1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 8181872
  27  *
  28  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions
  29  *                   -XX:CompileThreshold=100 -XX:+TieredCompilation -XX:TieredStopAtLevel=1
  30  *                   -XX:-BackgroundCompilation -XX:CompileCommand=dontinline,compiler.c1.MultiplyByMaxInt::test
  31  *                   compiler.c1.MultiplyByMaxInt
  32  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-BackgroundCompilation
  33  *                   -XX:CompileThreshold=100 -XX:+TieredCompilation -XX:TieredStopAtLevel=3
  34  *                   -XX:CompileCommand=dontinline,compiler.c1.MultiplyByMaxInt::test
  35  *                   compiler.c1.MultiplyByMaxInt
  36  */
  37 package compiler.c1;
  38 
  39 public class MultiplyByMaxInt {
  40     static int test(int x) {
  41         int loops = (x >>> 4) & 7;
  42         while (loops-- > 0) {
  43             x = (x * 2147483647) % 16807;
  44         }
  45         return x;
  46     }
  47 
  48     public static void main(String[] args) {
  49         for (int i = 0; i < 20000; i++) {
  50             test(i);
  51         }
  52     }
  53 }