1 /* 2 * Copyright (c) 2017, 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 8190375 27 * @summary Bad range for IV phi when exit condition is a not equal test 28 * @run main/othervm -XX:-TieredCompilation TestCountedLoopBadIVRange 29 * 30 */ 31 32 33 public class TestCountedLoopBadIVRange { 34 35 static int test1(int[] arr) { 36 int j = 0; 37 int res = 0; 38 for (int i = 0; i < 2; i++) { 39 // When entered with j == 10, exit condition never 40 // succeeds so range of values for j can't be computed 41 // from exit condition 42 for (; j != 5; j++) { 43 if (j >= 20) { 44 break; 45 } 46 res += arr[j]; 47 } 48 j = 10; 49 } 50 return res; 51 } 52 53 static int test2(int[] arr) { 54 int j = 10; 55 int res = 0; 56 for (int i = 0; i < 2; i++) { 57 // Same as above but loop variable is decreasing 58 for (; j != 5; j--) { 59 if (j < 0) { 60 break; 61 } 62 res += arr[j]; 63 } 64 j = 1; 65 } 66 return res; 67 } 68 69 public static void main(String[] args) { 70 int[] arr = new int[20]; 71 for (int i = 0; i < arr.length; i++) { 72 arr[i] = i; 73 } 74 for (int i = 0; i < 20_000; i++) { 75 int res = test1(arr); 76 if (res != 155) { 77 throw new RuntimeException("Incorrect result " + res); 78 } 79 res = test2(arr); 80 if (res != 41) { 81 throw new RuntimeException("Incorrect result " + res); 82 } 83 } 84 } 85 }