llvm::LiveIntervalCalc Class Reference

#include "llvm/CodeGen/LiveIntervalCalc.h"

Inheritance diagram for llvm::LiveIntervalCalc:

Public Member Functions
	LiveIntervalCalc ()=default
void	createDeadDefs (LiveRange &LR, Register Reg)
	createDeadDefs - Create a dead def in LI for every def operand of Reg.
void	extendToUses (LiveRange &LR, MCRegister PhysReg)
	Extend the live range of LR to reach all uses of Reg.
void	calculate (LiveInterval &LI, bool TrackSubRegs)
	Calculates liveness for the register specified in live interval LI.
void	constructMainRangeFromSubranges (LiveInterval &LI)
	For live interval LI with correct SubRanges construct matching information for the main live range.
Public Member Functions inherited from llvm::LiveRangeCalc
	LiveRangeCalc ()=default
void	reset (const MachineFunction *mf, SlotIndexes *SI, MachineDominatorTree *MDT, VNInfo::Allocator *VNIA)
	reset - Prepare caches for a new set of non-overlapping live ranges.
void	extend (LiveRange &LR, SlotIndex Use, unsigned PhysReg, ArrayRef< SlotIndex > Undefs)
	Extend the live range of LR to reach Use.
void	setLiveOutValue (MachineBasicBlock *MBB, VNInfo *VNI)
	setLiveOutValue - Indicate that VNI is live out from MBB.
void	addLiveInBlock (LiveRange &LR, MachineDomTreeNode *DomNode, SlotIndex Kill=SlotIndex())
	addLiveInBlock - Add a block with an unknown live-in value.
void	calculateValues ()
	calculateValues - Calculate the value that will be live-in to each block added with addLiveInBlock.

Additional Inherited Members
Static Public Member Functions inherited from llvm::LiveRangeCalc
static LLVM_ATTRIBUTE_UNUSED bool	isJointlyDominated (const MachineBasicBlock *MBB, ArrayRef< SlotIndex > Defs, const SlotIndexes &Indexes)
	A diagnostic function to check if the end of the block MBB is jointly dominated by the blocks corresponding to the slot indices in Defs.
Protected Member Functions inherited from llvm::LiveRangeCalc
const MachineFunction *	getMachineFunction ()
	Some getters to expose in a read-only way some private fields to subclasses.
const MachineRegisterInfo *	getRegInfo () const
SlotIndexes *	getIndexes ()
MachineDominatorTree *	getDomTree ()
VNInfo::Allocator *	getVNAlloc ()
void	resetLiveOutMap ()
	Reset Map and Seen fields.

Detailed Description

Definition at line 28 of file LiveIntervalCalc.h.

Constructor & Destructor Documentation

LiveIntervalCalc()

llvm::LiveIntervalCalc::LiveIntervalCalc ( )

default

Member Function Documentation

calculate()

void LiveIntervalCalc::calculate	(	LiveInterval &	LI,
		bool	TrackSubRegs
	)

Calculates liveness for the register specified in live interval LI.

Creates subregister live ranges as needed if subreg liveness tracking is enabled.

Definition at line 42 of file LiveIntervalCalc.cpp.

References assert(), llvm::LiveRange::clear(), constructMainRangeFromSubranges(), createDeadDef(), llvm::LiveInterval::createSubRangeFrom(), llvm::LiveRange::empty(), llvm::LaneBitmask::getAll(), llvm::LiveRangeCalc::getDomTree(), llvm::LiveRangeCalc::getIndexes(), llvm::LiveRangeCalc::getMachineFunction(), llvm::LiveRangeCalc::getRegInfo(), llvm::LiveRangeCalc::getVNAlloc(), llvm::LiveInterval::hasSubRanges(), MRI, llvm::LiveInterval::refineSubRanges(), llvm::LiveInterval::reg(), llvm::LiveInterval::removeEmptySubRanges(), llvm::LiveRangeCalc::reset(), llvm::LiveRangeCalc::resetLiveOutMap(), llvm::LiveInterval::subranges(), SubReg, and TRI.

constructMainRangeFromSubranges()

void LiveIntervalCalc::constructMainRangeFromSubranges

(

LiveInterval &

LI

)

For live interval LI with correct SubRanges construct matching information for the main live range.

Expects the main live range to not have any segments or value numbers.

Definition at line 106 of file LiveIntervalCalc.cpp.

References assert(), llvm::LiveRange::createDeadDef(), llvm::VNInfo::def, llvm::SmallVectorBase< Size_T >::empty(), llvm::LaneBitmask::getAll(), llvm::LiveRangeCalc::getVNAlloc(), llvm::VNInfo::isPHIDef(), llvm::VNInfo::isUnused(), llvm::LiveInterval::reg(), llvm::LiveRangeCalc::resetLiveOutMap(), llvm::LiveRange::segments, llvm::LiveInterval::subranges(), and llvm::LiveRange::valnos.

Referenced by calculate().

createDeadDefs()

void LiveIntervalCalc::createDeadDefs	(	LiveRange &	LR,
		Register	Reg
	)

createDeadDefs - Create a dead def in LI for every def operand of Reg.

Each instruction defining Reg gets a new VNInfo with a corresponding minimal live range.

Definition at line 123 of file LiveIntervalCalc.cpp.

References assert(), createDeadDef(), llvm::LiveRangeCalc::getIndexes(), llvm::LiveRangeCalc::getRegInfo(), llvm::LiveRangeCalc::getVNAlloc(), and MRI.

extendToUses()

void llvm::LiveIntervalCalc::extendToUses ( LiveRange &  LR, MCRegister  PhysReg  )

inline

Extend the live range of LR to reach all uses of Reg.

All uses must be jointly dominated by existing liveness. PHI-defs are inserted as needed to preserve SSA form.

Definition at line 54 of file LiveIntervalCalc.h.

References llvm::LaneBitmask::getAll().

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

• include/llvm/CodeGen/LiveIntervalCalc.h
• lib/CodeGen/LiveIntervalCalc.cpp