add help for nowidelut and abc9 options

diff --git a/techlibs/gowin/synth_gowin.cc b/techlibs/gowin/synth_gowin.cc
index a70ff93bb011b394839b8c57c66cfa51a14e8070..bb6d44e003505e177b1df25a08d226ceb1ec96f3 100644 (file)
--- a/techlibs/gowin/synth_gowin.cc
+++ b/techlibs/gowin/synth_gowin.cc
@@ -64,6 +64,12 @@ struct SynthGowinPass : public ScriptPass
                log("    -retime\n");
                log("        run 'abc' with -dff option\n");
                log("\n");
+               log("    -nowidelut\n");
+               log("        do not use muxes to implement LUTs larger than LUT4s\n");
+               log("\n");
+               log("    -abc9\n");
+               log("        use new ABC9 flow (EXPERIMENTAL)\n");
+               log("\n");
                log("\n");
                log("The following commands are executed by this synthesis command:\n");
                help_script();
@@ -173,7 +179,7 @@ struct SynthGowinPass : public ScriptPass
                {
                        run("synth -run coarse");
                }
-               
+
                if (!nobram && check_label("bram", "(skip if -nobram)"))
                {
                        run("memory_bram -rules +/gowin/bram.txt");