TestSplitIfUnswitchedLoopsEliminated.java revision 8294:030e40746a11
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 8078426 28 * @summary split if finds predicates on several incoming paths when unswitched's loops are optimized out 29 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-UseCompressedOops TestSplitIfUnswitchedLoopsEliminated 30 * 31 */ 32 33 34public class TestSplitIfUnswitchedLoopsEliminated { 35 36 static class A { 37 int f; 38 } 39 40 static A aa = new A(); 41 static A aaa = new A(); 42 43 static int test_helper(int stop, boolean unswitch) { 44 A a = null; 45 for (int i = 3; i < 10; i++) { 46 if (unswitch) { 47 a = null; 48 } else { 49 a = aa; 50 int v = a.f; 51 } 52 } 53 if (stop != 4) { 54 a = aaa; 55 } 56 if (a != null) { 57 return a.f; 58 } 59 return 0; 60 } 61 62 static int test(boolean unswitch) { 63 int stop = 1; 64 for (; stop < 3; stop *= 4) { 65 } 66 return test_helper(stop, unswitch); 67 } 68 69 public static void main(String[] args) { 70 for (int i = 0; i < 20000; i++) { 71 test_helper(10, i%2 == 0); 72 test(i%2 == 0); 73 } 74 } 75} 76