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3788
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 /**
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26 * @test
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27 * @bug 7044738
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28 * @summary Loop unroll optimization causes incorrect result
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29 *
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30 * @run main/othervm -Xbatch Test7044738
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31 */
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32
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33 public class Test7044738 {
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34
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35 private static final int INITSIZE = 10000;
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36 public int d[] = { 1, 2, 3, 4 };
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37 public int i, size;
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38
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39 private static int iter = 5;
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40
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41 boolean done() { return (--iter > 0); }
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42
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43 public static void main(String args[]) {
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44 Test7044738 t = new Test7044738();
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45 t.test();
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46 }
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47
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48 int test() {
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49
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50 while (done()) {
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51 size = INITSIZE;
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52
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53 for (i = 0; i < size; i++) {
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54 d[0] = d[1]; // 2
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55 d[1] = d[2]; // 3
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56 d[2] = d[3]; // 4
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57 d[3] = d[0]; // 2
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58
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59 d[0] = d[1]; // 3
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60 d[1] = d[2]; // 4
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61 d[2] = d[3]; // 2
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62 d[3] = d[0]; // 3
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63
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64 d[0] = d[1]; // 4
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65 d[1] = d[2]; // 2
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66 d[2] = d[3]; // 3
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67 d[3] = d[0]; // 4
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68
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69 d[0] = d[1]; // 2
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70 d[1] = d[2]; // 3
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71 d[2] = d[3]; // 4
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72 d[3] = d[0]; // 2
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73
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74 d[0] = d[1]; // 3
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75 d[1] = d[2]; // 4
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76 d[2] = d[3]; // 2
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77 d[3] = d[0]; // 3
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78
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79 d[0] = d[1]; // 4
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80 d[1] = d[2]; // 2
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81 d[2] = d[3]; // 3
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82 d[3] = d[0]; // 4
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83
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84 d[0] = d[1]; // 2
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85 d[1] = d[2]; // 3
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86 d[2] = d[3]; // 4
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87 d[3] = d[0]; // 2
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88
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89 d[0] = d[1]; // 3
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90 d[1] = d[2]; // 4
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91 d[2] = d[3]; // 2
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92 d[3] = d[0]; // 3
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93 }
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94
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95 // try to defeat dead code elimination
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96 if (d[0] == d[1]) {
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97 System.out.println("test failed: iter=" + iter + " i=" + i + " d[] = { " + d[0] + ", " + d[1] + ", " + d[2] + ", " + d[3] + " } ");
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98 System.exit(97);
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99 }
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100 }
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101 return d[3];
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102 }
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103
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104 }
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