| /* |
| * Copyright (c) 2018, Red Hat, Inc. 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 8193130 8203915 |
| * @summary Bad graph when unrolled loop bounds conflicts with range checks |
| * @requires vm.flavor == "server" |
| * |
| * @run main/othervm IterationSplitPredicateInconsistency |
| * @run main/othervm -XX:-UseLoopPredicate IterationSplitPredicateInconsistency |
| * @run main/othervm -XX:LoopStripMiningIter=0 IterationSplitPredicateInconsistency |
| * |
| */ |
| |
| public class IterationSplitPredicateInconsistency { |
| static volatile int barrier; |
| |
| // Pollute profile so loop appears to run for a large number of iterations |
| static boolean test1_helper(int start, int stop, double[] array1, double[] array2, int exit) { |
| for (int i = start; i < stop; i++) { |
| array1[i] = array2[i]; |
| if (i == exit) { |
| return true; |
| } |
| barrier = 0x42; |
| } |
| return false; |
| } |
| |
| static double[] test1(int start, double[] array2, int exit) { |
| double[] array1 = new double[10]; |
| // Predication moves range checks out of loop and |
| // pre/main/post loops are created. The main loop is unrolled |
| // several times to the point where it's never executed but |
| // compiler can't tell from the loop bounds alone. The lower |
| // bound of the loop is negative and would cause range checks |
| // (that were removed from the loop body) to fail. |
| if (test1_helper(start, 5, array1, array2, exit)) { |
| return null; |
| } |
| return array1; |
| } |
| |
| // Same as above with other combinations of increasing/decreasing |
| // loops, positive/negative stride |
| static boolean test2_helper(int start, int stop, double[] array1, double[] array2, int exit) { |
| for (int i = start-1; i >= stop; i--) { |
| array1[i] = array2[i]; |
| if (i == exit) { |
| return true; |
| } |
| barrier = 0x42; |
| } |
| return false; |
| } |
| |
| static double[] test2(int start, double[] array2, int exit) { |
| double[] array1 = new double[10]; |
| if (test2_helper(start, 0, array1, array2, exit)) { |
| return null; |
| } |
| return array1; |
| } |
| |
| static boolean test3_helper(int start, int stop, double[] array1, double[] array2, int exit) { |
| for (int i = start; i < stop; i++) { |
| array1[stop-i-1] = array2[stop-i-1]; |
| if (i == exit) { |
| return true; |
| } |
| barrier = 0x42; |
| } |
| return false; |
| } |
| |
| static double[] test3(int start, double[] array2, int exit) { |
| double[] array1 = new double[5]; |
| if (test3_helper(start, 5, array1, array2, exit)) { |
| return null; |
| } |
| return array1; |
| } |
| |
| static boolean test4_helper(int start, int stop, int from, double[] array1, double[] array2, int exit) { |
| for (int i = start-1; i >= stop; i--) { |
| array1[from-i-1] = array2[from-i-1]; |
| if (i == exit) { |
| return true; |
| } |
| barrier = 0x42; |
| } |
| return false; |
| } |
| |
| static double[] test4(int start, double[] array2, int exit) { |
| double[] array1 = new double[5]; |
| if (test4_helper(start, 0, 5, array1, array2, exit)) { |
| return null; |
| } |
| return array1; |
| } |
| |
| public static void main(String[] args) { |
| double[] array2 = new double[10]; |
| double[] array3 = new double[1000]; |
| for (int i = 0; i < 20_000; i++) { |
| test1_helper(0, 1000, array3, array3, 998); |
| test1(0, array2, 999); |
| test1(0, array2, 4); |
| test2_helper(1000, 0, array3, array3, 1); |
| test2(5, array2, 999); |
| test2(5, array2, 1); |
| test3_helper(0, 1000, array3, array3, 998); |
| test3(0, array2, 999); |
| test3(0, array2, 4); |
| test4_helper(1000, 0, 1000, array3, array3, 1); |
| test4(5, array2, 999); |
| test4(5, array2, 1); |
| } |
| } |
| } |