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FTLLowerDFGToLLVM.cpp
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4515 lines (3712 loc) · 160 KB
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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "FTLLowerDFGToLLVM.h"
#if ENABLE(FTL_JIT)
#include "CodeBlockWithJITType.h"
#include "DFGAbstractInterpreterInlines.h"
#include "DFGInPlaceAbstractState.h"
#include "FTLAbstractHeapRepository.h"
#include "FTLForOSREntryJITCode.h"
#include "FTLFormattedValue.h"
#include "FTLInlineCacheSize.h"
#include "FTLLoweredNodeValue.h"
#include "FTLOutput.h"
#include "FTLThunks.h"
#include "LinkBuffer.h"
#include "OperandsInlines.h"
#include "Operations.h"
#include "VirtualRegister.h"
#include <wtf/ProcessID.h>
namespace JSC { namespace FTL {
using namespace DFG;
static int compileCounter;
// Using this instead of typeCheck() helps to reduce the load on LLVM, by creating
// significantly less dead code.
#define FTL_TYPE_CHECK(lowValue, highValue, typesPassedThrough, failCondition) do { \
FormattedValue _ftc_lowValue = (lowValue); \
Edge _ftc_highValue = (highValue); \
SpeculatedType _ftc_typesPassedThrough = (typesPassedThrough); \
if (!m_interpreter.needsTypeCheck(_ftc_highValue, _ftc_typesPassedThrough)) \
break; \
typeCheck(_ftc_lowValue, _ftc_highValue, _ftc_typesPassedThrough, (failCondition)); \
} while (false)
class LowerDFGToLLVM {
public:
LowerDFGToLLVM(State& state)
: m_graph(state.graph)
, m_ftlState(state)
, m_heaps(state.context)
, m_out(state.context)
, m_availability(OperandsLike, state.graph.block(0)->variablesAtHead)
, m_state(state.graph)
, m_interpreter(state.graph, m_state)
, m_stackmapIDs(0)
{
}
void lower()
{
CString name;
if (verboseCompilationEnabled()) {
name = toCString(
"jsBody_", atomicIncrement(&compileCounter), "_", codeBlock()->inferredName(),
"_", codeBlock()->hash());
} else
name = "jsBody";
m_graph.m_dominators.computeIfNecessary(m_graph);
m_ftlState.module =
llvm->ModuleCreateWithNameInContext(name.data(), m_ftlState.context);
m_ftlState.function = addFunction(
m_ftlState.module, name.data(), functionType(m_out.int64, m_out.intPtr));
setFunctionCallingConv(m_ftlState.function, LLVMCCallConv);
m_out.initialize(m_ftlState.module, m_ftlState.function, m_heaps);
m_prologue = appendBasicBlock(m_ftlState.context, m_ftlState.function);
m_out.appendTo(m_prologue);
createPhiVariables();
m_callFrame = m_out.param(0);
m_tagTypeNumber = m_out.constInt64(TagTypeNumber);
m_tagMask = m_out.constInt64(TagMask);
for (BlockIndex blockIndex = 0; blockIndex < m_graph.numBlocks(); ++blockIndex) {
m_highBlock = m_graph.block(blockIndex);
if (!m_highBlock)
continue;
m_blocks.add(m_highBlock, FTL_NEW_BLOCK(m_out, ("Block ", *m_highBlock)));
}
m_out.appendTo(m_prologue);
m_out.jump(lowBlock(m_graph.block(0)));
Vector<BasicBlock*> depthFirst;
m_graph.getBlocksInDepthFirstOrder(depthFirst);
for (unsigned i = 0; i < depthFirst.size(); ++i)
compileBlock(depthFirst[i]);
if (Options::dumpLLVMIR())
dumpModule(m_ftlState.module);
if (verboseCompilationEnabled())
m_ftlState.dumpState("after lowering");
if (validationEnabled())
verifyModule(m_ftlState.module);
}
private:
void createPhiVariables()
{
for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
BasicBlock* block = m_graph.block(blockIndex);
if (!block)
continue;
for (unsigned nodeIndex = block->size(); nodeIndex--;) {
Node* node = block->at(nodeIndex);
if (node->op() != Phi)
continue;
LType type;
switch (node->flags() & NodeResultMask) {
case NodeResultNumber:
type = m_out.doubleType;
break;
case NodeResultInt32:
type = m_out.int32;
break;
case NodeResultInt52:
type = m_out.int64;
break;
case NodeResultBoolean:
type = m_out.boolean;
break;
case NodeResultJS:
type = m_out.int64;
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
m_phis.add(node, buildAlloca(m_out.m_builder, type));
}
}
}
void compileBlock(BasicBlock* block)
{
if (!block)
return;
if (verboseCompilationEnabled())
dataLog("Compiling block ", *block, "\n");
m_highBlock = block;
LBasicBlock lowBlock = m_blocks.get(m_highBlock);
m_nextHighBlock = 0;
for (BlockIndex nextBlockIndex = m_highBlock->index + 1; nextBlockIndex < m_graph.numBlocks(); ++nextBlockIndex) {
m_nextHighBlock = m_graph.block(nextBlockIndex);
if (m_nextHighBlock)
break;
}
m_nextLowBlock = m_nextHighBlock ? m_blocks.get(m_nextHighBlock) : 0;
// All of this effort to find the next block gives us the ability to keep the
// generated IR in roughly program order. This ought not affect the performance
// of the generated code (since we expect LLVM to reorder things) but it will
// make IR dumps easier to read.
m_out.appendTo(lowBlock, m_nextLowBlock);
if (Options::ftlCrashes())
m_out.crashNonTerminal();
if (!m_highBlock->cfaHasVisited) {
m_out.crash();
return;
}
initializeOSRExitStateForBlock();
m_state.reset();
m_state.beginBasicBlock(m_highBlock);
for (m_nodeIndex = 0; m_nodeIndex < m_highBlock->size(); ++m_nodeIndex) {
if (!compileNode(m_nodeIndex))
break;
}
}
bool compileNode(unsigned nodeIndex)
{
if (!m_state.isValid()) {
m_out.unreachable();
return false;
}
m_node = m_highBlock->at(nodeIndex);
m_codeOriginForExitProfile = m_node->codeOrigin;
m_codeOriginForExitTarget = m_node->codeOriginForExitTarget;
if (verboseCompilationEnabled())
dataLog("Lowering ", m_node, "\n");
bool shouldExecuteEffects = m_interpreter.startExecuting(m_node);
switch (m_node->op()) {
case Upsilon:
compileUpsilon();
break;
case Phi:
compilePhi();
break;
case JSConstant:
break;
case WeakJSConstant:
compileWeakJSConstant();
break;
case GetArgument:
compileGetArgument();
break;
case ExtractOSREntryLocal:
compileExtractOSREntryLocal();
break;
case GetLocal:
compileGetLocal();
break;
case SetLocal:
compileSetLocal();
break;
case MovHint:
compileMovHint();
break;
case ZombieHint:
compileZombieHint();
break;
case Phantom:
compilePhantom();
break;
case ValueAdd:
compileValueAdd();
break;
case ArithAdd:
compileAddSub();
break;
case ArithSub:
compileAddSub();
break;
case ArithMul:
compileArithMul();
break;
case ArithDiv:
compileArithDivMod();
break;
case ArithMod:
compileArithDivMod();
break;
case ArithMin:
case ArithMax:
compileArithMinOrMax();
break;
case ArithAbs:
compileArithAbs();
break;
case ArithNegate:
compileArithNegate();
break;
case BitAnd:
compileBitAnd();
break;
case BitOr:
compileBitOr();
break;
case BitXor:
compileBitXor();
break;
case BitRShift:
compileBitRShift();
break;
case BitLShift:
compileBitLShift();
break;
case BitURShift:
compileBitURShift();
break;
case UInt32ToNumber:
compileUInt32ToNumber();
break;
case Int32ToDouble:
compileInt32ToDouble();
break;
case CheckStructure:
compileCheckStructure();
break;
case StructureTransitionWatchpoint:
compileStructureTransitionWatchpoint();
break;
case CheckFunction:
compileCheckFunction();
break;
case ArrayifyToStructure:
compileArrayifyToStructure();
break;
case PutStructure:
compilePutStructure();
break;
case PhantomPutStructure:
compilePhantomPutStructure();
break;
case GetById:
compileGetById();
break;
case PutById:
compilePutById();
break;
case GetButterfly:
compileGetButterfly();
break;
case ConstantStoragePointer:
compileConstantStoragePointer();
break;
case GetIndexedPropertyStorage:
compileGetIndexedPropertyStorage();
break;
case CheckArray:
compileCheckArray();
break;
case GetArrayLength:
compileGetArrayLength();
break;
case CheckInBounds:
compileCheckInBounds();
break;
case GetByVal:
compileGetByVal();
break;
case PutByVal:
case PutByValAlias:
case PutByValDirect:
compilePutByVal();
break;
case NewObject:
compileNewObject();
break;
case NewArray:
compileNewArray();
break;
case NewArrayBuffer:
compileNewArrayBuffer();
break;
case AllocatePropertyStorage:
compileAllocatePropertyStorage();
break;
case StringCharAt:
compileStringCharAt();
break;
case StringCharCodeAt:
compileStringCharCodeAt();
break;
case GetByOffset:
compileGetByOffset();
break;
case PutByOffset:
compilePutByOffset();
break;
case GetGlobalVar:
compileGetGlobalVar();
break;
case PutGlobalVar:
compilePutGlobalVar();
break;
case NotifyWrite:
compileNotifyWrite();
break;
case GetMyScope:
compileGetMyScope();
break;
case SkipScope:
compileSkipScope();
break;
case GetClosureRegisters:
compileGetClosureRegisters();
break;
case GetClosureVar:
compileGetClosureVar();
break;
case PutClosureVar:
compilePutClosureVar();
break;
case CompareEq:
compileCompareEq();
break;
case CompareEqConstant:
compileCompareEqConstant();
break;
case CompareStrictEq:
compileCompareStrictEq();
break;
case CompareStrictEqConstant:
compileCompareStrictEqConstant();
break;
case CompareLess:
compileCompareLess();
break;
case CompareLessEq:
compileCompareLessEq();
break;
case CompareGreater:
compileCompareGreater();
break;
case CompareGreaterEq:
compileCompareGreaterEq();
break;
case LogicalNot:
compileLogicalNot();
break;
case Call:
case Construct:
compileCallOrConstruct();
break;
case Jump:
compileJump();
break;
case Branch:
compileBranch();
break;
case Switch:
compileSwitch();
break;
case Return:
compileReturn();
break;
case ForceOSRExit:
compileForceOSRExit();
break;
case InvalidationPoint:
compileInvalidationPoint();
break;
case ValueToInt32:
compileValueToInt32();
break;
case Int52ToValue:
compileInt52ToValue();
break;
case StoreBarrier:
compileStoreBarrier();
break;
case ConditionalStoreBarrier:
compileConditionalStoreBarrier();
break;
case StoreBarrierWithNullCheck:
compileStoreBarrierWithNullCheck();
break;
case Flush:
case PhantomLocal:
case SetArgument:
case LoopHint:
case VariableWatchpoint:
case FunctionReentryWatchpoint:
case TypedArrayWatchpoint:
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
if (shouldExecuteEffects)
m_interpreter.executeEffects(nodeIndex);
return true;
}
void compileValueToInt32()
{
switch (m_node->child1().useKind()) {
case Int32Use:
setInt32(lowInt32(m_node->child1()));
break;
case MachineIntUse:
setInt32(m_out.castToInt32(lowStrictInt52(m_node->child1())));
break;
case NumberUse:
case NotCellUse: {
LoweredNodeValue value = m_int32Values.get(m_node->child1().node());
if (isValid(value)) {
setInt32(value.value());
break;
}
value = m_jsValueValues.get(m_node->child1().node());
if (isValid(value)) {
LBasicBlock intCase = FTL_NEW_BLOCK(m_out, ("ValueToInt32 int case"));
LBasicBlock notIntCase = FTL_NEW_BLOCK(m_out, ("ValueToInt32 not int case"));
LBasicBlock doubleCase = 0;
LBasicBlock notNumberCase = 0;
if (m_node->child1().useKind() == NotCellUse) {
doubleCase = FTL_NEW_BLOCK(m_out, ("ValueToInt32 double case"));
notNumberCase = FTL_NEW_BLOCK(m_out, ("ValueToInt32 not number case"));
}
LBasicBlock continuation = FTL_NEW_BLOCK(m_out, ("ValueToInt32 continuation"));
Vector<ValueFromBlock> results;
m_out.branch(isNotInt32(value.value()), notIntCase, intCase);
LBasicBlock lastNext = m_out.appendTo(intCase, notIntCase);
results.append(m_out.anchor(unboxInt32(value.value())));
m_out.jump(continuation);
if (m_node->child1().useKind() == NumberUse) {
m_out.appendTo(notIntCase, continuation);
FTL_TYPE_CHECK(
jsValueValue(value.value()), m_node->child1(), SpecFullNumber,
isCellOrMisc(value.value()));
results.append(m_out.anchor(doubleToInt32(unboxDouble(value.value()))));
m_out.jump(continuation);
} else {
m_out.appendTo(notIntCase, doubleCase);
m_out.branch(isCellOrMisc(value.value()), notNumberCase, doubleCase);
m_out.appendTo(doubleCase, notNumberCase);
results.append(m_out.anchor(doubleToInt32(unboxDouble(value.value()))));
m_out.jump(continuation);
m_out.appendTo(notNumberCase, continuation);
FTL_TYPE_CHECK(
jsValueValue(value.value()), m_node->child1(), ~SpecCell,
isCell(value.value()));
LValue specialResult = m_out.select(
m_out.equal(
value.value(),
m_out.constInt64(JSValue::encode(jsBoolean(true)))),
m_out.int32One, m_out.int32Zero);
results.append(m_out.anchor(specialResult));
m_out.jump(continuation);
}
m_out.appendTo(continuation, lastNext);
setInt32(m_out.phi(m_out.int32, results));
break;
}
value = m_doubleValues.get(m_node->child1().node());
if (isValid(value)) {
setInt32(doubleToInt32(value.value()));
break;
}
terminate(Uncountable);
break;
}
case BooleanUse:
setInt32(m_out.zeroExt(lowBoolean(m_node->child1()), m_out.int32));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void compileInt52ToValue()
{
setJSValue(lowJSValue(m_node->child1()));
}
void compileStoreBarrier()
{
emitStoreBarrier(lowCell(m_node->child1()));
}
void compileConditionalStoreBarrier()
{
LValue base = lowCell(m_node->child1());
LValue value = lowJSValue(m_node->child2());
emitStoreBarrier(base, value, m_node->child2());
}
void compileStoreBarrierWithNullCheck()
{
#if ENABLE(GGC)
LBasicBlock isNotNull = FTL_NEW_BLOCK(m_out, ("Store barrier with null check value not null"));
LBasicBlock continuation = FTL_NEW_BLOCK(m_out, ("Store barrier continuation"));
LValue base = lowJSValue(m_node->child1());
m_out.branch(m_out.isZero64(base), continuation, isNotNull);
LBasicBlock lastNext = m_out.appendTo(isNotNull, continuation);
emitStoreBarrier(base);
m_out.appendTo(continuation, lastNext);
#else
speculate(m_node->child1());
#endif
}
void compileUpsilon()
{
LValue destination = m_phis.get(m_node->phi());
switch (m_node->child1().useKind()) {
case NumberUse:
m_out.set(lowDouble(m_node->child1()), destination);
break;
case Int32Use:
m_out.set(lowInt32(m_node->child1()), destination);
break;
case MachineIntUse:
m_out.set(lowInt52(m_node->child1()), destination);
break;
case BooleanUse:
m_out.set(lowBoolean(m_node->child1()), destination);
break;
case CellUse:
m_out.set(lowCell(m_node->child1()), destination);
break;
case UntypedUse:
m_out.set(lowJSValue(m_node->child1()), destination);
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void compilePhi()
{
LValue source = m_phis.get(m_node);
switch (m_node->flags() & NodeResultMask) {
case NodeResultNumber:
setDouble(m_out.get(source));
break;
case NodeResultInt32:
setInt32(m_out.get(source));
break;
case NodeResultInt52:
setInt52(m_out.get(source));
break;
case NodeResultBoolean:
setBoolean(m_out.get(source));
break;
case NodeResultJS:
setJSValue(m_out.get(source));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void compileWeakJSConstant()
{
setJSValue(weakPointer(m_node->weakConstant()));
}
void compileGetArgument()
{
VariableAccessData* variable = m_node->variableAccessData();
VirtualRegister operand = variable->machineLocal();
RELEASE_ASSERT(operand.isArgument());
LValue jsValue = m_out.load64(addressFor(operand));
switch (useKindFor(variable->flushFormat())) {
case Int32Use:
speculate(BadType, jsValueValue(jsValue), m_node, isNotInt32(jsValue));
setInt32(unboxInt32(jsValue));
break;
case CellUse:
speculate(BadType, jsValueValue(jsValue), m_node, isNotCell(jsValue));
setJSValue(jsValue);
break;
case BooleanUse:
speculate(BadType, jsValueValue(jsValue), m_node, isNotBoolean(jsValue));
setBoolean(unboxBoolean(jsValue));
break;
case UntypedUse:
setJSValue(jsValue);
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void compileExtractOSREntryLocal()
{
EncodedJSValue* buffer = static_cast<EncodedJSValue*>(
m_ftlState.jitCode->ftlForOSREntry()->entryBuffer()->dataBuffer());
setJSValue(m_out.load64(m_out.absolute(buffer + m_node->unlinkedLocal().toLocal())));
}
void compileGetLocal()
{
// GetLocals arise only for captured variables.
VariableAccessData* variable = m_node->variableAccessData();
AbstractValue& value = m_state.variables().operand(variable->local());
RELEASE_ASSERT(variable->isCaptured());
if (isInt32Speculation(value.m_type))
setInt32(m_out.load32(payloadFor(variable->machineLocal())));
else
setJSValue(m_out.load64(addressFor(variable->machineLocal())));
}
void compileSetLocal()
{
VariableAccessData* variable = m_node->variableAccessData();
switch (variable->flushFormat()) {
case FlushedJSValue: {
LValue value = lowJSValue(m_node->child1());
m_out.store64(value, addressFor(variable->machineLocal()));
break;
}
case FlushedDouble: {
LValue value = lowDouble(m_node->child1());
m_out.storeDouble(value, addressFor(variable->machineLocal()));
break;
}
case FlushedInt32: {
LValue value = lowInt32(m_node->child1());
m_out.store32(value, payloadFor(variable->machineLocal()));
break;
}
case FlushedInt52: {
LValue value = lowInt52(m_node->child1());
m_out.store64(value, addressFor(variable->machineLocal()));
break;
}
case FlushedCell: {
LValue value = lowCell(m_node->child1());
m_out.store64(value, addressFor(variable->machineLocal()));
break;
}
case FlushedBoolean: {
speculateBoolean(m_node->child1());
m_out.store64(
lowJSValue(m_node->child1(), ManualOperandSpeculation),
addressFor(variable->machineLocal()));
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
m_availability.operand(variable->local()) = Availability(variable->flushedAt());
}
void compileMovHint()
{
ASSERT(m_node->containsMovHint());
ASSERT(m_node->op() != ZombieHint);
VirtualRegister operand = m_node->unlinkedLocal();
m_availability.operand(operand) = Availability(m_node->child1().node());
}
void compileZombieHint()
{
m_availability.operand(m_node->unlinkedLocal()) = Availability::unavailable();
}
void compilePhantom()
{
DFG_NODE_DO_TO_CHILDREN(m_graph, m_node, speculate);
}
void compileValueAdd()
{
J_JITOperation_EJJ operation;
if (!(m_state.forNode(m_node->child1()).m_type & SpecFullNumber)
&& !(m_state.forNode(m_node->child2()).m_type & SpecFullNumber))
operation = operationValueAddNotNumber;
else
operation = operationValueAdd;
setJSValue(vmCall(
m_out.operation(operation), m_callFrame,
lowJSValue(m_node->child1()), lowJSValue(m_node->child2())));
}
void compileAddSub()
{
bool isSub = m_node->op() == ArithSub;
switch (m_node->binaryUseKind()) {
case Int32Use: {
LValue left = lowInt32(m_node->child1());
LValue right = lowInt32(m_node->child2());
LValue result = isSub ? m_out.sub(left, right) : m_out.add(left, right);
if (bytecodeCanTruncateInteger(m_node->arithNodeFlags())) {
setInt32(result);
break;
}
LValue overflow = isSub ? m_out.subWithOverflow32(left, right) : m_out.addWithOverflow32(left, right);
speculate(Overflow, noValue(), 0, m_out.extractValue(overflow, 1));
setInt32(result);
break;
}
case MachineIntUse: {
if (!m_state.forNode(m_node->child1()).couldBeType(SpecInt52)
&& !m_state.forNode(m_node->child2()).couldBeType(SpecInt52)) {
Int52Kind kind;
LValue left = lowWhicheverInt52(m_node->child1(), kind);
LValue right = lowInt52(m_node->child2(), kind);
setInt52(isSub ? m_out.sub(left, right) : m_out.add(left, right), kind);
break;
}
LValue left = lowInt52(m_node->child1());
LValue right = lowInt52(m_node->child2());
LValue result = isSub ? m_out.sub(left, right) : m_out.add(left, right);
LValue overflow = isSub ? m_out.subWithOverflow64(left, right) : m_out.addWithOverflow64(left, right);
speculate(Int52Overflow, noValue(), 0, m_out.extractValue(overflow, 1));
setInt52(result);
break;
}
case NumberUse: {
LValue C1 = lowDouble(m_node->child1());
LValue C2 = lowDouble(m_node->child2());
setDouble(isSub ? m_out.doubleSub(C1, C2) : m_out.doubleAdd(C1, C2));
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void compileArithMul()
{
switch (m_node->binaryUseKind()) {
case Int32Use: {
LValue left = lowInt32(m_node->child1());
LValue right = lowInt32(m_node->child2());
LValue result = m_out.mul(left, right);
if (!bytecodeCanTruncateInteger(m_node->arithNodeFlags())) {
LValue overflowResult = m_out.mulWithOverflow32(left, right);
speculate(Overflow, noValue(), 0, m_out.extractValue(overflowResult, 1));
}
if (!bytecodeCanIgnoreNegativeZero(m_node->arithNodeFlags())) {
LBasicBlock slowCase = FTL_NEW_BLOCK(m_out, ("ArithMul slow case"));
LBasicBlock continuation = FTL_NEW_BLOCK(m_out, ("ArithMul continuation"));
m_out.branch(m_out.notZero32(result), continuation, slowCase);
LBasicBlock lastNext = m_out.appendTo(slowCase, continuation);
LValue cond = m_out.bitOr(m_out.lessThan(left, m_out.int32Zero), m_out.lessThan(right, m_out.int32Zero));
speculate(NegativeZero, noValue(), 0, cond);
m_out.jump(continuation);
m_out.appendTo(continuation, lastNext);
}
setInt32(result);
break;
}
case MachineIntUse: {
Int52Kind kind;
LValue left = lowWhicheverInt52(m_node->child1(), kind);
LValue right = lowInt52(m_node->child2(), opposite(kind));
LValue result = m_out.mul(left, right);
LValue overflowResult = m_out.mulWithOverflow64(left, right);
speculate(Int52Overflow, noValue(), 0, m_out.extractValue(overflowResult, 1));
if (!bytecodeCanIgnoreNegativeZero(m_node->arithNodeFlags())) {
LBasicBlock slowCase = FTL_NEW_BLOCK(m_out, ("ArithMul slow case"));
LBasicBlock continuation = FTL_NEW_BLOCK(m_out, ("ArithMul continuation"));
m_out.branch(m_out.notZero64(result), continuation, slowCase);
LBasicBlock lastNext = m_out.appendTo(slowCase, continuation);
LValue cond = m_out.bitOr(m_out.lessThan(left, m_out.int64Zero), m_out.lessThan(right, m_out.int64Zero));
speculate(NegativeZero, noValue(), 0, cond);
m_out.jump(continuation);
m_out.appendTo(continuation, lastNext);
}
setInt52(result);
break;
}
case NumberUse: {
setDouble(
m_out.doubleMul(lowDouble(m_node->child1()), lowDouble(m_node->child2())));
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void compileArithDivMod()
{
switch (m_node->binaryUseKind()) {
case Int32Use: {
LValue numerator = lowInt32(m_node->child1());
LValue denominator = lowInt32(m_node->child2());
LBasicBlock unsafeDenominator = FTL_NEW_BLOCK(m_out, ("ArithDivMod unsafe denominator"));
LBasicBlock continuation = FTL_NEW_BLOCK(m_out, ("ArithDivMod continuation"));
LBasicBlock done = FTL_NEW_BLOCK(m_out, ("ArithDivMod done"));
Vector<ValueFromBlock, 3> results;
LValue adjustedDenominator = m_out.add(denominator, m_out.int32One);
m_out.branch(m_out.above(adjustedDenominator, m_out.int32One), continuation, unsafeDenominator);
LBasicBlock lastNext = m_out.appendTo(unsafeDenominator, continuation);
LValue neg2ToThe31 = m_out.constInt32(-2147483647-1);
if (bytecodeUsesAsNumber(m_node->arithNodeFlags())) {
LValue cond = m_out.bitOr(m_out.isZero32(denominator), m_out.equal(numerator, neg2ToThe31));
speculate(Overflow, noValue(), 0, cond);
m_out.jump(continuation);
} else {
// This is the case where we convert the result to an int after we're done. So,
// if the denominator is zero, then the result should be zero.
// If the denominator is not zero (i.e. it's -1 because we're guarded by the
// check above) and the numerator is -2^31 then the result should be -2^31.
LBasicBlock divByZero = FTL_NEW_BLOCK(m_out, ("ArithDiv divide by zero"));
LBasicBlock notDivByZero = FTL_NEW_BLOCK(m_out, ("ArithDiv not divide by zero"));
LBasicBlock neg2ToThe31ByNeg1 = FTL_NEW_BLOCK(m_out, ("ArithDiv -2^31/-1"));
m_out.branch(m_out.isZero32(denominator), divByZero, notDivByZero);
m_out.appendTo(divByZero, notDivByZero);
results.append(m_out.anchor(m_out.int32Zero));
m_out.jump(done);
m_out.appendTo(notDivByZero, neg2ToThe31ByNeg1);
m_out.branch(m_out.equal(numerator, neg2ToThe31), neg2ToThe31ByNeg1, continuation);
m_out.appendTo(neg2ToThe31ByNeg1, continuation);
results.append(m_out.anchor(neg2ToThe31));
m_out.jump(done);
}
m_out.appendTo(continuation, done);
if (!bytecodeCanIgnoreNegativeZero(m_node->arithNodeFlags())) {
LBasicBlock zeroNumerator = FTL_NEW_BLOCK(m_out, ("ArithDivMod zero numerator"));
LBasicBlock numeratorContinuation = FTL_NEW_BLOCK(m_out, ("ArithDivMod numerator continuation"));
m_out.branch(m_out.isZero32(numerator), zeroNumerator, numeratorContinuation);
LBasicBlock innerLastNext = m_out.appendTo(zeroNumerator, numeratorContinuation);