Upgrade V8 to version 4.9.385.28
https://chromium.googlesource.com/v8/v8/+/4.9.385.28
FPIIM-449
Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/src/crankshaft/hydrogen-dehoist.cc b/src/crankshaft/hydrogen-dehoist.cc
new file mode 100644
index 0000000..34de94a
--- /dev/null
+++ b/src/crankshaft/hydrogen-dehoist.cc
@@ -0,0 +1,72 @@
+// Copyright 2013 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/crankshaft/hydrogen-dehoist.h"
+
+#include "src/base/safe_math.h"
+
+namespace v8 {
+namespace internal {
+
+static void DehoistArrayIndex(ArrayInstructionInterface* array_operation) {
+ HValue* index = array_operation->GetKey()->ActualValue();
+ if (!index->representation().IsSmiOrInteger32()) return;
+ if (!index->IsAdd() && !index->IsSub()) return;
+
+ HConstant* constant;
+ HValue* subexpression;
+ HBinaryOperation* binary_operation = HBinaryOperation::cast(index);
+ if (binary_operation->left()->IsConstant() && index->IsAdd()) {
+ subexpression = binary_operation->right();
+ constant = HConstant::cast(binary_operation->left());
+ } else if (binary_operation->right()->IsConstant()) {
+ subexpression = binary_operation->left();
+ constant = HConstant::cast(binary_operation->right());
+ } else {
+ return;
+ }
+
+ if (!constant->HasInteger32Value()) return;
+ v8::base::internal::CheckedNumeric<int32_t> checked_value =
+ constant->Integer32Value();
+ int32_t sign = binary_operation->IsSub() ? -1 : 1;
+ checked_value = checked_value * sign;
+
+ // Multiply value by elements size, bailing out on overflow.
+ int32_t elements_kind_size =
+ 1 << ElementsKindToShiftSize(array_operation->elements_kind());
+ checked_value = checked_value * elements_kind_size;
+ if (!checked_value.IsValid()) return;
+ int32_t value = checked_value.ValueOrDie();
+ if (value < 0) return;
+
+ // Ensure that the array operation can add value to existing base offset
+ // without overflowing.
+ if (!array_operation->TryIncreaseBaseOffset(value)) return;
+
+ array_operation->SetKey(subexpression);
+ if (binary_operation->HasNoUses()) {
+ binary_operation->DeleteAndReplaceWith(NULL);
+ }
+
+ array_operation->SetDehoisted(true);
+}
+
+
+void HDehoistIndexComputationsPhase::Run() {
+ const ZoneList<HBasicBlock*>* blocks(graph()->blocks());
+ for (int i = 0; i < blocks->length(); ++i) {
+ for (HInstructionIterator it(blocks->at(i)); !it.Done(); it.Advance()) {
+ HInstruction* instr = it.Current();
+ if (instr->IsLoadKeyed()) {
+ DehoistArrayIndex(HLoadKeyed::cast(instr));
+ } else if (instr->IsStoreKeyed()) {
+ DehoistArrayIndex(HStoreKeyed::cast(instr));
+ }
+ }
+ }
+}
+
+} // namespace internal
+} // namespace v8