60 lines
2.2 KiB
Java
60 lines
2.2 KiB
Java
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8072753
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* @summary Inner loop induction variable increment occurs before compare which causes integer overflow
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* @run main/othervm compiler.loopopts.CountedLoopProblem
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*
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*/
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package compiler.loopopts;
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import java.util.Random;
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public class CountedLoopProblem {
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public static void main(String[] args) throws Exception {
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Random r = new Random(42);
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int x = 0;
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try {
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StringBuilder sb = new StringBuilder();
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for(int i = 0; i < 1000000; ++i) {
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int v = Math.abs(r.nextInt());
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sb.append('+').append(v).append('\n');
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x += v;
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// To trigger the problem we must OSR in the following loop
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// To make the problem 100% reproducible run with -XX:-TieredCompilation -XX:OSROnlyBCI=62
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while(x < 0) x += 1000000000;
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sb.append('=').append(x).append('\n');
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}
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if (sb.toString().hashCode() != 0xaba94591) {
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throw new Exception("Unexpected result");
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}
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} catch(OutOfMemoryError e) {
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// small heap, ignore
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}
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}
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}
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