Added "blif -unbuf" feature

diff --git a/backends/blif/blif.cc b/backends/blif/blif.cc
index 216e59fb529d8097227d2c7b6ed83b3265d751dd..18f76f7e473a8ae93b1f3dc37e24c9b0388df3d8 100644 (file)
--- 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];