Added "prep -nokeepdc"

diff --git a/techlibs/common/prep.cc b/techlibs/common/prep.cc
index fac6c4bacbd30e7ee39246b685d987ffc5d19842..71534983d23ebb55d6c14b88354bcb30263a7272 100644 (file)
--- a/techlibs/common/prep.cc
+++ b/techlibs/common/prep.cc
@@ -63,6 +63,9 @@ struct PrepPass : public ScriptPass
                log("    -nordff\n");
                log("        passed to 'memory_dff'. prohibits merging of FFs into memory read ports\n");
                log("\n");
+               log("     -nokeepdc\n");
+               log("        do not call opt_* with -keepdc\n");
+               log("\n");
                log("    -run <from_label>[:<to_label>]\n");
                log("        only run the commands between the labels (see below). an empty\n");
                log("        from label is synonymous to 'begin', and empty to label is\n");
@@ -75,7 +78,7 @@ struct PrepPass : public ScriptPass
        }
 
        string top_module, fsm_opts, memory_opts;
-       bool autotop, flatten, ifxmode, memxmode, nomemmode;
+       bool autotop, flatten, ifxmode, memxmode, nomemmode, nokeepdc;
 
        virtual void clear_flags() YS_OVERRIDE
        {
@@ -87,6 +90,7 @@ struct PrepPass : public ScriptPass
                ifxmode = false;
                memxmode = false;
                nomemmode = false;
+               nokeepdc = false;
        }
 
        virtual void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@@ -136,6 +140,10 @@ struct PrepPass : public ScriptPass
                                memory_opts += " -nordff";
                                continue;
                        }
+                       if (args[argidx] == "-nokeepdc") {
+                               nokeepdc = true;
+                               continue;
+                       }
                        break;
                }
                extra_args(args, argidx, design);
@@ -177,10 +185,10 @@ struct PrepPass : public ScriptPass
                                run(ifxmode ? "proc -ifx" : "proc");
                        if (help_mode || flatten)
                                run("flatten", "(if -flatten)");
-                       run("opt_expr -keepdc");
+                       run(nokeepdc ? "opt_expr" : "opt_expr -keepdc");
                        run("opt_clean");
                        run("check");
-                       run("opt -keepdc");
+                       run(nokeepdc ? "opt" : "opt -keepdc");
                        if (!ifxmode) {
                                if (help_mode)
                                        run("wreduce [-memx]");
@@ -194,7 +202,7 @@ struct PrepPass : public ScriptPass
                                run("opt_clean");
                                run("memory_collect");
                        }
-                       run("opt -keepdc -fast");
+                       run(nokeepdc ? "opt -fast" : "opt -keepdc -fast");
                }
 
                if (check_label("check"))