--- /dev/null 2016-02-24 18:57:13.000000000 +0300 +++ new/test/compiler/unsafe/UnsafeGetStableArrayElement.java 2016-02-24 18:57:13.000000000 +0300 @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2015, 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. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * 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. + */ + +/* + * @test + * @summary tests on constant folding of unsafe get operations + * @library /testlibrary /test/lib + * + * @run main/bootclasspath -XX:+UnlockDiagnosticVMOptions + * -Xbatch -XX:-TieredCompilation + * -XX:+FoldStableValues + * UnsafeGetStableArrayElement + * + * @run main/bootclasspath -XX:+UnlockDiagnosticVMOptions + * -Xbatch -XX:+TieredCompilation -XX:TieredStopAtLevel=1 + * -XX:+FoldStableValues + * UnsafeGetStableArrayElement + */ +import jdk.internal.misc.Unsafe; +import jdk.internal.vm.annotation.Stable; +import java.util.concurrent.Callable; + +import static jdk.internal.misc.Unsafe.*; +import static jdk.test.lib.Asserts.*; + +public class UnsafeGetStableArrayElement { + @Stable static final byte[] STABLE_BYTE_ARRAY = new byte[] { 0, 1, -128, 127}; + + static final Unsafe U = Unsafe.getUnsafe(); + + static int testChar() { + return U.getChar(STABLE_BYTE_ARRAY, ARRAY_BYTE_BASE_OFFSET + 0 * ARRAY_CHAR_INDEX_SCALE) + + U.getChar(STABLE_BYTE_ARRAY, ARRAY_BYTE_BASE_OFFSET + 1 * ARRAY_CHAR_INDEX_SCALE); + } + + static void run(Callable c) throws Exception { + Object first = c.call(); + for (int i = 0; i < 20_000; i++) { + assertEQ(first, c.call()); + } + } + + public static void main(String[] args) throws Exception { + run(UnsafeGetStableArrayElement::testChar); + } +}