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.
5 #include "src/hydrogen-mark-deoptimize.h"
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)) {
22 void HMarkDeoptimizeOnUndefinedPhase::ProcessPhi(HPhi* phi) {
23 DCHECK(phi->CheckFlag(HValue::kAllowUndefinedAsNaN));
24 DCHECK(worklist_.is_empty());
26 // Push the phi onto the worklist
27 phi->ClearFlag(HValue::kAllowUndefinedAsNaN);
28 worklist_.Add(phi, zone());
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());
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);
61 } } // namespace v8::internal