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