#include "llvm/Analysis/InstructionPrecedenceTracking.h"

Inheritance diagram for llvm::MemoryWriteTracking:

Public Member Functions
const Instruction *	getFirstMemoryWrite (const BasicBlock *BB)
	Returns the topmost instruction that may write memory from the given basic block.

bool	mayWriteToMemory (const BasicBlock *BB)
	Returns true if at least one instruction from the given basic block may write memory.

bool	isDominatedByMemoryWriteFromSameBlock (const Instruction *Insn)
	Returns true if the first memory writing instruction of Insn's block exists and dominates Insn.

bool	isSpecialInstruction (const Instruction *Insn) const override
	A predicate that defines whether or not the instruction `Insn` is considered special and needs to be tracked.

Public Member Functions inherited from llvm::InstructionPrecedenceTracking
void	insertInstructionTo (const Instruction Inst, const BasicBlock BB)
	Notifies this tracking that we are going to insert a new instruction `Inst` to the basic block `BB`.

void	removeInstruction (const Instruction *Inst)
	Notifies this tracking that we are going to remove the instruction `Inst` It makes all necessary updates to internal caches to keep them consistent.

void	removeUsersOf (const Instruction *Inst)
	Notifies this tracking that we are going to replace all uses of `Inst`.

void	clear ()
	Invalidates all information from this tracking.

Additional Inherited Members
Protected Member Functions inherited from llvm::InstructionPrecedenceTracking
const Instruction *	getFirstSpecialInstruction (const BasicBlock *BB)
	Returns the topmost special instruction from the block `BB`.

bool	hasSpecialInstructions (const BasicBlock *BB)
	Returns true iff at least one instruction from the basic block `BB` is special.

bool	isPreceededBySpecialInstruction (const Instruction *Insn)
	Returns true iff the first special instruction of `Insn's` block exists and dominates `Insn`.

virtual bool	isSpecialInstruction (const Instruction *Insn) const =0
	A predicate that defines whether or not the instruction `Insn` is considered special and needs to be tracked.

virtual	~InstructionPrecedenceTracking ()=default

Detailed Description

Definition at line 121 of file InstructionPrecedenceTracking.h.

Member Function Documentation

◆ getFirstMemoryWrite()

const Instruction * llvm::MemoryWriteTracking::getFirstMemoryWrite ( const BasicBlock * BB )

inline

Returns the topmost instruction that may write memory from the given basic block.

Returns nullptr if there is no such instructions in the block.

Definition at line 125 of file InstructionPrecedenceTracking.h.

References llvm::InstructionPrecedenceTracking::getFirstSpecialInstruction().

◆ isDominatedByMemoryWriteFromSameBlock()

bool llvm::MemoryWriteTracking::isDominatedByMemoryWriteFromSameBlock ( const Instruction * Insn )

inline

Returns true if the first memory writing instruction of Insn's block exists and dominates Insn.

Definition at line 137 of file InstructionPrecedenceTracking.h.

References Insn, and llvm::InstructionPrecedenceTracking::isPreceededBySpecialInstruction().

Referenced by llvm::ICFLoopSafetyInfo::doesNotWriteMemoryBefore().

◆ isSpecialInstruction()

bool MemoryWriteTracking::isSpecialInstruction ( const Instruction * Insn ) const

overridevirtual

A predicate that defines whether or not the instruction Insn is considered special and needs to be tracked.

Implementing this method in children classes allows to implement tracking of implicit control flow, memory writing instructions or any other kinds of instructions we might be interested in.

Implements llvm::InstructionPrecedenceTracking.

Definition at line 147 of file InstructionPrecedenceTracking.cpp.

References Insn, and llvm::PatternMatch::match().