d244b3ccd1
Prevent merging of back to back ifs if one is a counted loop end. Reviewed-by: kvn, thartmann
54 lines
1.7 KiB
Java
54 lines
1.7 KiB
Java
/*
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* Copyright (c) 2018, 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 8196296
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* @summary Bad graph when unrolled loop bounds conflicts with range checks
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*
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* @run main/othervm -XX:-BackgroundCompilation -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=0 TestStripMinedBackToBackIfs
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*
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*/
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public class TestStripMinedBackToBackIfs {
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public static void main(String[] args) {
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for (int i = 0; i < 20_000; i++) {
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test(100);
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}
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}
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private static double test(int limit) {
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double v = 1;
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for (int i = 0; i < limit; i++) {
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v = v * 4;
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// We don't want this test to be merged with identical
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// loop end test
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if (i+1 < limit) {
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v = v * 2;
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}
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}
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return v;
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}
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}
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