--- /dev/null 2018-04-03 12:55:20.301839954 +0200 +++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZHash.java 2018-06-01 22:31:19.715568852 +0200 @@ -0,0 +1,41 @@ +/* + * Copyright (c) 2017, 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. + * + */ + +package sun.jvm.hotspot.gc.z; + +class ZHash { + private static long uint32(long value) { + return value & 0xFFFFFFFFL; + } + + static long uint32_to_uint32(long key) { + key = uint32(~key + (key << 15)); + key = uint32(key ^ (key >> 12)); + key = uint32(key + (key << 2)); + key = uint32(key ^ (key >> 4)); + key = uint32(key * 2057); + key = uint32(key ^ (key >> 16)); + return key; + } +}