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annotate test/compiler/loopopts/TestDeadBackbranchArrayAccess.java @ 21188:2acf1d23d3af

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Move PhiResolver from c.o.g.compiler.gen to c.o.g.lir.gen.
author Josef Eisl <josef.eisl@jku.at>
date Mon, 20 Apr 2015 14:24:55 +0200
parents 5b8e0f84f00f
children
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 /**
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26 * @test
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27 * @bug 8054478
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28 * @summary dead backbranch in main loop results in erroneous array access
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29 * @run main/othervm -XX:CompileOnly=TestDeadBackbranchArrayAccess -Xcomp TestDeadBackbranchArrayAccess
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30 *
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31 */
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32
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33 public class TestDeadBackbranchArrayAccess {
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34 static char[] pattern0 = {0};
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35 static char[] pattern1 = {1};
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36
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37 static void test(char[] array) {
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38 if (pattern1 == null) return;
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39
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40 int i = 0;
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41 int pos = 0;
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42 char c = array[pos];
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43
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44 while (i >= 0 && (c == pattern0[i] || c == pattern1[i])) {
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45 i--;
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46 pos--;
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47 if (pos != -1) {
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48 c = array[pos];
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49 }
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50 }
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51 }
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52
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53 public static void main(String[] args) {
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54 for (int i = 0; i < 1000000; i++) {
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55 test(new char[1]);
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56 }
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57 }
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58 }