Added skeleton dff2dffe pass

diff --git a/passes/techmap/Makefile.inc b/passes/techmap/Makefile.inc
index 56083ed2b022e40bfb6da5d12241f5534985ea9e..773a099ace087bd6121a2ee823815a232dda33bb 100644 (file)
--- a/passes/techmap/Makefile.inc
+++ b/passes/techmap/Makefile.inc
@@ -10,6 +10,7 @@ OBJS += passes/techmap/hilomap.o
 OBJS += passes/techmap/extract.o
 OBJS += passes/techmap/maccmap.o
 OBJS += passes/techmap/alumacc.o
+OBJS += passes/techmap/dff2dffe.o
 endif
 
 GENFILES += passes/techmap/techmap.inc

diff --git a/passes/techmap/alumacc.cc b/passes/techmap/alumacc.cc
index 03174ea042736dc9da910ebef2b31eb016ffb4f0..2e297a2c68980f71bc8a13d903b5bc04283a7d17 100644 (file)
--- a/passes/techmap/alumacc.cc
+++ b/passes/techmap/alumacc.cc
@@ -538,8 +538,8 @@ struct AlumaccPass : public Pass {
                log("\n");
                log("    alumacc [selection]\n");
                log("\n");
-               log("This pass translates arithmetic operations $add, $mul, $lt, etc. to $alu and\n");
-               log("$macc cells.\n");
+               log("This pass translates arithmetic operations like $add, $mul, $lt, etc. to $alu\n");
+               log("and $macc cells.\n");
                log("\n");
        }
        virtual void execute(std::vector<std::string> args, RTLIL::Design *design)

diff --git a/passes/techmap/dff2dffe.cc b/passes/techmap/dff2dffe.cc
new file mode 100644 (file)
index 0000000..6a1261f
--- /dev/null
+++ b/passes/techmap/dff2dffe.cc
@@ -0,0 +1,75 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *  
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *  
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "kernel/yosys.h"
+#include "kernel/sigtools.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+struct Dff2dffeWorker
+{
+       RTLIL::Module *module;
+       SigMap sigmap;
+
+       Dff2dffeWorker(RTLIL::Module *module) : module(module), sigmap(module)
+       {
+       }
+
+       void run()
+       {
+               log("Transforming $dff to $dffe cells in module %s:\n", log_id(module));
+       }
+};
+
+struct Dff2dffePass : public Pass {
+       Dff2dffePass() : Pass("dff2dffe", "transform $dff cells to $dffe cells") { }
+       virtual void help()
+       {
+               //   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+               log("\n");
+               log("    dff2dffe [selection]\n");
+               log("\n");
+               log("This pass transforms $dff cells driven by a tree of multiplexers with one or\n");
+               log("more feedback paths to a $dffe cells.\n");
+               log("\n");
+       }
+       virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
+       {
+               log_header("Executing DFF2DFFE pass (transform $dff to $dffe where applicable).\n");
+
+               size_t argidx;
+               for (argidx = 1; argidx < args.size(); argidx++) {
+                       // if (args[argidx] == "-foobar") {
+                       //      foobar_mode = true;
+                       //      continue;
+                       // }
+                       break;
+               }
+               extra_args(args, argidx, design);
+
+               for (auto mod : design->selected_modules())
+                       if (!mod->has_processes_warn()) {
+                               Dff2dffeWorker worker(mod);
+                               worker.run();
+                       }
+       }
+} Dff2dffePass;
+ 
+PRIVATE_NAMESPACE_END