synth_ice40 now flattens by default

diff --git a/techlibs/ice40/synth_ice40.cc b/techlibs/ice40/synth_ice40.cc
index e1cfa977becb53591d94b049f8d75df7111463f1..236c27a547a067b82b4ee4117449a90f22ed6863 100644 (file)
--- a/techlibs/ice40/synth_ice40.cc
+++ b/techlibs/ice40/synth_ice40.cc
@@ -60,8 +60,8 @@ struct SynthIce40Pass : public Pass {
                log("        from label is synonymous to 'begin', and empty to label is\n");
                log("        synonymous to the end of the command list.\n");
                log("\n");
-               log("    -flatten\n");
-               log("        flatten design before synthesis\n");
+               log("    -noflatten\n");
+               log("        do not flatten design before synthesis\n");
                log("\n");
                log("    -retime\n");
                log("        run 'abc' with -dff option\n");
@@ -79,7 +79,7 @@ struct SynthIce40Pass : public Pass {
                log("        read_verilog -lib +/ice40/cells_sim.v\n");
                log("        hierarchy -check -top <top>\n");
                log("\n");
-               log("    flatten:         (only if -flatten)\n");
+               log("    flatten:         (unless -noflatten)\n");
                log("        proc\n");
                log("        flatten\n");
                log("\n");
@@ -133,7 +133,7 @@ struct SynthIce40Pass : public Pass {
                std::string blif_file, edif_file;
                bool nocarry = false;
                bool nobram = false;
-               bool flatten = false;
+               bool flatten = true;
                bool retime = false;
 
                size_t argidx;
@@ -163,6 +163,10 @@ struct SynthIce40Pass : public Pass {
                                flatten = true;
                                continue;
                        }
+                       if (args[argidx] == "-noflatten") {
+                               flatten = false;
+                               continue;
+                       }
                        if (args[argidx] == "-retime") {
                                retime = true;
                                continue;