65 lines
2.2 KiB
Java
65 lines
2.2 KiB
Java
/*
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* Copyright (c) 2022, 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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package compiler.c2.irTests;
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import compiler.lib.ir_framework.*;
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/*
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* @test
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* @bug 8279888
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* @summary Local variable independently used by multiple loops can interfere with loop optimizations
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* @library /test/lib /
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* @requires vm.compiler2.enabled
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* @run driver compiler.c2.irTests.TestDuplicateBackedge
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*/
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public class TestDuplicateBackedge {
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public static void main(String[] args) {
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TestFramework.runWithFlags("-XX:LoopMaxUnroll=1");
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TestFramework.runWithFlags("-XX:LoopMaxUnroll=1", "-XX:-DuplicateBackedge");
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}
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@Test
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@IR(applyIf = { "DuplicateBackedge", "true" }, counts = {IRNode.LOOP, "1", IRNode.COUNTED_LOOP, "1" })
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@IR(applyIf = { "DuplicateBackedge", "false" }, counts = { IRNode.LOOP, "1" })
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@IR(applyIf = { "DuplicateBackedge", "false" }, failOn = { IRNode.COUNTED_LOOP})
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public static float test() {
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float res = 1;
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for (int i = 1;;) {
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if (i % 10 == 0) {
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i = (i * 2) + 1;
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res /= 42;
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} else {
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i++;
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res *= 42;
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}
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if (i >= 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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}
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