| /* |
| * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8240227 |
| * @summary Test different cases of overunrolling the main loop of unswitched loops (pre/main/post) which are then not entered. |
| * @run main/othervm -XX:CompileCommand=compileonly,compiler.loopopts.TestUnswitchOverunrolling::test* |
| * -Xcomp -Xbatch -XX:-TieredCompilation compiler.loopopts.TestUnswitchOverunrolling |
| * @run main/othervm -XX:CompileCommand=compileonly,compiler.loopopts.TestUnswitchOverunrolling::* |
| * -Xcomp -Xbatch -XX:-TieredCompilation compiler.loopopts.TestUnswitchOverunrolling |
| */ |
| |
| package compiler.loopopts; |
| |
| public class TestUnswitchOverunrolling { |
| |
| public static int v = 1; |
| public static int w = 2; |
| public static int x = 3; |
| public static int y = 4; |
| public static int z = 5; |
| |
| // The inner for-loop is unswitched and pre-main-post loops are created for both unswitched loop versions. |
| // Afterwards, both main loops are over-unrolled and vectorized resulting in a crash in the matcher because |
| // the memory input to a vector is top. |
| public static int test(int[] array) { |
| int result = 0; |
| int[] iArr = new int[8]; |
| for (int i = 0; i < array.length; i++) { |
| for (int j = 5; j < i; j++) { |
| if (x == 42) { |
| y = 34; |
| } |
| iArr[j] += array[j]; |
| result += array[j]; |
| } |
| } |
| return result; |
| } |
| |
| // Test with additional null check predicates for objects |
| public static int test2(int[] array, A a, A a2) { |
| int result = 0; |
| int[] iArr = new int[8]; |
| for (int i = 0; i < array.length; i++) { |
| for (int j = 5; j < i; j++) { |
| y = a2.iFld; |
| if (x == 42) { |
| y = 34; |
| } |
| z = a.iFld; |
| iArr[j] += array[j]; |
| result += array[j]; |
| } |
| } |
| return result; |
| } |
| |
| // Test with two conditions (unswitch twice) and additional null check predicates for objects |
| public static int testUnswitchTwice(int[] array, A a, A a2, A a3) { |
| int result = 0; |
| int[] iArr = new int[8]; |
| for (int i = 0; i < array.length; i++) { |
| for (int j = 5; j < i; j++) { |
| y = a2.iFld; |
| if (x == 42) { |
| y = 34; |
| } |
| z = a.iFld; |
| if (w == 22) { |
| y = 55; |
| } |
| v = a3.iFld; |
| iArr[j] += array[j]; |
| result += array[j]; |
| } |
| } |
| return result; |
| } |
| |
| // Test with three conditions (unswitch three times) and additional null check predicates for objects |
| public static int testUnswitchThreeTimes(int[] array, A a, A a2, A a3) { |
| int result = 0; |
| int[] iArr = new int[8]; |
| for (int i = 0; i < array.length; i++) { |
| for (int j = 5; j < i; j++) { |
| y += a2.iFld; |
| if (x == 42) { |
| y = 34; |
| } |
| if (w == 22) { |
| y = 55; |
| } |
| v = a3.iFld; |
| if (z == 75) { |
| y = 66; |
| } |
| y += a.iFld + a2.iFld + a3.iFld; |
| iArr[j] += array[j]; |
| result += array[j]; |
| } |
| } |
| return result; |
| } |
| |
| public static void main(String args[]) { |
| int[] array = new int[8]; |
| for (int i = 0; i < array.length; i++) { |
| array[i] = i + 1; |
| } |
| |
| check(test(array), 1, 2, 3, 4, 5); |
| check(test2(array, new A(), new A()), 1, 2, 3, 6, 6); |
| check(testUnswitchTwice(array, new A(), new A(), new A()), 6, 2, 3, 6, 6); |
| check(testUnswitchThreeTimes(array, new A(), new A(), new A()), 6, 2, 3, 78, 6); |
| |
| for (int i = 0; i < array.length; i++) { |
| if (array[i] != i + 1) { |
| throw new RuntimeException("array values should not change"); |
| } |
| } |
| } |
| |
| public static void check(int result, int expV, int expW, int expX, int expY, int expZ) { |
| if (result != 19 || expV != v || expW != w || expX != x || expY != y || expZ != z) { |
| throw new RuntimeException("wrong execution"); |
| } |
| } |
| } |
| |
| class A { |
| int iFld = 6; |
| } |
| |