test/compiler/5091921/Test6905845.java

/*
 * Copyright (c) 2011, 2013, 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
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 * questions.
 *
 */

/**
 * @test
 * @bug 6905845
 * @summary Server VM improperly optimizing away loop.
 *
 * @run main/timeout=480 Test6905845
 */

public class Test6905845 {

   public static void main(String[] args){
      for (int asdf = 0; asdf < 5; asdf++){
         //test block
         {
            StringBuilder strBuf1 = new StringBuilder(65);
            long          start   = System.currentTimeMillis();
            int           count   = 0;

            for (int i = Integer.MIN_VALUE; i < (Integer.MAX_VALUE - 80); i += 79){
               strBuf1.append(i);
               count++;
               strBuf1.delete(0, 65);
            }

            System.out.println(count);
            if (count != 54366674) {
              System.out.println("wrong count: " + count +", should be 54366674");
              System.exit(97);
            }
         }
         //test block
         {
            StringBuilder strBuf1 = new StringBuilder(65);
            long          start   = System.currentTimeMillis();
            int           count   = 0;

            for (int i = Integer.MIN_VALUE; i < (Integer.MAX_VALUE - 80); i += 79){
               strBuf1.append(i);
               count++;
               strBuf1.delete(0, 65);
            }

            System.out.println(count);
            if (count != 54366674) {
              System.out.println("wrong count: " + count +", should be 54366674");
              System.exit(97);
            }
         }
      }
   }
}