77 lines
2.6 KiB
Java
77 lines
2.6 KiB
Java
/*
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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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* @test
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* @bug 8086046
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* @summary load bypasses arraycopy that sets the value after the ArrayCopyNode is expanded
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*
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* @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement
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* -XX:CompileCommand=dontinline,compiler.arraycopy.TestLoadBypassArrayCopy::test_helper
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* -XX:-TieredCompilation
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* compiler.arraycopy.TestLoadBypassArrayCopy
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*/
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package compiler.arraycopy;
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public class TestLoadBypassArrayCopy {
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static long i;
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static boolean test_helper() {
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i++;
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if ((i%10) == 0) {
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return false;
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}
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return true;
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}
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static int test(int[] src, int len, boolean flag) {
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int[] dest = new int[10];
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int res = 0;
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while (test_helper()) {
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System.arraycopy(src, 0, dest, 0, len);
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// predicate moved out of loop so control of following
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// load is not the ArrayCopyNode. Otherwise, if the memory
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// of the load is changed and the control is set to the
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// ArrayCopyNode the graph is unschedulable and the test
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// doesn't fail.
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if (flag) {
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}
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// The memory of this load shouldn't bypass the arraycopy
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res = dest[0];
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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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int[] src = new int[10];
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src[0] = 0x42;
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for (int i = 0; i < 20000; i++) {
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int res = test(src, 10, false);
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if (res != src[0]) {
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throw new RuntimeException("test failed");
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}
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}
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}
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}
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