Mercurial > hg > truffle
annotate test/compiler/rangechecks/TestRangeCheckSmearingLoopOpts.java @ 20860:dc795777f789
converted @MethodSubstitutions for java.lang.Object to MethodSubstitutionPlugins
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 09 Apr 2015 08:54:09 +0200 |
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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 } |