1169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// Copyright 2013 the V8 project authors. All rights reserved. 2169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// Redistribution and use in source and binary forms, with or without 3169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// modification, are permitted provided that the following conditions are 4169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// met: 5169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// 6169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// * Redistributions of source code must retain the above copyright 7169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// notice, this list of conditions and the following disclaimer. 8169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// * Redistributions in binary form must reproduce the above 9169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// copyright notice, this list of conditions and the following 10169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// disclaimer in the documentation and/or other materials provided 11169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// with the distribution. 12169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// * Neither the name of Google Inc. nor the names of its 13169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// contributors may be used to endorse or promote products derived 14169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// from this software without specific prior written permission. 15169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// 16169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org 28169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org#include "hydrogen-dehoist.h" 29169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org 30169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.orgnamespace v8 { 31169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.orgnamespace internal { 32169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org 33169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.orgstatic void DehoistArrayIndex(ArrayInstructionInterface* array_operation) { 34169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org HValue* index = array_operation->GetKey()->ActualValue(); 35169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org if (!index->representation().IsSmiOrInteger32()) return; 36169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org if (!index->IsAdd() && !index->IsSub()) return; 37169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org 38169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org HConstant* constant; 39169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org HValue* subexpression; 40169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org HBinaryOperation* binary_operation = HBinaryOperation::cast(index); 41c16e8281e6e3e3b57e157b62d5a1ca530e23e4bfdanno@chromium.org if (binary_operation->left()->IsConstant() && index->IsAdd()) { 42169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org subexpression = binary_operation->right(); 43169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org constant = HConstant::cast(binary_operation->left()); 44169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org } else if (binary_operation->right()->IsConstant()) { 45169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org subexpression = binary_operation->left(); 46169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org constant = HConstant::cast(binary_operation->right()); 47169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org } else { 48169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org return; 49169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org } 50169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org 51169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org if (!constant->HasInteger32Value()) return; 52169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org int32_t sign = binary_operation->IsSub() ? -1 : 1; 53169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org int32_t value = constant->Integer32Value() * sign; 54169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org // We limit offset values to 30 bits because we want to avoid the risk of 55169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org // overflows when the offset is added to the object header size. 56169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org if (value >= 1 << 30 || value < 0) return; 57169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org array_operation->SetKey(subexpression); 58169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org if (binary_operation->HasNoUses()) { 59169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org binary_operation->DeleteAndReplaceWith(NULL); 60169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org } 61169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org array_operation->SetIndexOffset(static_cast<uint32_t>(value)); 62169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org array_operation->SetDehoisted(true); 63169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org} 64169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org 65169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org 66169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.orgvoid HDehoistIndexComputationsPhase::Run() { 67169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org const ZoneList<HBasicBlock*>* blocks(graph()->blocks()); 68169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org for (int i = 0; i < blocks->length(); ++i) { 69169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org for (HInstructionIterator it(blocks->at(i)); !it.Done(); it.Advance()) { 70169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org HInstruction* instr = it.Current(); 71169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org if (instr->IsLoadKeyed()) { 72169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org DehoistArrayIndex(HLoadKeyed::cast(instr)); 73169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org } else if (instr->IsStoreKeyed()) { 74169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org DehoistArrayIndex(HStoreKeyed::cast(instr)); 75169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org } 76169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org } 77169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org } 78169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org} 79169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org 80169691d93a961c8b511f8ac8fd8ee33d081ca10fdanno@chromium.org} } // namespace v8::internal 81