--- /dev/null 2015-04-28 16:14:11.867039931 +0200 +++ new/test/compiler/arraycopy/TestLoadBypassArrayCopy.java 2015-06-12 14:28:01.914855632 +0200 @@ -0,0 +1,71 @@ +/* + * 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. + * + * 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 + * @bug 8086046 + * @summary load bypasses arraycopy that sets the value after the ArrayCopyNode is expanded + * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:CompileCommand=dontinline,TestLoadBypassArrayCopy::test_helper -XX:-TieredCompilation TestLoadBypassArrayCopy + * + */ + +public class TestLoadBypassArrayCopy { + + static long i; + static boolean test_helper() { + i++; + if ((i%10) == 0) { + return false; + } + return true; + } + + static int test(int[] src, int len, boolean flag) { + int[] dest = new int[10]; + int res = 0; + while (test_helper()) { + System.arraycopy(src, 0, dest, 0, len); + // predicate moved out of loop so control of following + // load is not the ArrayCopyNode. Otherwise, if the memory + // of the load is changed and the control is set to the + // ArrayCopyNode the graph is unschedulable and the test + // doesn't fail. + if (flag) { + } + // The memory of this load shouldn't bypass the arraycopy + res = dest[0]; + } + return res; + } + + static public void main(String[] args) { + int[] src = new int[10]; + src[0] = 0x42; + for (int i = 0; i < 20000; i++) { + int res = test(src, 10, false); + if (res != src[0]) { + throw new RuntimeException("test failed"); + } + } + } +}