Use State::S{0,1}

backends/btor/btor.cc

@@ -616,8 +616,8 @@ struct BtorWorker
 			if (initstate_nid < 0)
 			{
 				int sid = get_bv_sid(1);
-				int one_nid = get_sig_nid(Const(1, 1));
+				int one_nid = get_sig_nid(State::S1);
-				int zero_nid = get_sig_nid(Const(0, 1));
+				int zero_nid = get_sig_nid(State::S0);
 				initstate_nid = next_nid++;
 				btorf("%d state %d\n", initstate_nid, sid);
 				btorf("%d init %d %d %d\n", next_nid++, sid, initstate_nid, one_nid);

backends/firrtl/firrtl.cc

@@ -122,9 +122,9 @@ struct FirrtlWorker
 			// Current (3/13/2019) conventions:
 			//  generate a constant 0 for clock and a constant 1 for enable if they are undefined.
 			if (!clk.is_fully_def())
-				this->clk = SigSpec(RTLIL::Const(0, 1));
+				this->clk = SigSpec(State::S0);
 			if (!ena.is_fully_def())
-				this->ena = SigSpec(RTLIL::Const(1, 1));
+				this->ena = SigSpec(State::S1);
 		}
 		string gen_read(const char * indent) {
 			string addr_expr = make_expr(addr);

backends/verilog/verilog_backend.cc

@@ -380,9 +380,9 @@ void dump_attributes(std::ostream &f, std::string indent, dict<RTLIL::IdString,
 	for (auto it = attributes.begin(); it != attributes.end(); ++it) {
 		f << stringf("%s" "%s %s", indent.c_str(), as_comment ? "/*" : "(*", id(it->first).c_str());
 		f << stringf(" = ");
-		if (modattr && (it->second == Const(0, 1) || it->second == Const(0)))
+		if (modattr && (it->second == State::S0 || it->second == Const(0)))
 			f << stringf(" 0 ");
-		else if (modattr && (it->second == Const(1, 1) || it->second == Const(1)))
+		else if (modattr && (it->second == State::S1 || it->second == Const(1)))
 			f << stringf(" 1 ");
 		else
 			dump_const(f, it->second, -1, 0, false, as_comment);

frontends/verific/verificsva.cc

@@ -357,7 +357,7 @@ struct SvaFsm
 		for (int i = 0; i < GetSize(nodes); i++)
 		{
 			if (next_state_sig[i] != State::S0) {
-				clocking.addDff(NEW_ID, next_state_sig[i], state_wire[i], Const(0, 1));
+				clocking.addDff(NEW_ID, next_state_sig[i], state_wire[i], State::S0);
 			} else {
 				module->connect(state_wire[i], State::S0);
 			}

passes/fsm/fsm_map.cc

@@ -133,7 +133,7 @@ static void implement_pattern_cache(RTLIL::Module *module, std::map<RTLIL::Const
 			cases_vector.append(and_sig);
 			break;
 		case 0:
-			cases_vector.append(RTLIL::SigSpec(1, 1));
+			cases_vector.append(State::S1);
 			break;
 		default:
 			log_abort();
@@ -150,7 +150,7 @@ static void implement_pattern_cache(RTLIL::Module *module, std::map<RTLIL::Const
 	} else if (cases_vector.size() == 1) {
 		module->connect(RTLIL::SigSig(output, cases_vector));
 	} else {
-		module->connect(RTLIL::SigSig(output, RTLIL::SigSpec(0, 1)));
+		module->connect(RTLIL::SigSig(output, State::S0));
 	}
 }
 

passes/memory/memory_collect.cc

@@ -194,8 +194,8 @@ Cell *handle_memory(Module *module, RTLIL::Memory *memory)
 	log_assert(sig_wr_en.size() == wr_ports * memory->width);
 
 	mem->parameters["\\WR_PORTS"] = Const(wr_ports);
-	mem->parameters["\\WR_CLK_ENABLE"] = wr_ports ? sig_wr_clk_enable.as_const() : Const(0, 1);
+	mem->parameters["\\WR_CLK_ENABLE"] = wr_ports ? sig_wr_clk_enable.as_const() : State::S0;
-	mem->parameters["\\WR_CLK_POLARITY"] = wr_ports ? sig_wr_clk_polarity.as_const() : Const(0, 1);
+	mem->parameters["\\WR_CLK_POLARITY"] = wr_ports ? sig_wr_clk_polarity.as_const() : State::S0;
 
 	mem->setPort("\\WR_CLK", sig_wr_clk);
 	mem->setPort("\\WR_ADDR", sig_wr_addr);
@@ -209,9 +209,9 @@ Cell *handle_memory(Module *module, RTLIL::Memory *memory)
 	log_assert(sig_rd_data.size() == rd_ports * memory->width);
 
 	mem->parameters["\\RD_PORTS"] = Const(rd_ports);
-	mem->parameters["\\RD_CLK_ENABLE"] = rd_ports ? sig_rd_clk_enable.as_const() : Const(0, 1);
+	mem->parameters["\\RD_CLK_ENABLE"] = rd_ports ? sig_rd_clk_enable.as_const() : State::S0;
-	mem->parameters["\\RD_CLK_POLARITY"] = rd_ports ? sig_rd_clk_polarity.as_const() : Const(0, 1);
+	mem->parameters["\\RD_CLK_POLARITY"] = rd_ports ? sig_rd_clk_polarity.as_const() : State::S0;
-	mem->parameters["\\RD_TRANSPARENT"] = rd_ports ? sig_rd_transparent.as_const() : Const(0, 1);
+	mem->parameters["\\RD_TRANSPARENT"] = rd_ports ? sig_rd_transparent.as_const() : State::S0;
 
 	mem->setPort("\\RD_CLK", sig_rd_clk);
 	mem->setPort("\\RD_ADDR", sig_rd_addr);

passes/memory/memory_map.cc

@@ -301,7 +301,7 @@ struct MemoryMapWorker
 
 					RTLIL::Wire *w = w_seladdr;
 
-					if (wr_bit != RTLIL::SigSpec(1, 1))
+					if (wr_bit != State::S1)
 					{
 						RTLIL::Cell *c = module->addCell(genid(cell->name, "$wren", i, "", j, "", wr_offset), "$and");
 						c->parameters["\\A_SIGNED"] = RTLIL::Const(0);

passes/sat/eval.cc

@@ -47,8 +47,8 @@ struct BruteForceEquivChecker
 	{
 		if (inputs.size() < mod1_inputs.size()) {
 			RTLIL::SigSpec inputs0 = inputs, inputs1 = inputs;
-			inputs0.append(RTLIL::Const(0, 1));
+			inputs0.append(State::S0);
-			inputs1.append(RTLIL::Const(1, 1));
+			inputs1.append(State::S1);
 			run_checker(inputs0);
 			run_checker(inputs1);
 			return;

passes/sat/miter.cc

@@ -236,7 +236,7 @@ void create_miter_equiv(struct Pass *that, std::vector<std::string> args, RTLIL:
 	if (flag_make_assert) {
 		RTLIL::Cell *assert_cell = miter_module->addCell(NEW_ID, "$assert");
 		assert_cell->setPort("\\A", all_conditions);
-		assert_cell->setPort("\\EN", RTLIL::SigSpec(1, 1));
+		assert_cell->setPort("\\EN", State::S1);
 	}
 
 	RTLIL::Wire *w_trigger = miter_module->addWire("\\trigger");

passes/techmap/simplemap.cc

@@ -185,7 +185,7 @@ static void logic_reduce(RTLIL::Module *module, RTLIL::SigSpec &sig, RTLIL::Cell
 	}
 
 	if (sig.size() == 0)
-		sig = RTLIL::SigSpec(0, 1);
+		sig = State::S0;
 }
 
 void simplemap_lognot(RTLIL::Module *module, RTLIL::Cell *cell)