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1 // Copyright 2013 the V8 project authors. All rights reserved. | 1 // Copyright 2013 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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34 #include "zone.h" | 34 #include "zone.h" |
35 | 35 |
36 namespace v8 { | 36 namespace v8 { |
37 namespace internal { | 37 namespace internal { |
38 | 38 |
39 // Perform common subexpression elimination and loop-invariant code motion. | 39 // Perform common subexpression elimination and loop-invariant code motion. |
40 class HGlobalValueNumberingPhase : public HPhase { | 40 class HGlobalValueNumberingPhase : public HPhase { |
41 public: | 41 public: |
42 explicit HGlobalValueNumberingPhase(HGraph* graph); | 42 explicit HGlobalValueNumberingPhase(HGraph* graph); |
43 | 43 |
44 void Run() { | 44 void Run(); |
45 int max_fixpoint_iteration_count = FLAG_gvn_iterations; | |
46 for (int i = 0; i < max_fixpoint_iteration_count; i++) { | |
47 Analyze(); | |
48 if (!removed_side_effects_) break; | |
49 Reset(); | |
50 } | |
51 } | |
52 | 45 |
53 private: | 46 private: |
54 void Reset(); | |
55 void Analyze(); | |
56 GVNFlagSet CollectSideEffectsOnPathsToDominatedBlock( | 47 GVNFlagSet CollectSideEffectsOnPathsToDominatedBlock( |
57 HBasicBlock* dominator, | 48 HBasicBlock* dominator, |
58 HBasicBlock* dominated); | 49 HBasicBlock* dominated); |
59 void AnalyzeGraph(); | 50 void AnalyzeGraph(); |
60 void ComputeBlockSideEffects(); | 51 void ComputeBlockSideEffects(); |
61 void LoopInvariantCodeMotion(); | 52 void LoopInvariantCodeMotion(); |
62 void ProcessLoopBlock(HBasicBlock* block, | 53 void ProcessLoopBlock(HBasicBlock* block, |
63 HBasicBlock* before_loop, | 54 HBasicBlock* before_loop, |
64 GVNFlagSet loop_kills, | 55 GVNFlagSet loop_kills, |
65 GVNFlagSet* accumulated_first_time_depends, | 56 GVNFlagSet* accumulated_first_time_depends, |
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79 // dominated. | 70 // dominated. |
80 BitVector visited_on_paths_; | 71 BitVector visited_on_paths_; |
81 | 72 |
82 DISALLOW_COPY_AND_ASSIGN(HGlobalValueNumberingPhase); | 73 DISALLOW_COPY_AND_ASSIGN(HGlobalValueNumberingPhase); |
83 }; | 74 }; |
84 | 75 |
85 | 76 |
86 } } // namespace v8::internal | 77 } } // namespace v8::internal |
87 | 78 |
88 #endif // V8_HYDROGEN_GVN_H_ | 79 #endif // V8_HYDROGEN_GVN_H_ |
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