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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 #include "src/hydrogen-mark-deoptimize.h" | |
| 6 | |
| 7 namespace v8 { | |
| 8 namespace internal { | |
| 9 | |
| 10 void HMarkDeoptimizeOnUndefinedPhase::Run() { | |
| 11 const ZoneList<HPhi*>* phi_list = graph()->phi_list(); | |
| 12 for (int i = 0; i < phi_list->length(); i++) { | |
| 13 HPhi* phi = phi_list->at(i); | |
| 14 if (phi->CheckFlag(HValue::kAllowUndefinedAsNaN) && | |
| 15 !phi->CheckUsesForFlag(HValue::kAllowUndefinedAsNaN)) { | |
| 16 ProcessPhi(phi); | |
| 17 } | |
| 18 } | |
| 19 } | |
| 20 | |
| 21 | |
| 22 void HMarkDeoptimizeOnUndefinedPhase::ProcessPhi(HPhi* phi) { | |
| 23 DCHECK(phi->CheckFlag(HValue::kAllowUndefinedAsNaN)); | |
| 24 DCHECK(worklist_.is_empty()); | |
| 25 | |
| 26 // Push the phi onto the worklist | |
| 27 phi->ClearFlag(HValue::kAllowUndefinedAsNaN); | |
| 28 worklist_.Add(phi, zone()); | |
| 29 | |
| 30 // Process all phis that can reach this phi | |
| 31 while (!worklist_.is_empty()) { | |
| 32 phi = worklist_.RemoveLast(); | |
| 33 for (int i = phi->OperandCount() - 1; i >= 0; --i) { | |
| 34 HValue* input = phi->OperandAt(i); | |
| 35 if (input->IsPhi() && input->CheckFlag(HValue::kAllowUndefinedAsNaN)) { | |
| 36 input->ClearFlag(HValue::kAllowUndefinedAsNaN); | |
| 37 worklist_.Add(HPhi::cast(input), zone()); | |
| 38 } | |
| 39 } | |
| 40 } | |
| 41 } | |
| 42 | |
| 43 | |
| 44 void HComputeChangeUndefinedToNaN::Run() { | |
| 45 const ZoneList<HBasicBlock*>* blocks(graph()->blocks()); | |
| 46 for (int i = 0; i < blocks->length(); ++i) { | |
| 47 const HBasicBlock* block(blocks->at(i)); | |
| 48 for (HInstruction* current = block->first(); current != NULL; ) { | |
| 49 HInstruction* next = current->next(); | |
| 50 if (current->IsChange()) { | |
| 51 if (HChange::cast(current)->can_convert_undefined_to_nan()) { | |
| 52 current->SetFlag(HValue::kAllowUndefinedAsNaN); | |
| 53 } | |
| 54 } | |
| 55 current = next; | |
| 56 } | |
| 57 } | |
| 58 } | |
| 59 | |
| 60 | |
| 61 } // namespace internal | |
| 62 } // namespace v8 | |
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