72 lines
2.4 KiB
Java
72 lines
2.4 KiB
Java
/*
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* Copyright (c) 2023, Red Hat, Inc. 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 8314024
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* @requires vm.compiler2.enabled
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* @summary Node used in check in main loop sunk from pre loop before RC elimination
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* @run main/othervm -XX:-BackgroundCompilation -XX:-UseLoopPredicate TestNodeSunkFromPreLoop
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*
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*/
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public class TestNodeSunkFromPreLoop {
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private static int unusedField;
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public static void main(String[] args) {
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A object = new A();
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for (int i = 0; i < 20_000; i++) {
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test(object, 1000, 0);
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}
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}
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private static int test(A object, int stop, int inv) {
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int res = 0;
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// pre/main/post loops created for this loop
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for (int i = 0; i < stop; i++) {
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// Optimized out. Delay transformation of loop above.
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for (int j = 0; j < 10; j++) {
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for (int k = 0; k < 10; k++) {
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}
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}
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// null check in pre loop so field load also in pre loop
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int v = object.field;
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int v2 = (v + inv);
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if (i > 1000) {
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// never taken. v + inv has a use out of loop at an unc.
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unusedField = v2;
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}
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// transformed in the main loop to i + (v + inv)
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int v3 = (v + (i + inv));
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if (v3 > 1000) {
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break;
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}
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}
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return res;
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}
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private static class A {
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public int field;
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}
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}
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