1 /* 2 * Copyright (c) 2020, Huawei Technologies Co. Ltd. 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 8243670 27 * @summary Unexpected test result caused by C2 MergeMemNode::Ideal 28 * 29 * @run main/othervm -Xcomp -XX:-SplitIfBlocks 30 * -XX:CompileOnly=compiler.c2.TestReplaceEquivPhis::test 31 * -XX:-BackgroundCompilation compiler.c2.TestReplaceEquivPhis 32 */ 33 34 package compiler.c2; 35 36 public class TestReplaceEquivPhis { 37 38 public static final int N = 400; 39 public static volatile int instanceCount = 0; 40 public int iFld = 0; 41 public static int iArrFld[] = new int[N]; 42 test()43 public int test() { 44 int v = 0; 45 boolean bArr[] = new boolean[N]; 46 47 for (int i = 1; i < 344; i++) { 48 iFld = i; 49 for (int j = 2; j <177 ; j++) { 50 v = iFld; 51 iFld = TestReplaceEquivPhis.instanceCount; 52 TestReplaceEquivPhis.iArrFld[i] = 0; 53 iFld += TestReplaceEquivPhis.instanceCount; 54 TestReplaceEquivPhis.iArrFld[i] = 0; 55 bArr[j] = false; 56 TestReplaceEquivPhis.instanceCount = 1; 57 58 for (int k = 1; k < 3; k++) { 59 // do nothing 60 } 61 } 62 } 63 return v; 64 } 65 main(String[] args)66 public static void main(String[] args) { 67 TestReplaceEquivPhis obj = new TestReplaceEquivPhis(); 68 for (int i = 0; i < 5; i++) { 69 int result = obj.test(); 70 if (result != 2) { 71 throw new RuntimeException("Test failed."); 72 } 73 } 74 System.out.println("Test passed."); 75 } 76 77 } 78