abc9_box_id"))
+			continue;
+		cell->attributes["\\abc9_box_seq"] = box_list.size();
+		box_list.emplace_back(cell);
+	}
+	log_assert(!box_list.empty());
+
+	RTLIL::Module *holes_module = design->addModule(stringf("%s$holes", module->name.c_str()));
+	log_assert(holes_module);
+	holes_module->set_bool_attribute("\\abc9_holes");
+
+	dict<IdString, Cell*> cell_cache;
+	dict<IdString, std::vector<IdString>> box_ports;
+
+	int port_id = 1;
+	for (auto cell : box_list) {
+		RTLIL::Module* orig_box_module = design->module(cell->type);
+		log_assert(orig_box_module);
+		IdString derived_name = orig_box_module->derive(design, cell->parameters);
+		RTLIL::Module* box_module = design->module(derived_name);
+		if (box_module->has_processes())
+			Pass::call_on_module(design, box_module, "proc");
+
+		int box_inputs = 0;
+		auto r = cell_cache.insert(std::make_pair(derived_name, nullptr));
+		Cell *holes_cell = r.first->second;
+		if (r.second && box_module->get_bool_attribute("\\whitebox")) {
+			holes_cell = holes_module->addCell(cell->name, cell->type);
+			holes_cell->parameters = cell->parameters;
+			r.first->second = holes_cell;
+		}
+
+		auto r2 = box_ports.insert(cell->type);
+		if (r2.second) {
+			// Make carry in the last PI, and carry out the last PO
+			//   since ABC requires it this way
+			IdString carry_in, carry_out;
+			for (const auto &port_name : box_module->ports) {
+				auto w = box_module->wire(port_name);
+				log_assert(w);
+				if (w->get_bool_attribute("\\abc9_carry")) {
+					if (w->port_input) {
+						if (carry_in != IdString())
+							log_error("Module '%s' contains more than one 'abc9_carry' input port.\n", log_id(box_module));
+						carry_in = port_name;
+					}
+					if (w->port_output) {
+						if (carry_out != IdString())
+							log_error("Module '%s' contains more than one 'abc9_carry' output port.\n", log_id(box_module));
+						carry_out = port_name;
+					}
+				}
+				else
+					r2.first->second.push_back(port_name);
+			}
+
+			if (carry_in != IdString() && carry_out == IdString())
+				log_error("Module '%s' contains an 'abc9_carry' input port but no output port.\n", log_id(box_module));
+			if (carry_in == IdString() && carry_out != IdString())
+				log_error("Module '%s' contains an 'abc9_carry' output port but no input port.\n", log_id(box_module));
+			if (carry_in != IdString()) {
+				r2.first->second.push_back(carry_in);
+				r2.first->second.push_back(carry_out);
+			}
+		}
+
+		for (const auto &port_name : box_ports.at(cell->type)) {
+			RTLIL::Wire *w = box_module->wire(port_name);
+			log_assert(w);
+			RTLIL::Wire *holes_wire;
+			RTLIL::SigSpec port_sig;
+			if (w->port_input)
+				for (int i = 0; i < GetSize(w); i++) {
+					box_inputs++;
+					holes_wire = holes_module->wire(stringf("\\i%d", box_inputs));
+					if (!holes_wire) {
+						holes_wire = holes_module->addWire(stringf("\\i%d", box_inputs));
+						holes_wire->port_input = true;
+						holes_wire->port_id = port_id++;
+						holes_module->ports.push_back(holes_wire->name);
+					}
+					if (holes_cell)
+						port_sig.append(holes_wire);
+				}
+			if (w->port_output)
+				for (int i = 0; i < GetSize(w); i++) {
+					if (GetSize(w) == 1)
+						holes_wire = holes_module->addWire(stringf("$abc%s.%s", cell->name.c_str(), log_id(w->name)));
+					else
+						holes_wire = holes_module->addWire(stringf("$abc%s.%s[%d]", cell->name.c_str(), log_id(w->name), i));
+					holes_wire->port_output = true;
+					holes_wire->port_id = port_id++;
+					holes_module->ports.push_back(holes_wire->name);
+					if (holes_cell)
+						port_sig.append(holes_wire);
+					else
+						holes_module->connect(holes_wire, State::S0);
+				}
+			if (!port_sig.empty()) {
+				if (r.second)
+					holes_cell->setPort(w->name, port_sig);
+				else
+					holes_module->connect(holes_cell->getPort(w->name), port_sig);
+			}
+		}
+
+		// For flops only, create an extra 1-bit input that drives a new wire
+		//   called "<cell>.$abc9_currQ" that is used below
+		if (box_module->get_bool_attribute("\\abc9_flop")) {
+			log_assert(holes_cell);
+
+			box_inputs++;
+			Wire *holes_wire = holes_module->wire(stringf("\\i%d", box_inputs));
+			if (!holes_wire) {
+				holes_wire = holes_module->addWire(stringf("\\i%d", box_inputs));
+				holes_wire->port_input = true;
+				holes_wire->port_id = port_id++;
+				holes_module->ports.push_back(holes_wire->name);
+			}
+			Wire *w = holes_module->addWire(stringf("%s.abc9_ff.Q", cell->name.c_str()));
+			holes_module->connect(w, holes_wire);
+		}
+	}
+}
+
+struct Abc9OpsPass : public Pass {
+	Abc9OpsPass() : Pass("abc9_ops", "helper functions for ABC9") { }
+	void help() YS_OVERRIDE
+	{
+		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+		log("\n");
+		log("    abc9_ops [options] [selection]\n");
+		log("\n");
+	}
+	void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
+	{
+		log_header(design, "Executing ABC9_OPS pass (helper functions for ABC9).\n");
+
+		bool break_scc_mode = false;
+		bool unbreak_scc_mode = false;
+		bool prep_dff_mode = false;
+		bool prep_holes_mode = false;
+		bool dff_mode = false;
+
+		size_t argidx;
+		for (argidx = 1; argidx < args.size(); argidx++) {
+			std::string arg = args[argidx];
+			if (arg == "-break_scc") {
+				break_scc_mode = true;
+				continue;
+			}
+			if (arg == "-unbreak_scc") {
+				unbreak_scc_mode = true;
+				continue;
+			}
+			if (arg == "-prep_dff") {
+				prep_dff_mode = true;
+				continue;
+			}
+			if (arg == "-prep_holes") {
+				prep_holes_mode = true;
+				continue;
+			}
+			if (arg == "-dff") {
+				dff_mode = true;
+				continue;
+			}
+			break;
+		}
+		extra_args(args, argidx, design);
+
+		for (auto mod : design->selected_modules()) {
+			if (mod->get_blackbox_attribute())
+				continue;
+			if (mod->get_bool_attribute("\\abc9_holes"))
+				continue;
+
+			if (mod->processes.size() > 0) {
+				log("Skipping module %s as it contains processes.\n", log_id(mod));
+				continue;
+			}
+
+			if (break_scc_mode)
+				break_scc(mod);
+			if (unbreak_scc_mode)
+				unbreak_scc(mod);
+			if (prep_dff_mode)
+				prep_dff(mod);
+			if (prep_holes_mode)
+				prep_holes(mod, dff_mode);
+		}
+	}
+} Abc9OpsPass;
+
+PRIVATE_NAMESPACE_END
diff --git a/passes/techmap/iopadmap.cc b/passes/techmap/iopadmap.cc
index 47da98b06..531ac2b99 100644
--- a/passes/techmap/iopadmap.cc
+++ b/passes/techmap/iopadmap.cc
@@ -234,6 +234,9 @@ struct IopadmapPass : public Pass {
 						SigBit wire_bit(wire, i);
 						Cell *tbuf_cell = nullptr;
 
+						if (skip_wire_bits.count(wire_bit))
+							continue;
+
 						if (tbuf_bits.count(wire_bit))
 							tbuf_cell = tbuf_bits.at(wire_bit);
 
diff --git a/techlibs/achronix/synth_achronix.cc b/techlibs/achronix/synth_achronix.cc
index 626860d9c..1dc6bdb2f 100755
--- a/techlibs/achronix/synth_achronix.cc
+++ b/techlibs/achronix/synth_achronix.cc
@@ -52,7 +52,7 @@ struct SynthAchronixPass : public ScriptPass {
     log("        do not flatten design before synthesis\n");
     log("\n");
     log("    -retime\n");
-    log("        run 'abc' with -dff option\n");
+    log("        run 'abc' with '-dff -D 1' options\n");
     log("\n");
     log("\n");
     log("The following commands are executed by this synthesis command:\n");
@@ -152,12 +152,12 @@ struct SynthAchronixPass : public ScriptPass {
         run("clean -purge");
         run("setundef -undriven -zero");
         if (retime || help_mode)
-          run("abc -markgroups -dff", "(only if -retime)");
+          run("abc -markgroups -dff -D 1", "(only if -retime)");
       }
 
     if (check_label("map_luts"))
       {
-        run("abc -lut 4" + string(retime ? " -dff" : ""));
+        run("abc -lut 4" + string(retime ? " -dff -D 1" : ""));
         run("clean");
       }
 
diff --git a/techlibs/anlogic/Makefile.inc b/techlibs/anlogic/Makefile.inc
index 9426b5ca5..2d8d65e2e 100644
--- a/techlibs/anlogic/Makefile.inc
+++ b/techlibs/anlogic/Makefile.inc
@@ -7,6 +7,6 @@ $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/cells_map.v))
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/arith_map.v))
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/cells_sim.v))
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/eagle_bb.v))
-$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/drams.txt))
-$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/drams_map.v))
-$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/dram_init_16x4.vh))
+$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/lutrams.txt))
+$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/lutrams_map.v))
+$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/lutram_init_16x4.vh))
diff --git a/techlibs/anlogic/cells_map.v b/techlibs/anlogic/cells_map.v
index cfc743a4b..8ac087d9d 100644
--- a/techlibs/anlogic/cells_map.v
+++ b/techlibs/anlogic/cells_map.v
@@ -6,14 +6,14 @@ module  \$_DFFE_NP_ (input D, C, E, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REG
 module  \$_DFFE_PN_ (input D, C, E, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'bx), .SRMUX("SR"), .SRMODE("SYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(C),  .ce(E), .sr(1'b0)); endmodule
 module  \$_DFFE_PP_ (input D, C, E, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'bx), .SRMUX("SR"), .SRMODE("SYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(C),  .ce(E), .sr(1'b0)); endmodule
 
-module  \$_DFF_NN0_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b0), .SRMUX("INV"), .SRMODE("SYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(~C), .ce(1'b1), .sr(R)); endmodule
-module  \$_DFF_NN1_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b1), .SRMUX("INV"), .SRMODE("SYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(~C), .ce(1'b1), .sr(R)); endmodule
-module  \$_DFF_NP0_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b0), .SRMUX("SR"),  .SRMODE("SYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(~C), .ce(1'b1), .sr(R)); endmodule
-module  \$_DFF_NP1_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b1), .SRMUX("SR"),  .SRMODE("SYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(~C), .ce(1'b1), .sr(R)); endmodule
-module  \$_DFF_PN0_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b0), .SRMUX("INV"), .SRMODE("SYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(C) , .ce(1'b1), .sr(R)); endmodule
-module  \$_DFF_PN1_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b1), .SRMUX("INV"), .SRMODE("SYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(C),  .ce(1'b1), .sr(R)); endmodule
-module  \$_DFF_PP0_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b0), .SRMUX("SR"),  .SRMODE("SYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(C),  .ce(1'b1), .sr(R)); endmodule
-module  \$_DFF_PP1_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b1), .SRMUX("SR"), . SRMODE("SYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(C),  .ce(1'b1), .sr(R)); endmodule
+module  \$_DFF_NN0_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b0), .SRMUX("INV"), .SRMODE("ASYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(~C), .ce(1'b1), .sr(R)); endmodule
+module  \$_DFF_NN1_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b1), .SRMUX("INV"), .SRMODE("ASYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(~C), .ce(1'b1), .sr(R)); endmodule
+module  \$_DFF_NP0_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b0), .SRMUX("SR"),  .SRMODE("ASYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(~C), .ce(1'b1), .sr(R)); endmodule
+module  \$_DFF_NP1_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b1), .SRMUX("SR"),  .SRMODE("ASYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(~C), .ce(1'b1), .sr(R)); endmodule
+module  \$_DFF_PN0_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b0), .SRMUX("INV"), .SRMODE("ASYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(C) , .ce(1'b1), .sr(R)); endmodule
+module  \$_DFF_PN1_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b1), .SRMUX("INV"), .SRMODE("ASYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(C),  .ce(1'b1), .sr(R)); endmodule
+module  \$_DFF_PP0_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b0), .SRMUX("SR"),  .SRMODE("ASYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(C),  .ce(1'b1), .sr(R)); endmodule
+module  \$_DFF_PP1_ (input D, C, R, output Q); AL_MAP_SEQ #(.DFFMODE("FF"), .REGSET(1'b1), .SRMUX("SR"), . SRMODE("ASYNC")) _TECHMAP_REPLACE_ (.d(D), .q(Q), .clk(C),  .ce(1'b1), .sr(R)); endmodule
 
 module \$_DLATCH_N_ (E, D, Q);
   wire [1023:0] _TECHMAP_DO_ = "simplemap; opt";
diff --git a/techlibs/anlogic/dram_init_16x4.vh b/techlibs/anlogic/lutram_init_16x4.vh
index 32fb1578c..32fb1578c 100644
--- a/techlibs/anlogic/dram_init_16x4.vh
+++ b/techlibs/anlogic/lutram_init_16x4.vh
diff --git a/techlibs/anlogic/drams.txt b/techlibs/anlogic/lutrams.txt
index 4e903c0a2..4e903c0a2 100644
--- a/techlibs/anlogic/drams.txt
+++ b/techlibs/anlogic/lutrams.txt
diff --git a/techlibs/anlogic/drams_map.v b/techlibs/anlogic/lutrams_map.v
index 084e2a25f..5a464cafc 100644
--- a/techlibs/anlogic/drams_map.v
+++ b/techlibs/anlogic/lutrams_map.v
@@ -10,7 +10,7 @@ module \$__ANLOGIC_DRAM16X4 (CLK1, A1ADDR, A1DATA, B1ADDR, B1DATA, B1EN);
 	input B1EN;
 
 	EG_LOGIC_DRAM16X4 #(
-		`include "dram_init_16x4.vh"
+		`include "lutram_init_16x4.vh"
 	) _TECHMAP_REPLACE_ (
 		.di(B1DATA),
 		.waddr(B1ADDR),
diff --git a/techlibs/anlogic/synth_anlogic.cc b/techlibs/anlogic/synth_anlogic.cc
index b87fc8566..aaa6bda4a 100644
--- a/techlibs/anlogic/synth_anlogic.cc
+++ b/techlibs/anlogic/synth_anlogic.cc
@@ -58,7 +58,10 @@ struct SynthAnlogicPass : public ScriptPass
 		log("        do not flatten design before synthesis\n");
 		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-dff -D 1' options\n");
+		log("\n");
+		log("    -nolutram\n");
+		log("        do not use EG_LOGIC_DRAM16X4 cells in output netlist\n");
 		log("\n");
 		log("\n");
 		log("The following commands are executed by this synthesis command:\n");
@@ -67,7 +70,7 @@ struct SynthAnlogicPass : public ScriptPass
 	}
 
 	string top_opt, edif_file, json_file;
-	bool flatten, retime;
+	bool flatten, retime, nolutram;
 
 	void clear_flags() YS_OVERRIDE
 	{
@@ -76,6 +79,7 @@ struct SynthAnlogicPass : public ScriptPass
 		json_file = "";
 		flatten = true;
 		retime = false;
+		nolutram = false;
 	}
 
 	void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@@ -110,6 +114,10 @@ struct SynthAnlogicPass : public ScriptPass
 				flatten = false;
 				continue;
 			}
+			if (args[argidx] == "-nolutram") {
+				nolutram = true;
+				continue;
+			}
 			if (args[argidx] == "-retime") {
 				retime = true;
 				continue;
@@ -150,21 +158,25 @@ struct SynthAnlogicPass : public ScriptPass
 			run("synth -run coarse");
 		}
 
-		if (check_label("dram"))
+		if (!nolutram && check_label("map_lutram", "(skip if -nolutram)"))
 		{
-			run("memory_bram -rules +/anlogic/drams.txt");
-			run("techmap -map +/anlogic/drams_map.v");
+			run("memory_bram -rules +/anlogic/lutrams.txt");
+			run("techmap -map +/anlogic/lutrams_map.v");
 			run("setundef -zero -params t:EG_LOGIC_DRAM16X4");
 		}
 
-		if (check_label("fine"))
+		if (check_label("map_ffram"))
 		{
 			run("opt -fast -mux_undef -undriven -fine");
 			run("memory_map");
 			run("opt -undriven -fine");
+		}
+
+		if (check_label("map_gates"))
+		{
 			run("techmap -map +/techmap.v -map +/anlogic/arith_map.v");
 			if (retime || help_mode)
-				run("abc -dff", "(only if -retime)");
+				run("abc -dff -D 1", "(only if -retime)");
 		}
 
 		if (check_label("map_ffs"))
@@ -187,7 +199,7 @@ struct SynthAnlogicPass : public ScriptPass
 			run("techmap -map +/anlogic/cells_map.v");
 			run("clean");
 		}
-		
+
 		if (check_label("map_anlogic"))
 		{
 			run("anlogic_fixcarry");
diff --git a/techlibs/coolrunner2/synth_coolrunner2.cc b/techlibs/coolrunner2/synth_coolrunner2.cc
index 014c68622..388e2b792 100644
--- a/techlibs/coolrunner2/synth_coolrunner2.cc
+++ b/techlibs/coolrunner2/synth_coolrunner2.cc
@@ -55,7 +55,7 @@ struct SynthCoolrunner2Pass : public ScriptPass
 		log("        do not flatten design before synthesis\n");
 		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-dff -D 1' options\n");
 		log("\n");
 		log("\n");
 		log("The following commands are executed by this synthesis command:\n");
@@ -161,7 +161,7 @@ struct SynthCoolrunner2Pass : public ScriptPass
 
 		if (check_label("map_pla"))
 		{
-			run("abc -sop -I 40 -P 56");
+			run("abc -sop -I 40 -P 56" + string(retime ? " -dff -D 1" : ""));
 			run("clean");
 		}
 
diff --git a/techlibs/easic/synth_easic.cc b/techlibs/easic/synth_easic.cc
index dd9e3dab7..b4a3a1ac9 100644
--- a/techlibs/easic/synth_easic.cc
+++ b/techlibs/easic/synth_easic.cc
@@ -56,7 +56,7 @@ struct SynthEasicPass : public ScriptPass
 		log("        do not flatten design before synthesis\n");
 		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-dff -D 1' options\n");
 		log("\n");
 		log("\n");
 		log("The following commands are executed by this synthesis command:\n");
@@ -158,7 +158,7 @@ struct SynthEasicPass : public ScriptPass
 			run("techmap");
 			run("opt -fast");
 			if (retime || help_mode) {
-				run("abc -dff", " (only if -retime)");
+				run("abc -dff -D 1", " (only if -retime)");
 				run("opt_clean", "(only if -retime)");
 			}
 		}
diff --git a/techlibs/ecp5/Makefile.inc b/techlibs/ecp5/Makefile.inc
index 46463f510..2c33f23b9 100644
--- a/techlibs/ecp5/Makefile.inc
+++ b/techlibs/ecp5/Makefile.inc
@@ -8,9 +8,9 @@ $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/cells_map.v))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/cells_sim.v))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/cells_bb.v))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/lutrams_map.v))
-$(eval $(call add_share_file,share/ecp5,techlibs/ecp5/lutram.txt))
+$(eval $(call add_share_file,share/ecp5,techlibs/ecp5/lutrams.txt))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/brams_map.v))
-$(eval $(call add_share_file,share/ecp5,techlibs/ecp5/bram.txt))
+$(eval $(call add_share_file,share/ecp5,techlibs/ecp5/brams.txt))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/arith_map.v))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/latches_map.v))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/dsp_map.v))
diff --git a/techlibs/ecp5/abc9_5g.box b/techlibs/ecp5/abc9_5g.box
index 2bc945a54..f153a665e 100644
--- a/techlibs/ecp5/abc9_5g.box
+++ b/techlibs/ecp5/abc9_5g.box
@@ -1,43 +1,36 @@
-# NB: Inputs/Outputs must be ordered alphabetically
-#     (with exceptions for carry in/out)
+# NB: Box inputs/outputs must each be in the same order
+#     as their corresponding module definition
+#     (with exceptions detailed below)
 
 # Box 1 : CCU2C (2xCARRY + 2xLUT4)
-# Outputs: S0, S1, COUT
-#   (NB: carry chain input/output must be last
-#        input/output and bus has been moved
-#        there overriding the otherwise
+#   (Exception: carry chain input/output must be the
+#        last input and output and the entire bus has been
+#        moved there overriding the otherwise
 #        alphabetical ordering)
 # name  ID   w/b   ins    outs
 CCU2C   1      1   9      3
-
-#A0   A1   B0   B1   C0    C1  D0   D1   CIN
-379  -    379  -    275   -    141  -    257
-630  379  630  379  526   275  392  141  273
-516  516  516  516  412   412  278  278  43
+#A0  B0   C0    D0   A1   B1   C1   D1   CIN
+379  379  275   141  -    -    -    -    257 # S0
+630  630  526   392  379  379  275  141  273 # S1
+516  516  412   278  516  516  412  278   43 # COUT
 
 # Box 2 : TRELLIS_DPR16X4_COMB (16x4 dist ram)
-# Outputs: DO0, DO1, DO2, DO3
 # name               ID  w/b   ins   outs
 $__ABC9_DPR16X4_COMB  2     0   8    4
-
-#A0   A1   A2   A3   RAD0   RAD1   RAD2   RAD3
-0     0    0    0    141    379    275    379
-0     0    0    0    141    379    275    379
-0     0    0    0    141    379    275    379
-0     0    0    0    141    379    275    379
+#$DO0 $DO1 $DO2 $DO3 RAD0   RAD1   RAD2   RAD3
+0     0    0    0    141    379    275    379 # DO0
+0     0    0    0    141    379    275    379 # DO1
+0     0    0    0    141    379    275    379 # DO2
+0     0    0    0    141    379    275    379 # DO3
 
 # Box 3 : PFUMX (MUX2)
-# Outputs: Z
 # name  ID   w/b   ins    outs
 PFUMX   3    1     3      1
-
 #ALUT  BLUT  C0
-98     98    151
+98     98    151 # Z
 
 # Box 4 : L6MUX21 (MUX2)
-# Outputs: Z
 # name   ID   w/b   ins    outs
 L6MUX21  4    1     3      1
-
 #D0    D1    SD
-140    141   148
+140    141   148 # Z
diff --git a/techlibs/ecp5/abc9_map.v b/techlibs/ecp5/abc9_map.v
index d8d70f9f6..113a35b91 100644
--- a/techlibs/ecp5/abc9_map.v
+++ b/techlibs/ecp5/abc9_map.v
@@ -1,24 +1,27 @@
 // ---------------------------------------
 
+// Attach a (combinatorial) black-box onto the output
+//   of this LUTRAM primitive to capture its
+//   asynchronous read behaviour
 module TRELLIS_DPR16X4 (
-	input  [3:0] DI,
-	input  [3:0] WAD,
-	input        WRE,
-	input        WCK,
-	input  [3:0] RAD,
+	(* techmap_autopurge *) input  [3:0] DI,
+	(* techmap_autopurge *) input  [3:0] WAD,
+	(* techmap_autopurge *) input        WRE,
+	(* techmap_autopurge *) input        WCK,
+	(* techmap_autopurge *) input  [3:0] RAD,
 	output [3:0] DO
 );
 	parameter WCKMUX = "WCK";
 	parameter WREMUX = "WRE";
 	parameter [63:0] INITVAL = 64'h0000000000000000;
-    wire [3:0] \$DO ;
+    wire [3:0] $DO;
 
     TRELLIS_DPR16X4 #(
       .WCKMUX(WCKMUX), .WREMUX(WREMUX), .INITVAL(INITVAL)
     ) _TECHMAP_REPLACE_ (
       .DI(DI), .WAD(WAD), .WRE(WRE), .WCK(WCK),
-      .RAD(RAD), .DO(\$DO )
+      .RAD(RAD), .DO($DO)
     );
 
-    \$__ABC9_DPR16X4_COMB do (.A(\$DO ), .S(RAD), .Y(DO));
+    $__ABC9_DPR16X4_COMB do (.$DO($DO), .RAD(RAD), .DO(DO));
 endmodule
diff --git a/techlibs/ecp5/abc9_model.v b/techlibs/ecp5/abc9_model.v
index 1dc8b5617..81e5cd070 100644
--- a/techlibs/ecp5/abc9_model.v
+++ b/techlibs/ecp5/abc9_model.v
@@ -1,5 +1,5 @@
 // ---------------------------------------
 
 (* abc9_box_id=2 *)
-module \$__ABC9_DPR16X4_COMB (input [3:0] A, S, output [3:0] Y);
+module \$__ABC9_DPR16X4_COMB (input [3:0] $DO, RAD, output [3:0] DO);
 endmodule
diff --git a/techlibs/ecp5/abc9_unmap.v b/techlibs/ecp5/abc9_unmap.v
index 9ae143c46..cbdffdaf1 100644
--- a/techlibs/ecp5/abc9_unmap.v
+++ b/techlibs/ecp5/abc9_unmap.v
@@ -1,5 +1,5 @@
 // ---------------------------------------
 
-module \$__ABC9_DPR16X4_COMB (input [3:0] A, S, output [3:0] Y);
-    assign Y = A;
+module \$__ABC9_DPR16X4_COMB (input [3:0] $DO, RAD, output [3:0] DO);
+    assign DO = $DO;
 endmodule
diff --git a/techlibs/ecp5/bram.txt b/techlibs/ecp5/brams.txt
index 777ccaa2e..777ccaa2e 100644
--- a/techlibs/ecp5/bram.txt
+++ b/techlibs/ecp5/brams.txt
diff --git a/techlibs/ecp5/cells_sim.v b/techlibs/ecp5/cells_sim.v
index f467218cc..0d3ec4e5b 100644
--- a/techlibs/ecp5/cells_sim.v
+++ b/techlibs/ecp5/cells_sim.v
@@ -1,5 +1,6 @@
 // ---------------------------------------
 
+(* lib_whitebox *)
 module LUT4(input A, B, C, D, output Z);
     parameter [15:0] INIT = 16'h0000;
     wire [7:0] s3 = D ?     INIT[15:8] :     INIT[7:0];
@@ -31,13 +32,8 @@ module CCU2C(
 
 	// First half
 	wire LUT4_0, LUT2_0;
-`ifdef _ABC
-	assign LUT4_0 = INIT0[{D0, C0, B0, A0}];
-	assign LUT2_0 = INIT0[{2'b00, B0, A0}];
-`else
 	LUT4 #(.INIT(INIT0)) lut4_0(.A(A0), .B(B0), .C(C0), .D(D0), .Z(LUT4_0));
 	LUT2 #(.INIT(INIT0[3:0])) lut2_0(.A(A0), .B(B0), .Z(LUT2_0));
-`endif
 	wire gated_cin_0 = (INJECT1_0 == "YES") ? 1'b0 : CIN;
 	assign S0 = LUT4_0 ^ gated_cin_0;
 
@@ -46,13 +42,8 @@ module CCU2C(
 
 	// Second half
 	wire LUT4_1, LUT2_1;
-`ifdef _ABC
-	assign LUT4_1 = INIT1[{D1, C1, B1, A1}];
-	assign LUT2_1 = INIT1[{2'b00, B1, A1}];
-`else
 	LUT4 #(.INIT(INIT1)) lut4_1(.A(A1), .B(B1), .C(C1), .D(D1), .Z(LUT4_1));
 	LUT2 #(.INIT(INIT1[3:0])) lut2_1(.A(A1), .B(B1), .Z(LUT2_1));
-`endif
 	wire gated_cin_1 = (INJECT1_1 == "YES") ? 1'b0 : cout_0;
 	assign S1 = LUT4_1 ^ gated_cin_1;
 
@@ -209,6 +200,7 @@ endmodule
 
 // ---------------------------------------
 
+(* lib_whitebox *)
 module LUT2(input A, B, output Z);
     parameter [3:0] INIT = 4'h0;
     wire [1:0] s1 = B ?     INIT[ 3:2] :     INIT[1:0];
diff --git a/techlibs/ecp5/lutram.txt b/techlibs/ecp5/lutrams.txt
index b94357429..b94357429 100644
--- a/techlibs/ecp5/lutram.txt
+++ b/techlibs/ecp5/lutrams.txt
diff --git a/techlibs/ecp5/synth_ecp5.cc b/techlibs/ecp5/synth_ecp5.cc
index b71bb2395..d616391b2 100644
--- a/techlibs/ecp5/synth_ecp5.cc
+++ b/techlibs/ecp5/synth_ecp5.cc
@@ -62,7 +62,7 @@ struct SynthEcp5Pass : public ScriptPass
 		log("        do not flatten design before synthesis\n");
 		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-dff -D 1' options\n");
 		log("\n");
 		log("    -noccu2\n");
 		log("        do not use CCU2 cells in output netlist\n");
@@ -230,7 +230,7 @@ struct SynthEcp5Pass : public ScriptPass
 	{
 		if (check_label("begin"))
 		{
-			run("read_verilog -D_ABC -lib +/ecp5/cells_sim.v +/ecp5/cells_bb.v");
+			run("read_verilog -lib +/ecp5/cells_sim.v +/ecp5/cells_bb.v");
 			run(stringf("hierarchy -check %s", help_mode ? "-top <top>" : top_opt.c_str()));
 		}
 
@@ -266,13 +266,13 @@ struct SynthEcp5Pass : public ScriptPass
 
 		if (!nobram && check_label("map_bram", "(skip if -nobram)"))
 		{
-			run("memory_bram -rules +/ecp5/bram.txt");
+			run("memory_bram -rules +/ecp5/brams.txt");
 			run("techmap -map +/ecp5/brams_map.v");
 		}
 
 		if (!nolutram && check_label("map_lutram", "(skip if -nolutram)"))
 		{
-			run("memory_bram -rules +/ecp5/lutram.txt");
+			run("memory_bram -rules +/ecp5/lutrams.txt");
 			run("techmap -map +/ecp5/lutrams_map.v");
 		}
 
@@ -290,7 +290,7 @@ struct SynthEcp5Pass : public ScriptPass
 			else
 				run("techmap -map +/techmap.v -map +/ecp5/arith_map.v");
 			if (retime || help_mode)
-				run("abc -dff", "(only if -retime)");
+				run("abc -dff -D 1", "(only if -retime)");
 		}
 
 		if (check_label("map_ffs"))
diff --git a/techlibs/efinix/Makefile.inc b/techlibs/efinix/Makefile.inc
index 5013f7fc1..69665982c 100644
--- a/techlibs/efinix/Makefile.inc
+++ b/techlibs/efinix/Makefile.inc
@@ -7,4 +7,4 @@ $(eval $(call add_share_file,share/efinix,techlibs/efinix/cells_map.v))
 $(eval $(call add_share_file,share/efinix,techlibs/efinix/arith_map.v))
 $(eval $(call add_share_file,share/efinix,techlibs/efinix/cells_sim.v))
 $(eval $(call add_share_file,share/efinix,techlibs/efinix/brams_map.v))
-$(eval $(call add_share_file,share/efinix,techlibs/efinix/bram.txt))
+$(eval $(call add_share_file,share/efinix,techlibs/efinix/brams.txt))
diff --git a/techlibs/efinix/bram.txt b/techlibs/efinix/brams.txt
index 0b3fd9308..0b3fd9308 100644
--- a/techlibs/efinix/bram.txt
+++ b/techlibs/efinix/brams.txt
diff --git a/techlibs/efinix/synth_efinix.cc b/techlibs/efinix/synth_efinix.cc
index 26a8d4eda..0efd91708 100644
--- a/techlibs/efinix/synth_efinix.cc
+++ b/techlibs/efinix/synth_efinix.cc
@@ -58,7 +58,10 @@ struct SynthEfinixPass : public ScriptPass
 		log("        do not flatten design before synthesis\n");
 		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-dff -D 1' options\n");
+		log("\n");
+		log("    -nobram\n");
+		log("        do not use EFX_RAM_5K cells in output netlist\n");
 		log("\n");
 		log("\n");
 		log("The following commands are executed by this synthesis command:\n");
@@ -67,7 +70,7 @@ struct SynthEfinixPass : public ScriptPass
 	}
 
 	string top_opt, edif_file, json_file;
-	bool flatten, retime;
+	bool flatten, retime, nobram;
 
 	void clear_flags() YS_OVERRIDE
 	{
@@ -76,6 +79,7 @@ struct SynthEfinixPass : public ScriptPass
 		json_file = "";
 		flatten = true;
 		retime = false;
+		nobram = false;
 	}
 
 	void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@@ -114,6 +118,10 @@ struct SynthEfinixPass : public ScriptPass
 				retime = true;
 				continue;
 			}
+			if (args[argidx] == "-nobram") {
+				nobram = true;
+				continue;
+			}
 			break;
 		}
 		extra_args(args, argidx, design);
@@ -150,21 +158,25 @@ struct SynthEfinixPass : public ScriptPass
 			run("synth -run coarse");
 		}
 
-		if (check_label("map_bram", "(skip if -nobram)"))
+		if (!nobram || check_label("map_bram", "(skip if -nobram)"))
 		{
-			run("memory_bram -rules +/efinix/bram.txt");
+			run("memory_bram -rules +/efinix/brams.txt");
 			run("techmap -map +/efinix/brams_map.v");
 			run("setundef -zero -params t:EFX_RAM_5K");
 		}
 
-		if (check_label("fine"))
+		if (check_label("map_ffram"))
 		{
 			run("opt -fast -mux_undef -undriven -fine");
 			run("memory_map");
 			run("opt -undriven -fine");
+		}
+
+		if (check_label("map_gates"))
+		{
 			run("techmap -map +/techmap.v -map +/efinix/arith_map.v");
 			if (retime || help_mode)
-				run("abc -dff", "(only if -retime)");
+				run("abc -dff -D 1", "(only if -retime)");
 		}
 
 		if (check_label("map_ffs"))
@@ -194,7 +206,7 @@ struct SynthEfinixPass : public ScriptPass
 			run("efinix_fixcarry");
 			run("clean");
 		}
-		
+
 		if (check_label("check"))
 		{
 			run("hierarchy -check");
diff --git a/techlibs/gowin/Makefile.inc b/techlibs/gowin/Makefile.inc
index d2853704b..fe5d9d6e6 100644
--- a/techlibs/gowin/Makefile.inc
+++ b/techlibs/gowin/Makefile.inc
@@ -7,9 +7,9 @@ $(eval $(call add_share_file,share/gowin,techlibs/gowin/cells_map.v))
 $(eval $(call add_share_file,share/gowin,techlibs/gowin/cells_sim.v))
 $(eval $(call add_share_file,share/gowin,techlibs/gowin/arith_map.v))
 $(eval $(call add_share_file,share/gowin,techlibs/gowin/brams_map.v))
-$(eval $(call add_share_file,share/gowin,techlibs/gowin/bram.txt))
-$(eval $(call add_share_file,share/gowin,techlibs/gowin/drams_map.v))
-$(eval $(call add_share_file,share/gowin,techlibs/gowin/dram.txt))
+$(eval $(call add_share_file,share/gowin,techlibs/gowin/brams.txt))
+$(eval $(call add_share_file,share/gowin,techlibs/gowin/lutrams_map.v))
+$(eval $(call add_share_file,share/gowin,techlibs/gowin/lutrams.txt))
 
 
 
diff --git a/techlibs/gowin/bram.txt b/techlibs/gowin/brams.txt
index e406f9c51..e406f9c51 100644
--- a/techlibs/gowin/bram.txt
+++ b/techlibs/gowin/brams.txt
diff --git a/techlibs/gowin/dram.txt b/techlibs/gowin/lutrams.txt
index 9db530251..9db530251 100644
--- a/techlibs/gowin/dram.txt
+++ b/techlibs/gowin/lutrams.txt
diff --git a/techlibs/gowin/drams_map.v b/techlibs/gowin/lutrams_map.v
index a50ab365a..a50ab365a 100644
--- a/techlibs/gowin/drams_map.v
+++ b/techlibs/gowin/lutrams_map.v
diff --git a/techlibs/gowin/synth_gowin.cc b/techlibs/gowin/synth_gowin.cc
index 6cf058f29..c5b41b503 100644
--- a/techlibs/gowin/synth_gowin.cc
+++ b/techlibs/gowin/synth_gowin.cc
@@ -55,23 +55,23 @@ struct SynthGowinPass : public ScriptPass
 		log("    -nobram\n");
 		log("        do not use BRAM cells in output netlist\n");
 		log("\n");
-		log("    -nodram\n");
+		log("    -nolutram\n");
 		log("        do not use distributed RAM cells in output netlist\n");
 		log("\n");
 		log("    -noflatten\n");
 		log("        do not flatten design before synthesis\n");
 		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-dff -D 1' options\n");
 		log("\n");
 		log("    -nowidelut\n");
 		log("        do not use muxes to implement LUTs larger than LUT4s\n");
 		log("\n");
 		log("    -noiopads\n");
 		log("        do not emit IOB at top level ports\n");
-		log("\n");
-		log("    -abc9\n");
-		log("        use new ABC9 flow (EXPERIMENTAL)\n");
+		//log("\n");
+		//log("    -abc9\n");
+		//log("        use new ABC9 flow (EXPERIMENTAL)\n");
 		log("\n");
 		log("\n");
 		log("The following commands are executed by this synthesis command:\n");
@@ -80,7 +80,7 @@ struct SynthGowinPass : public ScriptPass
 	}
 
 	string top_opt, vout_file;
-	bool retime, nobram, nodram, flatten, nodffe, nowidelut, abc9, noiopads;
+	bool retime, nobram, nolutram, flatten, nodffe, nowidelut, abc9, noiopads;
 
 	void clear_flags() YS_OVERRIDE
 	{
@@ -90,7 +90,7 @@ struct SynthGowinPass : public ScriptPass
 		flatten = true;
 		nobram = false;
 		nodffe = false;
-		nodram = false;
+		nolutram = false;
 		nowidelut = false;
 		abc9 = false;
 		noiopads = false;
@@ -128,8 +128,8 @@ struct SynthGowinPass : public ScriptPass
 				nobram = true;
 				continue;
 			}
-			if (args[argidx] == "-nodram") {
-				nodram = true;
+			if (args[argidx] == "-nolutram" || /*deprecated*/args[argidx] == "-nodram") {
+				nolutram = true;
 				continue;
 			}
 			if (args[argidx] == "-nodffe") {
@@ -144,10 +144,10 @@ struct SynthGowinPass : public ScriptPass
 				nowidelut = true;
 				continue;
 			}
-			if (args[argidx] == "-abc9") {
-				abc9 = true;
-				continue;
-			}
+			//if (args[argidx] == "-abc9") {
+			//	abc9 = true;
+			//	continue;
+			//}
 			if (args[argidx] == "-noiopads") {
 				noiopads = true;
 				continue;
@@ -188,28 +188,32 @@ struct SynthGowinPass : public ScriptPass
 			run("synth -run coarse");
 		}
 
-		if (!nobram && check_label("bram", "(skip if -nobram)"))
+		if (!nobram && check_label("map_bram", "(skip if -nobram)"))
 		{
-			run("memory_bram -rules +/gowin/bram.txt");
+			run("memory_bram -rules +/gowin/brams.txt");
 			run("techmap -map +/gowin/brams_map.v -map +/gowin/cells_sim.v");
 		}
 
-		if (!nodram && check_label("dram", "(skip if -nodram)"))
+		if (!nolutram && check_label("map_lutram", "(skip if -nolutram)"))
 		{
-			run("memory_bram -rules +/gowin/dram.txt");
-			run("techmap -map +/gowin/drams_map.v");
+			run("memory_bram -rules +/gowin/lutrams.txt");
+			run("techmap -map +/gowin/lutrams_map.v");
 			run("determine_init");
 		}
 
-		if (check_label("fine"))
+		if (check_label("map_ffram"))
 		{
 			run("opt -fast -mux_undef -undriven -fine");
 			run("memory_map");
 			run("opt -undriven -fine");
+		}
+
+		if (check_label("map_gates"))
+		{
 			run("techmap -map +/techmap.v -map +/gowin/arith_map.v");
 			run("techmap -map +/techmap.v");
 			if (retime || help_mode)
-				run("abc -dff", "(only if -retime)");
+				run("abc -dff -D 1", "(only if -retime)");
 			run("splitnets");
 		}
 
@@ -227,13 +231,13 @@ struct SynthGowinPass : public ScriptPass
 
 		if (check_label("map_luts"))
 		{
-			if (nowidelut && abc9) {
+			/*if (nowidelut && abc9) {
 				run("abc9 -lut 4");
-			} else if (nowidelut && !abc9) {
+			} else*/ if (nowidelut && !abc9) {
 				run("abc -lut 4");
-			} else if (!nowidelut && abc9) {
+			} else /*if (!nowidelut && abc9) {
 				run("abc9 -lut 4:8");
-			} else if (!nowidelut && !abc9) {
+			} else*/ if (!nowidelut && !abc9) {
 				run("abc -lut 4:8");
 			}
 			run("clean");
@@ -248,7 +252,6 @@ struct SynthGowinPass : public ScriptPass
 				run("iopadmap -bits -inpad IBUF O:I -outpad OBUF I:O "
 					"-toutpad TBUF OEN:I:O -tinoutpad IOBUF OEN:O:I:IO", "(unless -noiopads)");
 			run("clean");
-
 		}
 
 		if (check_label("check"))
diff --git a/techlibs/greenpak4/synth_greenpak4.cc b/techlibs/greenpak4/synth_greenpak4.cc
index eeb001b46..e1fbe6b69 100644
--- a/techlibs/greenpak4/synth_greenpak4.cc
+++ b/techlibs/greenpak4/synth_greenpak4.cc
@@ -59,7 +59,7 @@ struct SynthGreenPAK4Pass : public ScriptPass
 		log("        do not flatten design before synthesis\n");
 		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-dff -D 1' options\n");
 		log("\n");
 		log("\n");
 		log("The following commands are executed by this synthesis command:\n");
@@ -165,7 +165,7 @@ struct SynthGreenPAK4Pass : public ScriptPass
 			run("dfflibmap -prepare -liberty +/greenpak4/gp_dff.lib");
 			run("opt -fast");
 			if (retime || help_mode)
-				run("abc -dff", "(only if -retime)");
+				run("abc -dff -D 1", "(only if -retime)");
 		}
 
 		if (check_label("map_luts"))
diff --git a/techlibs/ice40/abc9_hx.box b/techlibs/ice40/abc9_hx.box
index 3ea70bc91..31e743669 100644
--- a/techlibs/ice40/abc9_hx.box
+++ b/techlibs/ice40/abc9_hx.box
@@ -1,13 +1,17 @@
 # From https://github.com/cliffordwolf/icestorm/blob/be0bca0/icefuzz/timings_hx8k.txt
 
-# NB: Inputs/Outputs must be ordered alphabetically
-#     (with exceptions for carry in/out)
+# NB: Box inputs/outputs must each be in the same order
+#     as their corresponding module definition
+#     (with exceptions detailed below)
 
-# Inputs: A B I0 I3 CI
-# Outputs: O CO
-#   (NB: carry chain input/output must be last
-#        input/output and have been moved there
-#        overriding the alphabetical ordering)
-$__ICE40_CARRY_WRAPPER 1 1 5 2
-400 379 449 316 316
-259 231 -   -   126
+# Box 1 : $__ICE40_CARRY_WRAPPER (private cell used to preserve
+#                                 SB_LUT4+SB_CARRY)
+#   (Exception: carry chain input/output must be the
+#        last input and output and the entire bus has been
+#        moved there overriding the otherwise
+#        alphabetical ordering)
+# name                 ID  w/b ins outs
+$__ICE40_CARRY_WRAPPER 1   1   5   2
+#A  B   I0  I3  CI
+400 379 449 316 316 # O
+259 231 -   -   126 # CO
diff --git a/techlibs/ice40/abc9_lp.box b/techlibs/ice40/abc9_lp.box
index 473e92fe9..71986a67b 100644
--- a/techlibs/ice40/abc9_lp.box
+++ b/techlibs/ice40/abc9_lp.box
@@ -1,13 +1,17 @@
 # From https://github.com/cliffordwolf/icestorm/blob/be0bca0/icefuzz/timings_lp8k.txt
 
-# NB: Inputs/Outputs must be ordered alphabetically
-#     (with exceptions for carry in/out)
+# NB: Box inputs/outputs must each be in the same order
+#     as their corresponding module definition
+#     (with exceptions detailed below)
 
-# Inputs: A B I0 I3 CI
-# Outputs: O CO
-#   (NB: carry chain input/output must be last
-#        input/output and have been moved there
-#        overriding the alphabetical ordering)
-$__ICE40_CARRY_WRAPPER 1 1 5 2
-589 558 661 465 465
-675 609 -   -   186
+# Box 1 : $__ICE40_CARRY_WRAPPER (private cell used to preserve
+#                                 SB_LUT4+SB_CARRY)
+#   (Exception: carry chain input/output must be the
+#        last input and output and the entire bus has been
+#        moved there overriding the otherwise
+#        alphabetical ordering)
+# name                 ID  w/b ins outs
+$__ICE40_CARRY_WRAPPER 1   1   5   2
+#A  B   I0  I3  CI
+589 558 661 465 465 # O
+675 609 -   -   186 # CO
diff --git a/techlibs/ice40/abc9_u.box b/techlibs/ice40/abc9_u.box
index f00e247b8..48a51463e 100644
--- a/techlibs/ice40/abc9_u.box
+++ b/techlibs/ice40/abc9_u.box
@@ -1,13 +1,18 @@
 # From https://github.com/cliffordwolf/icestorm/blob/be0bca0/icefuzz/timings_up5k.txt
 
-# NB: Inputs/Outputs must be ordered alphabetically
-#     (with exceptions for carry in/out)
+# NB: Box inputs/outputs must each be in the same order
+#     as their corresponding module definition
+#     (with exceptions detailed below)
 
-# Inputs: A B I0 I3 CI
-# Outputs: O CO
-#   (NB: carry chain input/output must be last
-#        input/output and have been moved there
-#        overriding the alphabetical ordering)
-$__ICE40_CARRY_WRAPPER 1 1 5 2
-1231 1205 1285 874 874
-675  609  -    -   278
+# Box 1 : $__ICE40_CARRY_WRAPPER (private cell used to preserve
+#                                 SB_LUT4+SB_CARRY)
+# Outputs: O, CO
+#   (Exception: carry chain input/output must be the
+#        last input and output and the entire bus has been
+#        moved there overriding the otherwise
+#        alphabetical ordering)
+# name                 ID  w/b ins outs
+$__ICE40_CARRY_WRAPPER 1   1   5   2
+#A  B   I0  I3  CI
+1231 1205 1285 874 874 # O
+675  609  -    -   278 # CO
diff --git a/techlibs/ice40/synth_ice40.cc b/techlibs/ice40/synth_ice40.cc
index ed7a16c08..463c2063a 100644
--- a/techlibs/ice40/synth_ice40.cc
+++ b/techlibs/ice40/synth_ice40.cc
@@ -65,7 +65,7 @@ struct SynthIce40Pass : public ScriptPass
 		log("        do not flatten design before synthesis\n");
 		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-dff -D 1' options\n");
 		log("\n");
 		log("    -nocarry\n");
 		log("        do not use SB_CARRY cells in output netlist\n");
@@ -316,7 +316,7 @@ struct SynthIce40Pass : public ScriptPass
 				run("techmap -map +/techmap.v -map +/ice40/arith_map.v");
 			}
 			if (retime || help_mode)
-				run(abc + " -dff", "(only if -retime)");
+				run(abc + " -dff -D 1", "(only if -retime)");
 			run("ice40_opt");
 		}
 
diff --git a/techlibs/intel/synth_intel.cc b/techlibs/intel/synth_intel.cc
index c8c690e45..2ebb8bf50 100644
--- a/techlibs/intel/synth_intel.cc
+++ b/techlibs/intel/synth_intel.cc
@@ -71,7 +71,7 @@ struct SynthIntelPass : public ScriptPass {
 		log("        do not flatten design before synthesis\n");
 		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-dff -D 1' options\n");
 		log("\n");
 		log("The following commands are executed by this synthesis command:\n");
 		help_script();
@@ -187,10 +187,10 @@ struct SynthIntelPass : public ScriptPass {
 		}
 
 		if (!nobram && check_label("map_bram", "(skip if -nobram)")) {
-                        if (family_opt == "cycloneiv" ||
-                            family_opt == "cycloneive" ||
-                            family_opt == "max10" ||
-                            help_mode) {
+				if (family_opt == "cycloneiv" ||
+				    family_opt == "cycloneive" ||
+				    family_opt == "max10" ||
+				    help_mode) {
 				run("memory_bram -rules +/intel/common/brams_m9k.txt", "(if applicable for family)");
 				run("techmap -map +/intel/common/brams_map_m9k.v", "(if applicable for family)");
 			} else {
@@ -210,7 +210,7 @@ struct SynthIntelPass : public ScriptPass {
 			run("clean -purge");
 			run("setundef -undriven -zero");
 			if (retime || help_mode)
-				run("abc -markgroups -dff", "(only if -retime)");
+				run("abc -markgroups -dff -D 1", "(only if -retime)");
 		}
 
 		if (check_label("map_luts")) {
@@ -224,7 +224,7 @@ struct SynthIntelPass : public ScriptPass {
 		if (check_label("map_cells")) {
 			if (iopads || help_mode)
 				run("iopadmap -bits -outpad $__outpad I:O -inpad $__inpad O:I", "(if -iopads)");
-                        run(stringf("techmap -map +/intel/%s/cells_map.v", family_opt.c_str()));
+			run(stringf("techmap -map +/intel/%s/cells_map.v", family_opt.c_str()));
 			run("dffinit -highlow -ff dffeas q power_up");
 			run("clean -purge");
 		}
diff --git a/techlibs/sf2/synth_sf2.cc b/techlibs/sf2/synth_sf2.cc
index 0924df7a6..543dfdb9e 100644
--- a/techlibs/sf2/synth_sf2.cc
+++ b/techlibs/sf2/synth_sf2.cc
@@ -67,7 +67,7 @@ struct SynthSf2Pass : public ScriptPass
 		log("        insert direct PAD->global_net buffers\n");
 		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-dff -D 1' options\n");
 		log("\n");
 		log("\n");
 		log("The following commands are executed by this synthesis command:\n");
@@ -181,7 +181,7 @@ struct SynthSf2Pass : public ScriptPass
 			run("opt -undriven -fine");
 			run("techmap -map +/techmap.v -map +/sf2/arith_map.v");
 			if (retime || help_mode)
-				run("abc -dff", "(only if -retime)");
+				run("abc -dff -D 1", "(only if -retime)");
 		}
 
 		if (check_label("map_ffs"))
diff --git a/techlibs/xilinx/abc9_map.v b/techlibs/xilinx/abc9_map.v
index 7b9427b2f..af58e217c 100644
--- a/techlibs/xilinx/abc9_map.v
+++ b/techlibs/xilinx/abc9_map.v
@@ -18,8 +18,366 @@
  *
  */
 
-// ============================================================================
+// The following techmapping rules are intended to be run (with -max_iter 1)
+//   before invoking the `abc9` pass in order to transform the design into
+//   a format that it understands.
 
+`ifdef DFF_MODE
+// For example, (complex) flip-flops are expected to be described as an
+//   combinatorial box (containing all control logic such as clock enable
+//   or synchronous resets) followed by a basic D-Q flop.
+// Yosys will automatically analyse the simulation model (described in
+//   cells_sim.v) and detach any $_DFF_P_ or $_DFF_N_ cells present in
+//   order to extract the combinatorial control logic left behind.
+//   Specifically, a simulation model similar to the one below:
+//
+//                ++===================================++
+//                ||                        Sim model  ||
+//                ||      /\/\/\/\                     ||
+//            D -->>-----<        >     +------+       ||
+//            R -->>-----<  Comb. >     |$_DFF_|       ||
+//           CE -->>-----<  logic >-----| [NP]_|---+---->>-- Q
+//                ||  +--<        >     +------+   |   ||
+//                ||  |   \/\/\/\/                 |   ||
+//                ||  |                            |   ||
+//                ||  +----------------------------+   ||
+//                ||                                   ||
+//                ++===================================++
+//
+//   is transformed into:
+//
+//                ++==================++
+//                ||         Comb box ||
+//                ||                  ||
+//                ||      /\/\/\/\    ||
+//           D  -->>-----<        >   ||
+//           R  -->>-----<  Comb. >   ||        +-----------+
+//          CE  -->>-----<  logic >--->>-- $Q --|$__ABC9_FF_|--+-->> Q
+//   abc9_ff.Q +-->>-----<        >   ||        +-----------+  |
+//             |  ||      \/\/\/\/    ||                       |
+//             |  ||                  ||                       |
+//             |  ++==================++                       |
+//             |                                               |
+//             +-----------------------------------------------+
+//
+// The purpose of the following FD* rules are to wrap the flop with:
+// (a) a special $__ABC9_FF_ in front of the FD*'s output, indicating to abc9
+//     the connectivity of its basic D-Q flop
+// (b) an optional $__ABC9_ASYNC_ cell in front of $__ABC_FF_'s output to
+//     capture asynchronous behaviour
+// (c) a special abc9_ff.clock wire to capture its clock domain and polarity
+//     (indicated to `abc9' so that it only performs sequential synthesis
+//     (with reachability analysis) correctly on one domain at a time)
+// (d) a special abc9_ff.init wire to encode the flop's initial state
+//     NOTE: in order to perform sequential synthesis, `abc9' also requires
+//     that the initial value of all flops be zero
+// (e) a special _TECHMAP_REPLACE_.abc9_ff.Q wire that will be used for feedback
+//     into the (combinatorial) FD* cell to facilitate clock-enable behaviour
+
+module FDRE (output Q, input C, CE, D, R);
+  parameter [0:0] INIT = 1'b0;
+  parameter [0:0] IS_C_INVERTED = 1'b0;
+  parameter [0:0] IS_D_INVERTED = 1'b0;
+  parameter [0:0] IS_R_INVERTED = 1'b0;
+  wire QQ, $Q;
+  generate if (INIT == 1'b1) begin
+    assign Q = ~QQ;
+    FDSE #(
+      .INIT(1'b0),
+      .IS_C_INVERTED(IS_C_INVERTED),
+      .IS_D_INVERTED(IS_D_INVERTED),
+      .IS_S_INVERTED(IS_R_INVERTED)
+    ) _TECHMAP_REPLACE_ (
+      .D(~D), .Q($Q), .C(C), .CE(CE), .S(R)
+    );
+  end
+  else begin
+    assign Q = QQ;
+    FDRE #(
+      .INIT(1'b0),
+      .IS_C_INVERTED(IS_C_INVERTED),
+      .IS_D_INVERTED(IS_D_INVERTED),
+      .IS_R_INVERTED(IS_R_INVERTED)
+    ) _TECHMAP_REPLACE_ (
+      .D(D), .Q($Q), .C(C), .CE(CE), .R(R)
+    );
+  end
+  endgenerate
+  $__ABC9_FF_ abc9_ff (.D($Q), .Q(QQ));
+
+  // Special signals
+  wire [1:0] abc9_ff.clock = {C, IS_C_INVERTED};
+  wire [0:0] abc9_ff.init = 1'b0;
+  wire [0:0] _TECHMAP_REPLACE_.abc9_ff.Q = QQ;
+endmodule
+module FDRE_1 (output Q, input C, CE, D, R);
+  parameter [0:0] INIT = 1'b0;
+  wire QQ, $Q;
+  generate if (INIT == 1'b1) begin
+    assign Q = ~QQ;
+    FDSE_1 #(
+      .INIT(1'b0)
+    ) _TECHMAP_REPLACE_ (
+      .D(~D), .Q($Q), .C(C), .CE(CE), .S(R)
+    );
+  end
+  else begin
+    assign Q = QQ;
+    FDRE_1 #(
+      .INIT(1'b0)
+    ) _TECHMAP_REPLACE_ (
+      .D(D), .Q($Q), .C(C), .CE(CE), .R(R)
+    );
+  end
+  endgenerate
+  $__ABC9_FF_ abc9_ff (.D($Q), .Q(QQ));
+
+  // Special signals
+  wire [1:0] abc9_ff.clock = {C, 1'b1 /* IS_C_INVERTED */};
+  wire [0:0] abc9_ff.init = 1'b0;
+  wire [0:0] _TECHMAP_REPLACE_.abc9_ff.Q = QQ;
+endmodule
+
+module FDSE (output Q, input C, CE, D, S);
+  parameter [0:0] INIT = 1'b1;
+  parameter [0:0] IS_C_INVERTED = 1'b0;
+  parameter [0:0] IS_D_INVERTED = 1'b0;
+  parameter [0:0] IS_S_INVERTED = 1'b0;
+  wire QQ, $Q;
+  generate if (INIT == 1'b1) begin
+    assign Q = ~QQ;
+    FDRE #(
+      .INIT(1'b0),
+      .IS_C_INVERTED(IS_C_INVERTED),
+      .IS_D_INVERTED(IS_D_INVERTED),
+      .IS_R_INVERTED(IS_S_INVERTED)
+    ) _TECHMAP_REPLACE_ (
+      .D(~D), .Q($Q), .C(C), .CE(CE), .R(S)
+    );
+  end
+  else begin
+    assign Q = QQ;
+    FDSE #(
+      .INIT(1'b0),
+      .IS_C_INVERTED(IS_C_INVERTED),
+      .IS_D_INVERTED(IS_D_INVERTED),
+      .IS_S_INVERTED(IS_S_INVERTED)
+    ) _TECHMAP_REPLACE_ (
+      .D(D), .Q($Q), .C(C), .CE(CE), .S(S)
+    );
+  end endgenerate
+  $__ABC9_FF_ abc9_ff (.D($Q), .Q(QQ));
+
+  // Special signals
+  wire [1:0] abc9_ff.clock = {C, IS_C_INVERTED};
+  wire [0:0] abc9_ff.init = 1'b0;
+  wire [0:0] _TECHMAP_REPLACE_.abc9_ff.Q = QQ;
+endmodule
+module FDSE_1 (output Q, input C, CE, D, S);
+  parameter [0:0] INIT = 1'b1;
+  wire QQ, $Q;
+  generate if (INIT == 1'b1) begin
+    assign Q = ~QQ;
+    FDRE_1 #(
+      .INIT(1'b0)
+    ) _TECHMAP_REPLACE_ (
+      .D(~D), .Q($Q), .C(C), .CE(CE), .R(S)
+    );
+  end
+  else begin
+    assign Q = QQ;
+    FDSE_1 #(
+      .INIT(1'b0)
+    ) _TECHMAP_REPLACE_ (
+      .D(D), .Q($Q), .C(C), .CE(CE), .S(S)
+    );
+  end endgenerate
+  $__ABC9_FF_ abc9_ff (.D($Q), .Q(QQ));
+
+  // Special signals
+  wire [1:0] abc9_ff.clock = {C, 1'b1 /* IS_C_INVERTED */};
+  wire [0:0] abc9_ff.init = 1'b0;
+  wire [0:0] _TECHMAP_REPLACE_.abc9_ff.Q = QQ;
+endmodule
+
+module FDCE (output Q, input C, CE, D, CLR);
+  parameter [0:0] INIT = 1'b0;
+  parameter [0:0] IS_C_INVERTED = 1'b0;
+  parameter [0:0] IS_D_INVERTED = 1'b0;
+  parameter [0:0] IS_CLR_INVERTED = 1'b0;
+  wire QQ, $Q, $QQ;
+  generate if (INIT == 1'b1) begin
+    assign Q = ~QQ;
+    FDPE #(
+      .INIT(1'b0),
+      .IS_C_INVERTED(IS_C_INVERTED),
+      .IS_D_INVERTED(IS_D_INVERTED),
+      .IS_PRE_INVERTED(IS_CLR_INVERTED)
+    ) _TECHMAP_REPLACE_ (
+      .D(~D), .Q($Q), .C(C), .CE(CE), .PRE(CLR)
+                                            // ^^^ Note that async
+                                            //     control is not directly
+                                            //     supported by abc9 but its
+                                            //     behaviour is captured by
+                                            //     $__ABC9_ASYNC1 below
+    );
+    // Since this is an async flop, async behaviour is dealt with here
+    $__ABC9_ASYNC1 abc_async (.A($QQ), .S(CLR ^ IS_CLR_INVERTED), .Y(QQ));
+  end
+  else begin
+    assign Q = QQ;
+    FDCE #(
+      .INIT(1'b0),
+      .IS_C_INVERTED(IS_C_INVERTED),
+      .IS_D_INVERTED(IS_D_INVERTED),
+      .IS_CLR_INVERTED(IS_CLR_INVERTED)
+    ) _TECHMAP_REPLACE_ (
+      .D(D), .Q($Q), .C(C), .CE(CE), .CLR(CLR)
+                                           // ^^^ Note that async
+                                           //     control is not directly
+                                           //     supported by abc9 but its
+                                           //     behaviour is captured by
+                                           //     $__ABC9_ASYNC0 below
+    );
+    // Since this is an async flop, async behaviour is dealt with here
+    $__ABC9_ASYNC0 abc_async (.A($QQ), .S(CLR ^ IS_CLR_INVERTED), .Y(QQ));
+  end endgenerate
+  $__ABC9_FF_ abc9_ff (.D($Q), .Q($QQ));
+
+  // Special signals
+  wire [1:0] abc9_ff.clock = {C, IS_C_INVERTED};
+  wire [0:0] abc9_ff.init = 1'b0;
+  wire [0:0] _TECHMAP_REPLACE_.abc9_ff.Q = $QQ;
+endmodule
+module FDCE_1 (output Q, input C, CE, D, CLR);
+  parameter [0:0] INIT = 1'b0;
+  wire QQ, $Q, $QQ;
+  generate if (INIT == 1'b1) begin
+    assign Q = ~QQ;
+    FDPE_1 #(
+      .INIT(1'b0)
+    ) _TECHMAP_REPLACE_ (
+      .D(~D), .Q($Q), .C(C), .CE(CE), .PRE(CLR)
+                                            // ^^^ Note that async
+                                            //     control is not directly
+                                            //     supported by abc9 but its
+                                            //     behaviour is captured by
+                                            //     $__ABC9_ASYNC1 below
+    );
+    $__ABC9_ASYNC1 abc_async (.A($QQ), .S(CLR), .Y(QQ));
+  end
+  else begin
+    assign Q = QQ;
+    FDCE_1 #(
+      .INIT(1'b0)
+    ) _TECHMAP_REPLACE_ (
+      .D(D), .Q($Q), .C(C), .CE(CE), .CLR(CLR)
+                                           // ^^^ Note that async
+                                           //     control is not directly
+                                           //     supported by abc9 but its
+                                           //     behaviour is captured by
+                                           //     $__ABC9_ASYNC0 below
+    );
+    $__ABC9_ASYNC0 abc_async (.A($QQ), .S(CLR), .Y(QQ));
+  end endgenerate
+  $__ABC9_FF_ abc9_ff (.D($Q), .Q($QQ));
+
+  // Special signals
+  wire [1:0] abc9_ff.clock = {C, 1'b1 /* IS_C_INVERTED */};
+  wire [0:0] abc9_ff.init = 1'b0;
+  wire [0:0] _TECHMAP_REPLACE_.abc9_ff.Q = $QQ;
+endmodule
+
+module FDPE (output Q, input C, CE, D, PRE);
+  parameter [0:0] INIT = 1'b1;
+  parameter [0:0] IS_C_INVERTED = 1'b0;
+  parameter [0:0] IS_D_INVERTED = 1'b0;
+  parameter [0:0] IS_PRE_INVERTED = 1'b0;
+  wire QQ, $Q, $QQ;
+  generate if (INIT == 1'b1) begin
+    assign Q = ~QQ;
+    FDCE #(
+      .INIT(1'b0),
+      .IS_C_INVERTED(IS_C_INVERTED),
+      .IS_D_INVERTED(IS_D_INVERTED),
+      .IS_CLR_INVERTED(IS_PRE_INVERTED),
+    ) _TECHMAP_REPLACE_ (
+      .D(~D), .Q($Q), .C(C), .CE(CE), .CLR(PRE)
+                                            // ^^^ Note that async
+                                            //     control is not directly
+                                            //     supported by abc9 but its
+                                            //     behaviour is captured by
+                                            //     $__ABC9_ASYNC0 below
+    );
+    $__ABC9_ASYNC0 abc_async (.A($QQ), .S(PRE ^ IS_PRE_INVERTED), .Y(QQ));
+  end
+  else begin
+    assign Q = QQ;
+    FDPE #(
+      .INIT(1'b0),
+      .IS_C_INVERTED(IS_C_INVERTED),
+      .IS_D_INVERTED(IS_D_INVERTED),
+      .IS_PRE_INVERTED(IS_PRE_INVERTED),
+    ) _TECHMAP_REPLACE_ (
+      .D(D), .Q($Q), .C(C), .CE(CE), .PRE(PRE)
+                                           // ^^^ Note that async
+                                           //     control is not directly
+                                           //     supported by abc9 but its
+                                           //     behaviour is captured by
+                                           //     $__ABC9_ASYNC1 below
+    );
+    $__ABC9_ASYNC1 abc_async (.A($QQ), .S(PRE ^ IS_PRE_INVERTED), .Y(QQ));
+  end endgenerate
+  $__ABC9_FF_ abc9_ff (.D($Q), .Q($QQ));
+
+  // Special signals
+  wire [1:0] abc9_ff.clock = {C, IS_C_INVERTED};
+  wire [0:0] abc9_ff.init = 1'b0;
+  wire [0:0] _TECHMAP_REPLACE_.abc9_ff.Q = $QQ;
+endmodule
+module FDPE_1 (output Q, input C, CE, D, PRE);
+  parameter [0:0] INIT = 1'b1;
+  wire QQ, $Q, $QQ;
+  generate if (INIT == 1'b1) begin
+    assign Q = ~QQ;
+    FDCE_1 #(
+      .INIT(1'b0)
+    ) _TECHMAP_REPLACE_ (
+      .D(~D), .Q($Q), .C(C), .CE(CE), .CLR(PRE)
+                                            // ^^^ Note that async
+                                            //     control is not directly
+                                            //     supported by abc9 but its
+                                            //     behaviour is captured by
+                                            //     $__ABC9_ASYNC0 below
+    );
+    $__ABC9_ASYNC0 abc_async (.A($QQ), .S(PRE), .Y(QQ));
+  end
+  else begin
+    assign Q = QQ;
+    FDPE_1 #(
+      .INIT(1'b0)
+    ) _TECHMAP_REPLACE_ (
+      .D(D), .Q($Q), .C(C), .CE(CE), .PRE(PRE)
+                                           // ^^^ Note that async
+                                           //     control is not directly
+                                           //     supported by abc9 but its
+                                           //     behaviour is captured by
+                                           //     $__ABC9_ASYNC1 below
+    );
+    $__ABC9_ASYNC1 abc_async (.A($QQ), .S(PRE), .Y(QQ));
+  end endgenerate
+  $__ABC9_FF_ abc9_ff (.D($Q), .Q($QQ));
+
+  // Special signals
+  wire [1:0] abc9_ff.clock = {C, 1'b1 /* IS_C_INVERTED */};
+  wire [0:0] abc9_ff.init = 1'b0;
+  wire [0:0] _TECHMAP_REPLACE_.abc9_ff.Q = $QQ;
+endmodule
+`endif
+
+// Attach a (combinatorial) black-box onto the output
+//   of thes LUTRAM primitives to capture their
+//   asynchronous read behaviour
 module RAM32X1D (
   output DPO, SPO,
   (* techmap_autopurge *) input  D,
@@ -30,17 +388,17 @@ module RAM32X1D (
 );
   parameter INIT = 32'h0;
   parameter IS_WCLK_INVERTED = 1'b0;
-  wire \$DPO , \$SPO ;
+  wire $DPO, $SPO;
   RAM32X1D #(
     .INIT(INIT), .IS_WCLK_INVERTED(IS_WCLK_INVERTED)
   ) _TECHMAP_REPLACE_ (
-    .DPO(\$DPO ), .SPO(\$SPO ),
+    .DPO($DPO), .SPO($SPO),
     .D(D), .WCLK(WCLK), .WE(WE),
     .A0(A0), .A1(A1), .A2(A2), .A3(A3), .A4(A4),
     .DPRA0(DPRA0), .DPRA1(DPRA1), .DPRA2(DPRA2), .DPRA3(DPRA3), .DPRA4(DPRA4)
   );
-  \$__ABC9_LUT6 spo (.A(\$SPO ), .S({1'b1, A4, A3, A2, A1, A0}), .Y(SPO));
-  \$__ABC9_LUT6 dpo (.A(\$DPO ), .S({1'b1, DPRA4, DPRA3, DPRA2, DPRA1, DPRA0}), .Y(DPO));
+  $__ABC9_LUT6 spo (.A($SPO), .S({1'b1, A4, A3, A2, A1, A0}), .Y(SPO));
+  $__ABC9_LUT6 dpo (.A($DPO), .S({1'b1, DPRA4, DPRA3, DPRA2, DPRA1, DPRA0}), .Y(DPO));
 endmodule
 
 module RAM64X1D (
@@ -53,17 +411,17 @@ module RAM64X1D (
 );
   parameter INIT = 64'h0;
   parameter IS_WCLK_INVERTED = 1'b0;
-  wire \$DPO , \$SPO ;
+  wire $DPO, $SPO;
   RAM64X1D #(
     .INIT(INIT), .IS_WCLK_INVERTED(IS_WCLK_INVERTED)
   ) _TECHMAP_REPLACE_ (
-    .DPO(\$DPO ), .SPO(\$SPO ),
+    .DPO($DPO), .SPO($SPO),
     .D(D), .WCLK(WCLK), .WE(WE),
     .A0(A0), .A1(A1), .A2(A2), .A3(A3), .A4(A4), .A5(A5),
     .DPRA0(DPRA0), .DPRA1(DPRA1), .DPRA2(DPRA2), .DPRA3(DPRA3), .DPRA4(DPRA4), .DPRA5(DPRA5)
   );
-  \$__ABC9_LUT6 spo (.A(\$SPO ), .S({A5, A4, A3, A2, A1, A0}), .Y(SPO));
-  \$__ABC9_LUT6 dpo (.A(\$DPO ), .S({DPRA5, DPRA4, DPRA3, DPRA2, DPRA1, DPRA0}), .Y(DPO));
+  $__ABC9_LUT6 spo (.A($SPO), .S({A5, A4, A3, A2, A1, A0}), .Y(SPO));
+  $__ABC9_LUT6 dpo (.A($DPO), .S({DPRA5, DPRA4, DPRA3, DPRA2, DPRA1, DPRA0}), .Y(DPO));
 endmodule
 
 module RAM128X1D (
@@ -75,17 +433,17 @@ module RAM128X1D (
 );
   parameter INIT = 128'h0;
   parameter IS_WCLK_INVERTED = 1'b0;
-  wire \$DPO , \$SPO ;
+  wire $DPO, $SPO;
   RAM128X1D #(
     .INIT(INIT), .IS_WCLK_INVERTED(IS_WCLK_INVERTED)
   ) _TECHMAP_REPLACE_ (
-    .DPO(\$DPO ), .SPO(\$SPO ),
+    .DPO($DPO), .SPO($SPO),
     .D(D), .WCLK(WCLK), .WE(WE),
     .A(A),
     .DPRA(DPRA)
   );
-  \$__ABC9_LUT7 spo (.A(\$SPO ), .S(A), .Y(SPO));
-  \$__ABC9_LUT7 dpo (.A(\$DPO ), .S(DPRA), .Y(DPO));
+  $__ABC9_LUT7 spo (.A($SPO), .S(A), .Y(SPO));
+  $__ABC9_LUT7 dpo (.A($DPO), .S(DPRA), .Y(DPO));
 endmodule
 
 module RAM32M (
@@ -109,24 +467,24 @@ module RAM32M (
   parameter [63:0] INIT_C = 64'h0000000000000000;
   parameter [63:0] INIT_D = 64'h0000000000000000;
   parameter [0:0] IS_WCLK_INVERTED = 1'b0;
-  wire [1:0] \$DOA , \$DOB , \$DOC , \$DOD ;
+  wire [1:0] $DOA, $DOB, $DOC, $DOD;
   RAM32M #(
     .INIT_A(INIT_A), .INIT_B(INIT_B), .INIT_C(INIT_C), .INIT_D(INIT_D),
     .IS_WCLK_INVERTED(IS_WCLK_INVERTED)
   ) _TECHMAP_REPLACE_ (
-    .DOA(\$DOA ), .DOB(\$DOB ), .DOC(\$DOC ), .DOD(\$DOD ),
+    .DOA($DOA), .DOB($DOB), .DOC($DOC), .DOD($DOD),
     .WCLK(WCLK), .WE(WE),
     .ADDRA(ADDRA), .ADDRB(ADDRB), .ADDRC(ADDRC), .ADDRD(ADDRD),
     .DIA(DIA), .DIB(DIB), .DIC(DIC), .DID(DID)
   );
-  \$__ABC9_LUT6 doa0 (.A(\$DOA [0]), .S({1'b1, ADDRA}), .Y(DOA[0]));
-  \$__ABC9_LUT6 doa1 (.A(\$DOA [1]), .S({1'b1, ADDRA}), .Y(DOA[1]));
-  \$__ABC9_LUT6 dob0 (.A(\$DOB [0]), .S({1'b1, ADDRB}), .Y(DOB[0]));
-  \$__ABC9_LUT6 dob1 (.A(\$DOB [1]), .S({1'b1, ADDRB}), .Y(DOB[1]));
-  \$__ABC9_LUT6 doc0 (.A(\$DOC [0]), .S({1'b1, ADDRC}), .Y(DOC[0]));
-  \$__ABC9_LUT6 doc1 (.A(\$DOC [1]), .S({1'b1, ADDRC}), .Y(DOC[1]));
-  \$__ABC9_LUT6 dod0 (.A(\$DOD [0]), .S({1'b1, ADDRD}), .Y(DOD[0]));
-  \$__ABC9_LUT6 dod1 (.A(\$DOD [1]), .S({1'b1, ADDRD}), .Y(DOD[1]));
+  $__ABC9_LUT6 doa0 (.A($DOA[0]), .S({1'b1, ADDRA}), .Y(DOA[0]));
+  $__ABC9_LUT6 doa1 (.A($DOA[1]), .S({1'b1, ADDRA}), .Y(DOA[1]));
+  $__ABC9_LUT6 dob0 (.A($DOB[0]), .S({1'b1, ADDRB}), .Y(DOB[0]));
+  $__ABC9_LUT6 dob1 (.A($DOB[1]), .S({1'b1, ADDRB}), .Y(DOB[1]));
+  $__ABC9_LUT6 doc0 (.A($DOC[0]), .S({1'b1, ADDRC}), .Y(DOC[0]));
+  $__ABC9_LUT6 doc1 (.A($DOC[1]), .S({1'b1, ADDRC}), .Y(DOC[1]));
+  $__ABC9_LUT6 dod0 (.A($DOD[0]), .S({1'b1, ADDRD}), .Y(DOD[0]));
+  $__ABC9_LUT6 dod1 (.A($DOD[1]), .S({1'b1, ADDRD}), .Y(DOD[1]));
 endmodule
 
 module RAM64M (
@@ -150,20 +508,20 @@ module RAM64M (
   parameter [63:0] INIT_C = 64'h0000000000000000;
   parameter [63:0] INIT_D = 64'h0000000000000000;
   parameter [0:0] IS_WCLK_INVERTED = 1'b0;
-  wire \$DOA , \$DOB , \$DOC , \$DOD ;
+  wire $DOA, $DOB, $DOC, $DOD;
   RAM64M #(
     .INIT_A(INIT_A), .INIT_B(INIT_B), .INIT_C(INIT_C), .INIT_D(INIT_D),
     .IS_WCLK_INVERTED(IS_WCLK_INVERTED)
   ) _TECHMAP_REPLACE_ (
-    .DOA(\$DOA ), .DOB(\$DOB ), .DOC(\$DOC ), .DOD(\$DOD ),
+    .DOA($DOA), .DOB($DOB), .DOC($DOC), .DOD($DOD),
     .WCLK(WCLK), .WE(WE),
     .ADDRA(ADDRA), .ADDRB(ADDRB), .ADDRC(ADDRC), .ADDRD(ADDRD),
     .DIA(DIA), .DIB(DIB), .DIC(DIC), .DID(DID)
   );
-  \$__ABC9_LUT6 doa (.A(\$DOA ), .S(ADDRA), .Y(DOA));
-  \$__ABC9_LUT6 dob (.A(\$DOB ), .S(ADDRB), .Y(DOB));
-  \$__ABC9_LUT6 doc (.A(\$DOC ), .S(ADDRC), .Y(DOC));
-  \$__ABC9_LUT6 dod (.A(\$DOD ), .S(ADDRD), .Y(DOD));
+  $__ABC9_LUT6 doa (.A($DOA), .S(ADDRA), .Y(DOA));
+  $__ABC9_LUT6 dob (.A($DOB), .S(ADDRB), .Y(DOB));
+  $__ABC9_LUT6 doc (.A($DOC), .S(ADDRC), .Y(DOC));
+  $__ABC9_LUT6 dod (.A($DOD), .S(ADDRD), .Y(DOD));
 endmodule
 
 module SRL16E (
@@ -172,14 +530,14 @@ module SRL16E (
 );
   parameter [15:0] INIT = 16'h0000;
   parameter [0:0] IS_CLK_INVERTED = 1'b0;
-  wire \$Q ;
+  wire $Q;
   SRL16E #(
     .INIT(INIT), .IS_CLK_INVERTED(IS_CLK_INVERTED)
   ) _TECHMAP_REPLACE_ (
-    .Q(\$Q ),
+    .Q($Q),
     .A0(A0), .A1(A1), .A2(A2), .A3(A3), .CE(CE), .CLK(CLK), .D(D)
   );
-  \$__ABC9_LUT6 q (.A(\$Q ), .S({1'b1, A3, A2, A1, A0, 1'b1}), .Y(Q));
+  $__ABC9_LUT6 q (.A($Q), .S({1'b1, A3, A2, A1, A0, 1'b1}), .Y(Q));
 endmodule
 
 module SRLC32E (
@@ -190,14 +548,14 @@ module SRLC32E (
 );
   parameter [31:0] INIT = 32'h00000000;
   parameter [0:0] IS_CLK_INVERTED = 1'b0;
-  wire \$Q ;
+  wire $Q;
   SRLC32E #(
     .INIT(INIT), .IS_CLK_INVERTED(IS_CLK_INVERTED)
   ) _TECHMAP_REPLACE_ (
-    .Q(\$Q ), .Q31(Q31),
+    .Q($Q), .Q31(Q31),
     .A(A), .CE(CE), .CLK(CLK), .D(D)
   );
-  \$__ABC9_LUT6 q (.A(\$Q ), .S({1'b1, A}), .Y(Q));
+  $__ABC9_LUT6 q (.A($Q), .S({1'b1, A}), .Y(Q));
 endmodule
 
 module DSP48E1 (
@@ -386,15 +744,15 @@ __CELL__ #(
         if (AREG == 0 && MREG == 0 && PREG == 0)
             assign iA = A, pA = 1'bx;
         else
-            \$__ABC9_REG #(.WIDTH(30)) rA (.I(A), .O(iA), .Q(pA));
+            $__ABC9_REG #(.WIDTH(30)) rA (.I(A), .O(iA), .Q(pA));
         if (BREG == 0 && MREG == 0 && PREG == 0)
             assign iB = B, pB = 1'bx;
         else
-            \$__ABC9_REG #(.WIDTH(18)) rB (.I(B), .O(iB), .Q(pB));
+            $__ABC9_REG #(.WIDTH(18)) rB (.I(B), .O(iB), .Q(pB));
         if (CREG == 0 && PREG == 0)
             assign iC = C, pC = 1'bx;
         else
-            \$__ABC9_REG #(.WIDTH(48)) rC (.I(C), .O(iC), .Q(pC));
+            $__ABC9_REG #(.WIDTH(48)) rC (.I(C), .O(iC), .Q(pC));
         if (DREG == 0)
             assign iD = D;
         else if (techmap_guard)
@@ -405,27 +763,27 @@ __CELL__ #(
         assign pAD = 1'bx;
     if (PREG == 0) begin
         if (MREG == 1)
-        \$__ABC9_REG rM (.Q(pM));
+        $__ABC9_REG rM (.Q(pM));
         else
         assign pM = 1'bx;
         assign pP = 1'bx;
     end else begin
             assign pM = 1'bx;
-            \$__ABC9_REG rP (.Q(pP));
+            $__ABC9_REG rP (.Q(pP));
         end
 
         if (MREG == 0 && PREG == 0)
             assign mP = oP, mPCOUT = oPCOUT;
         else
             assign mP = 1'bx, mPCOUT = 1'bx;
-        \$__ABC9_DSP48E1_MULT_P_MUX muxP (
+        $__ABC9_DSP48E1_MULT_P_MUX muxP (
             .Aq(pA), .Bq(pB), .Cq(pC), .Dq(pD), .ADq(pAD), .I(oP), .Mq(pM), .P(mP), .Pq(pP), .O(P)
         );
-        \$__ABC9_DSP48E1_MULT_PCOUT_MUX muxPCOUT (
+        $__ABC9_DSP48E1_MULT_PCOUT_MUX muxPCOUT (
             .Aq(pA), .Bq(pB), .Cq(pC), .Dq(pD), .ADq(pAD), .I(oPCOUT), .Mq(pM), .P(mPCOUT), .Pq(pP), .O(PCOUT)
         );
 
-        `DSP48E1_INST(\$__ABC9_DSP48E1_MULT )
+        `DSP48E1_INST($__ABC9_DSP48E1_MULT )
     end
     else if (USE_MULT == "MULTIPLY" && USE_DPORT == "TRUE") begin
         // Disconnect the A-input if MREG is enabled, since
@@ -433,26 +791,26 @@ __CELL__ #(
         if (AREG == 0 && ADREG == 0 && MREG == 0 && PREG == 0)
             assign iA = A, pA = 1'bx;
         else
-            \$__ABC9_REG #(.WIDTH(30)) rA (.I(A), .O(iA), .Q(pA));
+            $__ABC9_REG #(.WIDTH(30)) rA (.I(A), .O(iA), .Q(pA));
         if (BREG == 0 && MREG == 0 && PREG == 0)
             assign iB = B, pB = 1'bx;
         else
-            \$__ABC9_REG #(.WIDTH(18)) rB (.I(B), .O(iB), .Q(pB));
+            $__ABC9_REG #(.WIDTH(18)) rB (.I(B), .O(iB), .Q(pB));
         if (CREG == 0 && PREG == 0)
             assign iC = C, pC = 1'bx;
         else
-            \$__ABC9_REG #(.WIDTH(48)) rC (.I(C), .O(iC), .Q(pC));
+            $__ABC9_REG #(.WIDTH(48)) rC (.I(C), .O(iC), .Q(pC));
         if (DREG == 0 && ADREG == 0)
             assign iD = D, pD = 1'bx;
         else
-            \$__ABC9_REG #(.WIDTH(25)) rD (.I(D), .O(iD), .Q(pD));
+            $__ABC9_REG #(.WIDTH(25)) rD (.I(D), .O(iD), .Q(pD));
         if (PREG == 0) begin
             if (MREG == 1) begin
                 assign pAD = 1'bx;
-        \$__ABC9_REG rM (.Q(pM));
+        $__ABC9_REG rM (.Q(pM));
             end else begin
                 if (ADREG == 1)
-                    \$__ABC9_REG rAD (.Q(pAD));
+                    $__ABC9_REG rAD (.Q(pAD));
                 else
                     assign pAD = 1'bx;
         assign pM = 1'bx;
@@ -460,21 +818,21 @@ __CELL__ #(
         assign pP = 1'bx;
     end else begin
             assign pAD = 1'bx, pM = 1'bx;
-            \$__ABC9_REG rP (.Q(pP));
+            $__ABC9_REG rP (.Q(pP));
         end
 
         if (MREG == 0 && PREG == 0)
             assign mP = oP, mPCOUT = oPCOUT;
         else
             assign mP = 1'bx, mPCOUT = 1'bx;
-        \$__ABC9_DSP48E1_MULT_DPORT_P_MUX muxP (
+        $__ABC9_DSP48E1_MULT_DPORT_P_MUX muxP (
             .Aq(pA), .Bq(pB), .Cq(pC), .Dq(pD), .ADq(pAD), .I(oP), .Mq(pM), .P(mP), .Pq(pP), .O(P)
         );
-        \$__ABC9_DSP48E1_MULT_DPORT_PCOUT_MUX muxPCOUT (
+        $__ABC9_DSP48E1_MULT_DPORT_PCOUT_MUX muxPCOUT (
             .Aq(pA), .Bq(pB), .Cq(pC), .Dq(pD), .ADq(pAD), .I(oPCOUT), .Mq(pM), .P(mPCOUT), .Pq(pP), .O(PCOUT)
         );
 
-        `DSP48E1_INST(\$__ABC9_DSP48E1_MULT_DPORT )
+        `DSP48E1_INST($__ABC9_DSP48E1_MULT_DPORT )
     end
     else if (USE_MULT == "NONE" && USE_DPORT == "FALSE") begin
         // Disconnect the A-input if MREG is enabled, since
@@ -482,15 +840,15 @@ __CELL__ #(
         if (AREG == 0 && PREG == 0)
             assign iA = A, pA = 1'bx;
         else
-            \$__ABC9_REG #(.WIDTH(30)) rA (.I(A), .O(iA), .Q(pA));
+            $__ABC9_REG #(.WIDTH(30)) rA (.I(A), .O(iA), .Q(pA));
         if (BREG == 0 && PREG == 0)
             assign iB = B, pB = 1'bx;
         else
-            \$__ABC9_REG #(.WIDTH(18)) rB (.I(B), .O(iB), .Q(pB));
+            $__ABC9_REG #(.WIDTH(18)) rB (.I(B), .O(iB), .Q(pB));
         if (CREG == 0 && PREG == 0)
             assign iC = C, pC = 1'bx;
         else
-            \$__ABC9_REG #(.WIDTH(48)) rC (.I(C), .O(iC), .Q(pC));
+            $__ABC9_REG #(.WIDTH(48)) rC (.I(C), .O(iC), .Q(pC));
         if (DREG == 1 && techmap_guard)
             $error("Invalid DSP48E1 configuration: DREG enabled but USE_DPORT == \"FALSE\"");
         assign pD = 1'bx;
@@ -501,7 +859,7 @@ __CELL__ #(
             $error("Invalid DSP48E1 configuration: MREG enabled but USE_MULT == \"NONE\"");
         assign pM = 1'bx;
         if (PREG == 1)
-            \$__ABC9_REG rP (.Q(pP));
+            $__ABC9_REG rP (.Q(pP));
         else
             assign pP = 1'bx;
 
@@ -509,14 +867,14 @@ __CELL__ #(
             assign mP = oP, mPCOUT = oPCOUT;
         else
             assign mP = 1'bx, mPCOUT = 1'bx;
-        \$__ABC9_DSP48E1_P_MUX muxP (
+        $__ABC9_DSP48E1_P_MUX muxP (
             .Aq(pA), .Bq(pB), .Cq(pC), .Dq(pD), .ADq(pAD), .I(oP), .Mq(pM), .P(mP), .Pq(pP), .O(P)
         );
-        \$__ABC9_DSP48E1_PCOUT_MUX muxPCOUT (
+        $__ABC9_DSP48E1_PCOUT_MUX muxPCOUT (
             .Aq(pA), .Bq(pB), .Cq(pC), .Dq(pD), .ADq(pAD), .I(oPCOUT), .Mq(pM), .P(mPCOUT), .Pq(pP), .O(PCOUT)
         );
 
-        `DSP48E1_INST(\$__ABC9_DSP48E1 )
+        `DSP48E1_INST($__ABC9_DSP48E1 )
     end
     else
         $error("Invalid DSP48E1 configuration");
diff --git a/techlibs/xilinx/abc9_model.v b/techlibs/xilinx/abc9_model.v
index 8c8e1556c..11250123d 100644
--- a/techlibs/xilinx/abc9_model.v
+++ b/techlibs/xilinx/abc9_model.v
@@ -30,7 +30,22 @@ module \$__XILINX_MUXF78 (output O, input I0, I1, I2, I3, S0, S1);
                 : (S0 ? I1 : I0);
 endmodule
 
-// Box to emulate comb/seq behaviour of RAMD{32,64} and SRL{16,32}
+module \$__ABC9_FF_ (input D, output Q);
+endmodule
+
+// Box to emulate async behaviour of FDC*
+(* abc9_box_id = 1000, lib_whitebox *)
+module \$__ABC9_ASYNC0 (input A, S, output Y);
+  assign Y = S ? 1'b0 : A;
+endmodule
+
+// Box to emulate async behaviour of FDP*
+(* abc9_box_id = 1001, lib_whitebox *)
+module \$__ABC9_ASYNC1 (input A, S, output Y);
+  assign Y = S ? 1'b0 : A;
+endmodule
+
+// Box to emulate comb/seq behaviour of RAM{32,64} and SRL{16,32}
 //   Necessary since RAMD* and SRL* have both combinatorial (i.e.
 //   same-cycle read operation) and sequential (write operation
 //   is only committed on the next clock edge).
@@ -39,7 +54,7 @@ endmodule
 (* abc9_box_id=2000 *)
 module \$__ABC9_LUT6 (input A, input [5:0] S, output Y);
 endmodule
-// Box to emulate comb/seq behaviour of RAMD128
+// Box to emulate comb/seq behaviour of RAM128
 (* abc9_box_id=2001 *)
 module \$__ABC9_LUT7 (input A, input [6:0] S, output Y);
 endmodule
diff --git a/techlibs/xilinx/abc9_unmap.v b/techlibs/xilinx/abc9_unmap.v
index ad6469702..46526007d 100644
--- a/techlibs/xilinx/abc9_unmap.v
+++ b/techlibs/xilinx/abc9_unmap.v
@@ -20,6 +20,15 @@
 
 // ============================================================================
 
+(* techmap_celltype = "$__ABC9_ASYNC0 $__ABC9_ASYNC1" *)
+module \$__ABC9_ASYNC01 (input A, S, output Y);
+  assign Y = A;
+endmodule
+
+module \$__ABC9_FF_ (input D, output Q);
+  assign Q = D;
+endmodule
+
 module \$__ABC9_LUT6 (input A, input [5:0] S, output Y);
   assign Y = A;
 endmodule
diff --git a/techlibs/xilinx/abc9_xc7.box b/techlibs/xilinx/abc9_xc7.box
index c6df54667..1dff88509 100644
--- a/techlibs/xilinx/abc9_xc7.box
+++ b/techlibs/xilinx/abc9_xc7.box
@@ -1,64 +1,142 @@
 # Max delays from https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf
 #                 https://github.com/SymbiFlow/prjxray-db/blob/23c8b0851f979f0799318eaca90174413a46b257/artix7/timings/slicel.sdf
 
-# NB: Inputs/Outputs must be ordered alphabetically
-#     (with exceptions for carry in/out)
+# NB: Box inputs/outputs must each be in the same order
+#     as their corresponding module definition
+#     (with exceptions detailed below)
 
-# Average across F7[AB]MUX
-# Inputs: I0 I1 S0
-# Outputs: O
-MUXF7 1 1 3 1
-204 208 286
+# Box 1 : MUXF7
+#   Max delays from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf#L451-L453
+# name ID w/b ins outs
+MUXF7  1  1   3   1
+#I0 I1  S0
+204 208 286 # O
 
-# Inputs: I0 I1 S0
-# Outputs: O
-MUXF8 2 1 3 1
-104 94 273
+# Box 2 : MUXF8
+#   Max delays from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf#L462-L464
+# name ID w/b ins outs
+MUXF8  2  1   3   1
+#I0 I1 S0
+104 94 273 # O
 
-# Box containing MUXF7.[AB] + MUXF8,
-#   Necessary to make these an atomic unit so that
-#   ABC cannot optimise just one of the MUXF7 away
-#   and expect to save on its delay
-# Inputs: I0 I1 I2 I3 S0 S1
-# Outputs: O
-$__XILINX_MUXF78 3 1 6 1
-294 297 311 317 390 273
+# Box 3 : $__MUXF78
+#         (private cell used to preserve 2xMUXF7 + 1xMUXF8
+#          an atomic unit so that ABC cannot optimise just
+#          one of the MUXF7 away and expect to save on its
+#          delay, since MUXF8 is only reachable through an
+#          MUXF7)
+# name    ID w/b ins outs
+$__MUXF78 3  1   6   1
+#I0 I1  I2  I3  S0  S1
+294 297 311 317 390 273 # O
 
-# CARRY4 + CARRY4_[ABCD]X
-# Inputs: CYINIT DI0 DI1 DI2 DI3 S0 S1 S2 S3 CI
-# Outputs:  O0 O1 O2 O3 CO0 CO1 CO2 CO3
-#   (NB: carry chain input/output must be last
-#        input/output and the entire bus has been
+# Box 4 : CARRY4 + CARRY4_[ABCD]X
+#   (Exception: carry chain input/output must be the
+#        last input and output and the entire bus has been
 #        moved there overriding the otherwise
 #        alphabetical ordering)
-CARRY4 4 1 10 8
-482 -   -   -   -   223 -   -   -   222
-598 407 -   -   -   400 205 -   -   334
-584 556 537 -   -   523 558 226 -   239
-642 615 596 438 -   582 618 330 227 313
-536 379 -   -   -   340 -   -   -   271
-494 465 445 -   -   433 469 -   -   157
-592 540 520 356 -   512 548 292 -   228
-580 526 507 398 385 508 528 378 380 114
+#   Max delays from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf#L11-L46
+# name ID w/b ins outs
+CARRY4 4  1   10  8
+#CYINIT DI0 DI1 DI2 DI3 S0  S1  S2  S3  CI
+482     -   -   -   -   223 -   -   -   222 # O0
+598     407 -   -   -   400 205 -   -   334 # O1
+584     556 537 -   -   523 558 226 -   239 # O2
+642     615 596 438 -   582 618 330 227 313 # O3
+536     379 -   -   -   340 -   -   -   271 # CO0
+494     465 445 -   -   433 469 -   -   157 # CO1
+592     540 520 356 -   512 548 292 -   228 # CO2
+580     526 507 398 385 508 528 378 380 114 # CO3
 
+# Box 1000 : $__ABC9_ASYNC0
+#            (private cell to emulate async behaviour of FDC*)
+# name         ID   w/b ins outs
+$__ABC9_ASYNC0 1000 1   2   1
+#A S
+0  764 # Y
+
+# Box 1001 : $__ABC9_ASYNC1
+#            (private cell to emulate async behaviour of FDP*)
+# name         ID   w/b ins outs
+$__ABC9_ASYNC1 1001 1 2 1
+#A S
+0  764 # Y
+
+# Flop boxes:
+# * Max delays from https://github.com/SymbiFlow/prjxray-db/blob/23c8b0851f979f0799318eaca90174413a46b257/artix7/timings/slicel.sdf#L237-L251
+#                   https://github.com/SymbiFlow/prjxray-db/blob/23c8b0851f979f0799318eaca90174413a46b257/artix7/timings/slicel.sdf#L265-L277
+# * Exception: $abc9_currQ is a special input (located last) necessary for clock-enable functionality
+
+# Box 1100 : FDRE
+# name ID   w/b ins outs
+FDRE   1100 1   5   1
+#C CE  D   R   $abc9_currQ
+#0 109 -46 404 0
+0 109 0   404 0 # Q (-46ps Tsu clamped to 0)
+
+# Box 1101 : FDRE_1
+# name ID   w/b ins outs
+FDRE_1 1101 1   5   1
+#C CE  D   R   $abc9_currQ
+#0 109 -46 404 0
+0 109 0   404 0 # Q (-46ps Tsu clamped to 0)
+
+# Box 1102 : FDSE
+# name ID   w/b ins outs
+FDSE   1102 1   5   1
+#C CE  D   R   $abc9_currQ
+#0 109 -46 404 0
+0 109 0   404 0 # Q (-46ps Tsu clamped to 0)
+
+# Box 1103 : FDSE_1
+# name ID   w/b ins outs
+FDSE_1 1103 1   5   1
+#C CE  D   R   $abc9_currQ
+#0 109 -46 404 0
+0 109 0   404 0 # Q (-46ps Tsu clamped to 0)
+
+# Box 1104 : FDCE
+# name ID   w/b ins outs
+FDCE   1104 1   5   1
+#C CE  CLR D   $abc9_currQ
+#0 109 764 -46 0
+0 109 764 0   0 # Q (-46ps Tsu clamped to 0)
+
+# Box 1105 : FDCE_1
+# name ID   w/b ins outs
+FDCE_1 1105 1   5   1
+#C CE  CLR D   $abc9_currQ
+#0 109 764 -46 0
+0 109 764 0   0 # Q (-46ps Tsu clamped to 0)
+
+# Box 1106 : FDPE
+# name ID   w/b ins outs
+FDPE   1106 1   5   1
+#C CE  D   PRE $abc9_currQ
+#0 109 -46 764 0
+0 109 0   764 0 # Q (-46ps Tsu clamped to 0)
+
+# Box 1107 : FDPE_1
+# name ID   w/b ins outs
+FDPE_1 1107 1   5   1
+#C CE  D   PRE $abc9_currQ
+#0 109 -46 764 0
+0 109 0   764 0 # Q (-46ps Tsu clamped to 0)
+
+# Box 2000 : $__ABC9_LUT6
+#            (private cell to emulate async behaviour of LUTRAMs)
 # SLICEM/A6LUT
-# Box to emulate comb/seq behaviour of RAMD{32,64} and SRL{16,32}
-#   Necessary since RAMD* and SRL* have both combinatorial (i.e.
-#   same-cycle read operation) and sequential (write operation
-#   is only committed on the next clock edge).
-#   To model the combinatorial path, such cells have to be split
-#   into comb and seq parts, with this box modelling only the former.
-# Inputs: A S0 S1 S2 S3 S4 S5
-# Outputs: Y
-$__ABC9_LUT6 2000 0 7 1
-0 642 631 472 407 238 127
+# name       ID   w/b ins outs
+$__ABC9_LUT6 2000 0   7   1
+#A S0  S1  S2  S3  S4  S5
+0  642 631 472 407 238 127 # Y
 
-# SLICEM/A6LUT + F7BMUX
-# Box to emulate comb/seq behaviour of RAMD128
-# Inputs: A S0 S1 S2 S3 S4 S5 S6
-# Outputs: DPO SPO
+# Box 2001 : $__ABC9_LUT6
+#            (private cell to emulate async behaviour of LUITRAMs)
+# name       ID   w/b ins outs
 $__ABC9_LUT7 2001 0 8 1
-0 1047 1036 877 812 643 532 478
+#A S0   S1   S2  S3  S4  S5  S6
+0  1047 1036 877 812 643 532 478 # Y
 
 # Boxes used to represent the comb/seq behaviour of DSP48E1
 #   With abc9_map.v responsible for disconnecting inputs to
@@ -70,308 +148,323 @@ $__ABC9_LUT7 2001 0 8 1
 #   the mux at zero time, the combinatorial delay through
 #   these muxes thus represents the clock-to-q delay at
 #   P/PCOUT.
-$__ABC9_DSP48E1_MULT_P_MUX 2100 0 103 48
-# A AD    B    C D                                                                                               I    M P                                                                                                Pq
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-2952 - 2813 1687 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1671 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 329
-$__ABC9_DSP48E1_MULT_PCOUT_MUX 2101 0 103 48
-# A AD    B    C D                                                                                               I   M P                                                                                                Pq
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
-3098 - 2960 1835 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1819 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 435
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-# A    AD    B    C    D                                                                                               I    M P                                                                                                Pq
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-$__ABC9_DSP48E1_PCOUT_MUX 2105 0 103 48
-# A AD    B    C D                                                                                               I    M P                                                                                                Pq
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+# name                     ID   w/b ins outs
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+# name          ID   w/b ins outs
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diff --git a/techlibs/xilinx/cells_sim.v b/techlibs/xilinx/cells_sim.v
index ed602fa6e..e9741555c 100644
--- a/techlibs/xilinx/cells_sim.v
+++ b/techlibs/xilinx/cells_sim.v
@@ -325,6 +325,7 @@ endmodule
 
 // Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf#L238-L250
 
+(* abc9_box_id=1100, lib_whitebox, abc9_flop *)
 module FDRE (
   (* abc9_arrival=303 *)
   output reg Q,
@@ -348,6 +349,20 @@ module FDRE (
   endcase endgenerate
 endmodule
 
+(* abc9_box_id=1101, lib_whitebox, abc9_flop *)
+module FDRE_1 (
+  (* abc9_arrival=303 *)
+  output reg Q,
+  (* clkbuf_sink *)
+  input C,
+  input CE, D, R
+);
+  parameter [0:0] INIT = 1'b0;
+  initial Q <= INIT;
+  always @(negedge C) if (R) Q <= 1'b0; else if (CE) Q <= D;
+endmodule
+
+(* abc9_box_id=1102, lib_whitebox, abc9_flop *)
 module FDSE (
   (* abc9_arrival=303 *)
   output reg Q,
@@ -371,6 +386,19 @@ module FDSE (
   endcase endgenerate
 endmodule
 
+(* abc9_box_id=1103, lib_whitebox, abc9_flop *)
+module FDSE_1 (
+  (* abc9_arrival=303 *)
+  output reg Q,
+  (* clkbuf_sink *)
+  input C,
+  input CE, D, S
+);
+  parameter [0:0] INIT = 1'b1;
+  initial Q <= INIT;
+  always @(negedge C) if (S) Q <= 1'b1; else if (CE) Q <= D;
+endmodule
+
 module FDRSE (
   output reg Q,
   (* clkbuf_sink *)
@@ -406,6 +434,7 @@ module FDRSE (
       Q <= d;
 endmodule
 
+(* abc9_box_id=1104, lib_whitebox, abc9_flop *)
 module FDCE (
   (* abc9_arrival=303 *)
   output reg Q,
@@ -413,10 +442,10 @@ module FDCE (
   (* invertible_pin = "IS_C_INVERTED" *)
   input C,
   input CE,
-  (* invertible_pin = "IS_D_INVERTED" *)
-  input D,
   (* invertible_pin = "IS_CLR_INVERTED" *)
-  input CLR
+  input CLR,
+  (* invertible_pin = "IS_D_INVERTED" *)
+  input D
 );
   parameter [0:0] INIT = 1'b0;
   parameter [0:0] IS_C_INVERTED = 1'b0;
@@ -431,6 +460,20 @@ module FDCE (
   endcase endgenerate
 endmodule
 
+(* abc9_box_id=1105, lib_whitebox, abc9_flop *)
+module FDCE_1 (
+  (* abc9_arrival=303 *)
+  output reg Q,
+  (* clkbuf_sink *)
+  input C,
+  input CE, D, CLR
+);
+  parameter [0:0] INIT = 1'b0;
+  initial Q <= INIT;
+  always @(negedge C, posedge CLR) if (CLR) Q <= 1'b0; else if (CE) Q <= D;
+endmodule
+
+(* abc9_box_id=1106, lib_whitebox, abc9_flop *)
 module FDPE (
   (* abc9_arrival=303 *)
   output reg Q,
@@ -456,6 +499,19 @@ module FDPE (
   endcase endgenerate
 endmodule
 
+(* abc9_box_id=1107, lib_whitebox, abc9_flop *)
+module FDPE_1 (
+  (* abc9_arrival=303 *)
+  output reg Q,
+  (* clkbuf_sink *)
+  input C,
+  input CE, D, PRE
+);
+  parameter [0:0] INIT = 1'b1;
+  initial Q <= INIT;
+  always @(negedge C, posedge PRE) if (PRE) Q <= 1'b1; else if (CE) Q <= D;
+endmodule
+
 module FDCPE (
   output wire Q,
   (* clkbuf_sink *)
@@ -501,54 +557,6 @@ module FDCPE (
   assign Q = qs ? qp : qc;
 endmodule
 
-module FDRE_1 (
-  (* abc9_arrival=303 *)
-  output reg Q,
-  (* clkbuf_sink *)
-  input C,
-  input CE, D, R
-);
-  parameter [0:0] INIT = 1'b0;
-  initial Q <= INIT;
-  always @(negedge C) if (R) Q <= 1'b0; else if(CE) Q <= D;
-endmodule
-
-module FDSE_1 (
-  (* abc9_arrival=303 *)
-  output reg Q,
-  (* clkbuf_sink *)
-  input C,
-  input CE, D, S
-);
-  parameter [0:0] INIT = 1'b1;
-  initial Q <= INIT;
-  always @(negedge C) if (S) Q <= 1'b1; else if(CE) Q <= D;
-endmodule
-
-module FDCE_1 (
-  (* abc9_arrival=303 *)
-  output reg Q,
-  (* clkbuf_sink *)
-  input C,
-  input CE, D, CLR
-);
-  parameter [0:0] INIT = 1'b0;
-  initial Q <= INIT;
-  always @(negedge C, posedge CLR) if (CLR) Q <= 1'b0; else if (CE) Q <= D;
-endmodule
-
-module FDPE_1 (
-  (* abc9_arrival=303 *)
-  output reg Q,
-  (* clkbuf_sink *)
-  input C,
-  input CE, D, PRE
-);
-  parameter [0:0] INIT = 1'b1;
-  initial Q <= INIT;
-  always @(negedge C, posedge PRE) if (PRE) Q <= 1'b1; else if (CE) Q <= D;
-endmodule
-
 module LDCE (
   output reg Q,
   (* invertible_pin = "IS_CLR_INVERTED" *)
@@ -1648,7 +1656,7 @@ module SRL16 (
 endmodule
 
 module SRL16E (
-  // Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L904-L905
+  // Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L905
   (* abc9_arrival=1472 *)
   output Q,
   input A0, A1, A2, A3, CE,
@@ -1712,9 +1720,10 @@ module SRLC16E (
 endmodule
 
 module SRLC32E (
-  // Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L904-L905
+  // Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L905
   (* abc9_arrival=1472 *)
   output Q,
+  // Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L904
   (* abc9_arrival=1114 *)
   output Q31,
   input [4:0] A,
@@ -2356,7 +2365,7 @@ module DSP48E1 (
     parameter [6:0] IS_OPMODE_INVERTED = 7'b0;
 
     initial begin
-`ifdef __ICARUS__
+`ifndef YOSYS
         if (AUTORESET_PATDET != "NO_RESET") $fatal(1, "Unsupported AUTORESET_PATDET value");
         if (SEL_MASK != "MASK")     $fatal(1, "Unsupported SEL_MASK value");
         if (SEL_PATTERN != "PATTERN") $fatal(1, "Unsupported SEL_PATTERN value");
@@ -2519,12 +2528,12 @@ module DSP48E1 (
         case (OPMODEr[1:0])
             2'b00: X = 48'b0;
             2'b01: begin X = $signed(Mrx);
-`ifdef __ICARUS__
+`ifndef YOSYS
                 if (OPMODEr[3:2] != 2'b01) $fatal(1, "OPMODEr[3:2] must be 2'b01 when OPMODEr[1:0] is 2'b01");
 `endif
             end
             2'b10: begin X = P;
-`ifdef __ICARUS__
+`ifndef YOSYS
                 if (PREG != 1) $fatal(1, "PREG must be 1 when OPMODEr[1:0] is 2'b10");
 `endif
             end
@@ -2536,7 +2545,7 @@ module DSP48E1 (
         case (OPMODEr[3:2])
             2'b00: Y = 48'b0;
             2'b01: begin Y = 48'b0; // FIXME: more accurate partial product modelling?
-`ifdef __ICARUS__
+`ifndef YOSYS
                 if (OPMODEr[1:0] != 2'b01) $fatal(1, "OPMODEr[1:0] must be 2'b01 when OPMODEr[3:2] is 2'b01");
 `endif
             end
@@ -2550,13 +2559,13 @@ module DSP48E1 (
             3'b000: Z = 48'b0;
             3'b001: Z = PCIN;
             3'b010: begin Z = P;
-`ifdef __ICARUS__
+`ifndef YOSYS
                 if (PREG != 1) $fatal(1, "PREG must be 1 when OPMODEr[6:4] i0s 3'b010");
 `endif
             end
             3'b011: Z = Cr;
             3'b100: begin Z = P;
-`ifdef __ICARUS__
+`ifndef YOSYS
                 if (PREG != 1) $fatal(1, "PREG must be 1 when OPMODEr[6:4] is 3'b100");
                 if (OPMODEr[3:0] != 4'b1000) $fatal(1, "OPMODEr[3:0] must be 4'b1000 when OPMODEr[6:4] i0s 3'b100");
 `endif
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index a19046911..51d2cbbd2 100644
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -64,7 +64,7 @@ struct SynthXilinxPass : public ScriptPass
 		log("        (this feature is experimental and incomplete)\n");
 		log("\n");
 		log("    -ise\n");
-		log("        generate an output netlist suitable for ISE (enables -iopad)\n");
+		log("        generate an output netlist suitable for ISE\n");
 		log("\n");
 		log("    -nobram\n");
 		log("        do not use block RAM cells in output netlist\n");
@@ -84,11 +84,9 @@ struct SynthXilinxPass : public ScriptPass
 		log("    -nodsp\n");
 		log("        do not use DSP48E1s to implement multipliers and associated logic\n");
 		log("\n");
-		log("    -iopad\n");
-		log("        enable I/O buffer insertion (selected automatically by -ise)\n");
-		log("\n");
 		log("    -noiopad\n");
-		log("        disable I/O buffer insertion (only useful with -ise)\n");
+		log("        disable I/O buffer insertion (useful for hierarchical or \n");
+		log("        out-of-context flows)\n");
 		log("\n");
 		log("    -noclkbuf\n");
 		log("        disable automatic clock buffer insertion\n");
@@ -109,8 +107,12 @@ struct SynthXilinxPass : public ScriptPass
 		log("    -flatten\n");
 		log("        flatten design before synthesis\n");
 		log("\n");
+		log("    -dff\n");
+		log("        run 'abc'/'abc9' with -dff option\n");
+		log("\n");
 		log("    -retime\n");
-		log("        run 'abc' with -dff option\n");
+		log("        run 'abc' with '-D 1' option to enable flip-flop retiming.\n");
+		log("        implies -dff.\n");
 		log("\n");
 		log("    -abc9\n");
 		log("        use new ABC9 flow (EXPERIMENTAL)\n");
@@ -122,7 +124,8 @@ struct SynthXilinxPass : public ScriptPass
 	}
 
 	std::string top_opt, edif_file, blif_file, family;
-	bool flatten, retime, vpr, ise, iopad, noiopad, noclkbuf, nobram, nolutram, nosrl, nocarry, nowidelut, nodsp, uram, abc9;
+	bool flatten, retime, vpr, ise, noiopad, noclkbuf, nobram, nolutram, nosrl, nocarry, nowidelut, nodsp, uram;
+	bool abc9, dff_mode;
 	bool flatten_before_abc;
 	int widemux;
 
@@ -136,7 +139,6 @@ struct SynthXilinxPass : public ScriptPass
 		retime = false;
 		vpr = false;
 		ise = false;
-		iopad = false;
 		noiopad = false;
 		noclkbuf = false;
 		nocarry = false;
@@ -148,6 +150,7 @@ struct SynthXilinxPass : public ScriptPass
 		nodsp = false;
 		uram = false;
 		abc9 = false;
+		dff_mode = false;
 		flatten_before_abc = false;
 		widemux = 0;
 	}
@@ -193,6 +196,7 @@ struct SynthXilinxPass : public ScriptPass
 				continue;
 			}
 			if (args[argidx] == "-retime") {
+				dff_mode = true;
 				retime = true;
 				continue;
 			}
@@ -213,7 +217,6 @@ struct SynthXilinxPass : public ScriptPass
 				continue;
 			}
 			if (args[argidx] == "-iopad") {
-				iopad = true;
 				continue;
 			}
 			if (args[argidx] == "-noiopad") {
@@ -256,6 +259,10 @@ struct SynthXilinxPass : public ScriptPass
 				uram = true;
 				continue;
 			}
+			if (args[argidx] == "-dff") {
+				dff_mode = true;
+				continue;
+			}
 			break;
 		}
 		extra_args(args, argidx, design);
@@ -282,7 +289,6 @@ struct SynthXilinxPass : public ScriptPass
 
 	void script() YS_OVERRIDE
 	{
-		bool do_iopad = iopad || (ise && !noiopad);
 		std::string ff_map_file;
 		if (help_mode)
 			ff_map_file = "+/xilinx/{family}_ff_map.v";
@@ -292,10 +298,11 @@ struct SynthXilinxPass : public ScriptPass
 			ff_map_file = "+/xilinx/xc7_ff_map.v";
 
 		if (check_label("begin")) {
+			std::string read_args;
 			if (vpr)
-				run("read_verilog -lib -D_EXPLICIT_CARRY +/xilinx/cells_sim.v");
-			else
-				run("read_verilog -lib +/xilinx/cells_sim.v");
+				read_args += " -D_EXPLICIT_CARRY";
+			read_args += " -lib +/xilinx/cells_sim.v";
+			run("read_verilog" + read_args);
 
 			run("read_verilog -lib +/xilinx/cells_xtra.v");
 
@@ -517,8 +524,8 @@ struct SynthXilinxPass : public ScriptPass
 
 		if (check_label("map_cells")) {
 			// Needs to be done before logic optimization, so that inverters (OE vs T) are handled.
-			if (help_mode || do_iopad)
-				run("iopadmap -bits -outpad OBUF I:O -inpad IBUF O:I -toutpad $__XILINX_TOUTPAD OE:I:O -tinoutpad $__XILINX_TINOUTPAD OE:O:I:IO A:top", "(only if '-iopad' or '-ise' and not '-noiopad')");
+			if (help_mode || !noiopad)
+				run("iopadmap -bits -outpad OBUF I:O -inpad IBUF O:I -toutpad $__XILINX_TOUTPAD OE:I:O -tinoutpad $__XILINX_TINOUTPAD OE:O:I:IO A:top", "(only if not '-noiopad')");
 			std::string techmap_args = "-map +/techmap.v -map +/xilinx/cells_map.v";
 			if (widemux > 0)
 				techmap_args += stringf(" -D MIN_MUX_INPUTS=%d", widemux);
@@ -537,12 +544,15 @@ struct SynthXilinxPass : public ScriptPass
 			if (flatten_before_abc)
 				run("flatten");
 			if (help_mode)
-				run("abc -luts 2:2,3,6:5[,10,20] [-dff]", "(option for 'nowidelut'; option for '-retime')");
+				run("abc -luts 2:2,3,6:5[,10,20] [-dff] [-D 1]", "(option for 'nowidelut', '-dff', '-retime')");
 			else if (abc9) {
 				if (family != "xc7")
 					log_warning("'synth_xilinx -abc9' not currently supported for the '%s' family, "
 							"will use timing for 'xc7' instead.\n", family.c_str());
-				run("techmap -map +/xilinx/abc9_map.v -max_iter 1");
+				std::string techmap_args = "-map +/xilinx/abc9_map.v -max_iter 1";
+				if (dff_mode)
+					techmap_args += " -D DFF_MODE";
+				run("techmap " + techmap_args);
 				run("read_verilog -icells -lib +/xilinx/abc9_model.v");
 				std::string abc9_opts = " -box +/xilinx/abc9_xc7.box";
 				abc9_opts += stringf(" -W %d", XC7_WIRE_DELAY);
@@ -551,13 +561,22 @@ struct SynthXilinxPass : public ScriptPass
 					abc9_opts += " -lut +/xilinx/abc9_xc7_nowide.lut";
 				else
 					abc9_opts += " -lut +/xilinx/abc9_xc7.lut";
+				if (dff_mode)
+					abc9_opts += " -dff";
 				run("abc9" + abc9_opts);
+				run("techmap -map +/xilinx/abc9_unmap.v");
 			}
 			else {
+				std::string abc_opts;
 				if (nowidelut)
-					run("abc -luts 2:2,3,6:5" + string(retime ? " -dff" : ""));
+					abc_opts += " -luts 2:2,3,6:5";
 				else
-					run("abc -luts 2:2,3,6:5,10,20" + string(retime ? " -dff" : ""));
+					abc_opts += " -luts 2:2,3,6:5,10,20";
+				if (dff_mode)
+					abc_opts += " -dff";
+				if (retime)
+					abc_opts += " -D 1";
+				run("abc" + abc_opts);
 			}
 			run("clean");
 
@@ -567,14 +586,11 @@ struct SynthXilinxPass : public ScriptPass
 				run("xilinx_srl -fixed -minlen 3", "(skip if '-nosrl')");
 			std::string techmap_args = "-map +/xilinx/lut_map.v -map +/xilinx/cells_map.v";
 			if (help_mode)
-				techmap_args += " [-map " + ff_map_file + "]";
-			else if (abc9)
-				techmap_args += " -map +/xilinx/abc9_unmap.v";
-			else
-				techmap_args += " -map " + ff_map_file;
-			run("techmap " + techmap_args);
+				techmap_args += stringf("[-map %s]", ff_map_file.c_str());
+			else if (!abc9)
+				techmap_args += stringf(" -map %s", ff_map_file.c_str());
+			run("techmap " + techmap_args, "(only if '-abc9')");
 			run("xilinx_dffopt");
-			run("clean");
 		}
 
 		if (check_label("finalize")) {
@@ -582,6 +598,7 @@ struct SynthXilinxPass : public ScriptPass
 				run("clkbufmap -buf BUFG O:I ", "(skip if '-noclkbuf')");
 			if (help_mode || ise)
 				run("extractinv -inv INV O:I", "(only if '-ise')");
+			run("clean");
 		}
 
 		if (check_label("check")) {
diff --git a/tests/arch/anlogic/counter.ys b/tests/arch/anlogic/counter.ys
index d363ec24e..a6eab248c 100644
--- a/tests/arch/anlogic/counter.ys
+++ b/tests/arch/anlogic/counter.ys
@@ -2,7 +2,7 @@ read_verilog ../common/counter.v
 hierarchy -top top
 proc
 flatten
-equiv_opt -map +/anlogic/cells_sim.v synth_anlogic # equivalency check
+equiv_opt -assert -multiclock -map +/anlogic/cells_sim.v synth_anlogic # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 
diff --git a/tests/arch/ecp5/bug1598.ys b/tests/arch/ecp5/bug1598.ys
new file mode 100644
index 000000000..1d1682fcd
--- /dev/null
+++ b/tests/arch/ecp5/bug1598.ys
@@ -0,0 +1,16 @@
+read_verilog <<EOT
+module led_blink (
+        input clk,
+        output ledc
+    );
+ 
+    reg [6:0] led_counter = 0;
+    always @( posedge clk ) begin
+            led_counter <= led_counter + 1;
+    end
+    assign ledc = !led_counter[ 6:3 ];
+ 
+endmodule
+EOT
+proc
+equiv_opt -assert -map +/ecp5/cells_sim.v synth_ecp5 -abc9
diff --git a/tests/arch/ecp5/counter.ys b/tests/arch/ecp5/counter.ys
index f9f60fbff..e46001ffe 100644
--- a/tests/arch/ecp5/counter.ys
+++ b/tests/arch/ecp5/counter.ys
@@ -2,7 +2,7 @@ read_verilog ../common/counter.v
 hierarchy -top top
 proc
 flatten
-equiv_opt -map +/ecp5/cells_sim.v synth_ecp5 # equivalency check
+equiv_opt -assert -multiclock -map +/ecp5/cells_sim.v synth_ecp5 # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 select -assert-count 4 t:CCU2C
diff --git a/tests/arch/ecp5/macc.ys b/tests/arch/ecp5/macc.ys
index 1863ea4d2..8da8d2f8e 100644
--- a/tests/arch/ecp5/macc.ys
+++ b/tests/arch/ecp5/macc.ys
@@ -3,8 +3,8 @@ hierarchy -top top
 proc
 # Blocked by issue #1358 (Missing ECP5 simulation models)
 #equiv_opt -assert -map +/ecp5/cells_sim.v synth_ecp5 # equivalency check
-equiv_opt -map +/ecp5/cells_sim.v synth_ecp5 # equivalency check
-design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
+synth_ecp5
+#design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 select -assert-count 1 t:MULT18X18D
 select -assert-count 4 t:CCU2C
diff --git a/tests/arch/ecp5/mul.ys b/tests/arch/ecp5/mul.ys
index 2105be52c..f887e9585 100644
--- a/tests/arch/ecp5/mul.ys
+++ b/tests/arch/ecp5/mul.ys
@@ -3,9 +3,9 @@ hierarchy -top top
 proc
 # Blocked by issue #1358 (Missing ECP5 simulation models)
 #equiv_opt -assert -map +/ecp5/cells_sim.v synth_ecp5 # equivalency check
-equiv_opt -map +/ecp5/cells_sim.v synth_ecp5 # equivalency check
+synth_ecp5
 
-design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
+#design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 select -assert-count 1 t:MULT18X18D
 select -assert-none t:MULT18X18D %% t:* %D
diff --git a/tests/arch/ecp5/mux.ys b/tests/arch/ecp5/mux.ys
index 92463aa32..22866832d 100644
--- a/tests/arch/ecp5/mux.ys
+++ b/tests/arch/ecp5/mux.ys
@@ -39,8 +39,8 @@ proc
 equiv_opt -assert -map +/ecp5/cells_sim.v synth_ecp5 # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd mux16 # Constrain all select calls below inside the top module
-select -assert-count 8 t:L6MUX21
-select -assert-count 26 t:LUT4
-select -assert-count 12 t:PFUMX
+select -assert-count 12 t:L6MUX21
+select -assert-count 34 t:LUT4
+select -assert-count 17 t:PFUMX
 
 select -assert-none t:LUT4 t:L6MUX21 t:PFUMX %% t:* %D
diff --git a/tests/arch/efinix/counter.ys b/tests/arch/efinix/counter.ys
index d20b8ae27..f8fb29a87 100644
--- a/tests/arch/efinix/counter.ys
+++ b/tests/arch/efinix/counter.ys
@@ -2,7 +2,7 @@ read_verilog ../common/counter.v
 hierarchy -top top
 proc
 flatten
-equiv_opt -map +/efinix/cells_sim.v synth_efinix # equivalency check
+equiv_opt -assert -multiclock -map +/efinix/cells_sim.v synth_efinix # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 
diff --git a/tests/arch/gowin/counter.ys b/tests/arch/gowin/counter.ys
index 920479d44..bdbc7ee24 100644
--- a/tests/arch/gowin/counter.ys
+++ b/tests/arch/gowin/counter.ys
@@ -2,7 +2,7 @@ read_verilog ../common/counter.v
 hierarchy -top top
 proc
 flatten
-equiv_opt -map +/gowin/cells_sim.v synth_gowin # equivalency check
+equiv_opt -assert -multiclock -map +/gowin/cells_sim.v synth_gowin # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 
diff --git a/tests/arch/ice40/bug1598.ys b/tests/arch/ice40/bug1598.ys
new file mode 100644
index 000000000..8438cb979
--- /dev/null
+++ b/tests/arch/ice40/bug1598.ys
@@ -0,0 +1,16 @@
+read_verilog <<EOT
+module led_blink (
+        input clk,
+        output ledc
+    );
+ 
+    reg [6:0] led_counter = 0;
+    always @( posedge clk ) begin
+            led_counter <= led_counter + 1;
+    end
+    assign ledc = !led_counter[ 6:3 ];
+ 
+endmodule
+EOT
+proc
+equiv_opt -assert -map +/ice40/cells_sim.v synth_ice40 -abc9
diff --git a/tests/arch/ice40/counter.ys b/tests/arch/ice40/counter.ys
index f112eb97d..7bbc4f2c3 100644
--- a/tests/arch/ice40/counter.ys
+++ b/tests/arch/ice40/counter.ys
@@ -2,7 +2,7 @@ read_verilog ../common/counter.v
 hierarchy -top top
 proc
 flatten
-equiv_opt -map +/ice40/cells_sim.v synth_ice40 # equivalency check
+equiv_opt -assert -multiclock -map +/ice40/cells_sim.v synth_ice40 # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 select -assert-count 6 t:SB_CARRY
diff --git a/tests/arch/ice40/mul.ys b/tests/arch/ice40/mul.ys
index 9891b77d6..b8c3eb941 100644
--- a/tests/arch/ice40/mul.ys
+++ b/tests/arch/ice40/mul.ys
@@ -1,6 +1,6 @@
 read_verilog ../common/mul.v
 hierarchy -top top
-equiv_opt -assert -map +/ice40/cells_sim.v synth_ice40 -dsp # equivalency check
+equiv_opt -assert -multiclock -map +/ice40/cells_sim.v synth_ice40 -dsp # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 select -assert-count 1 t:SB_MAC16
diff --git a/tests/arch/ice40/rom.v b/tests/arch/ice40/rom.v
index 0a0f41f37..71459fe38 100644
--- a/tests/arch/ice40/rom.v
+++ b/tests/arch/ice40/rom.v
@@ -2,7 +2,8 @@
 Example from: https://www.latticesemi.com/-/media/LatticeSemi/Documents/UserManuals/EI/iCEcube201701UserGuide.ashx?document_id=52071 [p. 74].
 */
 module top(data, addr);
-output [3:0] data;
+output [3:0] data; // Note: this prompts a Yosys warning, but
+                   //       vendor doc does not contain 'reg'
 input [4:0] addr;
 always @(addr) begin
 case (addr)
diff --git a/tests/arch/xilinx/abc9_dff.ys b/tests/arch/xilinx/abc9_dff.ys
new file mode 100644
index 000000000..b457cefce
--- /dev/null
+++ b/tests/arch/xilinx/abc9_dff.ys
@@ -0,0 +1,32 @@
+read_verilog <<EOT
+module top(input C, D, output [7:0] Q);
+FDRE   fd1(.C(C), .CE(1'b1), .D(D), .R(1'b1), .Q(Q[0]));
+FDSE   fd2(.C(C), .CE(1'b1), .D(D), .S(1'b1), .Q(Q[1]));
+FDCE   fd3(.C(C), .CE(1'b1), .D(D), .CLR(1'b1), .Q(Q[2]));
+FDPE   fd4(.C(C), .CE(1'b1), .D(D), .PRE(1'b1), .Q(Q[3]));
+FDRE_1 fd5(.C(C), .CE(1'b1), .D(D), .R(1'b1), .Q(Q[4]));
+FDSE_1 fd6(.C(C), .CE(1'b1), .D(D), .S(1'b1), .Q(Q[5]));
+FDCE_1 fd7(.C(C), .CE(1'b1), .D(D), .CLR(1'b1), .Q(Q[6]));
+FDPE_1 fd8(.C(C), .CE(1'b1), .D(D), .PRE(1'b1), .Q(Q[7]));
+endmodule
+EOT
+equiv_opt -assert -multiclock -map +/xilinx/cells_sim.v synth_xilinx -abc9 -dff -noiopad -noclkbuf
+design -load postopt
+select -assert-none t:FD*
+
+design -reset
+read_verilog <<EOT
+module top(input C, D, output [7:0] Q);
+FDRE   fd1(.C(C), .CE(1'b0), .D(D), .R(1'b0), .Q(Q[0]));
+FDSE   fd2(.C(C), .CE(1'b0), .D(D), .S(1'b0), .Q(Q[1]));
+FDCE   fd3(.C(C), .CE(1'b0), .D(D), .CLR(1'b0), .Q(Q[2]));
+FDPE   fd4(.C(C), .CE(1'b0), .D(D), .PRE(1'b0), .Q(Q[3]));
+FDRE_1 fd5(.C(C), .CE(1'b0), .D(D), .R(1'b0), .Q(Q[4]));
+FDSE_1 fd6(.C(C), .CE(1'b0), .D(D), .S(1'b0), .Q(Q[5]));
+FDCE_1 fd7(.C(C), .CE(1'b0), .D(D), .CLR(1'b0), .Q(Q[6]));
+FDPE_1 fd8(.C(C), .CE(1'b0), .D(D), .PRE(1'b0), .Q(Q[7]));
+endmodule
+EOT
+equiv_opt -assert -multiclock -map +/xilinx/cells_sim.v synth_xilinx -abc9 -dff -noiopad -noclkbuf
+design -load postopt
+select -assert-none t:FD*
diff --git a/tests/arch/xilinx/abc9_map.ys b/tests/arch/xilinx/abc9_map.ys
new file mode 100644
index 000000000..4a7b9384a
--- /dev/null
+++ b/tests/arch/xilinx/abc9_map.ys
@@ -0,0 +1,91 @@
+read_verilog <<EOT
+module top(input C, CE, D, R, output [1:0] Q);
+FDRE   #(.INIT(1'b1)) ff1 (.C(C), .CE(CE), .D(D), .R(R), .Q(Q[0]));
+FDRE_1 #(.INIT(1'b1)) ff2 (.C(C), .CE(CE), .D(D), .R(R), .Q(Q[1]));
+endmodule
+EOT
+design -save gold
+
+techmap -map +/xilinx/abc9_map.v -max_iter 1 -D DFF_MODE
+techmap -map +/xilinx/abc9_unmap.v
+select -assert-count 1 t:FDSE
+select -assert-count 1 t:FDSE_1
+techmap -autoproc -map +/xilinx/cells_sim.v
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+techmap -autoproc -map +/xilinx/cells_sim.v
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -seq 2 -verify -prove-asserts -show-ports miter
+
+design -reset
+read_verilog <<EOT
+module top(input C, CE, D, S, output [1:0] Q);
+FDSE   #(.INIT(1'b1)) ff1 (.C(C), .CE(CE), .D(D), .S(S), .Q(Q[0]));
+FDSE_1 #(.INIT(1'b1)) ff2 (.C(C), .CE(CE), .D(D), .S(S), .Q(Q[1]));
+endmodule
+EOT
+design -save gold
+
+techmap -map +/xilinx/abc9_map.v -max_iter 1 -D DFF_MODE
+techmap -map +/xilinx/abc9_unmap.v
+select -assert-count 1 t:FDRE
+select -assert-count 1 t:FDRE_1
+techmap -autoproc -map +/xilinx/cells_sim.v
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+techmap -autoproc -map +/xilinx/cells_sim.v
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -seq 2 -set-init-zero -verify -prove-asserts -show-ports miter
+
+design -reset
+read_verilog <<EOT
+module top(input C, CE, D, PRE, output [1:0] Q);
+FDPE   #(.INIT(1'b1)) ff1 (.C(C), .CE(CE), .D(D), .PRE(PRE), .Q(Q[0]));
+FDPE_1 #(.INIT(1'b1)) ff2 (.C(C), .CE(CE), .D(D), .PRE(PRE), .Q(Q[1]));
+endmodule
+EOT
+design -save gold
+
+techmap -map +/xilinx/abc9_map.v -max_iter 1 -D DFF_MODE
+techmap -map +/xilinx/abc9_unmap.v
+select -assert-count 1 t:FDCE
+select -assert-count 1 t:FDCE_1
+techmap -autoproc -map +/xilinx/cells_sim.v
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+techmap -autoproc -map +/xilinx/cells_sim.v
+clk2fflogic
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -seq 2 -set-init-zero -verify -prove-asserts -show-ports miter
+
+design -reset
+read_verilog <<EOT
+module top(input C, CE, D, CLR, output [1:0] Q);
+FDCE   #(.INIT(1'b1)) ff1 (.C(C), .CE(CE), .D(D), .CLR(CLR), .Q(Q[0]));
+FDCE_1 #(.INIT(1'b1)) ff2 (.C(C), .CE(CE), .D(D), .CLR(CLR), .Q(Q[1]));
+endmodule
+EOT
+design -save gold
+
+techmap -map +/xilinx/abc9_map.v -max_iter 1 -D DFF_MODE
+techmap -map +/xilinx/abc9_unmap.v
+select -assert-count 1 t:FDPE
+techmap -autoproc -map +/xilinx/cells_sim.v
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+techmap -autoproc -map +/xilinx/cells_sim.v
+clk2fflogic
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -seq 2 -set-init-zero -verify -prove-asserts -show-ports miter
diff --git a/tests/arch/xilinx/add_sub.ys b/tests/arch/xilinx/add_sub.ys
index 9dbddce47..313948cc5 100644
--- a/tests/arch/xilinx/add_sub.ys
+++ b/tests/arch/xilinx/add_sub.ys
@@ -1,7 +1,7 @@
 read_verilog ../common/add_sub.v
 hierarchy -top top
 proc
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 select -assert-count 14 t:LUT2
diff --git a/tests/arch/xilinx/adffs.ys b/tests/arch/xilinx/adffs.ys
index c0ff6a2e2..3328f9edc 100644
--- a/tests/arch/xilinx/adffs.ys
+++ b/tests/arch/xilinx/adffs.ys
@@ -3,7 +3,7 @@ design -save read
 
 hierarchy -top adff
 proc
-equiv_opt -async2sync  -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -async2sync  -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd adff # Constrain all select calls below inside the top module
 select -assert-count 1 t:BUFG
@@ -15,7 +15,7 @@ select -assert-none t:BUFG t:FDCE %% t:* %D
 design -load read
 hierarchy -top adffn
 proc
-equiv_opt -async2sync  -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -async2sync  -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd adffn # Constrain all select calls below inside the top module
 select -assert-count 1 t:BUFG
@@ -28,7 +28,7 @@ select -assert-none t:BUFG t:FDCE t:INV %% t:* %D
 design -load read
 hierarchy -top dffs
 proc
-equiv_opt -async2sync  -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -async2sync  -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd dffs # Constrain all select calls below inside the top module
 select -assert-count 1 t:BUFG
@@ -40,7 +40,7 @@ select -assert-none t:BUFG t:FDSE %% t:* %D
 design -load read
 hierarchy -top ndffnr
 proc
-equiv_opt -async2sync  -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -async2sync  -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd ndffnr # Constrain all select calls below inside the top module
 select -assert-count 1 t:BUFG
diff --git a/tests/arch/xilinx/attributes_test.ys b/tests/arch/xilinx/attributes_test.ys
index 4c881b280..7bdd94a63 100644
--- a/tests/arch/xilinx/attributes_test.ys
+++ b/tests/arch/xilinx/attributes_test.ys
@@ -1,7 +1,7 @@
 # Check that blockram memory without parameters is not modified
 read_verilog ../common/memory_attributes/attributes_test.v
 hierarchy -top block_ram
-synth_xilinx -top block_ram
+synth_xilinx -top block_ram -noiopad
 cd block_ram # Constrain all select calls below inside the top module
 select -assert-count 1 t:RAMB18E1
  
@@ -9,7 +9,7 @@ select -assert-count 1 t:RAMB18E1
 design -reset
 read_verilog ../common/memory_attributes/attributes_test.v
 hierarchy -top distributed_ram
-synth_xilinx -top distributed_ram
+synth_xilinx -top distributed_ram -noiopad
 cd distributed_ram # Constrain all select calls below inside the top module
 select -assert-count 8 t:RAM32X1D
  
@@ -18,7 +18,7 @@ design -reset
 read_verilog ../common/memory_attributes/attributes_test.v
 prep
 setattr -mod -set ram_style "distributed" block_ram
-synth_xilinx -top block_ram
+synth_xilinx -top block_ram -noiopad
 cd block_ram # Constrain all select calls below inside the top module
 select -assert-count 32 t:RAM128X1D
  
@@ -27,7 +27,7 @@ design -reset
 read_verilog ../common/memory_attributes/attributes_test.v
 prep
 setattr -mod -set logic_block 1 block_ram
-synth_xilinx -top block_ram
+synth_xilinx -top block_ram -noiopad
 cd block_ram # Constrain all select calls below inside the top module
 select -assert-count 0 t:RAMB18E1
 select -assert-count 32 t:RAM128X1D
@@ -35,13 +35,13 @@ select -assert-count 32 t:RAM128X1D
 # Set ram_style block to a distributed memory; will be implemented as blockram
 design -reset
 read_verilog ../common/memory_attributes/attributes_test.v
-synth_xilinx -top distributed_ram_manual
+synth_xilinx -top distributed_ram_manual -noiopad
 cd distributed_ram_manual # Constrain all select calls below inside the top module
 select -assert-count 1 t:RAMB18E1
  
 # Set synthesis, ram_block block to a distributed memory; will be implemented as blockram
 design -reset
 read_verilog ../common/memory_attributes/attributes_test.v
-synth_xilinx -top distributed_ram_manual_syn
+synth_xilinx -top distributed_ram_manual_syn -noiopad
 cd distributed_ram_manual_syn # Constrain all select calls below inside the top module
 select -assert-count 1 t:RAMB18E1
diff --git a/tests/arch/xilinx/blockram.ys b/tests/arch/xilinx/blockram.ys
index bb908cbbf..ed743cf44 100644
--- a/tests/arch/xilinx/blockram.ys
+++ b/tests/arch/xilinx/blockram.ys
@@ -3,28 +3,28 @@
 # Memory bits <= 18K; Data width <= 36; Address width <= 14: -> RAMB18E1
 read_verilog ../common/blockram.v
 chparam -set ADDRESS_WIDTH 10 -set DATA_WIDTH 1 sync_ram_sdp
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 1 t:RAMB18E1
 
 design -reset
 read_verilog ../common/blockram.v
 chparam -set ADDRESS_WIDTH 8 -set DATA_WIDTH 18 sync_ram_sdp
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 1 t:RAMB18E1
 
 design -reset
 read_verilog ../common/blockram.v
 chparam -set ADDRESS_WIDTH 14 -set DATA_WIDTH 1 sync_ram_sdp
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 1 t:RAMB18E1
 
 design -reset
 read_verilog ../common/blockram.v
 chparam -set ADDRESS_WIDTH 9 -set DATA_WIDTH 36 sync_ram_sdp
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 1 t:RAMB18E1
 
@@ -32,7 +32,7 @@ select -assert-count 1 t:RAMB18E1
 design -reset
 read_verilog ../common/blockram.v
 chparam -set ADDRESS_WIDTH 8 -set DATA_WIDTH 2 sync_ram_sdp
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 0 t:RAMB18E1
 select -assert-count 4 t:RAM128X1D
@@ -41,7 +41,7 @@ select -assert-count 4 t:RAM128X1D
 design -reset
 read_verilog ../common/blockram.v
 chparam -set ADDRESS_WIDTH 10 -set DATA_WIDTH 36 sync_ram_sdp
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 1 t:RAMB36E1
 
@@ -52,7 +52,7 @@ design -reset
 read_verilog ../common/blockram.v
 hierarchy -top sync_ram_sdp -chparam ADDRESS_WIDTH 10 -chparam DATA_WIDTH 1 
 setattr -set ram_style "block" m:memory
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 1 t:RAMB18E1
 
@@ -60,7 +60,7 @@ design -reset
 read_verilog ../common/blockram.v
 hierarchy -top sync_ram_sdp -chparam ADDRESS_WIDTH 10 -chparam DATA_WIDTH 1 
 setattr -set ram_block 1 m:memory
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 1 t:RAMB18E1
 
@@ -68,7 +68,7 @@ design -reset
 read_verilog ../common/blockram.v
 hierarchy -top sync_ram_sdp -chparam ADDRESS_WIDTH 10 -chparam DATA_WIDTH 1 
 setattr -set ram_style "dont_infer_a_ram_pretty_please" m:memory
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 0 t:RAMB18E1
 
@@ -76,7 +76,7 @@ design -reset
 read_verilog ../common/blockram.v
 hierarchy -top sync_ram_sdp -chparam ADDRESS_WIDTH 10 -chparam DATA_WIDTH 1 
 setattr -set logic_block 1 m:memory
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 0 t:RAMB18E1
 
@@ -84,7 +84,7 @@ design -reset
 read_verilog ../common/blockram.v
 hierarchy -top sync_ram_sdp -chparam ADDRESS_WIDTH 8 -chparam DATA_WIDTH 1
 setattr -set ram_style "block" m:memory
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 1 t:RAMB18E1
 
@@ -92,6 +92,6 @@ design -reset
 read_verilog ../common/blockram.v
 hierarchy -top sync_ram_sdp -chparam ADDRESS_WIDTH 8 -chparam DATA_WIDTH 1
 setattr -set ram_block 1 m:memory
-synth_xilinx -top sync_ram_sdp
+synth_xilinx -top sync_ram_sdp -noiopad
 cd sync_ram_sdp
 select -assert-count 1 t:RAMB18E1
diff --git a/tests/arch/xilinx/bug1460.ys b/tests/arch/xilinx/bug1460.ys
index 2018071cc..09935ccd8 100644
--- a/tests/arch/xilinx/bug1460.ys
+++ b/tests/arch/xilinx/bug1460.ys
@@ -28,7 +28,7 @@ module register_file(
 endmodule
 EOT
 
-synth_xilinx
+synth_xilinx -noiopad
 cd register_file
 select -assert-count 32 t:RAM32M
 select -assert-none t:* t:BUFG %d t:RAM32M %d
diff --git a/tests/arch/xilinx/bug1598.ys b/tests/arch/xilinx/bug1598.ys
new file mode 100644
index 000000000..1175380b1
--- /dev/null
+++ b/tests/arch/xilinx/bug1598.ys
@@ -0,0 +1,16 @@
+read_verilog <<EOT
+module led_blink (
+        input clk,
+        output ledc
+    );
+ 
+    reg [6:0] led_counter = 0;
+    always @( posedge clk ) begin
+            led_counter <= led_counter + 1;
+    end
+    assign ledc = !led_counter[ 6:3 ];
+ 
+endmodule
+EOT
+proc
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -abc9
diff --git a/tests/arch/xilinx/bug1605.ys b/tests/arch/xilinx/bug1605.ys
new file mode 100644
index 000000000..4be659860
--- /dev/null
+++ b/tests/arch/xilinx/bug1605.ys
@@ -0,0 +1,19 @@
+read_verilog <<EOT
+module top(inout io);
+    wire in;
+    wire t;
+    wire o;
+
+    IOBUF IOBUF(
+      .I(in),
+      .T(t),
+      .IO(io),
+      .O(o)
+    );
+endmodule
+EOT
+
+synth_xilinx
+cd top
+select -assert-count 1 t:IOBUF
+select -assert-none t:* t:IOBUF %d
diff --git a/tests/arch/xilinx/counter.ys b/tests/arch/xilinx/counter.ys
index 604acdbfc..11c29922e 100644
--- a/tests/arch/xilinx/counter.ys
+++ b/tests/arch/xilinx/counter.ys
@@ -2,7 +2,7 @@ read_verilog ../common/counter.v
 hierarchy -top top
 proc
 flatten
-equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 
diff --git a/tests/arch/xilinx/dffs.ys b/tests/arch/xilinx/dffs.ys
index 0bba4858f..dc764b033 100644
--- a/tests/arch/xilinx/dffs.ys
+++ b/tests/arch/xilinx/dffs.ys
@@ -3,7 +3,7 @@ design -save read
 
 hierarchy -top dff
 proc
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd dff # Constrain all select calls below inside the top module
 select -assert-count 1 t:BUFG
@@ -15,7 +15,7 @@ select -assert-none t:BUFG t:FDRE %% t:* %D
 design -load read
 hierarchy -top dffe
 proc
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd dffe # Constrain all select calls below inside the top module
 select -assert-count 1 t:BUFG
diff --git a/tests/arch/xilinx/dsp_cascade.ys b/tests/arch/xilinx/dsp_cascade.ys
index f9185551b..ca6b619b9 100644
--- a/tests/arch/xilinx/dsp_cascade.ys
+++ b/tests/arch/xilinx/dsp_cascade.ys
@@ -19,7 +19,7 @@ EOT
 proc
 design -save read
 
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 design -load postopt
 cd cascade
 select -assert-count 3 t:DSP48E1
@@ -35,7 +35,7 @@ select -assert-none t:DSP48E1 t:BUFG %% t:* %D
 select -assert-count 2 t:DSP48E1 %co:+[PCOUT] t:DSP48E1 %d %co:+[PCIN] w:* %d t:DSP48E1 %i
 
 design -load read
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -family xc6s
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -family xc6s -noiopad
 design -load postopt
 cd cascade
 select -assert-count 3 t:DSP48A1
@@ -65,7 +65,7 @@ EOT
 proc
 design -save read
 
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 design -load postopt
 cd cascade
 select -assert-count 2 t:DSP48E1
@@ -75,7 +75,7 @@ select -assert-none t:DSP48E1 t:BUFG %% t:* %D
 select -assert-count 1 t:DSP48E1 %co:+[PCOUT] t:DSP48E1 %d %co:+[PCIN] w:* %d t:DSP48E1 %i
 
 design -load read
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -family xc6s
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -family xc6s -noiopad
 design -load postopt
 cd cascade
 select -assert-count 2 t:DSP48A1
diff --git a/tests/arch/xilinx/dsp_fastfir.ys b/tests/arch/xilinx/dsp_fastfir.ys
index 0067a822b..57fe49bde 100644
--- a/tests/arch/xilinx/dsp_fastfir.ys
+++ b/tests/arch/xilinx/dsp_fastfir.ys
@@ -63,7 +63,7 @@ module fastfir_dynamictaps(i_clk, i_reset, i_tap_wr, i_tap, i_ce, i_sample, o_re
 endmodule
 EOT
 
-synth_xilinx
+synth_xilinx -noiopad
 cd fastfir_dynamictaps
 select -assert-count 2 t:DSP48E1
 select -assert-none t:* t:DSP48E1 %d t:BUFG %d
diff --git a/tests/arch/xilinx/fsm.ys b/tests/arch/xilinx/fsm.ys
index f03400fe7..3235d5af3 100644
--- a/tests/arch/xilinx/fsm.ys
+++ b/tests/arch/xilinx/fsm.ys
@@ -3,7 +3,7 @@ hierarchy -top fsm
 proc
 flatten
 
-equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx
+equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 miter -equiv -make_assert -flatten gold gate miter
 sat -verify -prove-asserts -show-public -set-at 1 in_reset 1 -seq 20 -prove-skip 1 miter
 
diff --git a/tests/arch/xilinx/latches.ys b/tests/arch/xilinx/latches.ys
index c87a8e38b..e226c2ec8 100644
--- a/tests/arch/xilinx/latches.ys
+++ b/tests/arch/xilinx/latches.ys
@@ -3,7 +3,7 @@ design -save read
 
 hierarchy -top latchp
 proc
-equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd latchp # Constrain all select calls below inside the top module
 select -assert-count 1 t:LDCE
@@ -14,7 +14,7 @@ select -assert-none t:LDCE %% t:* %D
 design -load read
 hierarchy -top latchn
 proc
-equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd latchn # Constrain all select calls below inside the top module
 select -assert-count 1 t:LDCE
@@ -26,7 +26,7 @@ select -assert-none t:LDCE t:INV %% t:* %D
 design -load read
 hierarchy -top latchsr
 proc
-equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd latchsr # Constrain all select calls below inside the top module
 select -assert-count 1 t:LDCE
diff --git a/tests/arch/xilinx/logic.ys b/tests/arch/xilinx/logic.ys
index d5b5c1a37..61a9314cc 100644
--- a/tests/arch/xilinx/logic.ys
+++ b/tests/arch/xilinx/logic.ys
@@ -1,7 +1,7 @@
 read_verilog ../common/logic.v
 hierarchy -top top
 proc
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 
diff --git a/tests/arch/xilinx/lutram.ys b/tests/arch/xilinx/lutram.ys
index 6c9d1eae1..3f127a77e 100644
--- a/tests/arch/xilinx/lutram.ys
+++ b/tests/arch/xilinx/lutram.ys
@@ -2,7 +2,7 @@
 #hierarchy -top lutram_1w1r -chparam A_WIDTH 4
 #proc
 #memory -nomap
-#equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx
+#equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 #memory
 #opt -full
 #
@@ -22,7 +22,7 @@ read_verilog ../common/lutram.v
 hierarchy -top lutram_1w1r -chparam A_WIDTH 5
 proc
 memory -nomap
-equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx
+equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 memory
 opt -full
 
@@ -42,7 +42,7 @@ read_verilog ../common/lutram.v
 hierarchy -top lutram_1w1r
 proc
 memory -nomap
-equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx
+equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 memory
 opt -full
 
@@ -62,7 +62,7 @@ read_verilog ../common/lutram.v
 hierarchy -top lutram_1w3r
 proc
 memory -nomap
-equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx
+equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 memory
 opt -full
 
@@ -82,7 +82,7 @@ read_verilog ../common/lutram.v
 hierarchy -top lutram_1w3r -chparam A_WIDTH 6
 proc
 memory -nomap
-equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx
+equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 memory
 opt -full
 
@@ -102,7 +102,7 @@ read_verilog ../common/lutram.v
 hierarchy -top lutram_1w1r -chparam A_WIDTH 5 -chparam D_WIDTH 6
 proc
 memory -nomap
-equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx
+equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 memory
 opt -full
 
@@ -122,7 +122,7 @@ read_verilog ../common/lutram.v
 hierarchy -top lutram_1w1r -chparam A_WIDTH 6 -chparam D_WIDTH 6
 proc
 memory -nomap
-equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx
+equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 memory
 opt -full
 
diff --git a/tests/arch/xilinx/macc.ys b/tests/arch/xilinx/macc.ys
index 11e959976..bf2b36320 100644
--- a/tests/arch/xilinx/macc.ys
+++ b/tests/arch/xilinx/macc.ys
@@ -3,8 +3,8 @@ design -save read
 
 hierarchy -top macc
 proc
-#equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx ### TODO
-equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx
+#equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad ### TODO
+equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 miter -equiv -flatten -make_assert -make_outputs gold gate miter
 sat -verify -prove-asserts -seq 10 -show-inputs -show-outputs miter
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
@@ -17,8 +17,8 @@ select -assert-none t:BUFG t:FDRE t:DSP48E1 %% t:* %D
 design -load read
 hierarchy -top macc2
 proc
-#equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx ### TODO
-equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx
+#equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad ### TODO
+equiv_opt -run :prove -map +/xilinx/cells_sim.v synth_xilinx -noiopad
 miter -equiv -flatten -make_assert -make_outputs gold gate miter
 sat -verify -prove-asserts -seq 10 -show-inputs -show-outputs miter
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
diff --git a/tests/arch/xilinx/mul.ys b/tests/arch/xilinx/mul.ys
index 6cf994fbf..490846ff1 100644
--- a/tests/arch/xilinx/mul.ys
+++ b/tests/arch/xilinx/mul.ys
@@ -1,7 +1,7 @@
 read_verilog ../common/mul.v
 hierarchy -top top
 proc
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 
@@ -13,7 +13,7 @@ design -reset
 read_verilog ../common/mul.v
 hierarchy -top top
 proc
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -family xc6s # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -family xc6s -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 
diff --git a/tests/arch/xilinx/mul_unsigned.ys b/tests/arch/xilinx/mul_unsigned.ys
index c714680af..980263cbd 100644
--- a/tests/arch/xilinx/mul_unsigned.ys
+++ b/tests/arch/xilinx/mul_unsigned.ys
@@ -2,7 +2,7 @@ read_verilog mul_unsigned.v
 hierarchy -top mul_unsigned
 proc
 
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd mul_unsigned # Constrain all select calls below inside the top module
 select -assert-count 1 t:BUFG
@@ -16,7 +16,7 @@ read_verilog mul_unsigned.v
 hierarchy -top mul_unsigned
 proc
 
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -family xc6s # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -family xc6s -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd mul_unsigned # Constrain all select calls below inside the top module
 select -assert-count 1 t:BUFG
diff --git a/tests/arch/xilinx/mux.ys b/tests/arch/xilinx/mux.ys
index 388272449..99817738d 100644
--- a/tests/arch/xilinx/mux.ys
+++ b/tests/arch/xilinx/mux.ys
@@ -3,7 +3,7 @@ design -save read
 
 hierarchy -top mux2
 proc
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd mux2 # Constrain all select calls below inside the top module
 select -assert-count 1 t:LUT3
@@ -14,7 +14,7 @@ select -assert-none t:LUT3 %% t:* %D
 design -load read
 hierarchy -top mux4
 proc
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd mux4 # Constrain all select calls below inside the top module
 select -assert-count 1 t:LUT6
@@ -25,7 +25,7 @@ select -assert-none t:LUT6 %% t:* %D
 design -load read
 hierarchy -top mux8
 proc
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd mux8 # Constrain all select calls below inside the top module
 select -assert-count 1 t:LUT3
@@ -37,7 +37,7 @@ select -assert-none t:LUT3 t:LUT6 %% t:* %D
 design -load read
 hierarchy -top mux16
 proc
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd mux16 # Constrain all select calls below inside the top module
 select -assert-min 5 t:LUT6
diff --git a/tests/arch/xilinx/shifter.ys b/tests/arch/xilinx/shifter.ys
index 455437f18..3652319a0 100644
--- a/tests/arch/xilinx/shifter.ys
+++ b/tests/arch/xilinx/shifter.ys
@@ -2,7 +2,7 @@ read_verilog ../common/shifter.v
 hierarchy -top top
 proc
 flatten
-equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd top # Constrain all select calls below inside the top module
 
diff --git a/tests/arch/xilinx/tribuf.ys b/tests/arch/xilinx/tribuf.ys
index 4697703ca..eaccab126 100644
--- a/tests/arch/xilinx/tribuf.ys
+++ b/tests/arch/xilinx/tribuf.ys
@@ -7,6 +7,7 @@ synth
 equiv_opt -assert -map +/xilinx/cells_sim.v -map +/simcells.v synth_xilinx # equivalency check
 design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
 cd tristate # Constrain all select calls below inside the top module
-# TODO :: Tristate logic not yet supported; see https://github.com/YosysHQ/yosys/issues/1225
-select -assert-count 1 t:$_TBUF_
-select -assert-none t:$_TBUF_ %% t:* %D
+select -assert-count 2 t:IBUF
+select -assert-count 1 t:INV
+select -assert-count 1 t:OBUFT
+select -assert-none t:IBUF t:INV t:OBUFT %% t:* %D
diff --git a/tests/simple_abc9/abc9.v b/tests/simple_abc9/abc9.v
index de60619d1..8afd0ce96 100644
--- a/tests/simple_abc9/abc9.v
+++ b/tests/simple_abc9/abc9.v
@@ -264,3 +264,30 @@ always @*
   if (en)
     q <= d;
 endmodule
+
+module abc9_test031(input clk1, clk2, d, output reg q1, q2);
+always @(posedge clk1) q1 <= d;
+always @(negedge clk2) q2 <= q1;
+endmodule
+
+module abc9_test032(input clk, d, r, output reg q);
+always @(posedge clk or posedge r)
+    if (r) q <= 1'b0;
+    else q <= d;
+endmodule
+
+module abc9_test033(input clk, d, r, output reg q);
+always @(negedge clk or posedge r)
+    if (r) q <= 1'b1;
+    else q <= d;
+endmodule
+
+module abc9_test034(input clk, d, output reg q1, q2);
+always @(posedge clk) q1 <= d;
+always @(posedge clk) q2 <= q1;
+endmodule
+
+module abc9_test035(input clk, d, output reg [1:0] q);
+always @(posedge clk) q[0] <= d;
+always @(negedge clk) q[1] <= q[0];
+endmodule
diff --git a/tests/simple_abc9/run-test.sh b/tests/simple_abc9/run-test.sh
index 0d4262005..bc921daa9 100755
--- a/tests/simple_abc9/run-test.sh
+++ b/tests/simple_abc9/run-test.sh
@@ -20,10 +20,12 @@ fi
 cp ../simple/*.v .
 cp ../simple/*.sv .
 DOLLAR='?'
-exec ${MAKE:-make} -f ../tools/autotest.mk $seed *.v EXTRA_FLAGS="-n 300 -p '\
+exec ${MAKE:-make} -f ../tools/autotest.mk $seed *.v *.sv EXTRA_FLAGS="-n 300 -p '\
     hierarchy; \
     synth -run coarse; \
     opt -full; \
-    techmap; abc9 -lut 4 -box ../abc.box; \
+    techmap; \
+    abc9 -lut 4 -box ../abc.box; \
+    clean; \
     check -assert; \
     select -assert-none t:${DOLLAR}_NOT_ t:${DOLLAR}_AND_ %%'"
diff --git a/tests/various/abc9.v b/tests/various/abc9.v
index 30ebd4e26..f0b3f6837 100644
--- a/tests/various/abc9.v
+++ b/tests/various/abc9.v
@@ -9,3 +9,10 @@ wire w;
 unknown u(~i, w);
 unknown2 u2(w, o);
 endmodule
+
+module abc9_test032(input clk, d, r, output reg q);
+initial q = 1'b0;
+always @(negedge clk or negedge r)
+    if (!r) q <= 1'b0;
+    else q <= d;
+endmodule
diff --git a/tests/various/abc9.ys b/tests/various/abc9.ys
index 5c9a4075d..81d0afd1b 100644
--- a/tests/various/abc9.ys
+++ b/tests/various/abc9.ys
@@ -22,3 +22,19 @@ abc9 -lut 4
 select -assert-count 1 t:$lut r:LUT=2'b01 r:WIDTH=1 %i %i
 select -assert-count 1 t:unknown
 select -assert-none t:$lut t:unknown %% t: %D
+
+design -load read
+hierarchy -top abc9_test032
+proc
+clk2fflogic
+design -save gold
+
+abc9 -lut 4
+check
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -seq 10 -verify -prove-asserts -show-ports miter