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Issue 153563006: Cosmetic cleanup for GVN. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 6 years, 10 months ago
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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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