llvm::BranchFolder Class Reference

#include "CodeGen/BranchFolding.h"

Classes
class	MBFIWrapper
	This class keeps track of branch frequencies of newly created blocks and tail-merged blocks. More...

Public Member Functions
	BranchFolder (bool defaultEnableTailMerge, bool CommonHoist, MBFIWrapper &FreqInfo, const MachineBranchProbabilityInfo &ProbInfo, unsigned MinTailLength=0)
bool	OptimizeFunction (MachineFunction &MF, const TargetInstrInfo *tii, const TargetRegisterInfo *tri, MachineModuleInfo *mmi, MachineLoopInfo *mli=nullptr, bool AfterPlacement=false)
	Perhaps branch folding, tail merging and other CFG optimizations on the given function. More...

Detailed Description

Definition at line 35 of file BranchFolding.h.

Constructor & Destructor Documentation

BranchFolder()

BranchFolder::BranchFolder ( bool  defaultEnableTailMerge, bool  CommonHoist, MBFIWrapper &  FreqInfo, const MachineBranchProbabilityInfo &  ProbInfo, unsigned  MinTailLength = 0  )

explicit

Definition at line 138 of file BranchFolding.cpp.

References assert(), llvm::cl::BOU_FALSE, llvm::cl::BOU_TRUE, llvm::cl::BOU_UNSET, llvm::dbgs(), llvm::MachineFunction::erase(), FlagEnableTailMerge, llvm::MachineBasicBlock::getParent(), LLVM_DEBUG, llvm::MachineBasicBlock::pred_empty(), llvm::MachineLoopInfo::removeBlock(), llvm::MachineBasicBlock::removeSuccessor(), llvm::MachineBasicBlock::succ_empty(), llvm::MachineBasicBlock::succ_end(), and TailMergeSize.

Member Function Documentation

OptimizeFunction()

bool BranchFolder::OptimizeFunction	(	MachineFunction &	MF,
		const TargetInstrInfo *	tii,
		const TargetRegisterInfo *	tri,
		MachineModuleInfo *	mmi,
		MachineLoopInfo *	mli = nullptr,
		bool	AfterPlacement = false
	)

Perhaps branch folding, tail merging and other CFG optimizations on the given function.

Block placement changes the layout and may create new tail merging opportunities.

Definition at line 172 of file BranchFolding.cpp.

References llvm::TargetInstrInfo::analyzeBranch(), llvm::MachineBasicBlock::CorrectExtraCFGEdges(), llvm::SmallVectorBase::empty(), llvm::getEHScopeMembership(), llvm::MachineJumpTableInfo::getJumpTables(), llvm::MachineFunction::getRegInfo(), I, llvm::MachineRegisterInfo::invalidateLiveness(), llvm::MachineJumpTableInfo::RemoveJumpTable(), llvm::BitVector::set(), llvm::TargetRegisterInfo::trackLivenessAfterRegAlloc(), and llvm::MachineRegisterInfo::tracksLiveness().

Referenced by getLayoutSuccessorProbThreshold(), and INITIALIZE_PASS().

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The documentation for this class was generated from the following files:

• lib/CodeGen/BranchFolding.h
• lib/CodeGen/BranchFolding.cpp