1 files changed, 50 insertions, 0 deletions
diff --git a/libyul/Utilities.cpp b/libyul/Utilities.cpp
new file mode 100644
index 00000000..e5f4e517
--- /dev/null
+++ b/libyul/Utilities.cpp
@@ -0,0 +1,50 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * Some useful snippets for the optimiser.
+ */
+
+#include <libyul/Utilities.h>
+
+#include <libyul/AsmData.h>
+#include <libyul/Exceptions.h>
+
+#include <libdevcore/CommonData.h>
+
+using namespace std;
+using namespace dev;
+using namespace yul;
+
+u256 yul::valueOfNumberLiteral(Literal const& _literal)
+{
+	assertThrow(_literal.kind == LiteralKind::Number, OptimizerException, "");
+	std::string const& literalString = _literal.value.str();
+	assertThrow(isValidDecimal(literalString) || isValidHex(literalString), OptimizerException, "");
+	return u256(literalString);
+}
+
+template<>
+bool Less<Literal>::operator()(Literal const& _lhs, Literal const& _rhs) const
+{
+	if (std::make_tuple(_lhs.kind, _lhs.type) != std::make_tuple(_rhs.kind, _rhs.type))
+		return std::make_tuple(_lhs.kind, _lhs.type) < std::make_tuple(_rhs.kind, _rhs.type);
+
+	if (_lhs.kind == LiteralKind::Number)
+		return valueOfNumberLiteral(_lhs) < valueOfNumberLiteral(_rhs);
+	else
+		return _lhs.value < _rhs.value;
+}