Fixed all users of SigSpec::chunks_rw() and removed it

kernel/rtlil.h

@@ -533,7 +533,6 @@ public:
 	SigSpec(std::vector<RTLIL::SigBit> bits);
 	SigSpec(std::set<RTLIL::SigBit> bits);
 
-	inline std::vector<RTLIL::SigChunk> &chunks_rw() { pack(); return chunks_; }
 	inline const std::vector<RTLIL::SigChunk> &chunks() const { pack(); return chunks_; }
 	inline const std::vector<RTLIL::SigBit> &bits() const { inline_unpack(); return bits_; }
 
@@ -597,7 +596,8 @@ public:
 	static bool parse_sel(RTLIL::SigSpec &sig, RTLIL::Design *design, RTLIL::Module *module, std::string str);
 	static bool parse_rhs(const RTLIL::SigSpec &lhs, RTLIL::SigSpec &sig, RTLIL::Module *module, std::string str);
 
-	operator std::vector<RTLIL::SigBit>() const { return to_sigbit_vector(); }
+	operator std::vector<RTLIL::SigChunk>() const { return chunks(); }
+	operator std::vector<RTLIL::SigBit>() const { return bits(); }
 
 	void check() const;
 };

passes/cmds/delete.cc

@@ -27,12 +27,13 @@ struct DeleteWireWorker
 	std::set<std::string> *delete_wires_p;
 
 	void operator()(RTLIL::SigSpec &sig) {
-		sig.optimize();
-		for (auto &c : sig.chunks_rw())
+		std::vector<RTLIL::SigChunk> chunks = sig;
+		for (auto &c : chunks)
 			if (c.wire != NULL && delete_wires_p->count(c.wire->name)) {
 				c.wire = module->addWire(NEW_ID, c.width);
 				c.offset = 0;
 			}
+		sig = chunks;
 	}
 };
 

passes/cmds/setundef.cc

@@ -23,10 +23,12 @@
 #include "kernel/rtlil.h"
 #include "kernel/log.h"
 
-static int next_bit_mode;
-static uint32_t next_bit_state;
+struct SetundefWorker
+{
+	int next_bit_mode;
+	uint32_t next_bit_state;
 
-static RTLIL::State next_bit()
+	RTLIL::State next_bit()
 	{
 		if (next_bit_mode == 0)
 			return RTLIL::State::S0;
@@ -43,15 +45,11 @@ static RTLIL::State next_bit()
 		return ((next_bit_state >> (next_bit_state & 15)) & 16) ? RTLIL::State::S0 : RTLIL::State::S1;
 	}
 
-struct SetundefWorker
-{
 	void operator()(RTLIL::SigSpec &sig)
 	{
-		sig.expand();
-		for (auto &c : sig.chunks_rw())
-			if (c.wire == NULL && c.data.bits.at(0) > RTLIL::State::S1)
-				c.data.bits.at(0) = next_bit();
-		sig.optimize();
+		for (auto &bit : sig)
+			if (bit.wire == NULL && bit.data > RTLIL::State::S1)
+				bit = next_bit();
 	}
 };
 
@@ -83,6 +81,7 @@ struct SetundefPass : public Pass {
 	{
 		bool got_value = false;
 		bool undriven_mode = false;
+		SetundefWorker worker;
 
 		size_t argidx;
 		for (argidx = 1; argidx < args.size(); argidx++)
@@ -93,20 +92,20 @@ struct SetundefPass : public Pass {
 			}
 			if (args[argidx] == "-zero") {
 				got_value = true;
-				next_bit_mode = 0;
+				worker.next_bit_mode = 0;
 				continue;
 			}
 			if (args[argidx] == "-one") {
 				got_value = true;
-				next_bit_mode = 1;
+				worker.next_bit_mode = 1;
 				continue;
 			}
 			if (args[argidx] == "-random" && !got_value && argidx+1 < args.size()) {
 				got_value = true;
-				next_bit_mode = 2;
-				next_bit_state = atoi(args[++argidx].c_str()) + 1;
+				worker.next_bit_mode = 2;
+				worker.next_bit_state = atoi(args[++argidx].c_str()) + 1;
 				for (int i = 0; i < 10; i++)
-					next_bit();
+					worker.next_bit();
 				continue;
 			}
 			break;
@@ -144,13 +143,13 @@ struct SetundefPass : public Pass {
 				for (auto &c : sig.chunks()) {
 					RTLIL::SigSpec bits;
 					for (int i = 0; i < c.width; i++)
-						bits.append(next_bit());
+						bits.append(worker.next_bit());
 					bits.optimize();
 					module->connections.push_back(RTLIL::SigSig(c, bits));
 				}
 			}
 
-			module->rewrite_sigspecs(SetundefWorker());
+			module->rewrite_sigspecs(worker);
 		}
 	}
 } SetundefPass;

passes/cmds/splitnets.cc

@@ -62,11 +62,9 @@ struct SplitnetsWorker
 
 	void operator()(RTLIL::SigSpec &sig)
 	{
-		sig.expand();
-		for (auto &c : sig.chunks_rw())
-			if (splitmap.count(c.wire) > 0)
-				c = splitmap.at(c.wire).at(c.offset);
-		sig.optimize();
+		for (auto &bit : sig)
+			if (splitmap.count(bit.wire) > 0)
+				bit = splitmap.at(bit.wire).at(bit.offset);
 	}
 };
 

passes/hierarchy/submod.cc

@@ -164,10 +164,10 @@ struct SubmodWorker
 		for (RTLIL::Cell *cell : submod.cells) {
 			RTLIL::Cell *new_cell = new RTLIL::Cell(*cell);
 			for (auto &conn : new_cell->connections)
-				for (auto &c : conn.second.chunks_rw())
-					if (c.wire != NULL) {
-						assert(wire_flags.count(c.wire) > 0);
-						c.wire = wire_flags[c.wire].new_wire;
+				for (auto &bit : conn.second)
+					if (bit.wire != NULL) {
+						assert(wire_flags.count(bit.wire) > 0);
+						bit.wire = wire_flags[bit.wire].new_wire;
 					}
 			log("  cell %s (%s)\n", new_cell->name.c_str(), new_cell->type.c_str());
 			new_mod->cells[new_cell->name] = new_cell;

passes/memory/memory_dff.cc

@@ -32,13 +32,10 @@ static void normalize_sig(RTLIL::Module *module, RTLIL::SigSpec &sig)
 static bool find_sig_before_dff(RTLIL::Module *module, RTLIL::SigSpec &sig, RTLIL::SigSpec &clk, bool &clk_polarity, bool after = false)
 {
 	normalize_sig(module, sig);
-	sig.expand();
 
-	for (size_t i = 0; i < sig.chunks().size(); i++)
+	for (auto &bit : sig)
 	{
-		RTLIL::SigChunk &chunk = sig.chunks_rw()[i];
-
-		if (chunk.wire == NULL)
+		if (bit.wire == NULL)
 			continue;
 
 		for (auto &cell_it : module->cells)
@@ -58,12 +55,11 @@ static bool find_sig_before_dff(RTLIL::Module *module, RTLIL::SigSpec &sig, RTLI
 			RTLIL::SigSpec q_norm = cell->connections[after ? "\\D" : "\\Q"];
 			normalize_sig(module, q_norm);
 
-			RTLIL::SigSpec d = q_norm.extract(chunk, &cell->connections[after ? "\\Q" : "\\D"]);
+			RTLIL::SigSpec d = q_norm.extract(bit, &cell->connections[after ? "\\Q" : "\\D"]);
 			if (d.size() != 1)
 				continue;
 
-			assert(d.chunks().size() == 1);
-			chunk = d.chunks()[0];
+			bit = d;
 			clk = cell->connections["\\CLK"];
 			clk_polarity = cell->parameters["\\CLK_POLARITY"].as_bool();
 			goto replaced_this_bit;

passes/proc/proc_arst.cc

@@ -165,11 +165,9 @@ restart_proc_arst:
 				for (auto &action : sync->actions) {
 					RTLIL::SigSpec rspec = action.second;
 					RTLIL::SigSpec rval = RTLIL::SigSpec(RTLIL::State::Sm, rspec.size());
-					rspec.expand(), rval.expand();
-					for (int i = 0; i < int(rspec.chunks().size()); i++)
-						if (rspec.chunks()[i].wire == NULL)
-							rval.chunks_rw()[i] = rspec.chunks()[i];
-					rspec.optimize(), rval.optimize();
+					for (int i = 0; i < SIZE(rspec); i++)
+						if (rspec[i].wire == NULL)
+							rval[i] = rspec[i];
 					RTLIL::SigSpec last_rval;
 					for (int count = 0; rval != last_rval; count++) {
 						last_rval = rval;

passes/sat/eval.cc

@@ -70,11 +70,9 @@ struct BruteForceEquivChecker
 					log_signal(undef2), log_signal(mod1_inputs), log_signal(inputs));
 
 		if (ignore_x_mod1) {
-			sig1.expand(), sig2.expand();
-			for (size_t i = 0; i < sig1.chunks().size(); i++)
-				if (sig1.chunks().at(i) == RTLIL::SigChunk(RTLIL::State::Sx))
-					sig2.chunks_rw().at(i) = RTLIL::SigChunk(RTLIL::State::Sx);
-			sig1.optimize(), sig2.optimize();
+			for (int i = 0; i < SIZE(sig1); i++)
+				if (sig1[i] == RTLIL::State::Sx)
+					sig2[i] = RTLIL::State::Sx;
 		}
 
 		if (sig1 != sig2) {
@@ -297,9 +295,9 @@ struct VlogHammerReporter
 					sig.expand();
 					if (rtl_sig.size() != sig.size())
 						log_error("Output (y) has a different width in module %s compared to rtl!\n", RTLIL::id2cstr(module->name));
-					for (int i = 0; i < sig.size(); i++)
-						if (rtl_sig.chunks().at(i).data.bits.at(0) == RTLIL::State::Sx)
-							sig.chunks_rw().at(i).data.bits.at(0) = RTLIL::State::Sx;
+					for (int i = 0; i < SIZE(sig); i++)
+						if (rtl_sig[i] == RTLIL::State::Sx)
+							sig[i] = RTLIL::State::Sx;
 				}
 
 				log("++RPT++ %d%s %s %s\n", idx, input_pattern_list.c_str(), sig.as_const().as_string().c_str(), module_name.c_str());

passes/techmap/extract.cc

@@ -755,11 +755,11 @@ struct ExtractPass : public Pass {
 					newCell->type = cell->type;
 					newCell->parameters = cell->parameters;
 					for (auto &conn : cell->connections) {
-						RTLIL::SigSpec sig = sigmap(conn.second);
-						for (auto &chunk : sig.chunks_rw())
+						std::vector<RTLIL::SigChunk> chunks = sigmap(conn.second);
+						for (auto &chunk : chunks)
 							if (chunk.wire != NULL)
 								chunk.wire = newMod->wires.at(chunk.wire->name);
-						newCell->connections[conn.first] = sig;
+						newCell->connections[conn.first] = chunks;
 					}
 					newMod->add(newCell);
 				}

passes/techmap/hilomap.cc

@@ -26,36 +26,34 @@ static std::string locell_celltype, locell_portname;
 static bool singleton_mode;
 
 static RTLIL::Module *module;
-static RTLIL::SigChunk last_hi, last_lo;
+static RTLIL::SigBit last_hi, last_lo;
 
 void hilomap_worker(RTLIL::SigSpec &sig)
 {
-	sig.expand();
-	for (auto &c : sig.chunks_rw()) {
-		if (c.wire == NULL && (c.data.bits.at(0) == RTLIL::State::S1) && !hicell_celltype.empty()) {
-			if (!singleton_mode || last_hi.width == 0) {
-				last_hi = RTLIL::SigChunk(module->addWire(NEW_ID));
+	for (auto &bit : sig) {
+		if (bit == RTLIL::State::S1 && !hicell_celltype.empty()) {
+			if (!singleton_mode || last_hi == RTLIL::State::Sm) {
+				last_hi = module->addWire(NEW_ID);
 				RTLIL::Cell *cell = new RTLIL::Cell;
 				cell->name = NEW_ID;
 				cell->type = RTLIL::escape_id(hicell_celltype);
 				cell->connections[RTLIL::escape_id(hicell_portname)] = last_hi;
 				module->add(cell);
 			}
-			c = last_hi;
+			bit = last_hi;
 		}
-		if (c.wire == NULL && (c.data.bits.at(0) == RTLIL::State::S0) && !locell_celltype.empty()) {
-			if (!singleton_mode || last_lo.width == 0) {
-				last_lo = RTLIL::SigChunk(module->addWire(NEW_ID));
+		if (bit == RTLIL::State::S0 && !locell_celltype.empty()) {
+			if (!singleton_mode || last_lo == RTLIL::State::Sm) {
+				last_lo = module->addWire(NEW_ID);
 				RTLIL::Cell *cell = new RTLIL::Cell;
 				cell->name = NEW_ID;
 				cell->type = RTLIL::escape_id(locell_celltype);
 				cell->connections[RTLIL::escape_id(locell_portname)] = last_lo;
 				module->add(cell);
 			}
-			c = last_lo;
+			bit = last_lo;
 		}
 	}
-	sig.optimize();
 }
 
 struct HilomapPass : public Pass {
@@ -119,8 +117,8 @@ struct HilomapPass : public Pass {
 			if (!design->selected(module))
 				continue;
 
-			last_hi = RTLIL::SigChunk();
-			last_lo = RTLIL::SigChunk();
+			last_hi = RTLIL::State::Sm;
+			last_lo = RTLIL::State::Sm;
 
 			module->rewrite_sigspecs(hilomap_worker);
 		}

passes/techmap/techmap.cc

@@ -41,14 +41,15 @@ static void apply_prefix(std::string prefix, std::string &id)
 
 static void apply_prefix(std::string prefix, RTLIL::SigSpec &sig, RTLIL::Module *module)
 {
-	for (size_t i = 0; i < sig.chunks().size(); i++) {
-		if (sig.chunks()[i].wire == NULL)
-			continue;
-		std::string wire_name = sig.chunks()[i].wire->name;
+	std::vector<RTLIL::SigChunk> chunks = sig;
+	for (auto &chunk : chunks)
+		if (chunk.wire != NULL) {
+			std::string wire_name = chunk.wire->name;
 			apply_prefix(prefix, wire_name);
 			assert(module->wires.count(wire_name) > 0);
-		sig.chunks_rw()[i].wire = module->wires[wire_name];
+			chunk.wire = module->wires[wire_name];
 		}
+	sig = chunks;
 }
 
 struct TechmapWorker