ARMRegisterInfo.cpp File Reference

#include "ARM.h"
#include "ARMAddressingModes.h"
#include "ARMInstrInfo.h"
#include "ARMMachineFunctionInfo.h"
#include "ARMRegisterInfo.h"
#include "ARMSubtarget.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/CommandLine.h"
#include <algorithm>
#include "ARMGenRegisterInfo.inc"

Include dependency graph for ARMRegisterInfo.cpp:

Go to the source code of this file.

Functions
static const MachineInstrBuilder &	AddDefaultPred (const MachineInstrBuilder &MIB)
static const MachineInstrBuilder &	AddDefaultCC (const MachineInstrBuilder &MIB)
static void	emitARMRegPlusImmediate (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, unsigned DestReg, unsigned BaseReg, int NumBytes, ARMCC::CondCodes Pred, unsigned PredReg, const TargetInstrInfo &TII)
static unsigned	calcNumMI (int Opc, int ExtraOpc, unsigned Bytes, unsigned NumBits, unsigned Scale)
static void	emitThumbRegPlusImmInReg (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, unsigned DestReg, unsigned BaseReg, int NumBytes, bool CanChangeCC, const TargetInstrInfo &TII, const ARMRegisterInfo &MRI)
static void	emitThumbRegPlusImmediate (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, unsigned DestReg, unsigned BaseReg, int NumBytes, const TargetInstrInfo &TII, const ARMRegisterInfo &MRI)
static void	emitSPUpdate (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, int NumBytes, ARMCC::CondCodes Pred, unsigned PredReg, bool isThumb, const TargetInstrInfo &TII, const ARMRegisterInfo &MRI)
static void	emitThumbConstant (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, unsigned DestReg, int Imm, const TargetInstrInfo &TII, const ARMRegisterInfo &MRI)
static unsigned	findScratchRegister (RegScavenger *RS, const TargetRegisterClass *RC, ARMFunctionInfo *AFI)
static unsigned	estimateStackSize (MachineFunction &MF, MachineFrameInfo *MFI)
static void	movePastCSLoadStoreOps (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, int Opc, unsigned Area, const ARMSubtarget &STI)
static bool	isCalleeSavedRegister (unsigned Reg, const unsigned *CSRegs)
static bool	isCSRestore (MachineInstr *MI, const unsigned *CSRegs)
Variables
static cl::opt< bool >	ThumbRegScavenging ("enable-thumb-reg-scavenging", cl::Hidden, cl::desc("Enable register scavenging on Thumb"))

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Function Documentation

static const MachineInstrBuilder& AddDefaultCC

(

const MachineInstrBuilder &

MIB

)

[inline, static]

Definition at line 171 of file ARMRegisterInfo.cpp.

References llvm::MachineInstrBuilder::addReg().

static const MachineInstrBuilder& AddDefaultPred

(

const MachineInstrBuilder &

MIB

)

[inline, static]

Definition at line 166 of file ARMRegisterInfo.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), and llvm::ARMCC::AL.

static unsigned calcNumMI	(	int	Opc,
		int	ExtraOpc,
		unsigned	Bytes,
		unsigned	NumBits,
		unsigned	Scale
	)			[static]

calcNumMI - Returns the number of instructions required to materialize the specific add / sub r, c instruction.

Definition at line 346 of file ARMRegisterInfo.cpp.

Referenced by llvm::ARMRegisterInfo::eliminateFrameIndex(), and emitThumbRegPlusImmediate().

static void emitARMRegPlusImmediate	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator &	MBBI,
		unsigned	DestReg,
		unsigned	BaseReg,
		int	NumBytes,
		ARMCC::CondCodes	Pred,
		unsigned	PredReg,
		const TargetInstrInfo &	TII
	)			[static]

emitARMRegPlusImmediate - Emits a series of instructions to materialize a destreg = basereg + immediate in ARM code.

Definition at line 316 of file ARMRegisterInfo.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::TargetInstrInfo::get(), llvm::ARM_AM::getSOImmVal(), llvm::ARM_AM::getSOImmValRotate(), and llvm::ARM_AM::rotr32().

Referenced by llvm::ARMRegisterInfo::eliminateFrameIndex(), and emitSPUpdate().

static void emitSPUpdate	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator &	MBBI,
		int	NumBytes,
		ARMCC::CondCodes	Pred,
		unsigned	PredReg,
		bool	isThumb,
		const TargetInstrInfo &	TII,
		const ARMRegisterInfo &	MRI
	)			[static]

Definition at line 525 of file ARMRegisterInfo.cpp.

References emitARMRegPlusImmediate(), and emitThumbRegPlusImmediate().

Referenced by llvm::ARMRegisterInfo::eliminateCallFramePseudoInstr(), llvm::X86RegisterInfo::emitEpilogue(), llvm::ARMRegisterInfo::emitEpilogue(), llvm::X86RegisterInfo::emitPrologue(), and llvm::ARMRegisterInfo::emitPrologue().

static void emitThumbConstant	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator &	MBBI,
		unsigned	DestReg,
		int	Imm,
		const TargetInstrInfo &	TII,
		const ARMRegisterInfo &	MRI
	)			[static]

emitThumbConstant - Emit a series of instructions to materialize a constant.

Definition at line 575 of file ARMRegisterInfo.cpp.

References llvm::BuildMI(), emitThumbRegPlusImmediate(), and llvm::TargetInstrInfo::get().

Referenced by llvm::ARMRegisterInfo::eliminateFrameIndex().

static void emitThumbRegPlusImmediate	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator &	MBBI,
		unsigned	DestReg,
		unsigned	BaseReg,
		int	NumBytes,
		const TargetInstrInfo &	TII,
		const ARMRegisterInfo &	MRI
	)			[static]

emitThumbRegPlusImmediate - Emits a series of instructions to materialize a destreg = basereg + immediate in Thumb code.

Definition at line 422 of file ARMRegisterInfo.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::BuildMI(), calcNumMI(), emitThumbRegPlusImmInReg(), llvm::TargetInstrInfo::get(), llvm::ARMRegisterInfo::isLowRegister(), Scale, and Threshold.

Referenced by llvm::ARMRegisterInfo::eliminateFrameIndex(), llvm::ARMRegisterInfo::emitEpilogue(), emitSPUpdate(), and emitThumbConstant().

static void emitThumbRegPlusImmInReg	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator &	MBBI,
		unsigned	DestReg,
		unsigned	BaseReg,
		int	NumBytes,
		bool	CanChangeCC,
		const TargetInstrInfo &	TII,
		const ARMRegisterInfo &	MRI
	)			[static]

emitThumbRegPlusImmInReg - Emits a series of instructions to materialize a destreg = basereg + immediate in Thumb code. Materialize the immediate in a register using mov / mvn sequences or load the immediate from a constpool entry.

Definition at line 373 of file ARMRegisterInfo.cpp.

References llvm::MachineInstrBuilder::addReg(), llvm::ARMCC::AL, llvm::BuildMI(), llvm::ARMRegisterInfo::emitLoadConstPool(), llvm::TargetInstrInfo::get(), and llvm::ARMRegisterInfo::isLowRegister().

Referenced by llvm::ARMRegisterInfo::eliminateFrameIndex(), and emitThumbRegPlusImmediate().

static unsigned estimateStackSize	(	MachineFunction &	MF,
		MachineFrameInfo *	MFI
	)			[static]

Definition at line 923 of file ARMRegisterInfo.cpp.

References Align, llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getObjectAlignment(), llvm::MachineFrameInfo::getObjectIndexBegin(), llvm::MachineFrameInfo::getObjectIndexEnd(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineFrameInfo::getObjectSize(), llvm::MachineFrameInfo::isDeadObjectIndex(), and Offset.

Referenced by llvm::ARMRegisterInfo::processFunctionBeforeCalleeSavedScan().

static unsigned findScratchRegister	(	RegScavenger *	RS,
		const TargetRegisterClass *	RC,
		ARMFunctionInfo *	AFI
	)			[static]

findScratchRegister - Find a 'free' ARM register. If register scavenger is not being used, R12 is available. Otherwise, try for a call-clobbered register first and then a spilled callee-saved register if that fails.

Definition at line 598 of file ARMRegisterInfo.cpp.

References llvm::RegScavenger::FindUnusedReg(), llvm::ARMFunctionInfo::getSpilledCSRegisters(), and Reg.

Referenced by llvm::PPCRegisterInfo::eliminateFrameIndex(), llvm::ARMRegisterInfo::eliminateFrameIndex(), llvm::PPCRegisterInfo::lowerCRSpilling(), and llvm::PPCRegisterInfo::lowerDynamicAlloc().

static bool isCalleeSavedRegister	(	unsigned	Reg,
		const unsigned *	CSRegs
	)			[static]

Definition at line 1316 of file ARMRegisterInfo.cpp.

Referenced by isCSRestore().

static bool isCSRestore	(	MachineInstr *	MI,
		const unsigned *	CSRegs
	)			[static]

Definition at line 1323 of file ARMRegisterInfo.cpp.

References llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), llvm::MachineOperand::getReg(), isCalleeSavedRegister(), and llvm::MachineOperand::isFI().

Referenced by llvm::ARMRegisterInfo::emitEpilogue().

static void movePastCSLoadStoreOps	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator &	MBBI,
		int	Opc,
		unsigned	Area,
		const ARMSubtarget &	STI
	)			[static]

Move iterator pass the next bunch of callee save load / store ops for the particular spill area (1: integer area 1, 2: integer area 2, 3: fp area, 0: don't care).

Definition at line 1158 of file ARMRegisterInfo.cpp.

References llvm::X86II::D8, llvm::X86II::D9, llvm::MachineBasicBlock::end(), and llvm::ARMSubtarget::isTargetDarwin().

Referenced by llvm::ARMRegisterInfo::emitEpilogue(), and llvm::ARMRegisterInfo::emitPrologue().

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Variable Documentation

cl::opt<bool> ThumbRegScavenging("enable-thumb-reg-scavenging", cl::Hidden, cl::desc("Enable register scavenging on Thumb")) [static]

Referenced by llvm::ARMRegisterInfo::requiresRegisterScavenging().