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| 1 // Copyright 2013 the V8 project authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef V8_HYDROGEN_RANGE_ANALYSIS_H_ | |
| 6 #define V8_HYDROGEN_RANGE_ANALYSIS_H_ | |
| 7 | |
| 8 #include "src/hydrogen.h" | |
| 9 | |
| 10 namespace v8 { | |
| 11 namespace internal { | |
| 12 | |
| 13 | |
| 14 class HRangeAnalysisPhase : public HPhase { | |
| 15 public: | |
| 16 explicit HRangeAnalysisPhase(HGraph* graph) | |
| 17 : HPhase("H_Range analysis", graph), changed_ranges_(16, zone()), | |
| 18 in_worklist_(graph->GetMaximumValueID(), zone()), | |
| 19 worklist_(32, zone()) {} | |
| 20 | |
| 21 void Run(); | |
| 22 | |
| 23 private: | |
| 24 void TraceRange(const char* msg, ...); | |
| 25 void InferControlFlowRange(HCompareNumericAndBranch* test, | |
| 26 HBasicBlock* dest); | |
| 27 void UpdateControlFlowRange(Token::Value op, HValue* value, HValue* other); | |
| 28 void InferRange(HValue* value); | |
| 29 void RollBackTo(int index); | |
| 30 void AddRange(HValue* value, Range* range); | |
| 31 void AddToWorklist(HValue* value) { | |
| 32 if (in_worklist_.Contains(value->id())) return; | |
| 33 in_worklist_.Add(value->id()); | |
| 34 worklist_.Add(value, zone()); | |
| 35 } | |
| 36 void PropagateMinusZeroChecks(HValue* value); | |
| 37 void PoisonRanges(); | |
| 38 | |
| 39 ZoneList<HValue*> changed_ranges_; | |
| 40 | |
| 41 BitVector in_worklist_; | |
| 42 ZoneList<HValue*> worklist_; | |
| 43 | |
| 44 DISALLOW_COPY_AND_ASSIGN(HRangeAnalysisPhase); | |
| 45 }; | |
| 46 | |
| 47 | |
| 48 } // namespace internal | |
| 49 } // namespace v8 | |
| 50 | |
| 51 #endif // V8_HYDROGEN_RANGE_ANALYSIS_H_ | |
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