#include "XCoreFrameLowering.h"
#include "XCore.h"
#include "XCoreInstrInfo.h"
#include "XCoreMachineFunctionInfo.h"
#include "XCoreSubtarget.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetOptions.h"
#include <algorithm>

Include dependency graph for XCoreFrameLowering.cpp:

Functions
static bool	isImmU6 (unsigned val)

static bool	isImmU16 (unsigned val)

static bool	CompareSSIOffset (const StackSlotInfo &a, const StackSlotInfo &b)

static void	EmitDefCfaRegister (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &dl, const TargetInstrInfo &TII, MachineFunction &MF, unsigned DRegNum)

static void	EmitDefCfaOffset (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &dl, const TargetInstrInfo &TII, int Offset)

static void	EmitCfiOffset (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &dl, const TargetInstrInfo &TII, unsigned DRegNum, int Offset)

static void	IfNeededExtSP (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &dl, const TargetInstrInfo &TII, int OffsetFromTop, int &Adjusted, int FrameSize, bool emitFrameMoves)
	The SP register is moved in steps of 'MaxImmU16' towards the bottom of the frame. More...

static void	IfNeededLDAWSP (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &dl, const TargetInstrInfo &TII, int OffsetFromTop, int &RemainingAdj)
	The SP register is moved in steps of 'MaxImmU16' towards the top of the frame. More...

static void	GetSpillList (SmallVectorImpl< StackSlotInfo > &SpillList, MachineFrameInfo &MFI, XCoreFunctionInfo *XFI, bool fetchLR, bool fetchFP)
	Creates an ordered list of registers that are spilled during the emitPrologue/emitEpilogue. More...

static void	GetEHSpillList (SmallVectorImpl< StackSlotInfo > &SpillList, MachineFrameInfo &MFI, XCoreFunctionInfo XFI, const Constant PersonalityFn, const TargetLowering *TL)
	Creates an ordered list of EH info register 'spills'. More...

static MachineMemOperand *	getFrameIndexMMO (MachineBasicBlock &MBB, int FrameIndex, MachineMemOperand::Flags flags)

static void	RestoreSpillList (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &dl, const TargetInstrInfo &TII, int &RemainingAdj, SmallVectorImpl< StackSlotInfo > &SpillList)
	Restore clobbered registers with their spill slot value. More...

Variables
static const unsigned	FramePtr = XCore::R10

static const int	MaxImmU16 = (1<<16) - 1

Function Documentation

◆ CompareSSIOffset()

static bool CompareSSIOffset	(	const StackSlotInfo &	a,
		const StackSlotInfo &	b
	)

static

Definition at line 57 of file XCoreFrameLowering.cpp.

Referenced by GetEHSpillList(), and GetSpillList().

◆ EmitCfiOffset()

static void EmitCfiOffset	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		const DebugLoc &	dl,
		const TargetInstrInfo &	TII,
		unsigned	DRegNum,
		int	Offset
	)

static

Definition at line 82 of file XCoreFrameLowering.cpp.

References llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), llvm::MCCFIInstruction::createOffset(), llvm::MCInstrInfo::get(), and llvm::MachineBasicBlock::getParent().

Referenced by llvm::XCoreFrameLowering::emitPrologue().

◆ EmitDefCfaOffset()

static void EmitDefCfaOffset	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		const DebugLoc &	dl,
		const TargetInstrInfo &	TII,
		int	Offset
	)

static

Definition at line 71 of file XCoreFrameLowering.cpp.

References llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), llvm::MCCFIInstruction::createDefCfaOffset(), llvm::MCInstrInfo::get(), and llvm::MachineBasicBlock::getParent().

Referenced by llvm::XCoreFrameLowering::emitPrologue(), and IfNeededExtSP().

◆ EmitDefCfaRegister()

static void EmitDefCfaRegister	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		const DebugLoc &	dl,
		const TargetInstrInfo &	TII,
		MachineFunction &	MF,
		unsigned	DRegNum
	)

static

Definition at line 61 of file XCoreFrameLowering.cpp.

References llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), llvm::MCCFIInstruction::createDefCfaRegister(), and llvm::MCInstrInfo::get().

Referenced by llvm::XCoreFrameLowering::emitPrologue().

◆ GetEHSpillList()

static void GetEHSpillList	(	SmallVectorImpl< StackSlotInfo > &	SpillList,
		MachineFrameInfo &	MFI,
		XCoreFunctionInfo *	XFI,
		const Constant *	PersonalityFn,
		const TargetLowering *	TL
	)

static

Creates an ordered list of EH info register 'spills'.

These slots are only used by the unwinder and calls to llvm.eh.return(). Registers are ordered according to their frame offset. As offsets are negative, the largest offsets will be first.

Definition at line 161 of file XCoreFrameLowering.cpp.

References assert(), CompareSSIOffset(), llvm::XCoreFunctionInfo::getEHSpillSlot(), llvm::TargetLoweringBase::getExceptionPointerRegister(), llvm::TargetLoweringBase::getExceptionSelectorRegister(), llvm::MachineFrameInfo::getObjectOffset(), llvm::XCoreFunctionInfo::hasEHSpillSlot(), llvm::SmallVectorTemplateBase< T >::push_back(), and llvm::sort().

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

◆ getFrameIndexMMO()

static MachineMemOperand* getFrameIndexMMO	(	MachineBasicBlock &	MBB,
		int	FrameIndex,
		MachineMemOperand::Flags	flags
	)

static

Definition at line 176 of file XCoreFrameLowering.cpp.

References llvm::MachinePointerInfo::getFixedStack(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getMachineMemOperand(), llvm::MachineFrameInfo::getObjectAlignment(), llvm::MachineFrameInfo::getObjectSize(), and llvm::MachineBasicBlock::getParent().

Referenced by llvm::XCoreFrameLowering::emitPrologue(), and RestoreSpillList().

◆ GetSpillList()

static void GetSpillList	(	SmallVectorImpl< StackSlotInfo > &	SpillList,
		MachineFrameInfo &	MFI,
		XCoreFunctionInfo *	XFI,
		bool	fetchLR,
		bool	fetchFP
	)

static

Creates an ordered list of registers that are spilled during the emitPrologue/emitEpilogue.

Registers are ordered according to their frame offset. As offsets are negative, the largest offsets will be first.

Definition at line 139 of file XCoreFrameLowering.cpp.

References CompareSSIOffset(), llvm::XCoreFunctionInfo::getFPSpillSlot(), llvm::XCoreFunctionInfo::getLRSpillSlot(), llvm::MachineFrameInfo::getObjectOffset(), llvm::SmallVectorTemplateBase< T >::push_back(), and llvm::sort().

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

◆ IfNeededExtSP()

static void IfNeededExtSP	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		const DebugLoc &	dl,
		const TargetInstrInfo &	TII,
		int	OffsetFromTop,
		int &	Adjusted,
		int	FrameSize,
		bool	emitFrameMoves
	)

static

The SP register is moved in steps of 'MaxImmU16' towards the bottom of the frame.

During these steps, it may be necessary to spill registers. IfNeededExtSP emits the necessary EXTSP instructions to move the SP only as far as to make 'OffsetFromBottom' reachable using an STWSP_lru6.

Parameters

	OffsetFromTop	the spill offset from the top of the frame.
[in,out]	Adjusted	the current SP offset from the top of the frame.

Definition at line 99 of file XCoreFrameLowering.cpp.

References assert(), llvm::BuildMI(), EmitDefCfaOffset(), llvm::MCInstrInfo::get(), isImmU6(), and MaxImmU16.

Referenced by llvm::XCoreFrameLowering::emitPrologue().

◆ IfNeededLDAWSP()

static void IfNeededLDAWSP	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		const DebugLoc &	dl,
		const TargetInstrInfo &	TII,
		int	OffsetFromTop,
		int &	RemainingAdj
	)

static

The SP register is moved in steps of 'MaxImmU16' towards the top of the frame.

During these steps, it may be necessary to re-load registers. IfNeededLDAWSP emits the necessary LDAWSP instructions to move the SP only as far as to make 'OffsetFromTop' reachable using an LDAWSP_lru6.

Parameters

	OffsetFromTop	the spill offset from the top of the frame.
[in,out]	RemainingAdj	the current SP offset from the top of the frame.

Definition at line 122 of file XCoreFrameLowering.cpp.

References assert(), llvm::BuildMI(), llvm::MCInstrInfo::get(), isImmU6(), and MaxImmU16.

Referenced by llvm::XCoreFrameLowering::emitEpilogue(), and RestoreSpillList().

◆ isImmU16()

static bool isImmU16 ( unsigned val )

inlinestatic

Definition at line 43 of file XCoreFrameLowering.cpp.

References Reg.

Referenced by llvm::XCoreFrameLowering::eliminateCallFramePseudoInstr().

◆ isImmU6()

static bool isImmU6 ( unsigned val )

inlinestatic

Definition at line 39 of file XCoreFrameLowering.cpp.

Referenced by llvm::XCoreFrameLowering::eliminateCallFramePseudoInstr(), llvm::XCoreFrameLowering::emitEpilogue(), llvm::XCoreFrameLowering::emitPrologue(), IfNeededExtSP(), IfNeededLDAWSP(), and RestoreSpillList().

◆ RestoreSpillList()

static void RestoreSpillList	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		const DebugLoc &	dl,
		const TargetInstrInfo &	TII,
		int &	RemainingAdj,
		SmallVectorImpl< StackSlotInfo > &	SpillList
	)

static

Restore clobbered registers with their spill slot value.

The SP will be adjusted at the same time, thus the SpillList must be ordered with the largest (negative) offsets first.

Definition at line 191 of file XCoreFrameLowering.cpp.

References llvm::MachineInstrBuilder::addMemOperand(), assert(), llvm::BuildMI(), llvm::MCInstrInfo::get(), getFrameIndexMMO(), IfNeededLDAWSP(), isImmU6(), llvm::MachineMemOperand::MOLoad, and llvm::SmallVectorBase::size().

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

Variable Documentation

◆ FramePtr

const unsigned FramePtr = XCore::R10

static

Definition at line 35 of file XCoreFrameLowering.cpp.

Referenced by llvm::CodeViewDebug::beginFunctionImpl(), llvm::ARMAsmPrinter::EmitInstruction(), and llvm::ARMAsmPrinter::EmitJumpTableTBInst().

◆ MaxImmU16

const int MaxImmU16 = (1<<16) - 1

static

Definition at line 36 of file XCoreFrameLowering.cpp.

Referenced by llvm::XCoreFrameLowering::emitPrologue(), IfNeededExtSP(), and IfNeededLDAWSP().

Functions

Variables

Function Documentation

◆ CompareSSIOffset()

◆ EmitCfiOffset()

◆ EmitDefCfaOffset()

◆ EmitDefCfaRegister()

◆ GetEHSpillList()

◆ getFrameIndexMMO()

◆ GetSpillList()

◆ IfNeededExtSP()

◆ IfNeededLDAWSP()

◆ isImmU16()

◆ isImmU6()

◆ RestoreSpillList()

Variable Documentation

◆ FramePtr

◆ MaxImmU16