169f5a9d7b
Only allow changing hole to nan if all uses allow undefined as nan. R=danno@chromium.org Review URL: https://chromiumcodereview.appspot.com/22152003 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16183 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
85 lines
3.2 KiB
C++
85 lines
3.2 KiB
C++
// Copyright 2013 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "hydrogen-mark-deoptimize.h"
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namespace v8 {
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namespace internal {
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void HMarkDeoptimizeOnUndefinedPhase::Run() {
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const ZoneList<HPhi*>* phi_list = graph()->phi_list();
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for (int i = 0; i < phi_list->length(); i++) {
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HPhi* phi = phi_list->at(i);
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if (phi->CheckFlag(HValue::kAllowUndefinedAsNaN) &&
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!phi->CheckUsesForFlag(HValue::kAllowUndefinedAsNaN)) {
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ProcessPhi(phi);
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}
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}
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}
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void HMarkDeoptimizeOnUndefinedPhase::ProcessPhi(HPhi* phi) {
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ASSERT(phi->CheckFlag(HValue::kAllowUndefinedAsNaN));
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ASSERT(worklist_.is_empty());
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// Push the phi onto the worklist
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phi->ClearFlag(HValue::kAllowUndefinedAsNaN);
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worklist_.Add(phi, zone());
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// Process all phis that can reach this phi
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while (!worklist_.is_empty()) {
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phi = worklist_.RemoveLast();
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for (int i = phi->OperandCount() - 1; i >= 0; --i) {
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HValue* input = phi->OperandAt(i);
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if (input->IsPhi() && input->CheckFlag(HValue::kAllowUndefinedAsNaN)) {
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input->ClearFlag(HValue::kAllowUndefinedAsNaN);
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worklist_.Add(HPhi::cast(input), zone());
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}
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}
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}
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}
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void HComputeChangeUndefinedToNaN::Run() {
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const ZoneList<HBasicBlock*>* blocks(graph()->blocks());
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for (int i = 0; i < blocks->length(); ++i) {
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const HBasicBlock* block(blocks->at(i));
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for (HInstruction* current = block->first(); current != NULL; ) {
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HInstruction* next = current->next();
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if (current->IsChange()) {
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if (HChange::cast(current)->can_convert_undefined_to_nan()) {
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current->SetFlag(HValue::kAllowUndefinedAsNaN);
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}
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}
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current = next;
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}
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}
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}
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} } // namespace v8::internal
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