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annotate test/compiler/loopopts/CountedLoopProblem.java @ 24225:a2dbb6fcc923

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Added tag jvmci-0.33 for changeset 3aed4cb813f4
author Doug Simon <doug.simon@oracle.com>
date Fri, 18 Aug 2017 22:47:33 +0200
parents 8c791dd1c24d
children
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1 /*
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2 * Copyright (c) 2015, 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 8072753
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28 * @summary Inner loop induction variable increment occurs before compare which causes integer overflow
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29 * @run main/othervm CountedLoopProblem
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30 *
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31 */
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32
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33 import java.util.*;
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34
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35 public class CountedLoopProblem {
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36 public static void main(String[] args) throws Exception {
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37 Random r = new Random(42);
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38 int x = 0;
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39 try {
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40 StringBuilder sb = new StringBuilder();
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41 for(int i = 0; i < 1000000; ++i) {
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42 int v = Math.abs(r.nextInt());
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43 sb.append('+').append(v).append('\n');
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44 x += v;
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45 // To trigger the problem we must OSR in the following loop
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46 // To make the problem 100% reproducible run with -XX:-TieredCompilation -XX:OSROnlyBCI=62
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47 while(x < 0) x += 1000000000;
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48 sb.append('=').append(x).append('\n');
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49 }
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50 if (sb.toString().hashCode() != 0xaba94591) {
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51 throw new Exception("Unexpected result");
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52 }
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53 } catch(OutOfMemoryError e) {
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54 // small heap, ignore
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55 }
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56 }
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57 }
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