From acfaeb8d34f6be33e09f780159a6ec702357697d Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Sun, 25 Jan 2015 14:20:22 +0100
Subject: Added equiv_remove

---
 passes/equiv/Makefile.inc    |  1 +
 passes/equiv/equiv_remove.cc | 83 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 passes/equiv/equiv_remove.cc

diff --git a/passes/equiv/Makefile.inc b/passes/equiv/Makefile.inc
index c952fae5..06b00ef3 100644
--- a/passes/equiv/Makefile.inc
+++ b/passes/equiv/Makefile.inc
@@ -3,5 +3,6 @@ OBJS += passes/equiv/equiv_make.o
 OBJS += passes/equiv/equiv_miter.o
 OBJS += passes/equiv/equiv_simple.o
 OBJS += passes/equiv/equiv_status.o
+OBJS += passes/equiv/equiv_remove.o
 OBJS += passes/equiv/equiv_induct.o
 
diff --git a/passes/equiv/equiv_remove.cc b/passes/equiv/equiv_remove.cc
new file mode 100644
index 00000000..b6e232f9
--- /dev/null
+++ b/passes/equiv/equiv_remove.cc
@@ -0,0 +1,83 @@
+/*
+ *  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"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+struct EquivRemovePass : public Pass {
+	EquivRemovePass() : Pass("equiv_remove", "remove $equiv cells") { }
+	virtual void help()
+	{
+		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+		log("\n");
+		log("    equiv_remove [options] [selection]\n");
+		log("\n");
+		log("This command removes the selected $equiv cells. If neither -gold nor -gate is\n");
+		log("used then only proven cells are removed.\n");
+		log("\n");
+		log("    -gold\n");
+		log("        keep gold circuit\n");
+		log("\n");
+		log("    -gate\n");
+		log("        keep gate circuit\n");
+		log("\n");
+	}
+	virtual void execute(std::vector<std::string> args, Design *design)
+	{
+		bool mode_gold = false;
+		bool mode_gate = false;
+		int remove_count = 0;
+
+		log_header("Executing EQUIV_REMOVE pass.\n");
+
+		size_t argidx;
+		for (argidx = 1; argidx < args.size(); argidx++) {
+			if (args[argidx] == "-gold") {
+				mode_gold = true;
+				continue;
+			}
+			if (args[argidx] == "-gate") {
+				mode_gate = true;
+				continue;
+			}
+			break;
+		}
+		extra_args(args, argidx, design);
+
+		if (mode_gold && mode_gate)
+			log_cmd_error("Options -gold and -gate are exclusive.\n");
+
+		for (auto module : design->selected_modules())
+		{
+			for (auto cell : module->selected_cells())
+				if (cell->type == "$equiv" && (mode_gold || mode_gate || cell->getPort("\\A") == cell->getPort("\\B"))) {
+					log("Removing $equiv cell %s.%s (%s).\n", log_id(module), log_id(cell), log_signal(cell->getPort("\\Y")));
+					module->connect(cell->getPort("\\Y"), mode_gate ? cell->getPort("\\B") : cell->getPort("\\A"));
+					module->remove(cell);
+					remove_count++;
+				}
+		}
+
+		log("Removed a total of %d $equiv cells.\n", remove_count);
+	}
+} EquivRemovePass;
+
+PRIVATE_NAMESPACE_END
-- 
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