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 * @test 26 * @bug 7044738 27 * @summary Loop unroll optimization causes incorrect result 28 * 29 * @run main/othervm -Xbatch compiler.loopopts.Test7044738 30 */ 31 32package compiler.loopopts; 33 34public class Test7044738 { 35 36 private static final int INITSIZE = 10000; 37 public int d[] = {1, 2, 3, 4}; 38 public int i, size; 39 40 private static int iter = 5; 41 42 boolean done() { 43 return (--iter > 0); 44 } 45 46 public static void main(String args[]) { 47 Test7044738 t = new Test7044738(); 48 t.test(); 49 } 50 51 int test() { 52 53 while (done()) { 54 size = INITSIZE; 55 56 for (i = 0; i < size; i++) { 57 d[0] = d[1]; // 2 58 d[1] = d[2]; // 3 59 d[2] = d[3]; // 4 60 d[3] = d[0]; // 2 61 62 d[0] = d[1]; // 3 63 d[1] = d[2]; // 4 64 d[2] = d[3]; // 2 65 d[3] = d[0]; // 3 66 67 d[0] = d[1]; // 4 68 d[1] = d[2]; // 2 69 d[2] = d[3]; // 3 70 d[3] = d[0]; // 4 71 72 d[0] = d[1]; // 2 73 d[1] = d[2]; // 3 74 d[2] = d[3]; // 4 75 d[3] = d[0]; // 2 76 77 d[0] = d[1]; // 3 78 d[1] = d[2]; // 4 79 d[2] = d[3]; // 2 80 d[3] = d[0]; // 3 81 82 d[0] = d[1]; // 4 83 d[1] = d[2]; // 2 84 d[2] = d[3]; // 3 85 d[3] = d[0]; // 4 86 87 d[0] = d[1]; // 2 88 d[1] = d[2]; // 3 89 d[2] = d[3]; // 4 90 d[3] = d[0]; // 2 91 92 d[0] = d[1]; // 3 93 d[1] = d[2]; // 4 94 d[2] = d[3]; // 2 95 d[3] = d[0]; // 3 96 } 97 98 // try to defeat dead code elimination 99 if (d[0] == d[1]) { 100 System.out.println("test failed: iter=" + iter + " i=" + i + " d[] = { " + d[0] + ", " + d[1] + ", " + d[2] + ", " + d[3] + " } "); 101 System.exit(97); 102 } 103 } 104 return d[3]; 105 } 106} 107