From 46fbe9d26299a7b6197463b3056d778f525658fb Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Fri, 7 Jun 2013 13:59:13 +0200
Subject: Added SAT generator and simple sat_solve command

---
 kernel/satgen.h | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 kernel/satgen.h

(limited to 'kernel')

diff --git a/kernel/satgen.h b/kernel/satgen.h
new file mode 100644
index 000000000..500c3f105
--- /dev/null
+++ b/kernel/satgen.h
@@ -0,0 +1,137 @@
+/*
+ *  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.
+ *
+ */
+
+#ifndef SATGEN_H
+#define SATGEN_H
+
+#include "kernel/rtlil.h"
+#include "kernel/sigtools.h"
+#include "kernel/celltypes.h"
+
+#ifdef YOSYS_ENABLE_MINISAT
+#  include "libs/ezsat/ezminisat.h"
+typedef ezMiniSAT ezDefaultSAT;
+#else
+#  include "libs/ezsat/ezsat.h"
+typedef ezSAT ezDefaultSAT;
+#endif
+
+struct SatGen
+{
+	ezSAT *ez;
+	RTLIL::Design *design;
+	SigMap *sigmap;
+	std::string prefix;
+
+	SatGen(ezSAT *ez, RTLIL::Design *design, SigMap *sigmap, std::string prefix = std::string()) :
+			ez(ez), design(design), sigmap(sigmap), prefix(prefix)
+	{
+	}
+
+	void setContext(RTLIL::Design *design, SigMap *sigmap, std::string prefix = std::string())
+	{
+		this->design = design;
+		this->sigmap = sigmap;
+		this->prefix = prefix;
+	}
+
+	virtual ~SatGen()
+	{
+	}
+
+	virtual std::vector<int> importSigSpec(RTLIL::SigSpec &sig)
+	{
+		RTLIL::SigSpec s = sig;
+		sigmap->apply(s);
+		s.expand();
+
+		std::vector<int> vec;
+		vec.reserve(s.chunks.size());
+
+		for (auto &c : s.chunks)
+			if (c.wire == NULL)
+				vec.push_back(c.data.as_bool() ? ez->TRUE : ez->FALSE);
+			else
+				vec.push_back(ez->literal(prefix + stringf(c.wire->width == 1 ?
+						"%s" : "%s [%d]", RTLIL::id2cstr(c.wire->name), c.offset)));
+		return vec;
+	}
+
+	// ** cell types to be done: **
+	// cell_types.insert("$pos");
+	// cell_types.insert("$neg");
+	// cell_types.insert("$xnor");
+	// cell_types.insert("$reduce_and");
+	// cell_types.insert("$reduce_or");
+	// cell_types.insert("$reduce_xor");
+	// cell_types.insert("$reduce_xnor");
+	// cell_types.insert("$reduce_bool");
+	// cell_types.insert("$shl");
+	// cell_types.insert("$shr");
+	// cell_types.insert("$sshl");
+	// cell_types.insert("$sshr");
+	// cell_types.insert("$lt");
+	// cell_types.insert("$le");
+	// cell_types.insert("$eq");
+	// cell_types.insert("$ne");
+	// cell_types.insert("$ge");
+	// cell_types.insert("$gt");
+	// cell_types.insert("$add");
+	// cell_types.insert("$sub");
+	// cell_types.insert("$mul");
+	// cell_types.insert("$div");
+	// cell_types.insert("$mod");
+	// cell_types.insert("$pow");
+	// cell_types.insert("$logic_not");
+	// cell_types.insert("$logic_and");
+	// cell_types.insert("$logic_or");
+	// cell_types.insert("$pmux");
+	// cell_types.insert("$safe_pmux");
+
+	virtual void importCell(RTLIL::Cell *cell)
+	{
+		if (cell->type == "$_AND_" || cell->type == "$_OR_" || cell->type == "$_XOR_" ||
+				cell->type == "$and" || cell->type == "$or" || cell->type == "$xor") {
+			std::vector<int> a = importSigSpec(cell->connections.at("\\A"));
+			std::vector<int> b = importSigSpec(cell->connections.at("\\B"));
+			std::vector<int> y = importSigSpec(cell->connections.at("\\Y"));
+			if (cell->type == "$and" || cell->type == "$_AND_")
+				ez->assume(ez->vec_eq(ez->vec_and(a, b), y));
+			if (cell->type == "$or" || cell->type == "$_OR_")
+				ez->assume(ez->vec_eq(ez->vec_or(a, b), y));
+			if (cell->type == "$xor" || cell->type == "$_XOR")
+				ez->assume(ez->vec_eq(ez->vec_xor(a, b), y));
+		} else
+		if (cell->type == "$_INV_" || cell->type == "$not") {
+			std::vector<int> a = importSigSpec(cell->connections.at("\\A"));
+			std::vector<int> y = importSigSpec(cell->connections.at("\\Y"));
+			ez->assume(ez->vec_eq(ez->vec_not(a), y));
+		} else
+		if (cell->type == "$_MUX_" || cell->type == "$mux") {
+			std::vector<int> a = importSigSpec(cell->connections.at("\\A"));
+			std::vector<int> b = importSigSpec(cell->connections.at("\\B"));
+			std::vector<int> s = importSigSpec(cell->connections.at("\\S"));
+			std::vector<int> y = importSigSpec(cell->connections.at("\\Y"));
+			ez->assume(ez->vec_eq(ez->vec_ite(s, b, a), y));
+		} else
+			log_error("Can't handle cell type %s in SAT generator yet.\n", RTLIL::id2cstr(cell->type));
+	}
+};
+
+#endif
-- 
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