Mercurial > hg > truffle

annotate test/compiler/rangechecks/TestRangeCheckSmearingLoopOpts.java @ 21097:391f94d4d23f

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Move MatchProcessor and HotSpotVMConfigPorcessor to their own projects
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Thu, 23 Apr 2015 14:48:52 +0200
parents b6585ac86988
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 * @test
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26 * @bug 8048170
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27 * @summary Following range check smearing, range check cannot be replaced by dominating identical test.
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28 * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestRangeCheckSmearingLoopOpts
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29 *
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30 */
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31 public class TestRangeCheckSmearingLoopOpts {
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32
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33 static int dummy;
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34
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35 static int m1(int[] array, int i) {
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36 for (;;) {
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37 for (;;) {
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38 if (array[i] < 0) { // range check (i+0) dominates equivalent check below
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39 break;
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40 }
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41 i++;
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42 }
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43
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44 // A control flow that stops IfNode::up_one_dom()
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45 if ((i % 2)== 0) {
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46 if ((array[i] % 2) == 0) {
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47 dummy = i;
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48 }
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49 }
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50
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51 // IfNode::Ideal will rewrite some range checks if Compile::allow_range_check_smearing
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52 if (array[i-1] == 9) { // range check (i-1) unchanged
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53 int res = array[i-3]; // range check (i-3) unchanged
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54 res += array[i]; // range check (i+0) unchanged
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55 res += array[i-2]; // removed redundant range check
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56 // the previous access might be hoisted by
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57 // PhaseIdealLoop::split_if_with_blocks_post because
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58 // it appears to have the same guard, but it also
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59 // depends on the previous guards
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60 return res;
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61 }
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62 i++;
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63 }
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64 }
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65
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66 static public void main(String[] args) {
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67 int[] array = { 0, 1, 2, -3, 4, 5, -2, 7, 8, 9, -1 };
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68 for (int i = 0; i < 20000; i++) {
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69 m1(array, 0);
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70 }
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71 array[0] = -1;
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72 try {
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73 m1(array, 0);
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74 } catch(ArrayIndexOutOfBoundsException aioobe) {}
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75 }
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76 }