1 /* 2 * Copyright (c) 2019, 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 8231550 27 * @summary C2: ShouldNotReachHere() in verify_strip_mined_scheduling 28 * 29 * @run main/othervm -XX:-BackgroundCompilation -XX:LoopMaxUnroll=0 TestConservativeAntiDep 30 * 31 */ 32 33 import java.lang.reflect.Array; 34 import java.util.Arrays; 35 36 public class TestConservativeAntiDep { 37 private static long longField; 38 main(String[] args)39 public static void main(String[] args) throws InstantiationException, IllegalAccessException { 40 for (int i = 0; i < 20_000; i++) { 41 test1(A.class); 42 test2(B.class); 43 } 44 } 45 test1(Class klass)46 private static int test1(Class klass) { 47 Object[] in = (Object[])Array.newInstance(klass, 100); 48 49 Object[] o = in; 50 int v = 1; 51 // CountedLoop has control dependent CastPP 52 for (int i = 0; i < 100 ; i++) { 53 longField = i; // sunk in outer strip mined loop 54 o = (A[]) o; 55 v *= 2; 56 } 57 58 // LoadRange cannot float higher than CountedLoop (because of 59 // CastPP) and is found anti-dependent with long store so 60 // scheduled in outer strip mined loop 61 return v + o.length; 62 } 63 test2(Class klass)64 private static int test2(Class klass) throws IllegalAccessException, InstantiationException { 65 A in = (A)klass.newInstance(); 66 67 A o = in; 68 int v = 1; 69 // CountedLoop has control dependent CastPP 70 for (int i = 0; i < 100 ; i++) { 71 longField = i; // sunk in outer strip mined loop 72 o = (B) o; 73 v *= 2; 74 } 75 76 // Load cannot float higher than CountedLoop (because of 77 // CastPP) and is found anti-dependent with long store so 78 // scheduled in outer strip mined loop 79 return v + o.intField; 80 } 81 82 private static class A { 83 int intField; A()84 public A() {} 85 } 86 87 private static class B extends A { B()88 public B() {} 89 } 90 } 91