llvm::BranchFolder Class Reference

#include "CodeGen/BranchFolding.h"

Public Member Functions
	BranchFolder (bool DefaultEnableTailMerge, bool CommonHoist, MBFIWrapper &FreqInfo, const MachineBranchProbabilityInfo &ProbInfo, ProfileSummaryInfo *PSI, unsigned MinTailLength=0)
bool	OptimizeFunction (MachineFunction &MF, const TargetInstrInfo *tii, const TargetRegisterInfo *tri, MachineLoopInfo *mli=nullptr, bool AfterPlacement=false)
	Perhaps branch folding, tail merging and other CFG optimizations on the given function.
void	setBasicBlockReordering (bool Enable)
	Enable or disable the basic-block reordering sub-phase of branch optimization.

Detailed Description

Definition at line 31 of file BranchFolding.h.

Constructor & Destructor Documentation

BranchFolder()

BranchFolder::BranchFolder ( bool DefaultEnableTailMerge, bool CommonHoist, MBFIWrapper & FreqInfo, const MachineBranchProbabilityInfo & ProbInfo, ProfileSummaryInfo * PSI, unsigned MinTailLength = 0 )

explicit

Definition at line 192 of file BranchFolding.cpp.

References llvm::cl::BOU_FALSE, llvm::cl::BOU_TRUE, llvm::cl::BOU_UNSET, and FlagEnableTailMerge.

Member Function Documentation

OptimizeFunction()

bool BranchFolder::OptimizeFunction	(	MachineFunction &	MF,
		const TargetInstrInfo *	tii,
		const TargetRegisterInfo *	tri,
		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 236 of file BranchFolding.cpp.

References llvm::cl::BOU_TRUE, llvm::cl::BOU_UNSET, FlagEnableBlockReordering, FlagEnableHoistCommonCode, llvm::getEHScopeMembership(), llvm::MachineFunction::getJumpTableInfo(), llvm::MachineJumpTableInfo::getJumpTables(), llvm::MachineFunction::getRegInfo(), I, llvm::MachineJumpTableInfo::RemoveJumpTable(), llvm::BitVector::set(), llvm::BitVector::size(), TailMergeSize, llvm::BitVector::test(), and llvm::MachineRegisterInfo::tracksLiveness().

setBasicBlockReordering()

void llvm::BranchFolder::setBasicBlockReordering ( bool Enable )

inline

Enable or disable the basic-block reordering sub-phase of branch optimization.

Enabled by default; targets sensitive to block layout (e.g. those with structured-CFG register allocation) can disable it.

Definition at line 52 of file BranchFolding.h.

References llvm::Enable.

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

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