hotspot/test/compiler/5091921/Test6897150.java
author prr
Thu, 25 Apr 2013 16:49:54 -0700
changeset 18254 e4083179f1c9
parent 9446 748a37b25d10
permissions -rw-r--r--
8012421: Better positioning of PairPositioning Reviewed-by: srl, mschoene, vadim
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/*
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 * Copyright (c) 2011, 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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/**
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 * @test
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 * @bug 6897150
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 * @summary Hotspot optimises away a valid loop
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 *
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 * @run main Test6897150
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 */
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// Should be compiled with javac from JDK1.3 to get bytecode which shows the problem.
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public class Test6897150 {
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    public static void main(String[] args) {
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        // This works
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        loopAndPrint(Integer.MAX_VALUE -1);
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        // This doesn't
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        loopAndPrint(Integer.MAX_VALUE);
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    }
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    static void verify(int max, int a) {
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        if ( a != (max - 1)) {
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            System.out.println("Expected: " + (max - 1));
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            System.out.println("Actual  : " + a);
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            System.exit(97);
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        }
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    }
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    static void loopAndPrint(int max) {
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        int a = -1;
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        int i = 1;
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        for (; i < max; i++) {
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            a = i;
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        }
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        verify(max, a);
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    }
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}
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