1 /*
   2  * Copyright (c) 2015, 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 /**
  26  * @test
  27  * @bug 8073184
  28  * @summary CastII that guards counted loops confuses range check elimination with LoopLimitCheck off
  29  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:CompileOnly=TestCastIINoLoopLimitCheck.m -Xcomp  TestCastIINoLoopLimitCheck
  30  *
  31  */
  32 
  33 /*
  34  * The test was originally run with
  35  *
  36  * -XX:+UnlockDiagnosticVMOptions -XX:-LoopLimitCheck
  37  *
  38  * to trigger a problem with code guarded with !LoopLimitCheck.
  39  * JDK-8072422 has removed that code but kept the test because the
  40  * test generates an interesting graph shape.
  41  */
  42 public class TestCastIINoLoopLimitCheck {
  43 
  44     static void m(int i, int index, char[] buf) {
  45         while (i >= 65536) {
  46             i = i / 100;
  47             buf [--index] = 0;
  48             buf [--index] = 1;
  49         }
  50     }
  51 
  52     static public void main(String[] args) {
  53         m(0, 0, null);
  54     }
  55 }