60 lines
1.8 KiB
Java
60 lines
1.8 KiB
Java
/*
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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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* @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 compiler.c2.Test6897150
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*/
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package compiler.c2;
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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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