1 /* 2 * Copyright (c) 2021, 2024, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 8275276 27 * @summary Test loop unswitching with flat array checks. 28 * @enablePreview 29 * @run main/othervm -Xcomp -XX:CompileCommand=compileonly,TestLoopUnswitchingWithFlatArrayCheck::test TestLoopUnswitchingWithFlatArrayCheck 30 */ 31 32 public class TestLoopUnswitchingWithFlatArrayCheck { 33 34 Object[] objectArray = new Object[1000]; 35 36 boolean test(Object o) { 37 return false; 38 } 39 40 private Object test(int start, int end) { 41 Object res = null; 42 Object[] array = objectArray; 43 if (array == null) { 44 return null; 45 } 46 for (int i = start; ; i++) { 47 if (test(array[i])) { 48 continue; 49 } 50 if (i == end) { 51 break; 52 } 53 } 54 for (int i = 0; i < 100; i++) { 55 for (; i < 100; i++) { 56 res = array[i]; 57 } 58 } 59 return res; 60 } 61 62 public static void main(String[] args) { 63 TestLoopUnswitchingWithFlatArrayCheck t = new TestLoopUnswitchingWithFlatArrayCheck(); 64 t.test(0, 10); 65 } 66 }