74 lines
2.3 KiB
Java
74 lines
2.3 KiB
Java
/*
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* Copyright (c) 2021, 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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package compiler.uncommontrap;
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/**
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* @test
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* @bug 8261730 8265132
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* @summary Test that no anti-dependence violation is reported between a store
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* used as an implicit null check and a load placed in the null block.
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* @run main/othervm -XX:-BackgroundCompilation
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* compiler.uncommontrap.TestNullCheckAntiDependence
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*/
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public class TestNullCheckAntiDependence {
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private static class MyInteger {
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int val;
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}
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private static MyInteger foo = new MyInteger();
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private static MyInteger bar = new MyInteger();
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private static MyInteger[] global = {new MyInteger()};
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static void test1() {
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for (int i = 0; i < 1; i++) {
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// This load is placed in the null block.
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foo.val = -bar.val;
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for (int k = 0; k < 10; k++) {
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// This store is hoisted and used as an implicit null check.
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foo.val = 0;
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}
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}
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}
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static void test2(MyInteger a, MyInteger b) {
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global[0].val = a.val + b.val * 31;
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global[0].val = 0;
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return;
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}
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public static void main(String[] args) {
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for (int i = 0; i < 10_000; i++) {
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test1();
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}
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for (int i = 0; i < 10_000; i++) {
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test2(new MyInteger(), new MyInteger());
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}
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}
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}
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