86 lines
2.7 KiB
Java
86 lines
2.7 KiB
Java
/*
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* Copyright (c) 2019, Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2022, 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 8231988 8293996
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* @summary Unexpected test result caused by C2 IdealLoopTree::do_remove_empty_loop
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*
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* @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation
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* -XX:+IgnoreUnrecognizedVMOptions -XX:StressLongCountedLoop=0
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* compiler.loopopts.TestRemoveEmptyLoop
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*/
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package compiler.loopopts;
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public class TestRemoveEmptyLoop {
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public void test_cmp_helper() {
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int i = 34;
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// The empty loop that collapses
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for (; i > 0; i -= 11);
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// If uses same Cmp node as the loop condition
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if (i < 0) {
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// do nothing
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} else {
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throw new RuntimeException("Test failed.");
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}
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}
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public void test_cmp() {
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// Loop is OSR compiled, and test_cmp_helper inlined
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for (int i = 0; i < 50000; i++) {
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test_cmp_helper();
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}
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}
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void test_collapse_helper() {
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int o = 11;
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int e = 43542;
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for (int i = 524; i < 19325; i += 1) {
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// The empty loop that is supposed to collapse
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for (int j = 0; j < 32767; j++) {
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o++;
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}
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for (int k = 0; k < o; k++) {
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e++;
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}
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}
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}
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public void test_collapse() {
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// Loop is OSR compiled, and test_collapse_helper inlined
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for (int i = 0; i < 50000; i++) {
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test_collapse_helper();
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}
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}
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public static void main(String[] args) {
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TestRemoveEmptyLoop _instance = new TestRemoveEmptyLoop();
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_instance.test_cmp();
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_instance.test_collapse();
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System.out.println("Test passed.");
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}
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}
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