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 8078426 27 * @summary split if finds predicates on several incoming paths when unswitched's loops are optimized out 28 * 29 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseOnStackReplacement 30 * -XX:-BackgroundCompilation -XX:-UseCompressedOops 31 * compiler.loopopts.TestSplitIfUnswitchedLoopsEliminated 32 */ 33 34 package compiler.loopopts; 35 36 public class TestSplitIfUnswitchedLoopsEliminated { 37 38 static class A { 39 int f; 40 } 41 42 static A aa = new A(); 43 static A aaa = new A(); 44 test_helper(int stop, boolean unswitch)45 static int test_helper(int stop, boolean unswitch) { 46 A a = null; 47 for (int i = 3; i < 10; i++) { 48 if (unswitch) { 49 a = null; 50 } else { 51 a = aa; 52 int v = a.f; 53 } 54 } 55 if (stop != 4) { 56 a = aaa; 57 } 58 if (a != null) { 59 return a.f; 60 } 61 return 0; 62 } 63 test(boolean unswitch)64 static int test(boolean unswitch) { 65 int stop = 1; 66 for (; stop < 3; stop *= 4) { 67 } 68 return test_helper(stop, unswitch); 69 } 70 main(String[] args)71 public static void main(String[] args) { 72 for (int i = 0; i < 20000; i++) { 73 test_helper(10, i%2 == 0); 74 test(i%2 == 0); 75 } 76 } 77 } 78