¶llvm::Value* FindAvailablePtrLoadStore(
    llvm::Value* Ptr,
    llvm::Type* AccessTy,
    bool AtLeastAtomic,
    llvm::BasicBlock* ScanBB,
    BasicBlock::iterator& ScanFrom,
    unsigned int MaxInstsToScan,
    llvm::AliasAnalysis* AA,
    bool* IsLoad,
    unsigned int* NumScanedInst)

Description

Scan backwards to see if we have the value of the given pointer available locally within a small number of instructions. You can use this function to scan across multiple blocks: after you call this function, if ScanFrom points at the beginning of the block, it's safe to continue scanning the predecessors.

Declared at: llvm/include/llvm/Analysis/Loads.h:150

Parameters

llvm::Value* Ptr

The pointer we want the load and store to originate from.

llvm::Type* AccessTy

The access type of the pointer.

bool AtLeastAtomic

Are we looking for at-least an atomic load/store ? In case it is false, we can return an atomic or non-atomic load or store. In case it is true, we need to return an atomic load or store.

llvm::BasicBlock* ScanBB

The basic block to scan.

BasicBlock::iterator& ScanFrom

The location to start scanning from. When this function returns, it points at the last instruction scanned.

unsigned int MaxInstsToScan

The maximum number of instructions to scan. If this is zero, the whole block will be scanned.

llvm::AliasAnalysis* AA

Optional pointer to alias analysis, to make the scan more precise.

bool* IsLoad

Whether the returned value is a load from the same location in memory, as opposed to the value operand of a store.

unsigned int* NumScanedInst

Returns

The found value, or nullptr if no value is found.