Functions
bool	canCoerceMustAliasedValueToLoad (Value StoredVal, Type LoadTy, const DataLayout &DL)
	Return true if CoerceAvailableValueToLoadType would succeed if it was called.

Value *	coerceAvailableValueToLoadType (Value StoredVal, Type LoadedTy, IRBuilderBase &IRB, const DataLayout &DL)
	If we saw a store of a value to memory, and then a load from a must-aliased pointer of a different type, try to coerce the stored value to the loaded type.

int	analyzeLoadFromClobberingStore (Type LoadTy, Value LoadPtr, StoreInst *DepSI, const DataLayout &DL)
	This function determines whether a value for the pointer LoadPtr can be extracted from the store at DepSI.

int	analyzeLoadFromClobberingLoad (Type LoadTy, Value LoadPtr, LoadInst *DepLI, const DataLayout &DL)
	This function determines whether a value for the pointer LoadPtr can be extracted from the load at DepLI.

int	analyzeLoadFromClobberingMemInst (Type LoadTy, Value LoadPtr, MemIntrinsic *DepMI, const DataLayout &DL)
	This function determines whether a value for the pointer LoadPtr can be extracted from the memory intrinsic at DepMI.

Value *	getValueForLoad (Value SrcVal, unsigned Offset, Type LoadTy, Instruction *InsertPt, const DataLayout &DL)
	If analyzeLoadFromClobberingStore/Load returned an offset, this function can be used to actually perform the extraction of the bits from the store.

Constant *	getConstantValueForLoad (Constant SrcVal, unsigned Offset, Type LoadTy, const DataLayout &DL)

Value *	getMemInstValueForLoad (MemIntrinsic SrcInst, unsigned Offset, Type LoadTy, Instruction *InsertPt, const DataLayout &DL)
	If analyzeLoadFromClobberingMemInst returned an offset, this function can be used to actually perform the extraction of the bits from the memory intrinsic.

Constant *	getConstantMemInstValueForLoad (MemIntrinsic SrcInst, unsigned Offset, Type LoadTy, const DataLayout &DL)

static bool	isFirstClassAggregateOrScalableType (Type *Ty)

static int	analyzeLoadFromClobberingWrite (Type LoadTy, Value LoadPtr, Value *WritePtr, uint64_t WriteSizeInBits, const DataLayout &DL)
	This function is called when we have a memdep query of a load that ends up being a clobbering memory write (store, memset, memcpy, memmove).

static Value *	getStoreValueForLoadHelper (Value SrcVal, unsigned Offset, Type LoadTy, IRBuilderBase &Builder, const DataLayout &DL)

Function Documentation

◆ analyzeLoadFromClobberingLoad()

int llvm::VNCoercion::analyzeLoadFromClobberingLoad	(	Type *	LoadTy,
		Value *	LoadPtr,
		LoadInst *	DepLI,
		const DataLayout &	DL
	)

This function determines whether a value for the pointer LoadPtr can be extracted from the load at DepLI.

This function is called when we have a memdep query of a load that ends up being clobbered by another load.

On success, it returns the offset into DepLI that extraction would start. On failure, it returns -1.

See if the other load can feed into the second load.

Definition at line 232 of file VNCoercion.cpp.

References analyzeLoadFromClobberingWrite(), canCoerceMustAliasedValueToLoad(), DL, llvm::LoadInst::getPointerOperand(), llvm::Value::getType(), llvm::Type::isArrayTy(), and llvm::Type::isStructTy().

◆ analyzeLoadFromClobberingMemInst()

int llvm::VNCoercion::analyzeLoadFromClobberingMemInst	(	Type *	LoadTy,
		Value *	LoadPtr,
		MemIntrinsic *	DepMI,
		const DataLayout &	DL
	)

This function determines whether a value for the pointer LoadPtr can be extracted from the memory intrinsic at DepMI.

On success, it returns the offset into DepMI that extraction would start. On failure, it returns -1.

Definition at line 246 of file VNCoercion.cpp.

References analyzeLoadFromClobberingWrite(), llvm::ConstantFoldLoadFromConstPtr(), DL, llvm::Type::getScalarType(), llvm::MemTransferBase< BaseCL >::getSource(), llvm::getUnderlyingObject(), llvm::ConstantInt::getZExtValue(), llvm::GlobalVariable::hasDefinitiveInitializer(), llvm::GlobalVariable::isConstant(), MI, and llvm::Offset.

◆ analyzeLoadFromClobberingStore()

int llvm::VNCoercion::analyzeLoadFromClobberingStore	(	Type *	LoadTy,
		Value *	LoadPtr,
		StoreInst *	DepSI,
		const DataLayout &	DL
	)

This function determines whether a value for the pointer LoadPtr can be extracted from the store at DepSI.

This function is called when we have a memdep query of a load that ends up being a clobbering store.

On success, it returns the offset into DepSI that extraction would start. On failure, it returns -1.

Definition at line 211 of file VNCoercion.cpp.

References analyzeLoadFromClobberingWrite(), canCoerceMustAliasedValueToLoad(), DL, llvm::StoreInst::getPointerOperand(), llvm::Value::getType(), llvm::StoreInst::getValueOperand(), and isFirstClassAggregateOrScalableType().

◆ analyzeLoadFromClobberingWrite()

static int llvm::VNCoercion::analyzeLoadFromClobberingWrite	(	Type *	LoadTy,
		Value *	LoadPtr,
		Value *	WritePtr,
		uint64_t	WriteSizeInBits,
		const DataLayout &	DL
	)

static

This function is called when we have a memdep query of a load that ends up being a clobbering memory write (store, memset, memcpy, memmove).

This means that the write may provide bits used by the load but we can't be sure because the pointers don't must-alias.

Check this case to see if there is anything more we can do before we give up. This returns -1 if we have to give up, or a byte number in the stored value of the piece that feeds the load.

Definition at line 173 of file VNCoercion.cpp.

References DL, llvm::GetPointerBaseWithConstantOffset(), and isFirstClassAggregateOrScalableType().

Referenced by analyzeLoadFromClobberingLoad(), analyzeLoadFromClobberingMemInst(), and analyzeLoadFromClobberingStore().

◆ canCoerceMustAliasedValueToLoad()

bool llvm::VNCoercion::canCoerceMustAliasedValueToLoad	(	Value *	StoredVal,
		Type *	LoadTy,
		const DataLayout &	DL
	)

Return true if CoerceAvailableValueToLoadType would succeed if it was called.

Return true if coerceAvailableValueToLoadType will succeed.

Definition at line 18 of file VNCoercion.cpp.

References llvm::alignTo(), DL, llvm::Type::getPointerAddressSpace(), llvm::Type::getScalarType(), llvm::Value::getType(), isFirstClassAggregateOrScalableType(), and llvm::Type::isTargetExtTy().

Referenced by analyzeLoadFromClobberingLoad(), analyzeLoadFromClobberingStore(), and coerceAvailableValueToLoadType().

◆ coerceAvailableValueToLoadType()

Value * llvm::VNCoercion::coerceAvailableValueToLoadType	(	Value *	StoredVal,
		Type *	LoadedTy,
		IRBuilderBase &	Helper,
		const DataLayout &	DL
	)

If we saw a store of a value to memory, and then a load from a must-aliased pointer of a different type, try to coerce the stored value to the loaded type.

If we saw a store of a value to memory, and then a load from a must-aliased pointer of a different type, try to coerce the stored value.

LoadedTy is the type of the load we want to replace. IRB is IRBuilder used to insert new instructions.

If we can't do it, return null.

Definition at line 76 of file VNCoercion.cpp.

References assert(), llvm::CallingConv::C, canCoerceMustAliasedValueToLoad(), llvm::ConstantFoldConstant(), llvm::IRBuilderBase::CreateBitCast(), llvm::IRBuilderBase::CreateIntToPtr(), llvm::IRBuilderBase::CreateLShr(), llvm::IRBuilderBase::CreatePtrToInt(), llvm::IRBuilderBase::CreateTruncOrBitCast(), DL, llvm::IntegerType::get(), llvm::Type::getContext(), llvm::Value::getType(), llvm::Type::isIntegerTy(), and llvm::Type::isPtrOrPtrVectorTy().

Referenced by getMemInstValueForLoad(), and getValueForLoad().

◆ getConstantMemInstValueForLoad()

Constant * llvm::VNCoercion::getConstantMemInstValueForLoad	(	MemIntrinsic *	SrcInst,
		unsigned	Offset,
		Type *	LoadTy,
		const DataLayout &	DL
	)

Definition at line 407 of file VNCoercion.cpp.

References llvm::ConstantFoldLoadFromConst(), llvm::ConstantFoldLoadFromConstPtr(), DL, llvm::Type::getContext(), llvm::MemTransferBase< BaseCL >::getSource(), llvm::APInt::getSplat(), and llvm::Offset.

◆ getConstantValueForLoad()

Constant * llvm::VNCoercion::getConstantValueForLoad	(	Constant *	SrcVal,
		unsigned	Offset,
		Type *	LoadTy,
		const DataLayout &	DL
	)

Definition at line 348 of file VNCoercion.cpp.

References assert(), llvm::ConstantFoldLoadFromConst(), DL, llvm::Value::getType(), and llvm::Offset.

◆ getMemInstValueForLoad()

Value * llvm::VNCoercion::getMemInstValueForLoad	(	MemIntrinsic *	SrcInst,
		unsigned	Offset,
		Type *	LoadTy,
		Instruction *	InsertPt,
		const DataLayout &	DL
	)

If analyzeLoadFromClobberingMemInst returned an offset, this function can be used to actually perform the extraction of the bits from the memory intrinsic.

This function is called when we have a memdep query of a load that ends up being a clobbering mem intrinsic.

It inserts instructions to do so at InsertPt, and returns the extracted value.

Definition at line 360 of file VNCoercion.cpp.

References coerceAvailableValueToLoadType(), llvm::ConstantFoldLoadFromConstPtr(), llvm::IRBuilderBase::CreateOr(), llvm::IRBuilderBase::CreateShl(), llvm::IRBuilderBase::CreateZExtOrBitCast(), DL, llvm::IntegerType::get(), llvm::Type::getContext(), llvm::MemTransferBase< BaseCL >::getSource(), llvm::Value::getType(), and llvm::Offset.

Referenced by llvm::gvn::AvailableValue::MaterializeAdjustedValue().

◆ getStoreValueForLoadHelper()

static Value * llvm::VNCoercion::getStoreValueForLoadHelper	(	Value *	SrcVal,
		unsigned	Offset,
		Type *	LoadTy,
		IRBuilderBase &	Builder,
		const DataLayout &	DL
	)