1 /* 2 * Copyright (c) 2011, 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 /** 26 * @test 27 * @bug 7044738 28 * @summary Loop unroll optimization causes incorrect result 29 * 30 * @run main/othervm -Xbatch Test7044738 31 */ 32 33 public class Test7044738 { 34 35 private static final int INITSIZE = 10000; 36 public int d[] = { 1, 2, 3, 4 }; 37 public int i, size; 38 39 private static int iter = 5; 40 41 boolean done() { return (--iter > 0); } 42 43 public static void main(String args[]) { 44 Test7044738 t = new Test7044738(); 45 t.test(); 46 } 47 48 int test() { 49 50 while (done()) { 51 size = INITSIZE; 52 53 for (i = 0; i < size; i++) { 54 d[0] = d[1]; // 2 55 d[1] = d[2]; // 3 56 d[2] = d[3]; // 4 57 d[3] = d[0]; // 2 58 59 d[0] = d[1]; // 3 60 d[1] = d[2]; // 4 61 d[2] = d[3]; // 2 62 d[3] = d[0]; // 3 63 64 d[0] = d[1]; // 4 65 d[1] = d[2]; // 2 66 d[2] = d[3]; // 3 67 d[3] = d[0]; // 4 68 69 d[0] = d[1]; // 2 70 d[1] = d[2]; // 3 71 d[2] = d[3]; // 4 72 d[3] = d[0]; // 2 73 74 d[0] = d[1]; // 3 75 d[1] = d[2]; // 4 76 d[2] = d[3]; // 2 77 d[3] = d[0]; // 3 78 79 d[0] = d[1]; // 4 80 d[1] = d[2]; // 2 81 d[2] = d[3]; // 3 82 d[3] = d[0]; // 4 83 84 d[0] = d[1]; // 2 85 d[1] = d[2]; // 3 86 d[2] = d[3]; // 4 87 d[3] = d[0]; // 2 88 89 d[0] = d[1]; // 3 90 d[1] = d[2]; // 4 91 d[2] = d[3]; // 2 92 d[3] = d[0]; // 3 93 } 94 95 // try to defeat dead code elimination 96 if (d[0] == d[1]) { 97 System.out.println("test failed: iter=" + iter + " i=" + i + " d[] = { " + d[0] + ", " + d[1] + ", " + d[2] + ", " + d[3] + " } "); 98 System.exit(97); 99 } 100 } 101 return d[3]; 102 } 103 104 }