hotspot/test/compiler/loopopts/TestPredicateLostDependency.java
author bharadwaj
Tue, 05 Apr 2016 20:32:54 +0000
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parent 30300 4b12a5b40064
child 40059 c2304140ed64
permissions -rw-r--r--
Merge
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/*
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 * Copyright (c) 2015, 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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/**
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 * @test
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 * @bug 8069191
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 * @summary predicate moved out of loops and CastPP removal causes dependency to be lost
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 * @run main/othervm -Xcomp -XX:CompileOnly=TestPredicateLostDependency.m1 -XX:+IgnoreUnrecognizedVMOptions -XX:+StressGCM TestPredicateLostDependency
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 *
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 */
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public class TestPredicateLostDependency {
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    static class A {
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        int i;
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    }
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    static class B extends A {
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    }
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    static boolean crash = false;
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    static boolean m2() {
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        return crash;
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    }
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    static int m3(float[] arr) {
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        return 0;
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    }
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    static float m1(A aa) {
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        float res = 0;
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        float[] arr = new float[10];
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        for (int i = 0; i < 10; i++) {
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            if (m2()) {
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                arr = null;
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            }
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            m3(arr);
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            int j = arr.length;
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            int k = 0;
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            for (k = 9; k < j; k++) {
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            }
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            if (k == 10) {
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                if (aa instanceof B) {
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                }
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            }
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            res += arr[0];
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            res += arr[1];
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        }
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        return res;
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    }
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    static public void main(String args[]) {
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        A a = new A();
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        B b = new B();
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        for (int i = 0; i < 20000; i++) {
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            m1(a);
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        }
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        crash = true;
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        try {
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            m1(a);
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        } catch (NullPointerException npe) {}
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    }
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}