1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. 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 8196296
  27  * @summary Bad graph when unrolled loop bounds conflicts with range checks
  28  *
  29  * @run main/othervm -XX:-BackgroundCompilation -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=0 TestStripMinedBackToBackIfs
  30  *
  31  */
  32 
  33 
  34 public class TestStripMinedBackToBackIfs {
  35     public static void main(String[] args) {
  36         for (int i = 0; i < 20_000; i++) {
  37             test(100);
  38         }
  39     }
  40 
  41     private static double test(int limit) {
  42         double v = 1;
  43         for (int i = 0; i < limit; i++) {
  44             v = v * 4;
  45             // We don't want this test to be merged with identical
  46             // loop end test
  47             if (i+1 < limit) {
  48                 v = v * 2;
  49             }
  50         }
  51         return v;
  52     }
  53 }