Added techmap -max_iter option

diff --git a/passes/techmap/techmap.cc b/passes/techmap/techmap.cc
index f163c024ee1e32e191a0c52bc281194382d4ac7f..937f41315fac375eb626976945a133fb7d2ed7a6 100644 (file)
--- a/passes/techmap/techmap.cc
+++ b/passes/techmap/techmap.cc
@@ -464,6 +464,9 @@ struct TechmapPass : public Pass {
                log("        yosys data files are). this is mainly used internally when techmap\n");
                log("        is called from other commands.\n");
                log("\n");
+               log("    -max_iter <number>\n");
+               log("        only run the specified number of iterations.\n");
+               log("\n");
                log("    -D <define>, -I <incdir>\n");
                log("        this options are passed as-is to the verilog frontend for loading the\n");
                log("        map file. Note that the verilog frontend is also called with the\n");
@@ -542,6 +545,7 @@ struct TechmapPass : public Pass {
 
                std::vector<std::string> map_files;
                std::string verilog_frontend = "verilog -ignore_redef";
+               int max_iter = -1;
 
                size_t argidx;
                for (argidx = 1; argidx < args.size(); argidx++) {
@@ -553,6 +557,10 @@ struct TechmapPass : public Pass {
                                map_files.push_back(get_share_file_name(args[++argidx]));
                                continue;
                        }
+                       if (args[argidx] == "-max_iter" && argidx+1 < args.size()) {
+                               max_iter = atoi(args[++argidx].c_str());
+                               continue;
+                       }
                        if (args[argidx] == "-D" && argidx+1 < args.size()) {
                                verilog_frontend += " -D " + args[++argidx];
                                continue;
@@ -610,6 +618,8 @@ struct TechmapPass : public Pass {
                                        did_something = true;
                        if (did_something)
                                design->check();
+                       if (max_iter > 0 && --max_iter == 0)
+                               break;
                }
 
                log("No more expansions possible.\n");