RegisterScavenging.cpp File Reference

#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/STLExtras.h"

Include dependency graph for RegisterScavenging.cpp:

Go to the source code of this file.

Defines
#define	DEBUG_TYPE   "reg-scavenging"
Functions
static bool	RedefinesSuperRegPart (const MachineInstr *MI, unsigned SubReg, const TargetRegisterInfo *TRI)
static bool	RedefinesSuperRegPart (const MachineInstr *MI, const MachineOperand &MO, const TargetRegisterInfo *TRI)
static bool	isLiveInButUnusedBefore (unsigned Reg, MachineInstr *MI, MachineBasicBlock *MBB, const TargetRegisterInfo *TRI, MachineRegisterInfo *MRI)
static void	CreateRegClassMask (const TargetRegisterClass *RC, BitVector &Mask)

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Define Documentation

#define DEBUG_TYPE   "reg-scavenging"

Definition at line 17 of file RegisterScavenging.cpp.

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Function Documentation

static void CreateRegClassMask	(	const TargetRegisterClass *	RC,
		BitVector &	Mask
	)			[static]

CreateRegClassMask - Set the bits that represent the registers in the TargetRegisterClass.

Definition at line 350 of file RegisterScavenging.cpp.

References llvm::TargetRegisterClass::begin(), E, llvm::TargetRegisterClass::end(), I, and llvm::BitVector::set().

Referenced by llvm::RegScavenger::FindUnusedReg(), and llvm::RegScavenger::scavengeRegister().

static bool isLiveInButUnusedBefore	(	unsigned	Reg,
		MachineInstr *	MI,
		MachineBasicBlock *	MBB,
		const TargetRegisterInfo *	TRI,
		MachineRegisterInfo *	MRI
	)			[static]

isLiveInButUnusedBefore - Return true if register is livein the MBB not not used before it reaches the MI that defines register.

Definition at line 146 of file RegisterScavenging.cpp.

References llvm::MachineBasicBlock::begin(), llvm::SmallPtrSet< PtrType, SmallSize >::count(), E, llvm::SmallPtrSetImpl::empty(), llvm::MachineInstr::getParent(), I, llvm::SmallPtrSet< PtrType, SmallSize >::insert(), isLiveIn(), llvm::MachineBasicBlock::livein_begin(), llvm::MachineBasicBlock::livein_end(), MI, Reg, llvm::MachineRegisterInfo::use_begin(), and llvm::MachineRegisterInfo::use_end().

Referenced by llvm::RegScavenger::forward().

static bool RedefinesSuperRegPart	(	const MachineInstr *	MI,
		const MachineOperand &	MO,
		const TargetRegisterInfo *	TRI
	)			[static]

Definition at line 52 of file RegisterScavenging.cpp.

References llvm::MachineOperand::getReg(), llvm::MachineOperand::isDef(), llvm::MachineOperand::isReg(), and RedefinesSuperRegPart().

static bool RedefinesSuperRegPart	(	const MachineInstr *	MI,
		unsigned	SubReg,
		const TargetRegisterInfo *	TRI
	)			[static]

RedefinesSuperRegPart - Return true if the specified register is redefining part of a super-register.

Definition at line 33 of file RegisterScavenging.cpp.

References llvm::MachineInstr::getNumOperands(), llvm::MachineInstr::getOperand(), llvm::MachineOperand::getReg(), llvm::MachineOperand::isImplicit(), llvm::MachineOperand::isReg(), llvm::TargetRegisterInfo::isSuperRegister(), and llvm::MachineOperand::isUse().

Referenced by llvm::RegScavenger::forward(), RedefinesSuperRegPart(), and llvm::RegScavenger::setUnused().