Mercurial > hg > truffle
annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/profiles/LoopConditionProfile.java @ 22501:a63bda98cfdb
Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
| author | Christian Humer <christian.humer@oracle.com> |
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| date | Wed, 16 Dec 2015 16:38:13 +0100 |
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22501
a63bda98cfdb
Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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1 /* |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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4 * |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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5 * This code is free software; you can redistribute it and/or modify it |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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6 * under the terms of the GNU General Public License version 2 only, as |
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a63bda98cfdb
Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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7 * published by the Free Software Foundation. Oracle designates this |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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8 * particular file as subject to the "Classpath" exception as provided |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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9 * by Oracle in the LICENSE file that accompanied this code. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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10 * |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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a63bda98cfdb
Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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15 * accompanied this code). |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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16 * |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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17 * You should have received a copy of the GNU General Public License version |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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a63bda98cfdb
Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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20 * |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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22 * or visit www.oracle.com if you need additional information or have any |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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23 * questions. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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24 */ |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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25 package com.oracle.truffle.api.profiles; |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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26 |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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27 import com.oracle.truffle.api.CompilerDirectives; |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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28 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal; |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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29 import com.oracle.truffle.api.Truffle; |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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30 |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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31 /** |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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32 * <p> |
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33 * LoopConditionProfiles are designed to profile the outcome of loop conditions. Loop profiles can |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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34 * be used to profile unpredictable loops as well as predictable loops. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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35 * </p> |
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36 * |
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37 * <p> |
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38 * <b> Arbitrary loop usage example: </b> |
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39 * |
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40 * <pre> |
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41 * class LoopNode extends Node { |
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42 * |
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43 * final LoopConditionProfile loopProfile = LoopConditionProfile.createCountingProfile(); |
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44 * |
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45 * void execute() { |
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46 * // loop count cannot be predicted |
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47 * while (loopProfile.profile(Math.random() >= 0.9)) { |
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48 * // work |
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49 * } |
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50 * } |
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51 * } |
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52 * </pre> |
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53 * |
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54 * </p> |
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55 * |
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56 * <p> |
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57 * <b> Counted loop usage example: </b> |
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58 * |
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59 * <pre> |
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60 * class CountedLoopNode extends Node { |
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61 * |
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62 * final LoopConditionProfile loopProfile = LoopConditionProfile.createCountingProfile(); |
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63 * |
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64 * void execute(int length) { |
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65 * // loop count can be predicted |
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66 * loopProfile.profileCounted(length); |
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67 * for (int i = 0; loopProfile.inject(i < length); i++) { |
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68 * // work |
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69 * } |
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70 * } |
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71 * } |
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72 * </pre> |
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73 * |
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74 * </p> |
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75 * <p> |
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76 * The advantage of using {@link #profileCounted(long)} to using {@link #profile(boolean)} is that |
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77 * it incurs less overhead in the interpreter. Using {@link LoopConditionProfile#inject(boolean)} is |
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78 * a no-op in the interpreter while {@link #profile(boolean)} needs to use a counter for each |
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79 * iteration. |
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80 * </p> |
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81 * |
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82 * |
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83 * {@inheritDoc} |
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84 * |
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85 * @see #createBinaryProfile() |
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86 * @see #createCountingProfile() |
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87 * @see LoopConditionProfile |
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88 */ |
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89 public abstract class LoopConditionProfile extends ConditionProfile { |
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90 |
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91 LoopConditionProfile() { |
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92 } |
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93 |
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94 @Override |
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95 public abstract boolean profile(boolean value); |
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96 |
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97 /** |
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98 * Provides an alternative way to profile counted loops with less interpreter footprint. Please |
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99 * see {@link LoopConditionProfile} for an usage example. |
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100 * |
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101 * @see #inject(boolean) |
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102 */ |
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103 public abstract void profileCounted(long length); |
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104 |
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105 /** |
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106 * Provides an alternative way to profile counted loops with less interpreter footprint. Please |
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107 * see {@link LoopConditionProfile} for an usage example. |
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108 * |
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109 * @see #inject(boolean) |
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110 */ |
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111 public abstract boolean inject(boolean condition); |
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112 |
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113 /** |
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114 * Returns a {@link LoopConditionProfile} that speculates on loop conditions to be never |
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115 * <code>true</code>. It also captures loop probabilities for the compiler. Loop condition |
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116 * profiles are intended to be used for loop conditions. |
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117 * |
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118 * @see LoopConditionProfile |
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119 */ |
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120 public static LoopConditionProfile createCountingProfile() { |
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121 if (Truffle.getRuntime().isProfilingEnabled()) { |
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122 return Enabled.create(); |
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123 } else { |
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124 return Disabled.INSTANCE; |
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125 } |
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126 } |
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127 |
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128 static final class Enabled extends LoopConditionProfile { |
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129 |
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130 @CompilationFinal private long trueCount; // long for long running loops. |
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131 @CompilationFinal private int falseCount; |
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132 |
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133 @Override |
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134 public boolean profile(boolean condition) { |
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135 if (CompilerDirectives.inInterpreter()) { |
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136 if (condition) { |
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137 // local required to guarantee no overflow in multi-threaded environments |
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138 long localTrueCount = trueCount; |
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139 if (localTrueCount < Long.MAX_VALUE) { |
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140 trueCount = localTrueCount + 1; |
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141 } |
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142 } else { |
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143 // local required to guarantee no overflow in multi-threaded environments |
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144 int localFalseCount = falseCount; |
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145 if (localFalseCount < Integer.MAX_VALUE) { |
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146 falseCount = localFalseCount + 1; |
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147 } |
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148 } |
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149 // no branch probability calculation in the interpreter |
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150 return condition; |
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151 } else { |
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152 long trueCountLocal = trueCount; |
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153 int falseCountLocal = falseCount; |
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154 if (trueCountLocal == 0) { |
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155 /* Deopt for never entering the loop. */ |
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156 if (condition) { |
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157 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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158 trueCount = trueCountLocal = 1; |
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159 } |
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160 } |
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161 /* No deopt for not entering the loop. */ |
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162 return CompilerDirectives.injectBranchProbability(calculateProbability(trueCountLocal, falseCountLocal), condition); |
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163 } |
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164 } |
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165 |
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166 @Override |
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167 public void profileCounted(long length) { |
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168 if (CompilerDirectives.inInterpreter()) { |
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169 long trueCountLocal = trueCount + length; |
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170 if (trueCountLocal >= 0) { // don't write overflow values |
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171 trueCount = trueCountLocal; |
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172 int falseCountLocal = falseCount; |
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173 if (falseCountLocal < Integer.MAX_VALUE) { |
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174 falseCount = falseCountLocal + 1; |
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175 } |
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176 } |
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177 } |
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178 } |
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179 |
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180 @Override |
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181 public boolean inject(boolean condition) { |
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182 if (CompilerDirectives.inCompiledCode()) { |
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183 return CompilerDirectives.injectBranchProbability(calculateProbability(trueCount, falseCount), condition); |
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184 } else { |
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185 return condition; |
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186 } |
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187 } |
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188 |
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189 private static double calculateProbability(long trueCountLocal, int falseCountLocal) { |
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190 if (falseCountLocal == 0 && trueCountLocal == 0) { |
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191 /* Avoid division by zero if profile was never used. */ |
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192 return 0.0; |
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193 } else { |
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194 return (double) trueCountLocal / (double) (trueCountLocal + falseCountLocal); |
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195 } |
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196 } |
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197 |
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198 /* for testing */ |
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199 long getTrueCount() { |
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200 return trueCount; |
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201 } |
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202 |
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203 /* for testing */ |
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204 int getFalseCount() { |
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205 return falseCount; |
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206 } |
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207 |
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208 @Override |
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209 public String toString() { |
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210 return toString(LoopConditionProfile.class, falseCount == 0, false, // |
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211 String.format("trueProbability=%s (trueCount=%s, falseCount=%s)", calculateProbability(trueCount, falseCount), falseCount, trueCount)); |
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212 } |
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213 |
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214 /* Needed for lazy class loading. */ |
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215 static LoopConditionProfile create() { |
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216 return new Enabled(); |
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217 } |
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218 |
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219 } |
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220 |
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221 static final class Disabled extends LoopConditionProfile { |
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222 |
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223 static final LoopConditionProfile INSTANCE = new Disabled(); |
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224 |
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225 @Override |
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226 protected Object clone() { |
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227 return INSTANCE; |
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228 } |
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229 |
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230 @Override |
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231 public boolean profile(boolean condition) { |
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232 return condition; |
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233 } |
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234 |
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235 @Override |
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236 public void profileCounted(long length) { |
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237 } |
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238 |
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239 @Override |
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240 public boolean inject(boolean condition) { |
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241 return condition; |
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242 } |
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243 |
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244 @Override |
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245 public String toString() { |
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246 return toStringDisabled(LoopConditionProfile.class); |
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247 } |
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248 |
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249 } |
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250 |
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251 } |