hotspot/test/compiler/loopopts/TestSplitIfUnswitchedLoopsEliminated.java
author chegar
Tue, 22 Mar 2016 15:26:07 +0000
changeset 36694 182a5e7a519e
parent 30309 da3efc8ed2cb
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 8078426
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 * @summary split if finds predicates on several incoming paths when unswitched's loops are optimized out
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 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-UseCompressedOops TestSplitIfUnswitchedLoopsEliminated
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 *
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 */
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public class TestSplitIfUnswitchedLoopsEliminated {
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    static class A {
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        int f;
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    }
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    static A aa = new A();
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    static A aaa = new A();
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    static int test_helper(int stop, boolean unswitch) {
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        A a = null;
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        for (int i = 3; i < 10; i++) {
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            if (unswitch) {
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                a = null;
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            } else {
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                a = aa;
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                int v = a.f;
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            }
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        }
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        if (stop != 4) {
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            a = aaa;
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        }
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        if (a != null) {
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            return a.f;
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        }
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        return 0;
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    }
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    static int test(boolean unswitch) {
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        int stop = 1;
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        for (; stop < 3; stop *= 4) {
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        }
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        return test_helper(stop, unswitch);
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    }
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    public static void main(String[] args) {
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        for (int i = 0; i < 20000; i++) {
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            test_helper(10, i%2 == 0);
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            test(i%2 == 0);
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        }
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    }
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}