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annotate test/compiler/loopopts/TestLoopPeeling.java @ 24225:a2dbb6fcc923

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Added tag jvmci-0.33 for changeset 3aed4cb813f4
author Doug Simon <doug.simon@oracle.com>
date Fri, 18 Aug 2017 22:47:33 +0200
parents 535618ab1c04
children
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1 /*
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2 * Copyright (c) 2016, 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 8078262
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27 * @summary Tests correct dominator information after loop peeling.
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28 * @run main/othervm -Xcomp -XX:CompileCommand=compileonly,TestLoopPeeling::test* TestLoopPeeling
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29 */
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30 public class TestLoopPeeling {
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31
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32 public int[] array = new int[100];
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33
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34 public static void main(String args[]) {
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35 TestLoopPeeling test = new TestLoopPeeling();
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36 try {
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37 test.testArrayAccess(0, 1);
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38 test.testArrayAllocation(0, 1);
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39 } catch (Exception e) {
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40 // Ignore exceptions
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41 }
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42 }
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43
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44 public void testArrayAccess(int index, int inc) {
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45 int storeIndex = -1;
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46
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47 for (; index < 10; index += inc) {
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48 // This loop invariant check triggers loop peeling because it can
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49 // be moved out of the loop (see 'IdealLoopTree::policy_peeling').
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50 if (inc == 42) return;
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51
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52 // This loop variant usage of LShiftL( ConvI2L( Phi(storeIndex) ) )
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53 // prevents the split if optimization that would otherwise clone the
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54 // LShiftL and ConvI2L nodes and assign them to their corresponding array
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55 // address computation (see 'PhaseIdealLoop::split_if_with_blocks_post').
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56 if (storeIndex > 0 && array[storeIndex] == 42) return;
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57
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58 if (index == 42) {
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59 // This store and the corresponding range check are moved out of the
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60 // loop and both used after old loop and the peeled iteration exit.
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61 // For the peeled iteration, storeIndex is always -1 and the ConvI2L
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62 // is replaced by TOP. However, the range check is not folded because
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63 // we don't do the split if optimization in PhaseIdealLoop2.
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64 // As a result, we have a (dead) control path from the peeled iteration
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65 // to the StoreI but the data path is removed.
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66 array[storeIndex] = 1;
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67 return;
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68 }
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69
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70 storeIndex++;
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71 }
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72 }
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73
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74 public byte[] testArrayAllocation(int index, int inc) {
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75 int allocationCount = -1;
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76 byte[] result;
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77
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78 for (; index < 10; index += inc) {
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79 // This loop invariant check triggers loop peeling because it can
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80 // be moved out of the loop (see 'IdealLoopTree::policy_peeling').
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81 if (inc == 42) return null;
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82
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83 if (index == 42) {
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84 // This allocation and the corresponding size check are moved out of the
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85 // loop and both used after old loop and the peeled iteration exit.
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86 // For the peeled iteration, allocationCount is always -1 and the ConvI2L
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87 // is replaced by TOP. However, the size check is not folded because
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88 // we don't do the split if optimization in PhaseIdealLoop2.
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89 // As a result, we have a (dead) control path from the peeled iteration
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90 // to the allocation but the data path is removed.
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91 result = new byte[allocationCount];
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92 return result;
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93 }
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94
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95 allocationCount++;
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96 }
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97 return null;
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98 }
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99 }
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100