Fix handling of init values in "abc -dff" and "abc -clk"

passes/techmap/abc.cc

@@ -92,6 +92,7 @@ struct gate_t
 	int in1, in2, in3, in4;
 	bool is_port;
 	RTLIL::SigBit bit;
+	RTLIL::State init;
 };
 
 bool map_mux4;
@@ -104,7 +105,9 @@ SigMap assign_map;
 RTLIL::Module *module;
 std::vector<gate_t> signal_list;
 std::map<RTLIL::SigBit, int> signal_map;
+std::map<RTLIL::SigBit, RTLIL::State> signal_init;
 pool<std::string> enabled_gates;
+bool recover_init;
 
 bool clk_polarity, en_polarity;
 RTLIL::SigSpec clk_sig, en_sig;
@@ -123,6 +126,10 @@ int map_signal(RTLIL::SigBit bit, gate_type_t gate_type = G(NONE), int in1 = -1,
 		gate.in4 = -1;
 		gate.is_port = false;
 		gate.bit = bit;
+		if (signal_init.count(bit))
+			gate.init = signal_init.at(bit);
+		else
+			gate.init = State::Sx;
 		signal_list.push_back(gate);
 		signal_map[bit] = gate.id;
 	}
@@ -609,11 +616,10 @@ void abc_module(RTLIL::Design *design, RTLIL::Module *current_module, std::strin
 
 	signal_map.clear();
 	signal_list.clear();
+	recover_init = false;
 
 	if (clk_str != "$")
 	{
-		assign_map.set(module);
-
 		clk_polarity = true;
 		clk_sig = RTLIL::SigSpec();
 
@@ -849,7 +855,11 @@ void abc_module(RTLIL::Design *design, RTLIL::Module *current_module, std::strin
 			fprintf(f, "00-- 1\n");
 			fprintf(f, "--00 1\n");
 		} else if (si.type == G(FF)) {
-			fprintf(f, ".latch n%d n%d\n", si.in1, si.id);
+			if (si.init == State::S0 || si.init == State::S1) {
+				fprintf(f, ".latch n%d n%d %d\n", si.in1, si.id, si.init == State::S1 ? 1 : 0);
+				recover_init = true;
+			} else
+				fprintf(f, ".latch n%d n%d 2\n", si.in1, si.id);
 		} else if (si.type != G(NONE))
 			log_abort();
 		if (si.type != G(NONE))
@@ -1155,6 +1165,15 @@ void abc_module(RTLIL::Design *design, RTLIL::Module *current_module, std::strin
 			module->connect(conn);
 		}
 
+		if (recover_init)
+			for (auto wire : mapped_mod->wires()) {
+				if (wire->attributes.count("\\init")) {
+					Wire *w = module->wires_[remap_name(wire->name)];
+					log_assert(w->attributes.count("\\init") == 0);
+					w->attributes["\\init"] = wire->attributes.at("\\init");
+				}
+			}
+
 		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;
@@ -1372,6 +1391,7 @@ struct AbcPass : public Pass {
 		assign_map.clear();
 		signal_list.clear();
 		signal_map.clear();
+		signal_init.clear();
 
 #ifdef ABCEXTERNAL
 		std::string exe_file = ABCEXTERNAL;
@@ -1614,14 +1634,38 @@ struct AbcPass : public Pass {
 			log_cmd_error("Got -constr but no -liberty!\n");
 
 		for (auto mod : design->selected_modules())
-			if (mod->processes.size() > 0)
+		{
+			if (mod->processes.size() > 0) {
 				log("Skipping module %s as it contains processes.\n", log_id(mod));
-			else if (!dff_mode || !clk_str.empty())
+				continue;
+			}
+
+			assign_map.set(mod);
+			signal_init.clear();
+
+			for (Wire *wire : mod->wires())
+				if (wire->attributes.count("\\init")) {
+					SigSpec initsig = assign_map(wire);
+					Const initval = wire->attributes.at("\\init");
+					for (int i = 0; i < GetSize(initsig) && i < GetSize(initval); i++)
+						switch (initval[i]) {
+							case State::S0:
+								signal_init[initsig[i]] = State::S0;
+								break;
+							case State::S1:
+								signal_init[initsig[i]] = State::S0;
+								break;
+							default:
+								break;
+						}
+				}
+
+			if (!dff_mode || !clk_str.empty()) {
 				abc_module(design, mod, script_file, exe_file, liberty_file, constr_file, cleanup, lut_costs, dff_mode, clk_str, keepff,
 						delay_target, sop_inputs, sop_products, lutin_shared, fast_mode, mod->selected_cells(), show_tempdir, sop_mode);
-			else
-			{
-				assign_map.set(mod);
+				continue;
+			}
+
 			CellTypes ct(design);
 
 			std::vector<RTLIL::Cell*> all_cells = mod->selected_cells();
@@ -1771,6 +1815,7 @@ struct AbcPass : public Pass {
 		assign_map.clear();
 		signal_list.clear();
 		signal_map.clear();
+		signal_init.clear();
 
 		log_pop();
 	}