/// EmitStoreOfComplex - Store the specified real/imag parts into the
/// specified value pointer.
void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, LValue lvalue,
bool isInit) {
if (lvalue.getType()->isAtomicType() ||
(!isInit && CGF.LValueIsSuitableForInlineAtomic(lvalue)))
return CGF.EmitAtomicStore(RValue::getComplex(Val), lvalue, isInit);
Address Ptr = lvalue.getAddress();
Address RealPtr = CGF.emitAddrOfRealComponent(Ptr, lvalue.getType());
Address ImagPtr = CGF.emitAddrOfImagComponent(Ptr, lvalue.getType());
Builder.CreateStore(Val.first, RealPtr, lvalue.isVolatileQualified());
Builder.CreateStore(Val.second, ImagPtr, lvalue.isVolatileQualified());
}
/// EmitStoreOfComplex - Store the specified real/imag parts into the
/// specified value pointer.
void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val,
LValue lvalue,
bool isInit) {
if (lvalue.getType()->isAtomicType())
return CGF.EmitAtomicStore(RValue::getComplex(Val), lvalue, isInit);
llvm::Value *Ptr = lvalue.getAddress();
llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
// TODO: alignment
Builder.CreateStore(Val.first, RealPtr, lvalue.isVolatileQualified());
Builder.CreateStore(Val.second, ImagPtr, lvalue.isVolatileQualified());
}
ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
ComplexPairTy Val;
LValue LV = EmitBinAssignLValue(E, Val);
// The result of an assignment in C is the assigned r-value.
if (!CGF.getContext().getLangOptions().CPlusPlus)
return Val;
// If the lvalue is non-volatile, return the computed value of the assignment.
if (!LV.isVolatileQualified())
return Val;
return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
}
void AggExprEmitter::VisitBinAssign(const BinaryOperator *E) {
// For an assignment to work, the value on the right has
// to be compatible with the value on the left.
assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
E->getRHS()->getType())
&& "Invalid assignment");
LValue LHS = CGF.EmitLValue(E->getLHS());
// We have to special case property setters, otherwise we must have
// a simple lvalue (no aggregates inside vectors, bitfields).
if (LHS.isPropertyRef()) {
llvm::Value *AggLoc = DestPtr;
if (!AggLoc)
AggLoc = CGF.CreateMemTemp(E->getRHS()->getType());
CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest);
CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(),
RValue::getAggregate(AggLoc, VolatileDest));
} else if (LHS.isKVCRef()) {
llvm::Value *AggLoc = DestPtr;
if (!AggLoc)
AggLoc = CGF.CreateMemTemp(E->getRHS()->getType());
CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest);
CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(),
RValue::getAggregate(AggLoc, VolatileDest));
} else {
bool RequiresGCollection = false;
if (CGF.getContext().getLangOptions().getGCMode())
RequiresGCollection = TypeRequiresGCollection(E->getLHS()->getType());
// Codegen the RHS so that it stores directly into the LHS.
CGF.EmitAggExpr(E->getRHS(), LHS.getAddress(), LHS.isVolatileQualified(),
false, false, RequiresGCollection);
EmitFinalDestCopy(E, LHS, true);
}
}
/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired.
void AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) {
assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc");
EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(),
Src.isVolatileQualified()),
Ignore);
}
/// Copy an r-value into memory as part of storing to an atomic type.
/// This needs to create a bit-pattern suitable for atomic operations.
void AtomicInfo::emitCopyIntoMemory(RValue rvalue, LValue dest) const {
// If we have an r-value, the rvalue should be of the atomic type,
// which means that the caller is responsible for having zeroed
// any padding. Just do an aggregate copy of that type.
if (rvalue.isAggregate()) {
CGF.EmitAggregateCopy(dest.getAddress(),
rvalue.getAggregateAddr(),
getAtomicType(),
(rvalue.isVolatileQualified()
|| dest.isVolatileQualified()),
dest.getAlignment());
return;
}
// Okay, otherwise we're copying stuff.
// Zero out the buffer if necessary.
emitMemSetZeroIfNecessary(dest);
// Drill past the padding if present.
dest = projectValue(dest);
// Okay, store the rvalue in.
if (rvalue.isScalar()) {
CGF.EmitStoreOfScalar(rvalue.getScalarVal(), dest, /*init*/ true);
} else {
CGF.EmitStoreOfComplex(rvalue.getComplexVal(), dest, /*init*/ true);
}
}
LValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) {
assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!");
llvm::Value *Temp = CreateMemTemp(E->getType());
LValue LV = MakeAddrLValue(Temp, E->getType());
EmitAggExpr(E, Temp, LV.isVolatileQualified());
return LV;
}
/// EmitLoadOfLValue - Given an RValue reference for a complex, emit code to
/// load the real and imaginary pieces, returning them as Real/Imag.
ComplexPairTy ComplexExprEmitter::EmitLoadOfLValue(LValue lvalue,
SourceLocation loc) {
assert(lvalue.isSimple() && "non-simple complex l-value?");
if (lvalue.getType()->isAtomicType())
return CGF.EmitAtomicLoad(lvalue, loc).getComplexVal();
llvm::Value *SrcPtr = lvalue.getAddress();
bool isVolatile = lvalue.isVolatileQualified();
unsigned AlignR = lvalue.getAlignment().getQuantity();
ASTContext &C = CGF.getContext();
QualType ComplexTy = lvalue.getType();
unsigned ComplexAlign = C.getTypeAlignInChars(ComplexTy).getQuantity();
unsigned AlignI = std::min(AlignR, ComplexAlign);
llvm::Value *Real=nullptr, *Imag=nullptr;
if (!IgnoreReal || isVolatile) {
llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
SrcPtr->getName() + ".realp");
Real = Builder.CreateAlignedLoad(RealP, AlignR, isVolatile,
SrcPtr->getName() + ".real");
}
if (!IgnoreImag || isVolatile) {
llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
SrcPtr->getName() + ".imagp");
Imag = Builder.CreateAlignedLoad(ImagP, AlignI, isVolatile,
SrcPtr->getName() + ".imag");
}
return ComplexPairTy(Real, Imag);
}
/// EmitStoreOfComplex - Store the specified real/imag parts into the
/// specified value pointer.
void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, LValue lvalue,
bool isInit) {
if (lvalue.getType()->isAtomicType())
return CGF.EmitAtomicStore(RValue::getComplex(Val), lvalue, isInit);
llvm::Value *Ptr = lvalue.getAddress();
llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
unsigned AlignR = lvalue.getAlignment().getQuantity();
ASTContext &C = CGF.getContext();
QualType ComplexTy = lvalue.getType();
unsigned ComplexAlign = C.getTypeAlignInChars(ComplexTy).getQuantity();
unsigned AlignI = std::min(AlignR, ComplexAlign);
Builder.CreateAlignedStore(Val.first, RealPtr, AlignR,
lvalue.isVolatileQualified());
Builder.CreateAlignedStore(Val.second, ImagPtr, AlignI,
lvalue.isVolatileQualified());
}
// Compound assignments.
ComplexPairTy ComplexExprEmitter::
EmitCompoundAssign(const CompoundAssignOperator *E,
ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)) {
ComplexPairTy Val;
LValue LV = EmitCompoundAssignLValue(E, Func, Val);
// The result of an assignment in C is the assigned r-value.
if (!CGF.getContext().getLangOptions().CPlusPlus)
return Val;
// Objective-C property assignment never reloads the value following a store.
if (LV.isPropertyRef())
return Val;
// If the lvalue is non-volatile, return the computed value of the assignment.
if (!LV.isVolatileQualified())
return Val;
return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
}
/// Emit a store to an l-value of atomic type.
///
/// Note that the r-value is expected to be an r-value *of the atomic
/// type*; this means that for aggregate r-values, it should include
/// storage for any padding that was necessary.
void CodeGenFunction::EmitAtomicStore(RValue rvalue, LValue dest, bool isInit) {
// If this is an aggregate r-value, it should agree in type except
// maybe for address-space qualification.
assert(!rvalue.isAggregate() ||
rvalue.getAggregateAddr()->getType()->getPointerElementType()
== dest.getAddress()->getType()->getPointerElementType());
AtomicInfo atomics(*this, dest);
// If this is an initialization, just put the value there normally.
if (isInit) {
atomics.emitCopyIntoMemory(rvalue, dest);
return;
}
// Check whether we should use a library call.
if (atomics.shouldUseLibcall()) {
// Produce a source address.
llvm::Value *srcAddr = atomics.materializeRValue(rvalue);
// void __atomic_store(size_t size, void *mem, void *val, int order)
CallArgList args;
args.add(RValue::get(atomics.getAtomicSizeValue()),
getContext().getSizeType());
args.add(RValue::get(EmitCastToVoidPtr(dest.getAddress())),
getContext().VoidPtrTy);
args.add(RValue::get(EmitCastToVoidPtr(srcAddr)),
getContext().VoidPtrTy);
args.add(RValue::get(llvm::ConstantInt::get(
IntTy, AtomicExpr::AO_ABI_memory_order_seq_cst)),
getContext().IntTy);
emitAtomicLibcall(*this, "__atomic_store", getContext().VoidTy, args);
return;
}
// Okay, we're doing this natively.
llvm::Value *intValue = atomics.convertRValueToInt(rvalue);
// Do the atomic store.
llvm::Value *addr = atomics.emitCastToAtomicIntPointer(dest.getAddress());
llvm::StoreInst *store = Builder.CreateStore(intValue, addr);
// Initializations don't need to be atomic.
if (!isInit) store->setAtomic(llvm::SequentiallyConsistent);
// Other decoration.
store->setAlignment(dest.getAlignment().getQuantity());
if (dest.isVolatileQualified())
store->setVolatile(true);
if (dest.getTBAAInfo())
CGM.DecorateInstruction(store, dest.getTBAAInfo());
}
/// Emit a load from an l-value of atomic type. Note that the r-value
/// we produce is an r-value of the atomic *value* type.
RValue CodeGenFunction::EmitAtomicLoad(LValue src, SourceLocation loc,
AggValueSlot resultSlot) {
AtomicInfo atomics(*this, src);
// Check whether we should use a library call.
if (atomics.shouldUseLibcall()) {
llvm::Value *tempAddr;
if (!resultSlot.isIgnored()) {
assert(atomics.getEvaluationKind() == TEK_Aggregate);
tempAddr = resultSlot.getAddr();
} else {
tempAddr = CreateMemTemp(atomics.getAtomicType(), "atomic-load-temp");
}
// void __atomic_load(size_t size, void *mem, void *return, int order);
CallArgList args;
args.add(RValue::get(atomics.getAtomicSizeValue()),
getContext().getSizeType());
args.add(RValue::get(EmitCastToVoidPtr(src.getAddress())),
getContext().VoidPtrTy);
args.add(RValue::get(EmitCastToVoidPtr(tempAddr)),
getContext().VoidPtrTy);
args.add(RValue::get(llvm::ConstantInt::get(
IntTy, AtomicExpr::AO_ABI_memory_order_seq_cst)),
getContext().IntTy);
emitAtomicLibcall(*this, "__atomic_load", getContext().VoidTy, args);
// Produce the r-value.
return atomics.convertTempToRValue(tempAddr, resultSlot, loc);
}
// Okay, we're doing this natively.
llvm::Value *addr = atomics.emitCastToAtomicIntPointer(src.getAddress());
llvm::LoadInst *load = Builder.CreateLoad(addr, "atomic-load");
load->setAtomic(llvm::SequentiallyConsistent);
// Other decoration.
load->setAlignment(src.getAlignment().getQuantity());
if (src.isVolatileQualified())
load->setVolatile(true);
if (src.getTBAAInfo())
CGM.DecorateInstruction(load, src.getTBAAInfo());
// If we're ignoring an aggregate return, don't do anything.
if (atomics.getEvaluationKind() == TEK_Aggregate && resultSlot.isIgnored())
return RValue::getAggregate(nullptr, false);
// Okay, turn that back into the original value type.
return atomics.convertIntToValue(load, resultSlot, loc);
}
// Compound assignments.
ComplexPairTy ComplexExprEmitter::
EmitCompoundAssign(const CompoundAssignOperator *E,
ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
ComplexPairTy Val;
LValue LV = EmitCompoundAssignLValue(E, Func, Val);
// The result of an assignment in C is the assigned r-value.
if (!CGF.getLangOpts().CPlusPlus)
return Val;
// If the lvalue is non-volatile, return the computed value of the assignment.
if (!LV.isVolatileQualified())
return Val;
return EmitLoadOfLValue(LV);
}
/// EmitLoadOfLValue - Given an RValue reference for a complex, emit code to
/// load the real and imaginary pieces, returning them as Real/Imag.
ComplexPairTy ComplexExprEmitter::EmitLoadOfLValue(LValue lvalue,
SourceLocation loc) {
assert(lvalue.isSimple() && "non-simple complex l-value?");
if (lvalue.getType()->isAtomicType())
return CGF.EmitAtomicLoad(lvalue, loc).getComplexVal();
Address SrcPtr = lvalue.getAddress();
bool isVolatile = lvalue.isVolatileQualified();
llvm::Value *Real = nullptr, *Imag = nullptr;
if (!IgnoreReal || isVolatile) {
Address RealP = CGF.emitAddrOfRealComponent(SrcPtr, lvalue.getType());
Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr.getName() + ".real");
}
if (!IgnoreImag || isVolatile) {
Address ImagP = CGF.emitAddrOfImagComponent(SrcPtr, lvalue.getType());
Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr.getName() + ".imag");
}
return ComplexPairTy(Real, Imag);
}
/// EmitLoadOfLValue - Given an RValue reference for a complex, emit code to
/// load the real and imaginary pieces, returning them as Real/Imag.
ComplexPairTy ComplexExprEmitter::EmitLoadOfLValue(LValue lvalue) {
assert(lvalue.isSimple() && "non-simple complex l-value?");
if (lvalue.getType()->isAtomicType())
return CGF.EmitAtomicLoad(lvalue).getComplexVal();
llvm::Value *SrcPtr = lvalue.getAddress();
bool isVolatile = lvalue.isVolatileQualified();
llvm::Value *Real=0, *Imag=0;
if (!IgnoreReal || isVolatile) {
llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
SrcPtr->getName() + ".realp");
Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
}
if (!IgnoreImag || isVolatile) {
llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
SrcPtr->getName() + ".imagp");
Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
}
return ComplexPairTy(Real, Imag);
}
/// Emit a compare-and-exchange op for atomic type.
///
std::pair<RValue, RValue> CodeGenFunction::EmitAtomicCompareExchange(
LValue Obj, RValue Expected, RValue Desired, SourceLocation Loc,
llvm::AtomicOrdering Success, llvm::AtomicOrdering Failure, bool IsWeak,
AggValueSlot Slot) {
// If this is an aggregate r-value, it should agree in type except
// maybe for address-space qualification.
assert(!Expected.isAggregate() ||
Expected.getAggregateAddr()->getType()->getPointerElementType() ==
Obj.getAddress()->getType()->getPointerElementType());
assert(!Desired.isAggregate() ||
Desired.getAggregateAddr()->getType()->getPointerElementType() ==
Obj.getAddress()->getType()->getPointerElementType());
AtomicInfo Atomics(*this, Obj);
if (Failure >= Success)
// Don't assert on undefined behavior.
Failure = llvm::AtomicCmpXchgInst::getStrongestFailureOrdering(Success);
auto Alignment = Atomics.getValueAlignment();
// Check whether we should use a library call.
if (Atomics.shouldUseLibcall()) {
auto *ExpectedAddr = Atomics.materializeRValue(Expected);
// Produce a source address.
auto *DesiredAddr = Atomics.materializeRValue(Desired);
// bool __atomic_compare_exchange(size_t size, void *obj, void *expected,
// void *desired, int success, int failure);
CallArgList Args;
Args.add(RValue::get(Atomics.getAtomicSizeValue()),
getContext().getSizeType());
Args.add(RValue::get(EmitCastToVoidPtr(Obj.getAddress())),
getContext().VoidPtrTy);
Args.add(RValue::get(EmitCastToVoidPtr(ExpectedAddr)),
getContext().VoidPtrTy);
Args.add(RValue::get(EmitCastToVoidPtr(DesiredAddr)),
getContext().VoidPtrTy);
Args.add(RValue::get(llvm::ConstantInt::get(IntTy, Success)),
getContext().IntTy);
Args.add(RValue::get(llvm::ConstantInt::get(IntTy, Failure)),
getContext().IntTy);
auto SuccessFailureRVal = emitAtomicLibcall(
*this, "__atomic_compare_exchange", getContext().BoolTy, Args);
auto *PreviousVal =
Builder.CreateAlignedLoad(ExpectedAddr, Alignment.getQuantity());
return std::make_pair(RValue::get(PreviousVal), SuccessFailureRVal);
}
// If we've got a scalar value of the right size, try to avoid going
// through memory.
auto *ExpectedIntVal = Atomics.convertRValueToInt(Expected);
auto *DesiredIntVal = Atomics.convertRValueToInt(Desired);
// Do the atomic store.
auto *Addr = Atomics.emitCastToAtomicIntPointer(Obj.getAddress());
auto *Inst = Builder.CreateAtomicCmpXchg(Addr, ExpectedIntVal, DesiredIntVal,
Success, Failure);
// Other decoration.
Inst->setVolatile(Obj.isVolatileQualified());
Inst->setWeak(IsWeak);
// Okay, turn that back into the original value type.
auto *PreviousVal = Builder.CreateExtractValue(Inst, /*Idxs=*/0);
auto *SuccessFailureVal = Builder.CreateExtractValue(Inst, /*Idxs=*/1);
return std::make_pair(Atomics.convertIntToValue(PreviousVal, Slot, Loc),
RValue::get(SuccessFailureVal));
}
/// Emit a store to an l-value of atomic type.
///
/// Note that the r-value is expected to be an r-value *of the atomic
/// type*; this means that for aggregate r-values, it should include
/// storage for any padding that was necessary.
void CodeGenFunction::EmitAtomicStore(RValue rvalue, LValue dest, bool isInit) {
// If this is an aggregate r-value, it should agree in type except
// maybe for address-space qualification.
assert(!rvalue.isAggregate() ||
rvalue.getAggregateAddr()->getType()->getPointerElementType()
== dest.getAddress()->getType()->getPointerElementType());
AtomicInfo atomics(*this, dest);
// If this is an initialization, just put the value there normally.
if (isInit) {
atomics.emitCopyIntoMemory(rvalue, dest);
return;
}
// Check whether we should use a library call.
if (atomics.shouldUseLibcall()) {
// Produce a source address.
llvm::Value *srcAddr = atomics.materializeRValue(rvalue);
// void __atomic_store(size_t size, void *mem, void *val, int order)
CallArgList args;
args.add(RValue::get(atomics.getAtomicSizeValue()),
getContext().getSizeType());
args.add(RValue::get(EmitCastToVoidPtr(dest.getAddress())),
getContext().VoidPtrTy);
args.add(RValue::get(EmitCastToVoidPtr(srcAddr)),
getContext().VoidPtrTy);
args.add(RValue::get(llvm::ConstantInt::get(
IntTy, AtomicExpr::AO_ABI_memory_order_seq_cst)),
getContext().IntTy);
emitAtomicLibcall(*this, "__atomic_store", getContext().VoidTy, args);
return;
}
// Okay, we're doing this natively.
llvm::Value *intValue;
// If we've got a scalar value of the right size, try to avoid going
// through memory.
if (rvalue.isScalar() && !atomics.hasPadding()) {
llvm::Value *value = rvalue.getScalarVal();
if (isa<llvm::IntegerType>(value->getType())) {
intValue = value;
} else {
llvm::IntegerType *inputIntTy =
llvm::IntegerType::get(getLLVMContext(), atomics.getValueSizeInBits());
if (isa<llvm::PointerType>(value->getType())) {
intValue = Builder.CreatePtrToInt(value, inputIntTy);
} else {
intValue = Builder.CreateBitCast(value, inputIntTy);
}
}
// Otherwise, we need to go through memory.
} else {
// Put the r-value in memory.
llvm::Value *addr = atomics.materializeRValue(rvalue);
// Cast the temporary to the atomic int type and pull a value out.
addr = atomics.emitCastToAtomicIntPointer(addr);
intValue = Builder.CreateAlignedLoad(addr,
atomics.getAtomicAlignment().getQuantity());
}
// Do the atomic store.
llvm::Value *addr = atomics.emitCastToAtomicIntPointer(dest.getAddress());
llvm::StoreInst *store = Builder.CreateStore(intValue, addr);
// Initializations don't need to be atomic.
if (!isInit) store->setAtomic(llvm::SequentiallyConsistent);
// Other decoration.
store->setAlignment(dest.getAlignment().getQuantity());
if (dest.isVolatileQualified())
store->setVolatile(true);
if (dest.getTBAAInfo())
CGM.DecorateInstruction(store, dest.getTBAAInfo());
}
/// Emit a load from an l-value of atomic type. Note that the r-value
/// we produce is an r-value of the atomic *value* type.
RValue CodeGenFunction::EmitAtomicLoad(LValue src, SourceLocation loc,
AggValueSlot resultSlot) {
AtomicInfo atomics(*this, src);
// Check whether we should use a library call.
if (atomics.shouldUseLibcall()) {
llvm::Value *tempAddr;
if (!resultSlot.isIgnored()) {
assert(atomics.getEvaluationKind() == TEK_Aggregate);
tempAddr = resultSlot.getAddr();
} else {
tempAddr = CreateMemTemp(atomics.getAtomicType(), "atomic-load-temp");
}
// void __atomic_load(size_t size, void *mem, void *return, int order);
CallArgList args;
args.add(RValue::get(atomics.getAtomicSizeValue()),
getContext().getSizeType());
args.add(RValue::get(EmitCastToVoidPtr(src.getAddress())),
getContext().VoidPtrTy);
args.add(RValue::get(EmitCastToVoidPtr(tempAddr)),
getContext().VoidPtrTy);
args.add(RValue::get(llvm::ConstantInt::get(
IntTy, AtomicExpr::AO_ABI_memory_order_seq_cst)),
getContext().IntTy);
emitAtomicLibcall(*this, "__atomic_load", getContext().VoidTy, args);
// Produce the r-value.
return atomics.convertTempToRValue(tempAddr, resultSlot, loc);
}
// Okay, we're doing this natively.
llvm::Value *addr = atomics.emitCastToAtomicIntPointer(src.getAddress());
llvm::LoadInst *load = Builder.CreateLoad(addr, "atomic-load");
load->setAtomic(llvm::SequentiallyConsistent);
// Other decoration.
load->setAlignment(src.getAlignment().getQuantity());
if (src.isVolatileQualified())
load->setVolatile(true);
if (src.getTBAAInfo())
CGM.DecorateInstruction(load, src.getTBAAInfo());
// Okay, turn that back into the original value type.
QualType valueType = atomics.getValueType();
llvm::Value *result = load;
// If we're ignoring an aggregate return, don't do anything.
if (atomics.getEvaluationKind() == TEK_Aggregate && resultSlot.isIgnored())
return RValue::getAggregate(0, false);
// The easiest way to do this this is to go through memory, but we
// try not to in some easy cases.
if (atomics.getEvaluationKind() == TEK_Scalar && !atomics.hasPadding()) {
llvm::Type *resultTy = CGM.getTypes().ConvertTypeForMem(valueType);
if (isa<llvm::IntegerType>(resultTy)) {
assert(result->getType() == resultTy);
result = EmitFromMemory(result, valueType);
} else if (isa<llvm::PointerType>(resultTy)) {
result = Builder.CreateIntToPtr(result, resultTy);
} else {
result = Builder.CreateBitCast(result, resultTy);
}
return RValue::get(result);
}
// Create a temporary. This needs to be big enough to hold the
// atomic integer.
llvm::Value *temp;
bool tempIsVolatile = false;
CharUnits tempAlignment;
if (atomics.getEvaluationKind() == TEK_Aggregate) {
assert(!resultSlot.isIgnored());
temp = resultSlot.getAddr();
tempAlignment = atomics.getValueAlignment();
tempIsVolatile = resultSlot.isVolatile();
} else {
temp = CreateMemTemp(atomics.getAtomicType(), "atomic-load-temp");
tempAlignment = atomics.getAtomicAlignment();
}
// Slam the integer into the temporary.
llvm::Value *castTemp = atomics.emitCastToAtomicIntPointer(temp);
Builder.CreateAlignedStore(result, castTemp, tempAlignment.getQuantity())
->setVolatile(tempIsVolatile);
return atomics.convertTempToRValue(temp, resultSlot, loc);
}
