Helper class for promoting a collection of loads and stores into SSA Form using the SSAUpdater. More...
#include "llvm/Transforms/Utils/SSAUpdater.h"
Public Member Functions | |
| LoadAndStorePromoter (ArrayRef< const Instruction * > Insts, SSAUpdater &S, StringRef Name=StringRef()) | |
| virtual | ~LoadAndStorePromoter ()=default |
| void | run (const SmallVectorImpl< Instruction * > &Insts) |
| This does the promotion. | |
| virtual bool | isInstInList (Instruction *I, const SmallVectorImpl< Instruction * > &Insts) const |
| Return true if the specified instruction is in the Inst list. | |
| virtual void | doExtraRewritesBeforeFinalDeletion () |
| This hook is invoked after all the stores are found and inserted as available values. | |
| 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. | |
| virtual void | instructionDeleted (Instruction *I) const |
| Called before each instruction is deleted. | |
| virtual void | updateDebugInfo (Instruction *I) const |
| Called to update debug info associated with the instruction. | |
| virtual bool | shouldDelete (Instruction *I) const |
| Return false if a sub-class wants to keep one of the loads/stores after the SSA construction. | |
| virtual Value * | getValueToUseForAlloca (Instruction *AI) const |
| Return the value to use for the point in the code that the alloca is positioned. | |
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 151 of file SSAUpdater.h.
Constructor & Destructor Documentation
◆ LoadAndStorePromoter()
| LoadAndStorePromoter::LoadAndStorePromoter | ( | ArrayRef< const Instruction * > | Insts, |
| SSAUpdater & | S, | ||
| StringRef | Name = StringRef() |
||
| ) |
Definition at line 370 of file SSAUpdater.cpp.
References llvm::ArrayRef< T >::empty(), llvm::StringRef::empty(), llvm::Value::getName(), llvm::Value::getType(), llvm::SSAUpdater::Initialize(), and SSA.
◆ ~LoadAndStorePromoter()
|
virtualdefault |
Member Function Documentation
◆ doExtraRewritesBeforeFinalDeletion()
|
inlinevirtual |
This hook is invoked after all the stores are found and inserted as available values.
Definition at line 176 of file SSAUpdater.h.
Referenced by run().
◆ getValueToUseForAlloca()
|
inlinevirtual |
Return the value to use for the point in the code that the alloca is positioned.
This will only be used if an Alloca is included in Insts, otherwise the value of a uninitialized load will be assumed to be poison.
Reimplemented in BasicLoadAndStorePromoter.
Definition at line 195 of file SSAUpdater.h.
Referenced by run().
◆ instructionDeleted()
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inlinevirtual |
Called before each instruction is deleted.
Definition at line 183 of file SSAUpdater.h.
Referenced by run().
◆ isInstInList()
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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 538 of file SSAUpdater.cpp.
References I, and llvm::is_contained().
Referenced by run().
◆ replaceLoadWithValue()
|
inlinevirtual |
Clients can choose to implement this to get notified right before a load is RAUW'd another value.
Definition at line 180 of file SSAUpdater.h.
Referenced by run().
◆ run()
| void LoadAndStorePromoter::run | ( | const SmallVectorImpl< Instruction * > & | Insts | ) |
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 386 of file SSAUpdater.cpp.
References llvm::SSAUpdater::AddAvailableValue(), assert(), llvm::TinyPtrVector< EltTy >::clear(), doExtraRewritesBeforeFinalDeletion(), llvm::TinyPtrVector< EltTy >::empty(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::find(), llvm::PoisonValue::get(), llvm::Value::getType(), llvm::SSAUpdater::GetValueInMiddleOfBlock(), getValueToUseForAlloca(), I, instructionDeleted(), isInstInList(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::Value::replaceAllUsesWith(), replaceLoadWithValue(), shouldDelete(), llvm::TinyPtrVector< EltTy >::size(), SSA, updateDebugInfo(), and llvm::Value::use_empty().
◆ shouldDelete()
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inlinevirtual |
Return false if a sub-class wants to keep one of the loads/stores after the SSA construction.
Reimplemented in BasicLoadAndStorePromoter.
Definition at line 190 of file SSAUpdater.h.
Referenced by run().
◆ updateDebugInfo()
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inlinevirtual |
Called to update debug info associated with the instruction.
Definition at line 186 of file SSAUpdater.h.
Referenced by run().
Member Data Documentation
◆ SSA
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protected |
Definition at line 153 of file SSAUpdater.h.
Referenced by LoadAndStorePromoter(), and run().
The documentation for this class was generated from the following files:
- include/llvm/Transforms/Utils/SSAUpdater.h
- lib/Transforms/Utils/SSAUpdater.cpp
