--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/classfile/altHashing.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_CLASSFILE_ALTHASHING_HPP
+#define SHARE_VM_CLASSFILE_ALTHASHING_HPP
+
+#include "prims/jni.h"
+#include "classfile/symbolTable.hpp"
+
+/**
+ * Hashing utilities.
+ *
+ * Implementation of Murmur3 hashing.
+ * This code was translated from src/share/classes/sun/misc/Hashing.java
+ * code in the JDK.
+ */
+
+class AltHashing : AllStatic {
+  friend class AltHashingTest;
+
+  // utility function copied from java/lang/Integer
+  static juint Integer_rotateLeft(juint i, int distance) {
+    return (i << distance) | (i >> (32 - distance));
+  }
+  static juint murmur3_32(const int* data, int len);
+  static juint murmur3_32(juint seed, const int* data, int len);
+
+ public:
+  static juint compute_seed();
+  static juint murmur3_32(juint seed, const jbyte* data, int len);
+  static juint murmur3_32(juint seed, const jchar* data, int len);
+};
+#endif // SHARE_VM_CLASSFILE_ALTHASHING_HPP