1 /* 2 * Copyright (c) 2020, 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 8240227 27 * @summary Test different cases of overunrolling the main loop of unswitched loops (pre/main/post) which are then not entered. 28 * @run main/othervm -XX:CompileCommand=compileonly,compiler.loopopts.TestUnswitchOverunrolling::test* 29 * -Xcomp -Xbatch -XX:-TieredCompilation compiler.loopopts.TestUnswitchOverunrolling 30 * @run main/othervm -XX:CompileCommand=compileonly,compiler.loopopts.TestUnswitchOverunrolling::* 31 * -Xcomp -Xbatch -XX:-TieredCompilation compiler.loopopts.TestUnswitchOverunrolling 32 */ 33 34 package compiler.loopopts; 35 36 public class TestUnswitchOverunrolling { 37 38 public static int v = 1; 39 public static int w = 2; 40 public static int x = 3; 41 public static int y = 4; 42 public static int z = 5; 43 44 // The inner for-loop is unswitched and pre-main-post loops are created for both unswitched loop versions. 45 // Afterwards, both main loops are over-unrolled and vectorized resulting in a crash in the matcher because 46 // the memory input to a vector is top. test(int[] array)47 public static int test(int[] array) { 48 int result = 0; 49 int[] iArr = new int[8]; 50 for (int i = 0; i < array.length; i++) { 51 for (int j = 5; j < i; j++) { 52 if (x == 42) { 53 y = 34; 54 } 55 iArr[j] += array[j]; 56 result += array[j]; 57 } 58 } 59 return result; 60 } 61 62 // Test with additional null check predicates for objects test2(int[] array, A a, A a2)63 public static int test2(int[] array, A a, A a2) { 64 int result = 0; 65 int[] iArr = new int[8]; 66 for (int i = 0; i < array.length; i++) { 67 for (int j = 5; j < i; j++) { 68 y = a2.iFld; 69 if (x == 42) { 70 y = 34; 71 } 72 z = a.iFld; 73 iArr[j] += array[j]; 74 result += array[j]; 75 } 76 } 77 return result; 78 } 79 80 // Test with two conditions (unswitch twice) and additional null check predicates for objects testUnswitchTwice(int[] array, A a, A a2, A a3)81 public static int testUnswitchTwice(int[] array, A a, A a2, A a3) { 82 int result = 0; 83 int[] iArr = new int[8]; 84 for (int i = 0; i < array.length; i++) { 85 for (int j = 5; j < i; j++) { 86 y = a2.iFld; 87 if (x == 42) { 88 y = 34; 89 } 90 z = a.iFld; 91 if (w == 22) { 92 y = 55; 93 } 94 v = a3.iFld; 95 iArr[j] += array[j]; 96 result += array[j]; 97 } 98 } 99 return result; 100 } 101 102 // Test with three conditions (unswitch three times) and additional null check predicates for objects testUnswitchThreeTimes(int[] array, A a, A a2, A a3)103 public static int testUnswitchThreeTimes(int[] array, A a, A a2, A a3) { 104 int result = 0; 105 int[] iArr = new int[8]; 106 for (int i = 0; i < array.length; i++) { 107 for (int j = 5; j < i; j++) { 108 y += a2.iFld; 109 if (x == 42) { 110 y = 34; 111 } 112 if (w == 22) { 113 y = 55; 114 } 115 v = a3.iFld; 116 if (z == 75) { 117 y = 66; 118 } 119 y += a.iFld + a2.iFld + a3.iFld; 120 iArr[j] += array[j]; 121 result += array[j]; 122 } 123 } 124 return result; 125 } 126 main(String args[])127 public static void main(String args[]) { 128 int[] array = new int[8]; 129 for (int i = 0; i < array.length; i++) { 130 array[i] = i + 1; 131 } 132 133 check(test(array), 1, 2, 3, 4, 5); 134 check(test2(array, new A(), new A()), 1, 2, 3, 6, 6); 135 check(testUnswitchTwice(array, new A(), new A(), new A()), 6, 2, 3, 6, 6); 136 check(testUnswitchThreeTimes(array, new A(), new A(), new A()), 6, 2, 3, 78, 6); 137 138 for (int i = 0; i < array.length; i++) { 139 if (array[i] != i + 1) { 140 throw new RuntimeException("array values should not change"); 141 } 142 } 143 } 144 check(int result, int expV, int expW, int expX, int expY, int expZ)145 public static void check(int result, int expV, int expW, int expX, int expY, int expZ) { 146 if (result != 19 || expV != v || expW != w || expX != x || expY != y || expZ != z) { 147 throw new RuntimeException("wrong execution"); 148 } 149 } 150 } 151 152 class A { 153 int iFld = 6; 154 } 155 156