CoCalc -- TestAntiDependentMembar.java

GitHub Repository: PojavLauncherTeam/mobile
Path: blob/master/test/hotspot/jtreg/compiler/controldependency/TestAntiDependentMembar.java
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/*
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 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/**
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 * @test
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 * @bug 8228772
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 * @summary Test correct insertion of anti-dependencies if load is already control dependent on membar.
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 * @run main/othervm -Xbatch -XX:-TieredCompilation
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 *                   -XX:CompileCommand=inline,compiler.controldependency.TestAntiDependentMembar::hitSearchLimit
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 *                   compiler.controldependency.TestAntiDependentMembar
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 * @run main/othervm -Xbatch -XX:-TieredCompilation
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 *                   -XX:CompileCommand=inline,compiler.controldependency.TestAntiDependentMembar::hitSearchLimit
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 *                   -XX:+UnlockDiagnosticVMOptions -XX:+IgnoreUnrecognizedVMOptions -XX:DominatorSearchLimit=0
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 *                   compiler.controldependency.TestAntiDependentMembar
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 */
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package compiler.controldependency;
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public class TestAntiDependentMembar {
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    static volatile int step1 = 0;
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    static volatile int step2 = 0;
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    public static int test1(int count, int b1, int b2) {
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        int[] result = {0};
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        // Complex control flow to generate Region with 4 paths and therefore bail out of Node::dominates
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        if (b1 == 0) {
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            count += 1;
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        } else if (b1 == 1) {
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            if (b2 == 1) {
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                count += 2;
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            }
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        }
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        for (int i = 0; i < count; ++i) {
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            // Volatile field write adds a membar
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            step1 = i;
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            // Load that is dependent on the membar
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            result[0] += count;
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        }
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        return result[0];
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    }
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    // Same as test1 but bailing out of Node::dominates due to hitting DominatorSearchLimit
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    public static int test2(int count) {
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        int[] result = {0};
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        // Large method with regions to hit the DominatorSearchLimit
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        hitSearchLimit();
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        for (int i = 0; i < count; ++i) {
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            step1 = i;
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            result[0] += count;
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        }
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        return result[0];
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    }
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    // Same as test2 but with multiple membars before the load
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    public static int test3(int count) {
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        int[] result = {0};
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        hitSearchLimit();
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        for (int i = 0; i < count; ++i) {
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            step1 = i;
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            step2 = i;
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            step1 = i;
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            step2 = i;
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            result[0] += count;
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        }
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        return result[0];
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    }
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    public static void main(String[] args) {
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        for (int i = 0; i < 50_000; ++i) {
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          test1(10, 0, 0);
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          test1(10, 1, 1);
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          test1(10, 1, 0);
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          test1(10, 0, 1);
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          test2(10);
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          test3(10);
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        }
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    }
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    public static void hitSearchLimit() {
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}
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