Helper class for promoting a collection of loads and stores into SSA Form using the SSAUpdater. More...

#include <SSAUpdater.h>

Collaboration diagram for llvm::LoadAndStorePromoter:

Public Member Functions
	LoadAndStorePromoter (const SmallVectorImpl< Instruction * > &Insts, SSAUpdater &S, StringRef Name=StringRef())

virtual	~LoadAndStorePromoter ()

void	run (const SmallVectorImpl< Instruction * > &Insts) const
	This does the promotion. More...

virtual bool	isInstInList (Instruction I, const SmallVectorImpl< Instruction > &Insts) const
	Return true if the specified instruction is in the Inst list. More...

virtual void	doExtraRewritesBeforeFinalDeletion () const
	This hook is invoked after all the stores are found and inserted as available values. More...

virtual void	replaceLoadWithValue (LoadInst LI, Value V) const
	Clients can choose to implement this to get notified right before a load is RAUW'd another value. More...

virtual void	instructionDeleted (Instruction *I) const
	Called before each instruction is deleted. More...

virtual void	updateDebugInfo (Instruction *I) const
	Called to update debug info associated with the instruction. More...

Protected Attributes
SSAUpdater &	SSA

Detailed Description

Helper class for promoting a collection of loads and stores into SSA Form using the SSAUpdater.

This handles complexities that SSAUpdater doesn't, such as multiple loads and stores in one block.

Clients of this class are expected to subclass this and implement the virtual methods.

Definition at line 133 of file SSAUpdater.h.

Constructor & Destructor Documentation

LoadAndStorePromoter::LoadAndStorePromoter	(	const SmallVectorImpl< Instruction * > &	Insts,
		SSAUpdater &	S,
		StringRef	Name = `StringRef()`
	)

Definition at line 325 of file SSAUpdater.cpp.

References llvm::SmallVectorBase::empty(), llvm::StringRef::empty(), llvm::Value::getName(), llvm::Value::getType(), llvm::SSAUpdater::Initialize(), LI, and SSA.

virtual llvm::LoadAndStorePromoter::~LoadAndStorePromoter ( )

inlinevirtual

Definition at line 139 of file SSAUpdater.h.

Member Function Documentation

virtual void llvm::LoadAndStorePromoter::doExtraRewritesBeforeFinalDeletion ( ) const

inlinevirtual

This hook is invoked after all the stores are found and inserted as available values.

Definition at line 158 of file SSAUpdater.h.

Referenced by run().

virtual void llvm::LoadAndStorePromoter::instructionDeleted ( Instruction * I ) const

inlinevirtual

Called before each instruction is deleted.

Definition at line 167 of file SSAUpdater.h.

Referenced by run().

bool LoadAndStorePromoter::isInstInList	(	Instruction *	I,
		const SmallVectorImpl< Instruction * > &	Insts
	)		const

virtual

Return true if the specified instruction is in the Inst list.

The Insts list is the one passed into the constructor. Clients should implement this with a more efficient version if possible.

Definition at line 488 of file SSAUpdater.cpp.

References llvm::SmallVectorTemplateCommon< T >::begin(), llvm::SmallVectorTemplateCommon< T >::end(), and I.

Referenced by run().

virtual void llvm::LoadAndStorePromoter::replaceLoadWithValue	(	LoadInst *	LI,
		Value *	V
	)		const

inlinevirtual

Clients can choose to implement this to get notified right before a load is RAUW'd another value.

Definition at line 163 of file SSAUpdater.h.

Referenced by run().

void LoadAndStorePromoter::run ( const SmallVectorImpl< Instruction * > & Insts ) const

This does the promotion.

Insts is a list of loads and stores to promote, and Name is the basename for the PHIs to insert. After this is complete, the loads and stores are removed from the code.

Definition at line 342 of file SSAUpdater.cpp.

References llvm::SSAUpdater::AddAvailableValue(), llvm::BasicBlock::begin(), llvm::TinyPtrVector< EltTy >::clear(), doExtraRewritesBeforeFinalDeletion(), llvm::TinyPtrVector< EltTy >::empty(), llvm::DenseMapBase< DenseMap< KeyT, ValueT, KeyInfoT >, KeyT, ValueT, KeyInfoT >::end(), llvm::BasicBlock::end(), llvm::Instruction::eraseFromParent(), llvm::DenseMapBase< DenseMap< KeyT, ValueT, KeyInfoT >, KeyT, ValueT, KeyInfoT >::find(), llvm::UndefValue::get(), llvm::Instruction::getParent(), llvm::Value::getType(), llvm::SSAUpdater::GetValueInMiddleOfBlock(), instructionDeleted(), isInstInList(), llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back(), llvm::Value::replaceAllUsesWith(), replaceLoadWithValue(), llvm::TinyPtrVector< EltTy >::size(), llvm::SmallVectorTemplateCommon< T >::size(), SSA, updateDebugInfo(), and llvm::Value::use_empty().