SimplifyCFGPass.cpp File Reference (original) (raw)

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Functions
	STATISTIC (NumSimpl, "Number of blocks simplified")

static bool	performBlockTailMerging (Function &F, ArrayRef< BasicBlock * > BBs, std::vector< DominatorTree::UpdateType > *Updates)

static bool	tailMergeBlocksWithSimilarFunctionTerminators (Function &F, DomTreeUpdater *DTU)

static bool	iterativelySimplifyCFG (Function &F, const TargetTransformInfo &TTI, DomTreeUpdater *DTU, const SimplifyCFGOptions &Options)
	Call SimplifyCFG on all the blocks in the function, iterating until no more changes are made.

static bool	simplifyFunctionCFGImpl (Function &F, const TargetTransformInfo &TTI, DominatorTree *DT, const SimplifyCFGOptions &Options)

static bool	simplifyFunctionCFG (Function &F, const TargetTransformInfo &TTI, DominatorTree *DT, const SimplifyCFGOptions &Options)

static void	applyCommandLineOverridesToOptions (SimplifyCFGOptions &Options)

	INITIALIZE_PASS_BEGIN (CFGSimplifyPass, "simplifycfg", "Simplify the CFG", false, false) INITIALIZE_PASS_END(CFGSimplifyPass

Variables
static cl::opt< unsigned >	UserBonusInstThreshold ("bonus-inst-threshold", cl::Hidden, cl::init(1), cl::desc("Control the number of bonus instructions (default = 1)"))

static cl::opt< bool >	UserKeepLoops ("keep-loops", cl::Hidden, cl::init(true), cl::desc("Preserve canonical loop structure (default = true)"))

static cl::opt< bool >	UserSwitchRangeToICmp ("switch-range-to-icmp", cl::Hidden, cl::init(false), cl::desc("Convert switches into an integer range comparison (default = false)"))

static cl::opt< bool >	UserSwitchToLookup ("switch-to-lookup", cl::Hidden, cl::init(false), cl::desc("Convert switches to lookup tables (default = false)"))

static cl::opt< bool >	UserForwardSwitchCond ("forward-switch-cond", cl::Hidden, cl::init(false), cl::desc("Forward switch condition to phi ops (default = false)"))

static cl::opt< bool >	UserHoistCommonInsts ("hoist-common-insts", cl::Hidden, cl::init(false), cl::desc("hoist common instructions (default = false)"))

static cl::opt< bool >	UserHoistLoadsStoresWithCondFaulting ("hoist-loads-stores-with-cond-faulting", cl::Hidden, cl::init(false), cl::desc("Hoist loads/stores if the target supports conditional faulting " "(default = false)"))

static cl::opt< bool >	UserSinkCommonInsts ("sink-common-insts", cl::Hidden, cl::init(false), cl::desc("Sink common instructions (default = false)"))

static cl::opt< bool >	UserSpeculateUnpredictables ("speculate-unpredictables", cl::Hidden, cl::init(false), cl::desc("Speculate unpredictable branches (default = false)"))

	simplifycfg

Simplify the	CFG

Simplify the	false

◆ DEBUG_TYPE

#define DEBUG_TYPE "simplifycfg"

◆ applyCommandLineOverridesToOptions()

Definition at line 320 of file SimplifyCFGPass.cpp.

References llvm:🆑:Option::getNumOccurrences(), Options, UserBonusInstThreshold, UserForwardSwitchCond, UserHoistCommonInsts, UserHoistLoadsStoresWithCondFaulting, UserKeepLoops, UserSinkCommonInsts, UserSpeculateUnpredictables, UserSwitchRangeToICmp, and UserSwitchToLookup.

Referenced by llvm::SimplifyCFGPass::SimplifyCFGPass().

◆ INITIALIZE_PASS_BEGIN()

INITIALIZE_PASS_BEGIN	(	CFGSimplifyPass	,
"simplifycfg"	,
"Simplify the CFG"	,
false	,
false
)

◆ iterativelySimplifyCFG()

Call SimplifyCFG on all the blocks in the function, iterating until no more changes are made.

Definition at line 231 of file SimplifyCFGPass.cpp.

References assert(), llvm::SmallPtrSetImpl< PtrType >::begin(), llvm::SmallPtrSetImpl< PtrType >::end(), F, llvm::FindFunctionBackedges(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::GenericDomTreeUpdater< DerivedT, DomTreeT, PostDomTreeT >::isBBPendingDeletion(), Options, and llvm::simplifyCFG().

Referenced by simplifyFunctionCFGImpl().

◆ performBlockTailMerging()

Definition at line 91 of file SimplifyCFGPass.cpp.

References assert(), llvm::BranchInst::Create(), llvm::BasicBlock::Create(), llvm::PHINode::Create(), llvm::BasicBlock::end(), F, llvm::DILocation::getMergedLocation(), llvm::Value::getName(), llvm::Instruction::getOpcode(), getType(), I, llvm::Instruction::insertInto(), llvm::User::operands(), llvm::SmallVectorImpl< T >::reserve(), llvm::SmallVectorImpl< T >::resize(), llvm::Instruction::setDebugLoc(), llvm::ArrayRef< T >::size(), and llvm::zip().

Referenced by tailMergeBlocksWithSimilarFunctionTerminators().

◆ simplifyFunctionCFG()

◆ simplifyFunctionCFGImpl()

◆ STATISTIC()

STATISTIC	(	NumSimpl	,
"Number of blocks simplified"
)

◆ tailMergeBlocksWithSimilarFunctionTerminators()

Definition at line 165 of file SimplifyCFGPass.cpp.

References llvm::any_of(), llvm::GenericDomTreeUpdater< DerivedT, DomTreeT, PostDomTreeT >::applyUpdates(), F, llvm::GenericDomTreeUpdater< DerivedT, DomTreeT, PostDomTreeT >::isBBPendingDeletion(), llvm::make_second_range(), performBlockTailMerging(), and llvm::succ_empty().

Referenced by simplifyFunctionCFGImpl().

◆ CFG

◆ false

◆ simplifycfg

◆ UserBonusInstThreshold

cl::opt< unsigned > UserBonusInstThreshold("bonus-inst-threshold", cl::Hidden, cl::init(1), cl::desc("Control the number of bonus instructions (default = 1)")) ( "bonus-inst-threshold" , cl::Hidden , cl::init(1) , cl::desc("Control the number of bonus instructions (default = 1)") )	static

◆ UserForwardSwitchCond

cl::opt< bool > UserForwardSwitchCond("forward-switch-cond", cl::Hidden, cl::init(false), cl::desc("Forward switch condition to phi ops (default = false)")) ( "forward-switch-cond" , cl::Hidden , cl::init(false) , cl::desc("Forward switch condition to phi ops (default = false)") )	static

◆ UserHoistCommonInsts

cl::opt< bool > UserHoistCommonInsts("hoist-common-insts", cl::Hidden, cl::init(false), cl::desc("hoist common instructions (default = false)")) ( "hoist-common-insts" , cl::Hidden , cl::init(false) , cl::desc("hoist common instructions (default = false)") )	static

◆ UserHoistLoadsStoresWithCondFaulting

cl::opt< bool > UserHoistLoadsStoresWithCondFaulting("hoist-loads-stores-with-cond-faulting", cl::Hidden, cl::init(false), cl::desc("Hoist loads/stores if the target supports conditional faulting " "(default = false)")) ( "hoist-loads-stores-with-cond-faulting" , cl::Hidden , cl::init(false) , cl::desc("Hoist loads/stores if the target supports conditional faulting " "(default = false)") )	static

◆ UserKeepLoops

cl::opt< bool > UserKeepLoops("keep-loops", cl::Hidden, cl::init(true), cl::desc("Preserve canonical loop structure (default = true)")) ( "keep-loops" , cl::Hidden , cl::init(true) , cl::desc("Preserve canonical loop structure (default = true)") )	static

◆ UserSinkCommonInsts

cl::opt< bool > UserSinkCommonInsts("sink-common-insts", cl::Hidden, cl::init(false), cl::desc("Sink common instructions (default = false)")) ( "sink-common-insts" , cl::Hidden , cl::init(false) , cl::desc("Sink common instructions (default = false)") )	static

◆ UserSpeculateUnpredictables

cl::opt< bool > UserSpeculateUnpredictables("speculate-unpredictables", cl::Hidden, cl::init(false), cl::desc("Speculate unpredictable branches (default = false)")) ( "speculate-unpredictables" , cl::Hidden , cl::init(false) , cl::desc("Speculate unpredictable branches (default = false)") )	static

◆ UserSwitchRangeToICmp

cl::opt< bool > UserSwitchRangeToICmp("switch-range-to-icmp", cl::Hidden, cl::init(false), cl::desc( "Convert switches into an integer range comparison (default = false)")) ( "switch-range-to-icmp" , cl::Hidden , cl::init(false) , cl::desc( "Convert switches into an integer range comparison (default = false)") )	static

◆ UserSwitchToLookup

cl::opt< bool > UserSwitchToLookup("switch-to-lookup", cl::Hidden, cl::init(false), cl::desc("Convert switches to lookup tables (default = false)")) ( "switch-to-lookup" , cl::Hidden , cl::init(false) , cl::desc("Convert switches to lookup tables (default = false)") )	static