58 lines
2.3 KiB
Java
58 lines
2.3 KiB
Java
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/*
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* Copyright (c) 2016, 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 8159016
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* @requires vm.gc == "Parallel" | vm.gc == "null"
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* @summary Tests correct dominator information after over-unrolling a loop.
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* @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -Xcomp -XX:-TieredCompilation
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* -XX:-UseG1GC -XX:+UseParallelGC TestOverunrolling
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*/
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public class TestOverunrolling {
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public static Object test(int arg) {
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Object arr[] = new Object[3];
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int lim = (arg & 3);
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// The pre loop is executed for one iteration, initializing p[0].
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// The main loop is unrolled twice, initializing p[1], p[2], p[3] and p[4].
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// The p[3] and p[4] stores are always out of bounds and removed. However,
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// C2 is unable to remove the "over-unrolled", dead main loop. As a result,
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// there is a control path from the main loop to the post loop without a
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// memory path (because the last store was replaced by TOP). We crash
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// because we use a memory edge from a non-dominating region.
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for (int i = 0; i < lim; ++i) {
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arr[i] = new Object();
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}
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// Avoid EA
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return arr;
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}
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public static void main(String args[]) {
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for (int i = 0; i < 42; ++i) {
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test(i);
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}
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}
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}
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