From 32dce4a870e8f556897096a0c252b2e43f5622e5 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Sun, 14 Dec 2014 17:37:46 +0100
Subject: [PATCH] Added "blif -unbuf" feature

---
 backends/blif/blif.cc | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/backends/blif/blif.cc b/backends/blif/blif.cc
index 216e59fb5..18f76f7e4 100644
--- a/backends/blif/blif.cc
+++ b/backends/blif/blif.cc
@@ -40,6 +40,7 @@ struct BlifDumperConfig
 	bool param_mode;
 
 	std::string buf_type, buf_in, buf_out;
+	std::map<RTLIL::IdString, std::pair<RTLIL::IdString, RTLIL::IdString>> unbuf_types;
 	std::string true_type, true_out, false_type, false_out;
 
 	BlifDumperConfig() : icells_mode(false), conn_mode(false), impltf_mode(false), gates_mode(false), param_mode(false) { }
@@ -146,6 +147,13 @@ struct BlifDumper
 		{
 			RTLIL::Cell *cell = cell_it.second;
 
+			if (config->unbuf_types.count(cell->type)) {
+				auto portnames = config->unbuf_types.at(cell->type);
+				f << stringf(".names %s %s\n1 1\n",
+						cstr(cell->getPort(portnames.first)), cstr(cell->getPort(portnames.second)));
+				continue;
+			}
+
 			if (!config->icells_mode && cell->type == "$_NOT_") {
 				f << stringf(".names %s %s\n0 1\n",
 						cstr(cell->getPort("\\A")), cstr(cell->getPort("\\Y")));
@@ -279,6 +287,10 @@ struct BlifBackend : public Backend {
 		log("    -buf <cell-type> <in-port> <out-port>\n");
 		log("        use cells of type <cell-type> with the specified port names for buffers\n");
 		log("\n");
+		log("    -unbuf <cell-type> <in-port> <out-port>\n");
+		log("        replace buffer cells with the specified name and port names with\n");
+		log("        a .names statement that models a buffer\n");
+		log("\n");
 		log("    -true <cell-type> <out-port>\n");
 		log("    -false <cell-type> <out-port>\n");
 		log("        use the specified cell types to drive nets that are constant 1 or 0\n");
@@ -329,6 +341,13 @@ struct BlifBackend : public Backend {
 				config.buf_out = args[++argidx];
 				continue;
 			}
+			if (args[argidx] == "-unbuf" && argidx+3 < args.size()) {
+				RTLIL::IdString unbuf_type = RTLIL::escape_id(args[++argidx]);
+				RTLIL::IdString unbuf_in = RTLIL::escape_id(args[++argidx]);
+				RTLIL::IdString unbuf_out = RTLIL::escape_id(args[++argidx]);
+				config.unbuf_types[unbuf_type] = std::pair<RTLIL::IdString, RTLIL::IdString>(unbuf_in, unbuf_out);
+				continue;
+			}
 			if (args[argidx] == "-true" && argidx+2 < args.size()) {
 				config.true_type = args[++argidx];
 				config.true_out = args[++argidx];
-- 
2.30.2