XCoreFrameLowering.cpp File Reference

#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/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetOptions.h"
#include <algorithm>

Include dependency graph for XCoreFrameLowering.cpp:

Go to the source code of this file.

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, DebugLoc dl, const TargetInstrInfo &TII, MachineModuleInfo *MMI, unsigned DRegNum)
static void	EmitDefCfaOffset (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, DebugLoc dl, const TargetInstrInfo &TII, MachineModuleInfo *MMI, int Offset)
static void	EmitCfiOffset (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, DebugLoc dl, const TargetInstrInfo &TII, MachineModuleInfo *MMI, unsigned DRegNum, int Offset)
static void	IfNeededExtSP (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, DebugLoc dl, const TargetInstrInfo &TII, MachineModuleInfo *MMI, int OffsetFromTop, int &Adjusted, int FrameSize, bool emitFrameMoves)
static void	IfNeededLDAWSP (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, DebugLoc dl, const TargetInstrInfo &TII, int OffsetFromTop, int &RemainingAdj)
static void	GetSpillList (SmallVectorImpl< StackSlotInfo > &SpillList, MachineFrameInfo *MFI, XCoreFunctionInfo *XFI, bool fetchLR, bool fetchFP)
static void	GetEHSpillList (SmallVectorImpl< StackSlotInfo > &SpillList, MachineFrameInfo *MFI, XCoreFunctionInfo *XFI, const TargetLowering *TL)
static MachineMemOperand *	getFrameIndexMMO (MachineBasicBlock &MBB, int FrameIndex, unsigned flags)
static void	RestoreSpillList (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, DebugLoc dl, const TargetInstrInfo &TII, int &RemainingAdj, SmallVectorImpl< StackSlotInfo > &SpillList)
Variables
static const unsigned	FramePtr = XCore::R10
static const int	MaxImmU16 = (1<<16) - 1

---

Function Documentation

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

Definition at line 57 of file XCoreFrameLowering.cpp.

Referenced by GetEHSpillList(), and GetSpillList().

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

Definition at line 82 of file XCoreFrameLowering.cpp.

References llvm::MachineModuleInfo::addFrameInst(), llvm::BuildMI(), llvm::TargetOpcode::CFI_INSTRUCTION, llvm::MCCFIInstruction::createOffset(), and llvm::MCInstrInfo::get().

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

static void EmitDefCfaOffset	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		DebugLoc	dl,
		const TargetInstrInfo &	TII,
		MachineModuleInfo *	MMI,
		int	Offset
	)		[static]

Definition at line 72 of file XCoreFrameLowering.cpp.

References llvm::MachineModuleInfo::addFrameInst(), llvm::BuildMI(), llvm::TargetOpcode::CFI_INSTRUCTION, llvm::MCCFIInstruction::createDefCfaOffset(), and llvm::MCInstrInfo::get().

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

static void EmitDefCfaRegister	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		DebugLoc	dl,
		const TargetInstrInfo &	TII,
		MachineModuleInfo *	MMI,
		unsigned	DRegNum
	)		[static]

Definition at line 62 of file XCoreFrameLowering.cpp.

References llvm::MachineModuleInfo::addFrameInst(), llvm::BuildMI(), llvm::TargetOpcode::CFI_INSTRUCTION, llvm::MCCFIInstruction::createDefCfaRegister(), and llvm::MCInstrInfo::get().

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

static void GetEHSpillList	(	SmallVectorImpl< StackSlotInfo > &	SpillList,
		MachineFrameInfo *	MFI,
		XCoreFunctionInfo *	XFI,
		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 llvm::SmallVectorTemplateCommon< T >::begin(), CompareSSIOffset(), llvm::SmallVectorTemplateCommon< T >::end(), llvm::XCoreFunctionInfo::getEHSpillSlot(), llvm::TargetLoweringBase::getExceptionPointerRegister(), llvm::TargetLoweringBase::getExceptionSelectorRegister(), llvm::MachineFrameInfo::getObjectOffset(), llvm::XCoreFunctionInfo::hasEHSpillSlot(), and llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back().

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

static MachineMemOperand* getFrameIndexMMO	(	MachineBasicBlock &	MBB,
		int	FrameIndex,
		unsigned	flags
	)		[static]

Definition at line 177 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().

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 llvm::SmallVectorTemplateCommon< T >::begin(), CompareSSIOffset(), llvm::SmallVectorTemplateCommon< T >::end(), FramePtr, llvm::XCoreFunctionInfo::getFPSpillSlot(), llvm::XCoreFunctionInfo::getLRSpillSlot(), llvm::MachineFrameInfo::getObjectOffset(), and llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back().

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

static void IfNeededExtSP	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		DebugLoc	dl,
		const TargetInstrInfo &	TII,
		MachineModuleInfo *	MMI,
		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 98 of file XCoreFrameLowering.cpp.

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

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

static void IfNeededLDAWSP	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		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 llvm::BuildMI(), llvm::MCInstrInfo::get(), isImmU6(), and MaxImmU16.

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

static bool isImmU16

(

unsigned

val

)

[inline, static]

Definition at line 43 of file XCoreFrameLowering.cpp.

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

static bool isImmU6

(

unsigned

val

)

[inline, static]

Definition at line 39 of file XCoreFrameLowering.cpp.

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

static void RestoreSpillList	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		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 192 of file XCoreFrameLowering.cpp.

References llvm::MachineInstrBuilder::addMemOperand(), llvm::BuildMI(), llvm::MCInstrInfo::get(), getFrameIndexMMO(), IfNeededLDAWSP(), isImmU6(), llvm::MachineMemOperand::MOLoad, and llvm::SmallVectorTemplateCommon< T >::size().

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

---

Variable Documentation

const unsigned FramePtr = XCore::R10 [static]

Definition at line 35 of file XCoreFrameLowering.cpp.

Referenced by llvm::SparcRegisterInfo::eliminateFrameIndex(), llvm::Thumb1FrameLowering::emitEpilogue(), llvm::ARMFrameLowering::emitEpilogue(), llvm::XCoreFrameLowering::emitEpilogue(), llvm::X86FrameLowering::emitEpilogue(), llvm::XCoreFrameLowering::emitPrologue(), llvm::Thumb1FrameLowering::emitPrologue(), llvm::ARMFrameLowering::emitPrologue(), llvm::AArch64FrameLowering::emitPrologue(), llvm::X86FrameLowering::emitPrologue(), GetSpillList(), and llvm::ARMFrameLowering::processFunctionBeforeCalleeSavedScan().

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

Definition at line 36 of file XCoreFrameLowering.cpp.

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