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 * @test 26 * @bug 8073184 27 * @summary CastII that guards counted loops confuses range check elimination with LoopLimitCheck off 28 * 29 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -Xcomp 30 * -XX:CompileCommand=compileonly,compiler.loopopts.TestCastIINoLoopLimitCheck::m 31 * compiler.loopopts.TestCastIINoLoopLimitCheck 32 */ 33 34 package compiler.loopopts; 35 /* 36 * The test was originally run with 37 * 38 * -XX:+UnlockDiagnosticVMOptions -XX:-LoopLimitCheck 39 * 40 * to trigger a problem with code guarded with !LoopLimitCheck. 41 * JDK-8072422 has removed that code but kept the test because the 42 * test generates an interesting graph shape. 43 */ 44 public class TestCastIINoLoopLimitCheck { 45 m(int i, int index, char[] buf)46 static void m(int i, int index, char[] buf) { 47 while (i >= 65536) { 48 i = i / 100; 49 buf [--index] = 0; 50 buf [--index] = 1; 51 } 52 } 53 main(String[] args)54 static public void main(String[] args) { 55 m(0, 0, null); 56 } 57 } 58