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annotate lib/Support/DAGDeltaAlgorithm.cpp @ 97:b0dd3743370f

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Wed, 14 Oct 2015 19:39:58 +0900
parents afa8332a0e37
children
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1 //===--- DAGDeltaAlgorithm.cpp - A DAG Minimization Algorithm --*- C++ -*--===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // The algorithm we use attempts to exploit the dependency information by
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10 // minimizing top-down. We start by constructing an initial root set R, and
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11 // then iteratively:
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12 //
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13 // 1. Minimize the set R using the test predicate:
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14 // P'(S) = P(S union pred*(S))
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15 //
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16 // 2. Extend R to R' = R union pred(R).
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17 //
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18 // until a fixed point is reached.
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19 //
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20 // The idea is that we want to quickly prune entire portions of the graph, so we
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21 // try to find high-level nodes that can be eliminated with all of their
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22 // dependents.
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23 //
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24 // FIXME: The current algorithm doesn't actually provide a strong guarantee
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25 // about the minimality of the result. The problem is that after adding nodes to
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26 // the required set, we no longer consider them for elimination. For strictly
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27 // well formed predicates, this doesn't happen, but it commonly occurs in
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28 // practice when there are unmodelled dependencies. I believe we can resolve
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29 // this by allowing the required set to be minimized as well, but need more test
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30 // cases first.
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31 //
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32 //===----------------------------------------------------------------------===//
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33
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34 #include "llvm/ADT/DAGDeltaAlgorithm.h"
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35 #include "llvm/ADT/DeltaAlgorithm.h"
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36 #include "llvm/Support/Debug.h"
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37 #include "llvm/Support/Format.h"
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38 #include "llvm/Support/raw_ostream.h"
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39 #include <algorithm>
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40 #include <cassert>
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41 #include <iterator>
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42 #include <map>
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43 using namespace llvm;
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44
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45 #define DEBUG_TYPE "dag-delta"
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46
0
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47 namespace {
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48
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49 class DAGDeltaAlgorithmImpl {
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50 friend class DeltaActiveSetHelper;
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51
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52 public:
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53 typedef DAGDeltaAlgorithm::change_ty change_ty;
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54 typedef DAGDeltaAlgorithm::changeset_ty changeset_ty;
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55 typedef DAGDeltaAlgorithm::changesetlist_ty changesetlist_ty;
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56 typedef DAGDeltaAlgorithm::edge_ty edge_ty;
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57
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58 private:
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59 typedef std::vector<change_ty>::iterator pred_iterator_ty;
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60 typedef std::vector<change_ty>::iterator succ_iterator_ty;
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61 typedef std::set<change_ty>::iterator pred_closure_iterator_ty;
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62 typedef std::set<change_ty>::iterator succ_closure_iterator_ty;
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63
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64 DAGDeltaAlgorithm &DDA;
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65
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66 std::vector<change_ty> Roots;
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67
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68 /// Cache of failed test results. Successful test results are never cached
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69 /// since we always reduce following a success. We maintain an independent
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70 /// cache from that used by the individual delta passes because we may get
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71 /// hits across multiple individual delta invocations.
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72 mutable std::set<changeset_ty> FailedTestsCache;
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73
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74 // FIXME: Gross.
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75 std::map<change_ty, std::vector<change_ty> > Predecessors;
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76 std::map<change_ty, std::vector<change_ty> > Successors;
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77
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78 std::map<change_ty, std::set<change_ty> > PredClosure;
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79 std::map<change_ty, std::set<change_ty> > SuccClosure;
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80
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81 private:
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82 pred_iterator_ty pred_begin(change_ty Node) {
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83 assert(Predecessors.count(Node) && "Invalid node!");
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84 return Predecessors[Node].begin();
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85 }
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86 pred_iterator_ty pred_end(change_ty Node) {
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87 assert(Predecessors.count(Node) && "Invalid node!");
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88 return Predecessors[Node].end();
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89 }
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90
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91 pred_closure_iterator_ty pred_closure_begin(change_ty Node) {
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92 assert(PredClosure.count(Node) && "Invalid node!");
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93 return PredClosure[Node].begin();
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94 }
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95 pred_closure_iterator_ty pred_closure_end(change_ty Node) {
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96 assert(PredClosure.count(Node) && "Invalid node!");
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97 return PredClosure[Node].end();
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98 }
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99
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100 succ_iterator_ty succ_begin(change_ty Node) {
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101 assert(Successors.count(Node) && "Invalid node!");
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102 return Successors[Node].begin();
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103 }
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104 succ_iterator_ty succ_end(change_ty Node) {
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105 assert(Successors.count(Node) && "Invalid node!");
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106 return Successors[Node].end();
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107 }
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108
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109 succ_closure_iterator_ty succ_closure_begin(change_ty Node) {
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110 assert(SuccClosure.count(Node) && "Invalid node!");
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111 return SuccClosure[Node].begin();
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112 }
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113 succ_closure_iterator_ty succ_closure_end(change_ty Node) {
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114 assert(SuccClosure.count(Node) && "Invalid node!");
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115 return SuccClosure[Node].end();
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116 }
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117
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118 void UpdatedSearchState(const changeset_ty &Changes,
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119 const changesetlist_ty &Sets,
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120 const changeset_ty &Required) {
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121 DDA.UpdatedSearchState(Changes, Sets, Required);
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122 }
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123
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124 /// ExecuteOneTest - Execute a single test predicate on the change set \p S.
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125 bool ExecuteOneTest(const changeset_ty &S) {
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126 // Check dependencies invariant.
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127 DEBUG({
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128 for (changeset_ty::const_iterator it = S.begin(),
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129 ie = S.end(); it != ie; ++it)
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130 for (succ_iterator_ty it2 = succ_begin(*it),
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131 ie2 = succ_end(*it); it2 != ie2; ++it2)
95c75e76d11b LLVM 3.4
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diff changeset
132 assert(S.count(*it2) && "Attempt to run invalid changeset!");
95c75e76d11b LLVM 3.4
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diff changeset
133 });
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diff changeset
134
95c75e76d11b LLVM 3.4
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diff changeset
135 return DDA.ExecuteOneTest(S);
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parents:
diff changeset
136 }
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diff changeset
137
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diff changeset
138 public:
95
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parents: 77
diff changeset
139 DAGDeltaAlgorithmImpl(DAGDeltaAlgorithm &DDA, const changeset_ty &Changes,
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140 const std::vector<edge_ty> &Dependencies);
0
95c75e76d11b LLVM 3.4
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141
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diff changeset
142 changeset_ty Run();
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diff changeset
143
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144 /// GetTestResult - Get the test result for the active set \p Changes with
95c75e76d11b LLVM 3.4
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diff changeset
145 /// \p Required changes from the cache, executing the test if necessary.
95c75e76d11b LLVM 3.4
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diff changeset
146 ///
95c75e76d11b LLVM 3.4
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diff changeset
147 /// \param Changes - The set of active changes being minimized, which should
95c75e76d11b LLVM 3.4
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diff changeset
148 /// have their pred closure included in the test.
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diff changeset
149 /// \param Required - The set of changes which have previously been
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150 /// established to be required.
95c75e76d11b LLVM 3.4
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diff changeset
151 /// \return - The test result.
95c75e76d11b LLVM 3.4
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diff changeset
152 bool GetTestResult(const changeset_ty &Changes, const changeset_ty &Required);
95c75e76d11b LLVM 3.4
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153 };
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parents:
diff changeset
154
95c75e76d11b LLVM 3.4
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155 /// Helper object for minimizing an active set of changes.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 class DeltaActiveSetHelper : public DeltaAlgorithm {
95c75e76d11b LLVM 3.4
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diff changeset
157 DAGDeltaAlgorithmImpl &DDAI;
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diff changeset
158
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diff changeset
159 const changeset_ty &Required;
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parents:
diff changeset
160
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diff changeset
161 protected:
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162 /// UpdatedSearchState - Callback used when the search state changes.
77
54457678186b LLVM 3.6
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parents: 0
diff changeset
163 void UpdatedSearchState(const changeset_ty &Changes,
54457678186b LLVM 3.6
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parents: 0
diff changeset
164 const changesetlist_ty &Sets) override {
0
95c75e76d11b LLVM 3.4
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diff changeset
165 DDAI.UpdatedSearchState(Changes, Sets, Required);
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diff changeset
166 }
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parents:
diff changeset
167
77
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diff changeset
168 bool ExecuteOneTest(const changeset_ty &S) override {
0
95c75e76d11b LLVM 3.4
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diff changeset
169 return DDAI.GetTestResult(S, Required);
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170 }
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parents:
diff changeset
171
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diff changeset
172 public:
95
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parents: 77
diff changeset
173 DeltaActiveSetHelper(DAGDeltaAlgorithmImpl &DDAI,
afa8332a0e37 LLVM 3.8
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parents: 77
diff changeset
174 const changeset_ty &Required)
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diff changeset
175 : DDAI(DDAI), Required(Required) {}
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
176 };
95c75e76d11b LLVM 3.4
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parents:
diff changeset
177
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diff changeset
178 }
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diff changeset
179
95
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diff changeset
180 DAGDeltaAlgorithmImpl::DAGDeltaAlgorithmImpl(
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parents: 77
diff changeset
181 DAGDeltaAlgorithm &DDA, const changeset_ty &Changes,
afa8332a0e37 LLVM 3.8
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parents: 77
diff changeset
182 const std::vector<edge_ty> &Dependencies)
afa8332a0e37 LLVM 3.8
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parents: 77
diff changeset
183 : DDA(DDA) {
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 for (changeset_ty::const_iterator it = Changes.begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 ie = Changes.end(); it != ie; ++it) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 Predecessors.insert(std::make_pair(*it, std::vector<change_ty>()));
95c75e76d11b LLVM 3.4
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parents:
diff changeset
187 Successors.insert(std::make_pair(*it, std::vector<change_ty>()));
95c75e76d11b LLVM 3.4
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parents:
diff changeset
188 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
189 for (std::vector<edge_ty>::const_iterator it = Dependencies.begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 ie = Dependencies.end(); it != ie; ++it) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 Predecessors[it->second].push_back(it->first);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
192 Successors[it->first].push_back(it->second);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
193 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
194
95c75e76d11b LLVM 3.4
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parents:
diff changeset
195 // Compute the roots.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
196 for (changeset_ty::const_iterator it = Changes.begin(),
95c75e76d11b LLVM 3.4
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parents:
diff changeset
197 ie = Changes.end(); it != ie; ++it)
95c75e76d11b LLVM 3.4
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parents:
diff changeset
198 if (succ_begin(*it) == succ_end(*it))
95c75e76d11b LLVM 3.4
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parents:
diff changeset
199 Roots.push_back(*it);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
200
95c75e76d11b LLVM 3.4
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diff changeset
201 // Pre-compute the closure of the successor relation.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 std::vector<change_ty> Worklist(Roots.begin(), Roots.end());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 while (!Worklist.empty()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
204 change_ty Change = Worklist.back();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
205 Worklist.pop_back();
95c75e76d11b LLVM 3.4
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parents:
diff changeset
206
95c75e76d11b LLVM 3.4
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parents:
diff changeset
207 std::set<change_ty> &ChangeSuccs = SuccClosure[Change];
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208 for (pred_iterator_ty it = pred_begin(Change),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
209 ie = pred_end(Change); it != ie; ++it) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
210 SuccClosure[*it].insert(Change);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 SuccClosure[*it].insert(ChangeSuccs.begin(), ChangeSuccs.end());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 Worklist.push_back(*it);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
213 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
214 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
215
95c75e76d11b LLVM 3.4
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parents:
diff changeset
216 // Invert to form the predecessor closure map.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
217 for (changeset_ty::const_iterator it = Changes.begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
218 ie = Changes.end(); it != ie; ++it)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
219 PredClosure.insert(std::make_pair(*it, std::set<change_ty>()));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
220 for (changeset_ty::const_iterator it = Changes.begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
221 ie = Changes.end(); it != ie; ++it)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
222 for (succ_closure_iterator_ty it2 = succ_closure_begin(*it),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
223 ie2 = succ_closure_end(*it); it2 != ie2; ++it2)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
224 PredClosure[*it2].insert(*it);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
225
95c75e76d11b LLVM 3.4
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parents:
diff changeset
226 // Dump useful debug info.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
227 DEBUG({
95c75e76d11b LLVM 3.4
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parents:
diff changeset
228 llvm::errs() << "-- DAGDeltaAlgorithmImpl --\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
229 llvm::errs() << "Changes: [";
95c75e76d11b LLVM 3.4
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parents:
diff changeset
230 for (changeset_ty::const_iterator it = Changes.begin(),
95c75e76d11b LLVM 3.4
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parents:
diff changeset
231 ie = Changes.end(); it != ie; ++it) {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
232 if (it != Changes.begin()) llvm::errs() << ", ";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
233 llvm::errs() << *it;
95c75e76d11b LLVM 3.4
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parents:
diff changeset
234
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 if (succ_begin(*it) != succ_end(*it)) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
236 llvm::errs() << "(";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
237 for (succ_iterator_ty it2 = succ_begin(*it),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
238 ie2 = succ_end(*it); it2 != ie2; ++it2) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 if (it2 != succ_begin(*it)) llvm::errs() << ", ";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
240 llvm::errs() << "->" << *it2;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 llvm::errs() << ")";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
243 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
244 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
245 llvm::errs() << "]\n";
95c75e76d11b LLVM 3.4
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parents:
diff changeset
246
95c75e76d11b LLVM 3.4
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parents:
diff changeset
247 llvm::errs() << "Roots: [";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
248 for (std::vector<change_ty>::const_iterator it = Roots.begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
249 ie = Roots.end(); it != ie; ++it) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
250 if (it != Roots.begin()) llvm::errs() << ", ";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
251 llvm::errs() << *it;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
252 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
253 llvm::errs() << "]\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
255 llvm::errs() << "Predecessor Closure:\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
256 for (changeset_ty::const_iterator it = Changes.begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
257 ie = Changes.end(); it != ie; ++it) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
258 llvm::errs() << format(" %-4d: [", *it);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
259 for (pred_closure_iterator_ty it2 = pred_closure_begin(*it),
95c75e76d11b LLVM 3.4
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parents:
diff changeset
260 ie2 = pred_closure_end(*it); it2 != ie2; ++it2) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
261 if (it2 != pred_closure_begin(*it)) llvm::errs() << ", ";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
262 llvm::errs() << *it2;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
263 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
264 llvm::errs() << "]\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
265 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
266
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
267 llvm::errs() << "Successor Closure:\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
268 for (changeset_ty::const_iterator it = Changes.begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
269 ie = Changes.end(); it != ie; ++it) {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
270 llvm::errs() << format(" %-4d: [", *it);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
271 for (succ_closure_iterator_ty it2 = succ_closure_begin(*it),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
272 ie2 = succ_closure_end(*it); it2 != ie2; ++it2) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
273 if (it2 != succ_closure_begin(*it)) llvm::errs() << ", ";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
274 llvm::errs() << *it2;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
275 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
276 llvm::errs() << "]\n";
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
277 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
278
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diff changeset
279 llvm::errs() << "\n\n";
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
280 });
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
281 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
282
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
283 bool DAGDeltaAlgorithmImpl::GetTestResult(const changeset_ty &Changes,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
284 const changeset_ty &Required) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
285 changeset_ty Extended(Required);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
286 Extended.insert(Changes.begin(), Changes.end());
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
287 for (changeset_ty::const_iterator it = Changes.begin(),
95c75e76d11b LLVM 3.4
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parents:
diff changeset
288 ie = Changes.end(); it != ie; ++it)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
289 Extended.insert(pred_closure_begin(*it), pred_closure_end(*it));
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
290
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
291 if (FailedTestsCache.count(Extended))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
292 return false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
293
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
294 bool Result = ExecuteOneTest(Extended);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
295 if (!Result)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
296 FailedTestsCache.insert(Extended);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
297
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
298 return Result;
95c75e76d11b LLVM 3.4
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parents:
diff changeset
299 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
300
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
301 DAGDeltaAlgorithm::changeset_ty
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
302 DAGDeltaAlgorithmImpl::Run() {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
303 // The current set of changes we are minimizing, starting at the roots.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
304 changeset_ty CurrentSet(Roots.begin(), Roots.end());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
305
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
306 // The set of required changes.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
307 changeset_ty Required;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
308
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
309 // Iterate until the active set of changes is empty. Convergence is guaranteed
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
310 // assuming input was a DAG.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
311 //
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
312 // Invariant: CurrentSet intersect Required == {}
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
313 // Invariant: Required == (Required union succ*(Required))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
314 while (!CurrentSet.empty()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
315 DEBUG({
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
316 llvm::errs() << "DAG_DD - " << CurrentSet.size() << " active changes, "
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
317 << Required.size() << " required changes\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
318 });
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
319
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
320 // Minimize the current set of changes.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
321 DeltaActiveSetHelper Helper(*this, Required);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
322 changeset_ty CurrentMinSet = Helper.Run(CurrentSet);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
323
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
324 // Update the set of required changes. Since
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
325 // CurrentMinSet subset CurrentSet
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
326 // and after the last iteration,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
327 // succ(CurrentSet) subset Required
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
328 // then
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
329 // succ(CurrentMinSet) subset Required
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
330 // and our invariant on Required is maintained.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
331 Required.insert(CurrentMinSet.begin(), CurrentMinSet.end());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
332
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
333 // Replace the current set with the predecssors of the minimized set of
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
334 // active changes.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
335 CurrentSet.clear();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
336 for (changeset_ty::const_iterator it = CurrentMinSet.begin(),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
337 ie = CurrentMinSet.end(); it != ie; ++it)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
338 CurrentSet.insert(pred_begin(*it), pred_end(*it));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
339
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
340 // FIXME: We could enforce CurrentSet intersect Required == {} here if we
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
341 // wanted to protect against cyclic graphs.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
342 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
343
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
344 return Required;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
345 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
346
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
347 void DAGDeltaAlgorithm::anchor() {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
348 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
349
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
350 DAGDeltaAlgorithm::changeset_ty
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
351 DAGDeltaAlgorithm::Run(const changeset_ty &Changes,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
352 const std::vector<edge_ty> &Dependencies) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
353 return DAGDeltaAlgorithmImpl(*this, Changes, Dependencies).Run();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
354 }