/* * 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 8359602 * @summary The control input of a ModI node should be discarded if it is * possible to prove that the divisor can never be 0. * VerifyIterativeGVN checks that this optimization was applied * @run main/othervm -XX:CompileCommand=quiet -XX:-TieredCompilation * -XX:+UnlockDiagnosticVMOptions -Xcomp -XX:+IgnoreUnrecognizedVMOptions * -XX:CompileCommand=compileonly,compiler.c2.TestModControlFoldedAfterCCP::test * -XX:VerifyIterativeGVN=1110 compiler.c2.TestModControlFoldedAfterCCP * @run main compiler.c2.TestModControlFoldedAfterCCP * */ package compiler.c2; public class TestModControlFoldedAfterCCP { static void test() { int i22, i24 = -1191, i28; int iArr1[] = new int[1]; for (int i = 1;i < 100; i++) { for (int j = 4; j > i; j--) { i22 = i24; // divisor is either -1191 or -13957 iArr1[0] = 5 % i22; } for (i28 = i; i28 < 2; ++i28) { i24 = -13957; } } } public static void main(String[] args) { test(); } }