| /* |
| * Copyright (c) 2015, 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 8003585 |
| * @summary strength reduce or eliminate range checks for power-of-two sized arrays |
| * @run main/othervm -XX:CompileCommand=compileonly,PowerOf2SizedArraysChecks::test* -XX:-BackgroundCompilation PowerOf2SizedArraysChecks |
| * |
| */ |
| |
| import java.util.function.*; |
| |
| public class PowerOf2SizedArraysChecks { |
| |
| static void check_result(String name, int x, int m, boolean expected, boolean res) { |
| if (expected != res) { |
| throw new RuntimeException("Bad result in " + name + " for x = " + x + " m = " + m + " expected " + expected + " got " + res); |
| } |
| } |
| |
| static void helper(String name, BiFunction<Integer, int[], Boolean> test, int[] x_values, int[] m_values, boolean[][] expected) { |
| for (int i = 0; i < x_values.length; i++) { |
| int x = x_values[i]; |
| for (int j = 0; j < m_values.length; j++) { |
| int m = m_values[j]; |
| int[] array = new int[m]; |
| boolean res = test.apply(x, array); |
| check_result(name, x, m, expected[i][j], res); |
| } |
| } |
| } |
| |
| static void check_result(String name, int m, boolean expected, boolean res) { |
| if (expected != res) { |
| throw new RuntimeException("Bad result in " + name + " for m = " + m + " expected " + expected + " got " + res); |
| } |
| } |
| |
| static void helper2(String name, Function<int[], Boolean> test, int[] m_values, boolean[] expected) { |
| for (int j = 0; j < m_values.length; j++) { |
| int m = m_values[j]; |
| int[] array = new int[m]; |
| boolean res = test.apply(array); |
| check_result(name, m, expected[j], res); |
| } |
| } |
| |
| // ((x & m) u<= m) is always true |
| static boolean test1(int x, int[] array) { |
| int m = array.length; |
| if ((x & m) < 0 || (x & m) > m) { |
| return false; |
| } |
| return true; |
| } |
| |
| // ((x & (m - 1)) u< m) iff (m > 0) |
| static boolean test2(int x, int[] array) { |
| int m = array.length; |
| if ((x & (m-1)) < 0 || (x & (m-1)) >= m) { |
| return false; |
| } |
| return true; |
| } |
| |
| static boolean test3(int x, int[] array) { |
| try { |
| int v = array[x & (array.length-1)]; |
| } catch(ArrayIndexOutOfBoundsException aioobe) { |
| return false; |
| } |
| return true; |
| } |
| |
| // arraylength <= 0 to arraylength u<= 0 |
| static boolean test4(int[] array) { |
| if (array.length <= 0) { |
| return false; |
| } |
| return true; |
| } |
| |
| // arraylength == 0 to arraylength u<= 0 |
| static boolean test5(int[] array) { |
| if (array.length == 0) { |
| return false; |
| } |
| return true; |
| } |
| |
| // arraylength != 0 to arraylength u> 0 |
| static boolean test6(int[] array) { |
| if (array.length != 0) { |
| return false; |
| } |
| return true; |
| } |
| |
| static public void main(String[] args) { |
| int[] x_values = {-10, -5, 0, 5, 8, 16, 100}; |
| int[] m_values = { 16, 10, 0 }; |
| |
| boolean[][] test1_expected = new boolean[x_values.length][m_values.length]; |
| for (int i = 0; i < x_values.length; i++) { |
| for (int j = 0; j < m_values.length; j++) { |
| test1_expected[i][j] = true; |
| } |
| } |
| |
| boolean[][] test2_expected = new boolean[x_values.length][m_values.length]; |
| for (int i = 0; i < x_values.length; i++) { |
| for (int j = 0; j < m_values.length; j++) { |
| test2_expected[i][j] = (m_values[j] > 0); |
| } |
| } |
| |
| boolean[] test4_expected = new boolean[m_values.length]; |
| for (int i = 0; i < m_values.length; i++) { |
| test4_expected[i] = (m_values[i] > 0); |
| } |
| boolean[] test5_expected = new boolean[m_values.length]; |
| for (int i = 0; i < m_values.length; i++) { |
| test5_expected[i] = (m_values[i] != 0); |
| } |
| boolean[] test6_expected = new boolean[m_values.length]; |
| for (int i = 0; i < m_values.length; i++) { |
| test6_expected[i] = (m_values[i] == 0); |
| } |
| |
| for (int i = 0; i < 20000; i++) { |
| helper("test1", PowerOf2SizedArraysChecks::test1, x_values, m_values, test1_expected); |
| helper("test2", PowerOf2SizedArraysChecks::test2, x_values, m_values, test2_expected); |
| helper("test3", PowerOf2SizedArraysChecks::test3, x_values, m_values, test2_expected); |
| helper2("test4", PowerOf2SizedArraysChecks::test4, m_values, test4_expected); |
| helper2("test5", PowerOf2SizedArraysChecks::test5, m_values, test5_expected); |
| helper2("test6", PowerOf2SizedArraysChecks::test6, m_values, test6_expected); |
| } |
| } |
| } |