MoveAutoInit.cpp File Reference

#include "llvm/Transforms/Utils/MoveAutoInit.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/MemorySSA.h"
#include "llvm/Analysis/MemorySSAUpdater.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Transforms/Utils/LoopUtils.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "move-auto-init"

Functions
	STATISTIC (NumMoved, "Number of instructions moved")
static bool	hasAutoInitMetadata (const Instruction &I)
static std::optional< MemoryLocation >	writeToAlloca (const Instruction &I)
static BasicBlock *	usersDominator (const MemoryLocation &ML, Instruction *I, DominatorTree &DT, MemorySSA &MSSA)
	Finds a BasicBlock in the CFG where instruction I can be moved to while not changing the Memory SSA ordering and being guarded by at least one condition.
static bool	runMoveAutoInit (Function &F, DominatorTree &DT, MemorySSA &MSSA)

Variables
static cl::opt< unsigned >	MoveAutoInitThreshold ("move-auto-init-threshold", cl::Hidden, cl::init(128), cl::desc("Maximum instructions to analyze per moved initialization"))

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "move-auto-init"

Definition at line 29 of file MoveAutoInit.cpp.

Function Documentation

hasAutoInitMetadata()

static bool hasAutoInitMetadata ( const Instruction &  I )

static

Definition at line 37 of file MoveAutoInit.cpp.

References llvm::any_of(), and I.

Referenced by runMoveAutoInit().

runMoveAutoInit()

static bool runMoveAutoInit ( Function &  F, DominatorTree &  DT, MemorySSA &  MSSA  )

static

Definition at line 104 of file MoveAutoInit.cpp.

References llvm::SmallPtrSetImpl< PtrType >::count(), llvm::SmallVectorImpl< T >::emplace_back(), llvm::SmallVectorBase< Size_T >::empty(), F, llvm::DominatorTree::findNearestCommonDominator(), llvm::BasicBlock::getFirstNonPHI(), llvm::MemorySSA::getMemoryAccess(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::BasicBlock::getUniquePredecessor(), hasAutoInitMetadata(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::DominatorTree::isReachableFromEntry(), ML, llvm::MemorySSAUpdater::moveToPlace(), llvm::SmallVectorImpl< T >::pop_back_val(), llvm::predecessors(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::reverse(), llvm::SmallVectorBase< Size_T >::size(), llvm::Successor, llvm::successors(), usersDominator(), llvm::MemorySSA::verifyMemorySSA(), llvm::VerifyMemorySSA, and writeToAlloca().

Referenced by llvm::MoveAutoInitPass::run().

STATISTIC()

STATISTIC	(	NumMoved	,
		"Number of instructions moved"
	)

usersDominator()

static BasicBlock * usersDominator ( const MemoryLocation &  ML, Instruction *  I, DominatorTree &  DT, MemorySSA &  MSSA  )

static

Finds a BasicBlock in the CFG where instruction I can be moved to while not changing the Memory SSA ordering and being guarded by at least one condition.

Definition at line 61 of file MoveAutoInit.cpp.

References llvm::append_range(), llvm::SmallVectorBase< Size_T >::empty(), llvm::DominatorTree::findNearestCommonDominator(), llvm::MemorySSA::getAA(), llvm::MemorySSA::getMemoryAccess(), llvm::BatchAAResults::getModRefInfo(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::map_range(), MI, ML, MoveAutoInitThreshold, llvm::SmallVectorImpl< T >::pop_back_val(), llvm::SmallPtrSetImplBase::size(), and llvm::Value::users().

Referenced by runMoveAutoInit().

writeToAlloca()

static std::optional< MemoryLocation > writeToAlloca ( const Instruction &  I )

static

Definition at line 43 of file MoveAutoInit.cpp.

References llvm::MemoryLocation::get(), llvm::MemoryLocation::getForDest(), llvm::getUnderlyingObject(), I, MI, and ML.

Referenced by runMoveAutoInit().

Variable Documentation

MoveAutoInitThreshold

cl::opt< unsigned > MoveAutoInitThreshold("move-auto-init-threshold", cl::Hidden, cl::init(128), cl::desc("Maximum instructions to analyze per moved initialization")) ( "move-auto-init-threshold"  , cl::Hidden  , cl::init(128)  , cl::desc("Maximum instructions to analyze per moved initialization")    )

static

Referenced by usersDominator().