/* * Copyright (c) 2025, 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 8367967 * @summary Ensure ModI/LNode::Value is monotonic with potential division by 0 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:CompileOnly=compiler.ccp.TestModValueMonotonic::test* * -XX:+StressCCP -XX:RepeatCompilation=100 -Xcomp compiler.ccp.TestModValueMonotonic * @run main compiler.ccp.TestModValueMonotonic */ package compiler.ccp; public class TestModValueMonotonic { static int iFld; static long lFld; static int limit = 1000; static boolean flag; public static void main(String[] args) { testInt(); testLong(); } static void testInt() { int zero = 0; // Make sure loop is not counted such that it is not removed. Created a more complex graph for CCP. for (int i = 1; i < limit; i*=4) { zero = 34; } int three = flag ? 0 : 3; iFld = three % zero; // phi[0..3] % phi[0..34] } static void testLong() { long zero = 0; // Make sure loop is not counted such that it is not removed. Created a more complex graph for CCP. for (int i = 1; i < limit; i*=4) { zero = 34; } long three = flag ? 0 : 3; lFld = three % zero; // phi[0..3] % phi[0..34] } }