Added CellEdgesDatabase API

1 files changed, 88 insertions, 0 deletions

diff --git a/kernel/celledges.cc b/kernel/celledges.cc
new file mode 100644
index 000000000..b6786b116
--- /dev/null
+++ b/kernel/celledges.cc
@@ -0,0 +1,88 @@
+/*
+ *  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/celledges.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+void add_bitwise_unary_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
+{
+	IdString A = "\\A", Y = "\\Y";
+
+	bool is_signed = cell->getParam("\\A_SIGNED").as_bool();
+	int a_width = GetSize(cell->getPort(A));
+	int y_width = GetSize(cell->getPort(Y));
+
+	for (int i = 0; i < y_width; i++)
+	{
+		if (i < a_width)
+			db->add_edge(cell, A, i, Y, i);
+		else if (is_signed && a_width > 0)
+			db->add_edge(cell, A, a_width-1, Y, i);
+	}
+}
+
+void add_bitwise_binary_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
+{
+	IdString A = "\\A", B = "\\B", Y = "\\Y";
+
+	bool is_signed = cell->getParam("\\A_SIGNED").as_bool();
+	int a_width = GetSize(cell->getPort(A));
+	int b_width = GetSize(cell->getPort(B));
+	int y_width = GetSize(cell->getPort(Y));
+
+	if (cell->type == "$and" && !is_signed) {
+		if (a_width > b_width)
+			a_width = b_width;
+		else
+			b_width = a_width;
+	}
+
+	for (int i = 0; i < y_width; i++)
+	{
+		if (i < a_width)
+			db->add_edge(cell, A, i, Y, i);
+		else if (is_signed && a_width > 0)
+			db->add_edge(cell, A, a_width-1, Y, i);
+
+		if (i < b_width)
+			db->add_edge(cell, B, i, Y, i);
+		else if (is_signed && b_width > 0)
+			db->add_edge(cell, B, b_width-1, Y, i);
+	}
+}
+
+PRIVATE_NAMESPACE_END
+
+bool YOSYS_NAMESPACE_PREFIX AbstractCellEdgesDatabase::add_cell(RTLIL::Cell *cell)
+{
+	if (cell->type.in("$not", "$pos")) {
+		add_bitwise_unary_op(this, cell);
+		return true;
+	}
+
+	if (cell->type.in("$and", "$or", "$xor", "$xnor")) {
+		add_bitwise_binary_op(this, cell);
+		return true;
+	}
+
+	return false;
+}
+