InlineCallFrame* inlineCallFrame;

unsigned argumentPositionStart;

VariableAccessData* calleeVariable;

DontSpeculateInt32,

SpeculateInt32AndTruncateConstants,

SpeculateInt32

Graph(VM&, Plan&, LongLivedState&);

~Graph();

void changeChild(Edge& edge, Node* newNode)

{

edge.setNode(newNode);

}

void changeEdge(Edge& edge, Edge newEdge)

{

edge = newEdge;

}

void compareAndSwap(Edge& edge, Node* oldNode, Node* newNode)

{

if (edge.node() != oldNode)

return;

changeChild(edge, newNode);

}

void compareAndSwap(Edge& edge, Edge oldEdge, Edge newEdge)

{

if (edge != oldEdge)

return;

changeEdge(edge, newEdge);

}

void performSubstitution(Node* node)

{

if (node->flags() & NodeHasVarArgs) {

for (unsigned childIdx = node->firstChild(); childIdx < node->firstChild() + node->numChildren(); childIdx++)

performSubstitutionForEdge(m_varArgChildren[childIdx]);

} else {

performSubstitutionForEdge(node->child1());

performSubstitutionForEdge(node->child2());

performSubstitutionForEdge(node->child3());

}

}

void performSubstitutionForEdge(Edge& child)

{

// Check if this operand is actually unused.

if (!child)

return;

// Check if there is any replacement.

Node* replacement = child->misc.replacement;

if (!replacement)

return;

child.setNode(replacement);

// There is definitely a replacement. Assert that the replacement does not

// have a replacement.

ASSERT(!child->misc.replacement);

}

#define DFG_DEFINE_ADD_NODE(templatePre, templatePost, typeParams, valueParamsComma, valueParams, valueArgs) \

templatePre typeParams templatePost Node* addNode(SpeculatedType type valueParamsComma valueParams) \

{ \

Node* node = new (m_allocator) Node(valueArgs); \

node->predict(type); \

return node; \

}

DFG_VARIADIC_TEMPLATE_FUNCTION(DFG_DEFINE_ADD_NODE)

#undef DFG_DEFINE_ADD_NODE

void dethread();

void convertToConstant(Node* node, unsigned constantNumber)

{

if (node->op() == GetLocal)

dethread();

else

ASSERT(!node->hasVariableAccessData(*this));

node->convertToConstant(constantNumber);

}

unsigned constantRegisterForConstant(JSValue value)

{

unsigned constantRegister;

if (!m_codeBlock->findConstant(value, constantRegister)) {

constantRegister = m_codeBlock->addConstantLazily();

initializeLazyWriteBarrierForConstant(

m_plan.writeBarriers,

m_codeBlock->constants()[constantRegister],

m_codeBlock,

constantRegister,

m_codeBlock->ownerExecutable(),

value);

}

return constantRegister;

}

void convertToConstant(Node* node, JSValue value)

{

convertToConstant(node, constantRegisterForConstant(value));

}

// CodeBlock is optional, but may allow additional information to be dumped (e.g. Identifier names).

void dump(PrintStream& = WTF::dataFile(), DumpContext* = 0);

enum PhiNodeDumpMode { DumpLivePhisOnly, DumpAllPhis };

void dumpBlockHeader(PrintStream&, const char* prefix, BasicBlock*, PhiNodeDumpMode, DumpContext* context);

void dump(PrintStream&, Edge);

void dump(PrintStream&, const char* prefix, Node*, DumpContext* = 0);

static int amountOfNodeWhiteSpace(Node*);

static void printNodeWhiteSpace(PrintStream&, Node*);

// Dump the code origin of the given node as a diff from the code origin of the

// preceding node. Returns true if anything was printed.

bool dumpCodeOrigin(PrintStream&, const char* prefix, Node* previousNode, Node* currentNode, DumpContext* context);

SpeculatedType getJSConstantSpeculation(Node* node)

{

return speculationFromValue(node->valueOfJSConstant(m_codeBlock));

}

AddSpeculationMode addSpeculationMode(Node* add, bool leftShouldSpeculateInt32, bool rightShouldSpeculateInt32)

{

ASSERT(add->op() == ValueAdd || add->op() == ArithAdd || add->op() == ArithSub);

Node* left = add->child1().node();

Node* right = add->child2().node();

if (left->hasConstant())

return addImmediateShouldSpeculateInt32(add, rightShouldSpeculateInt32, left);

if (right->hasConstant())

return addImmediateShouldSpeculateInt32(add, leftShouldSpeculateInt32, right);

return (leftShouldSpeculateInt32 && rightShouldSpeculateInt32 && add->canSpeculateInt32()) ? SpeculateInt32 : DontSpeculateInt32;

}

AddSpeculationMode valueAddSpeculationMode(Node* add)

{

return addSpeculationMode(add, add->child1()->shouldSpeculateInt32ExpectingDefined(), add->child2()->shouldSpeculateInt32ExpectingDefined());

}

AddSpeculationMode arithAddSpeculationMode(Node* add)

{

return addSpeculationMode(add, add->child1()->shouldSpeculateInt32ForArithmetic(), add->child2()->shouldSpeculateInt32ForArithmetic());

}

AddSpeculationMode addSpeculationMode(Node* add)

{

if (add->op() == ValueAdd)

return valueAddSpeculationMode(add);

return arithAddSpeculationMode(add);

}

bool addShouldSpeculateInt32(Node* add)

{

return addSpeculationMode(add) != DontSpeculateInt32;

}

bool addShouldSpeculateMachineInt(Node* add)

{

if (!enableInt52())

return false;

Node* left = add->child1().node();

Node* right = add->child2().node();

bool speculation;

if (add->op() == ValueAdd)

speculation = Node::shouldSpeculateMachineInt(left, right);

else

speculation = Node::shouldSpeculateMachineInt(left, right);

return speculation && !hasExitSite(add, Int52Overflow);

}

bool mulShouldSpeculateInt32(Node* mul)

{

ASSERT(mul->op() == ArithMul);

Node* left = mul->child1().node();

Node* right = mul->child2().node();

return Node::shouldSpeculateInt32ForArithmetic(left, right)

&& mul->canSpeculateInt32();

}

bool mulShouldSpeculateMachineInt(Node* mul)

{

ASSERT(mul->op() == ArithMul);

if (!enableInt52())

return false;

Node* left = mul->child1().node();

Node* right = mul->child2().node();

return Node::shouldSpeculateMachineInt(left, right)

&& mul->canSpeculateInt52()

&& !hasExitSite(mul, Int52Overflow);

}

bool negateShouldSpeculateInt32(Node* negate)

{

ASSERT(negate->op() == ArithNegate);

return negate->child1()->shouldSpeculateInt32ForArithmetic() && negate->canSpeculateInt32();

}

bool negateShouldSpeculateMachineInt(Node* negate)

{

ASSERT(negate->op() == ArithNegate);

if (!enableInt52())

return false;

return negate->child1()->shouldSpeculateMachineInt()

&& !hasExitSite(negate, Int52Overflow)

&& negate->canSpeculateInt52();

}

VirtualRegister bytecodeRegisterForArgument(CodeOrigin codeOrigin, int argument)

{

return VirtualRegister(

codeOrigin.inlineCallFrame->stackOffset +

baselineCodeBlockFor(codeOrigin)->argumentIndexAfterCapture(argument));

}

// Helper methods to check nodes for constants.

bool isConstant(Node* node)

{

return node->hasConstant();

}

bool isJSConstant(Node* node)

{

return node->hasConstant();

}

bool isInt32Constant(Node* node)

{

return node->isInt32Constant(m_codeBlock);

}

bool isDoubleConstant(Node* node)

{

return node->isDoubleConstant(m_codeBlock);

}

bool isNumberConstant(Node* node)

{

return node->isNumberConstant(m_codeBlock);

}

bool isBooleanConstant(Node* node)

{

return node->isBooleanConstant(m_codeBlock);

}

bool isCellConstant(Node* node)

{

if (!isJSConstant(node))

return false;

JSValue value = valueOfJSConstant(node);

return value.isCell() && !!value;

}

bool isFunctionConstant(Node* node)

{

if (!isJSConstant(node))

return false;

if (!getJSFunction(valueOfJSConstant(node)))

return false;

return true;

}

bool isInternalFunctionConstant(Node* node)

{

if (!isJSConstant(node))

return false;

JSValue value = valueOfJSConstant(node);

if (!value.isCell() || !value)

return false;

JSCell* cell = value.asCell();

if (!cell->inherits(InternalFunction::info()))

return false;

return true;

}

// Helper methods get constant values from nodes.

JSValue valueOfJSConstant(Node* node)

{

return node->valueOfJSConstant(m_codeBlock);

}

int32_t valueOfInt32Constant(Node* node)

{

return valueOfJSConstant(node).asInt32();

}

double valueOfNumberConstant(Node* node)

{

return valueOfJSConstant(node).asNumber();

}

bool valueOfBooleanConstant(Node* node)

{

return valueOfJSConstant(node).asBoolean();

}

JSFunction* valueOfFunctionConstant(Node* node)

{

JSCell* function = getJSFunction(valueOfJSConstant(node));

ASSERT(function);

return jsCast<JSFunction*>(function);

}

static const char *opName(NodeType);

StructureSet* addStructureSet(const StructureSet& structureSet)

{

ASSERT(structureSet.size());

m_structureSet.append(structureSet);

return &m_structureSet.last();

}

StructureTransitionData* addStructureTransitionData(const StructureTransitionData& structureTransitionData)

{

m_structureTransitionData.append(structureTransitionData);

return &m_structureTransitionData.last();

}

JSGlobalObject* globalObjectFor(CodeOrigin codeOrigin)

{

return m_codeBlock->globalObjectFor(codeOrigin);

}

JSObject* globalThisObjectFor(CodeOrigin codeOrigin)

{

JSGlobalObject* object = globalObjectFor(codeOrigin);

return jsCast<JSObject*>(object->methodTable()->toThis(object, object->globalExec(), NotStrictMode));

}

ScriptExecutable* executableFor(InlineCallFrame* inlineCallFrame)

{

if (!inlineCallFrame)

return m_codeBlock->ownerExecutable();

return inlineCallFrame->executable.get();

}

ScriptExecutable* executableFor(const CodeOrigin& codeOrigin)

{

return executableFor(codeOrigin.inlineCallFrame);

}

CodeBlock* baselineCodeBlockFor(InlineCallFrame* inlineCallFrame)

{

if (!inlineCallFrame)

return m_profiledBlock;

return baselineCodeBlockForInlineCallFrame(inlineCallFrame);

}

CodeBlock* baselineCodeBlockFor(const CodeOrigin& codeOrigin)

{

return baselineCodeBlockForOriginAndBaselineCodeBlock(codeOrigin, m_profiledBlock);

}

bool isStrictModeFor(CodeOrigin codeOrigin)

{

if (!codeOrigin.inlineCallFrame)

return m_codeBlock->isStrictMode();

return jsCast<FunctionExecutable*>(codeOrigin.inlineCallFrame->executable.get())->isStrictMode();

}

ECMAMode ecmaModeFor(CodeOrigin codeOrigin)

{

return isStrictModeFor(codeOrigin) ? StrictMode : NotStrictMode;

}

bool masqueradesAsUndefinedWatchpointIsStillValid(const CodeOrigin& codeOrigin)

{

return m_plan.watchpoints.isStillValid(

globalObjectFor(codeOrigin)->masqueradesAsUndefinedWatchpoint());

}

bool hasGlobalExitSite(const CodeOrigin& codeOrigin, ExitKind exitKind)

{

return baselineCodeBlockFor(codeOrigin)->hasExitSite(FrequentExitSite(exitKind));

}

bool hasExitSite(const CodeOrigin& codeOrigin, ExitKind exitKind)

{

return baselineCodeBlockFor(codeOrigin)->hasExitSite(FrequentExitSite(codeOrigin.bytecodeIndex, exitKind));

}

bool hasExitSite(Node* node, ExitKind exitKind)

{

return hasExitSite(node->codeOrigin, exitKind);

}

VirtualRegister argumentsRegisterFor(InlineCallFrame* inlineCallFrame)

{

if (!inlineCallFrame)

return m_profiledBlock->argumentsRegister();

return VirtualRegister(baselineCodeBlockForInlineCallFrame(

inlineCallFrame)->argumentsRegister().offset() +

inlineCallFrame->stackOffset);

}

VirtualRegister argumentsRegisterFor(const CodeOrigin& codeOrigin)

{

return argumentsRegisterFor(codeOrigin.inlineCallFrame);

}

VirtualRegister machineArgumentsRegisterFor(InlineCallFrame* inlineCallFrame)

{

if (!inlineCallFrame)

return m_codeBlock->argumentsRegister();

return inlineCallFrame->argumentsRegister;

}

VirtualRegister machineArgumentsRegisterFor(const CodeOrigin& codeOrigin)

{

return machineArgumentsRegisterFor(codeOrigin.inlineCallFrame);

}

VirtualRegister uncheckedArgumentsRegisterFor(InlineCallFrame* inlineCallFrame)

{

if (!inlineCallFrame)

return m_profiledBlock->uncheckedArgumentsRegister();

CodeBlock* codeBlock = baselineCodeBlockForInlineCallFrame(inlineCallFrame);

if (!codeBlock->usesArguments())

return VirtualRegister();

return VirtualRegister(codeBlock->argumentsRegister().offset() +

inlineCallFrame->stackOffset);

}

VirtualRegister uncheckedArgumentsRegisterFor(const CodeOrigin& codeOrigin)

{

return uncheckedArgumentsRegisterFor(codeOrigin.inlineCallFrame);

}

VirtualRegister activationRegister()

{

return m_profiledBlock->activationRegister();

}

VirtualRegister uncheckedActivationRegister()

{

return m_profiledBlock->uncheckedActivationRegister();

}

VirtualRegister machineActivationRegister()

{

return m_profiledBlock->activationRegister();

}

VirtualRegister uncheckedMachineActivationRegister()

{

return m_profiledBlock->uncheckedActivationRegister();

}

ValueProfile* valueProfileFor(Node* node)

{

if (!node)

return 0;

CodeBlock* profiledBlock = baselineCodeBlockFor(node->codeOrigin);

if (node->op() == GetArgument)

return profiledBlock->valueProfileForArgument(node->local().toArgument());

if (node->hasLocal(*this)) {

if (m_form == SSA)

return 0;

if (!node->local().isArgument())

return 0;

int argument = node->local().toArgument();

if (node->variableAccessData() != m_arguments[argument]->variableAccessData())

return 0;

return profiledBlock->valueProfileForArgument(argument);

}

if (node->hasHeapPrediction())

return profiledBlock->valueProfileForBytecodeOffset(node->codeOrigin.bytecodeIndex);

return 0;

}

MethodOfGettingAValueProfile methodOfGettingAValueProfileFor(Node* node)

{

if (!node)

return MethodOfGettingAValueProfile();

CodeBlock* profiledBlock = baselineCodeBlockFor(node->codeOrigin);

if (node->op() == GetLocal) {

return MethodOfGettingAValueProfile::fromLazyOperand(

profiledBlock,

LazyOperandValueProfileKey(

node->codeOrigin.bytecodeIndex, node->local()));

}

return MethodOfGettingAValueProfile(valueProfileFor(node));

}

bool needsActivation() const

{

return m_codeBlock->needsFullScopeChain() && m_codeBlock->codeType() != GlobalCode;

}

bool usesArguments() const

{

return m_codeBlock->usesArguments();

}

BlockIndex numBlocks() const { return m_blocks.size(); }

BasicBlock* block(BlockIndex blockIndex) const { return m_blocks[blockIndex].get(); }

BasicBlock* lastBlock() const { return block(numBlocks() - 1); }

void appendBlock(PassRefPtr<BasicBlock> basicBlock)

{

basicBlock->index = m_blocks.size();

m_blocks.append(basicBlock);

}

void killBlock(BlockIndex blockIndex)

{

m_blocks[blockIndex].clear();

}

void killBlock(BasicBlock* basicBlock)

{

killBlock(basicBlock->index);

}

void killBlockAndItsContents(BasicBlock*);

void killUnreachableBlocks();

bool isPredictedNumerical(Node* node)

{

return isNumerical(node->child1().useKind()) && isNumerical(node->child2().useKind());

}

// Note that a 'true' return does not actually mean that the ByVal access clobbers nothing.

// It really means that it will not clobber the entire world. It's still up to you to

// carefully consider things like:

// - PutByVal definitely changes the array it stores to, and may even change its length.

// - PutByOffset definitely changes the object it stores to.

// - and so on.

bool byValIsPure(Node* node)

{

switch (node->arrayMode().type()) {

case Array::Generic:

return false;

case Array::Int32:

case Array::Double:

case Array::Contiguous:

case Array::ArrayStorage:

return !node->arrayMode().isOutOfBounds();

case Array::SlowPutArrayStorage:

return !node->arrayMode().mayStoreToHole();

case Array::String:

return node->op() == GetByVal && node->arrayMode().isInBounds();

#if USE(JSVALUE32_64)

case Array::Arguments:

if (node->op() == GetByVal)

return true;

return false;

#endif // USE(JSVALUE32_64)

default:

return true;

}

}

bool clobbersWorld(Node* node)

{

if (node->flags() & NodeClobbersWorld)

return true;

if (!(node->flags() & NodeMightClobber))

return false;

switch (node->op()) {

case GetByVal:

case PutByValDirect:

case PutByVal:

case PutByValAlias:

return !byValIsPure(node);

case ToString:

switch (node->child1().useKind()) {

case StringObjectUse:

case StringOrStringObjectUse:

return false;

case CellUse:

case UntypedUse:

return true;

default:

RELEASE_ASSERT_NOT_REACHED();

return true;

}

default:

RELEASE_ASSERT_NOT_REACHED();

return true; // If by some oddity we hit this case in release build it's safer to have CSE assume the worst.

}

}

void determineReachability();

void resetReachability();

void resetExitStates();

unsigned varArgNumChildren(Node* node)

{

ASSERT(node->flags() & NodeHasVarArgs);

return node->numChildren();

}

unsigned numChildren(Node* node)

{

if (node->flags() & NodeHasVarArgs)

return varArgNumChildren(node);

return AdjacencyList::Size;

}

Edge& varArgChild(Node* node, unsigned index)

{

ASSERT(node->flags() & NodeHasVarArgs);

return m_varArgChildren[node->firstChild() + index];

}

Edge& child(Node* node, unsigned index)

{

if (node->flags() & NodeHasVarArgs)

return varArgChild(node, index);

return node->children.child(index);

}

void voteNode(Node* node, unsigned ballot)

{

switch (node->op()) {

case ValueToInt32:

case UInt32ToNumber:

node = node->child1().node();

break;

default:

break;

}

if (node->op() == GetLocal)

node->variableAccessData()->vote(ballot);

}

void voteNode(Edge edge, unsigned ballot)

{

voteNode(edge.node(), ballot);

}

void voteChildren(Node* node, unsigned ballot)

{

if (node->flags() & NodeHasVarArgs) {

for (unsigned childIdx = node->firstChild();

childIdx < node->firstChild() + node->numChildren();

childIdx++) {

if (!!m_varArgChildren[childIdx])

voteNode(m_varArgChildren[childIdx], ballot);

}

return;

}

if (!node->child1())

return;

voteNode(node->child1(), ballot);

if (!node->child2())

return;

voteNode(node->child2(), ballot);

if (!node->child3())

return;

voteNode(node->child3(), ballot);

}

template<typename T> // T = Node* or Edge

void substitute(BasicBlock& block, unsigned startIndexInBlock, T oldThing, T newThing)

{

for (unsigned indexInBlock = startIndexInBlock; indexInBlock < block.size(); ++indexInBlock) {

Node* node = block[indexInBlock];

if (node->flags() & NodeHasVarArgs) {

for (unsigned childIdx = node->firstChild(); childIdx < node->firstChild() + node->numChildren(); ++childIdx) {

if (!!m_varArgChildren[childIdx])

compareAndSwap(m_varArgChildren[childIdx], oldThing, newThing);

}

continue;

}

if (!node->child1())

continue;

compareAndSwap(node->children.child1(), oldThing, newThing);

if (!node->child2())

continue;

compareAndSwap(node->children.child2(), oldThing, newThing);

if (!node->child3())

continue;

compareAndSwap(node->children.child3(), oldThing, newThing);

}

}

// Use this if you introduce a new GetLocal and you know that you introduced it *before*

// any GetLocals in the basic block.

// FIXME: it may be appropriate, in the future, to generalize this to handle GetLocals

// introduced anywhere in the basic block.

void substituteGetLocal(BasicBlock& block, unsigned startIndexInBlock, VariableAccessData* variableAccessData, Node* newGetLocal);

void invalidateCFG();

void clearReplacements();

void initializeNodeOwners();

void getBlocksInDepthFirstOrder(Vector<BasicBlock*>& result);

Profiler::Compilation* compilation() { return m_plan.compilation.get(); }

DesiredIdentifiers& identifiers() { return m_plan.identifiers; }

DesiredWatchpoints& watchpoints() { return m_plan.watchpoints; }

DesiredStructureChains& chains() { return m_plan.chains; }

FullBytecodeLiveness& livenessFor(CodeBlock*);

FullBytecodeLiveness& livenessFor(InlineCallFrame*);

bool isLiveInBytecode(VirtualRegister, CodeOrigin);

unsigned frameRegisterCount();

unsigned requiredRegisterCountForExit();

unsigned requiredRegisterCountForExecutionAndExit();

JSActivation* tryGetActivation(Node*);

WriteBarrierBase<Unknown>* tryGetRegisters(Node*);

JSArrayBufferView* tryGetFoldableView(Node*);

JSArrayBufferView* tryGetFoldableView(Node*, ArrayMode);

JSArrayBufferView* tryGetFoldableViewForChild1(Node*);

VM& m_vm;

Plan& m_plan;

CodeBlock* m_codeBlock;

CodeBlock* m_profiledBlock;

NodeAllocator& m_allocator;

Operands<AbstractValue> m_mustHandleAbstractValues;

Vector< RefPtr<BasicBlock> , 8> m_blocks;

Vector<Edge, 16> m_varArgChildren;

Vector<StorageAccessData> m_storageAccessData;

Vector<Node*, 8> m_arguments;

SegmentedVector<VariableAccessData, 16> m_variableAccessData;

SegmentedVector<ArgumentPosition, 8> m_argumentPositions;

SegmentedVector<StructureSet, 16> m_structureSet;

SegmentedVector<StructureTransitionData, 8> m_structureTransitionData;

SegmentedVector<NewArrayBufferData, 4> m_newArrayBufferData;

SegmentedVector<SwitchData, 4> m_switchData;

Vector<InlineVariableData, 4> m_inlineVariableData;

OwnPtr<InlineCallFrameSet> m_inlineCallFrames;

HashMap<CodeBlock*, std::unique_ptr<FullBytecodeLiveness>> m_bytecodeLiveness;

bool m_hasArguments;

HashSet<ExecutableBase*> m_executablesWhoseArgumentsEscaped;

BitVector m_lazyVars;

Dominators m_dominators;

NaturalLoops m_naturalLoops;

unsigned m_localVars;

unsigned m_nextMachineLocal;

unsigned m_parameterSlots;

int m_machineCaptureStart;

std::unique_ptr<SlowArgument[]> m_slowArguments;

OptimizationFixpointState m_fixpointState;

GraphForm m_form;

UnificationState m_unificationState;

RefCountState m_refCountState;

void handleSuccessor(Vector<BasicBlock*, 16>& worklist, BasicBlock*, BasicBlock* successor);

void addForDepthFirstSort(Vector<BasicBlock*>& result, Vector<BasicBlock*, 16>& worklist, HashSet<BasicBlock*>& seen, BasicBlock*);

AddSpeculationMode addImmediateShouldSpeculateInt32(Node* add, bool variableShouldSpeculateInt32, Node* immediate)

{

ASSERT(immediate->hasConstant());

JSValue immediateValue = immediate->valueOfJSConstant(m_codeBlock);

if (!immediateValue.isNumber())

return DontSpeculateInt32;

if (!variableShouldSpeculateInt32)

return DontSpeculateInt32;

if (immediateValue.isInt32())

return add->canSpeculateInt32() ? SpeculateInt32 : DontSpeculateInt32;

double doubleImmediate = immediateValue.asDouble();

const double twoToThe48 = 281474976710656.0;

if (doubleImmediate < -twoToThe48 || doubleImmediate > twoToThe48)

return DontSpeculateInt32;

return bytecodeCanTruncateInteger(add->arithNodeFlags()) ? SpeculateInt32AndTruncateConstants : DontSpeculateInt32;

}

bool mulImmediateShouldSpeculateInt32(Node* mul, Node* variable, Node* immediate)

{

ASSERT(immediate->hasConstant());

JSValue immediateValue = immediate->valueOfJSConstant(m_codeBlock);

if (!immediateValue.isInt32())

return false;

if (!variable->shouldSpeculateInt32ForArithmetic())

return false;

int32_t intImmediate = immediateValue.asInt32();

// Doubles have a 53 bit mantissa so we expect a multiplication of 2^31 (the highest

// magnitude possible int32 value) and any value less than 2^22 to not result in any

// rounding in a double multiplication - hence it will be equivalent to an integer

// multiplication, if we are doing int32 truncation afterwards (which is what

// canSpeculateInt32() implies).

const int32_t twoToThe22 = 1 << 22;

if (intImmediate <= -twoToThe22 || intImmediate >= twoToThe22)

return mul->canSpeculateInt32() && !nodeMayOverflow(mul->arithNodeFlags());

return mul->canSpeculateInt32();

}