Progress in SMV back-end

1 files changed, 72 insertions, 11 deletions

diff --git a/backends/smv/smv.cc b/backends/smv/smv.cc
index 1758995d1..86a6c3c72 100644
--- a/backends/smv/smv.cc
+++ b/backends/smv/smv.cc
@@ -166,7 +166,7 @@ struct SmvWorker
 		f << stringf("  VAR\n");
 
 		for (auto wire : module->wires())
-			f << stringf("    %s : unsigned word[%d];\n", cid(wire->name), wire->width);
+			f << stringf("    %s : unsigned word[%d]; -- %s\n", cid(wire->name), wire->width, log_id(wire));
 
 		for (auto cell : module->cells())
 		{
@@ -374,8 +374,65 @@ struct SmvWorker
 				continue;
 			}
 
-			// FIXME: $_BUF_, $_NOT_, $_AND_, $_NAND_, $_OR_, $_NOR_,
-			// $_XOR_, $_XNOR_, $_MUX_, $_AOI3_, $_OAI3_, $_AOI4_, $_OAI4_ 
+			if (cell->type.in("$_BUF_", "$_NOT_"))
+			{
+				string op = cell->type == "$_NOT_" ? "!" : "";
+				assignments.push_back(stringf("%s := %s%s;", lvalue(cell->getPort("\\Y")), op.c_str(), rvalue(cell->getPort("\\A"))));
+				continue;
+			}
+
+			if (cell->type.in("$_AND_", "$_NAND_", "$_OR_", "$_NOR_", "$_XOR_", "$_XNOR_"))
+			{
+				string op;
+
+				if (cell->type.in("$_AND_", "$_NAND_")) op = "&";
+				if (cell->type.in("$_OR_", "$_NOR_")) op = "|";
+				if (cell->type.in("$_XOR_"))  op = "xor";
+				if (cell->type.in("$_XNOR_"))  op = "xnor";
+
+				if (cell->type.in("$_NAND_", "$_NOR_"))
+					assignments.push_back(stringf("%s := !(%s %s %s);", lvalue(cell->getPort("\\Y")),
+							rvalue(cell->getPort("\\A")), op.c_str(), rvalue(cell->getPort("\\B"))));
+				else
+					assignments.push_back(stringf("%s := %s %s %s;", lvalue(cell->getPort("\\Y")),
+							rvalue(cell->getPort("\\A")), op.c_str(), rvalue(cell->getPort("\\B"))));
+				continue;
+			}
+
+			if (cell->type == "$_MUX_")
+			{
+				assignments.push_back(stringf("%s := %s ? %s : %s;", lvalue(cell->getPort("\\Y")),
+						rvalue(cell->getPort("\\S")), rvalue(cell->getPort("\\B")), rvalue(cell->getPort("\\A"))));
+				continue;
+			}
+
+			if (cell->type == "$_AOI3_")
+			{
+				assignments.push_back(stringf("%s := !((%s & %s) | %s);", lvalue(cell->getPort("\\Y")),
+						rvalue(cell->getPort("\\A")), rvalue(cell->getPort("\\B")), rvalue(cell->getPort("\\C"))));
+				continue;
+			}
+
+			if (cell->type == "$_OAI3_")
+			{
+				assignments.push_back(stringf("%s := !((%s | %s) & %s);", lvalue(cell->getPort("\\Y")),
+						rvalue(cell->getPort("\\A")), rvalue(cell->getPort("\\B")), rvalue(cell->getPort("\\C"))));
+				continue;
+			}
+
+			if (cell->type == "$_AOI4_")
+			{
+				assignments.push_back(stringf("%s := !((%s & %s) | (%s & %s));", lvalue(cell->getPort("\\Y")),
+						rvalue(cell->getPort("\\A")), rvalue(cell->getPort("\\B")), rvalue(cell->getPort("\\C")), rvalue(cell->getPort("\\D"))));
+				continue;
+			}
+
+			if (cell->type == "$_OAI4_")
+			{
+				assignments.push_back(stringf("%s := !((%s | %s) & (%s | %s));", lvalue(cell->getPort("\\Y")),
+						rvalue(cell->getPort("\\A")), rvalue(cell->getPort("\\B")), rvalue(cell->getPort("\\C")), rvalue(cell->getPort("\\D"))));
+				continue;
+			}
 
 			if (cell->type[0] == '$')
 				log_error("Found currently unsupported cell type %s (%s.%s).\n", log_id(cell->type), log_id(module), log_id(cell));
@@ -473,7 +530,7 @@ struct SmvBackend : public Backend {
 				while (indent < GetSize(line) && (line[indent] == ' ' || line[indent] == '\t'))
 					indent++;
 
-				if (line[indent] == '$')
+				if (line[indent] == '%')
 				{
 					vector<string> stmt = split_tokens(line);
 
@@ -483,6 +540,7 @@ struct SmvBackend : public Backend {
 					if (GetSize(stmt) == 2 && stmt[0] == "%module")
 					{
 						Module *module = design->module(RTLIL::escape_id(stmt[1]));
+						modules.erase(module);
 
 						if (module == nullptr)
 							log_error("Module '%s' not found.\n", stmt[1].c_str());
@@ -504,15 +562,18 @@ struct SmvBackend : public Backend {
 			}
 		}
 
-		*f << stringf("-- SMV description generated by %s\n", yosys_version_str);
+		if (!modules.empty())
+		{
+			*f << stringf("-- SMV description generated by %s\n", yosys_version_str);
 
-		for (auto module : modules) {
-			log("Creating SMV representation of module %s.\n", log_id(module));
-			SmvWorker worker(module, verbose, *f);
-			worker.run();
-		}
+			for (auto module : modules) {
+				log("Creating SMV representation of module %s.\n", log_id(module));
+				SmvWorker worker(module, verbose, *f);
+				worker.run();
+			}
 
-		*f << stringf("-- end of yosys output\n");
+			*f << stringf("-- end of yosys output\n");
+		}
 
 		if (template_f.is_open()) {
 			std::string line;