Mercurial > hg > graal-jvmci-8
view test/compiler/loopopts/CountedLoopProblem.java @ 23567:2a2720daacaa jdk8u76-b03
Merge
author | asaha |
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date | Fri, 15 Jan 2016 16:21:59 -0800 |
parents | 0a5d68482373 |
children | 8c791dd1c24d |
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/* * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ /** * @test * @bug 8072753 * @summary Inner loop induction variable increment occurs before compare which causes integer overflow * @run main/othervm CountedLoopProblem * */ import java.util.*; public class CountedLoopProblem { public static void main(String[] args) throws Exception { Random r = new Random(42); int x = 0; StringBuilder sb = new StringBuilder(); for(int i = 0; i < 1000000; ++i) { int v = Math.abs(r.nextInt()); sb.append('+').append(v).append('\n'); x += v; // To trigger the problem we must OSR in the following loop // To make the problem 100% reproducible run with -XX:-TieredCompilation -XX:OSROnlyBCI=62 while(x < 0) x += 1000000000; sb.append('=').append(x).append('\n'); } if (sb.toString().hashCode() != 0xaba94591) { throw new Exception("Unexpected result"); } } }