XCoreFrameLowering.cpp File Reference

#include "XCoreFrameLowering.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/Function.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetOptions.h"
#include <algorithm>

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, 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.
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.
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.
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'.
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.

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 54 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 79 of file XCoreFrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), llvm::MCCFIInstruction::createOffset(), llvm::MachineBasicBlock::getParent(), MBB, MBBI, llvm::Offset, and TII.

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 68 of file XCoreFrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), llvm::MCCFIInstruction::cfiDefCfaOffset(), llvm::MachineBasicBlock::getParent(), MBB, MBBI, llvm::Offset, and TII.

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 58 of file XCoreFrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), llvm::MCCFIInstruction::createDefCfaRegister(), MBB, MBBI, and TII.

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 158 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, bool >::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 173 of file XCoreFrameLowering.cpp.

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

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 136 of file XCoreFrameLowering.cpp.

References CompareSSIOffset(), FramePtr, llvm::XCoreFunctionInfo::getFPSpillSlot(), llvm::XCoreFunctionInfo::getLRSpillSlot(), llvm::MachineFrameInfo::getObjectOffset(), llvm::Offset, llvm::SmallVectorTemplateBase< T, bool >::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 96 of file XCoreFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), assert(), llvm::BuildMI(), EmitDefCfaOffset(), isImmU6(), MaxImmU16, MBB, MBBI, and TII.

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 119 of file XCoreFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), assert(), llvm::BuildMI(), isImmU6(), MaxImmU16, MBB, MBBI, and TII.

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

isImmU16()

static bool isImmU16 ( unsigned  val )

inlinestatic

Definition at line 40 of file XCoreFrameLowering.cpp.

Referenced by llvm::XCoreFrameLowering::eliminateCallFramePseudoInstr(), llvm::XCoreRegisterInfo::eliminateFrameIndex(), and llvm::XCoreInstrInfo::loadImmediate().

isImmU6()

static bool isImmU6 ( unsigned  val )

inlinestatic

Definition at line 36 of file XCoreFrameLowering.cpp.

Referenced by llvm::XCoreFrameLowering::eliminateCallFramePseudoInstr(), llvm::XCoreFrameLowering::emitEpilogue(), llvm::XCoreFrameLowering::emitPrologue(), IfNeededExtSP(), IfNeededLDAWSP(), InsertSPImmInst(), llvm::XCoreInstrInfo::loadImmediate(), 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 188 of file XCoreFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addMemOperand(), assert(), llvm::BuildMI(), getFrameIndexMMO(), IfNeededLDAWSP(), isImmU6(), MBB, MBBI, llvm::MachineMemOperand::MOLoad, llvm::Offset, llvm::SmallVectorBase< Size_T >::size(), and TII.

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

Variable Documentation

FramePtr

const unsigned FramePtr = XCore::R10

static

Definition at line 32 of file XCoreFrameLowering.cpp.

Referenced by llvm::ARMFrameLowering::determineCalleeSaves(), llvm::X86FrameLowering::emitCalleeSavedFrameMoves(), llvm::X86FrameLowering::emitCalleeSavedFrameMovesFullCFA(), emitDefineCFAWithFP(), llvm::ARMFrameLowering::emitEpilogue(), llvm::Thumb1FrameLowering::emitEpilogue(), llvm::M68kFrameLowering::emitEpilogue(), llvm::X86FrameLowering::emitEpilogue(), llvm::XCoreFrameLowering::emitEpilogue(), llvm::ARMFrameLowering::emitPrologue(), llvm::Thumb1FrameLowering::emitPrologue(), llvm::M68kFrameLowering::emitPrologue(), llvm::X86FrameLowering::emitPrologue(), llvm::XCoreFrameLowering::emitPrologue(), GetSpillList(), insertSpills(), lowerAwaitSuspend(), lowerSubFn(), markCoroutineAsDone(), maybeFreeRetconStorage(), processCall(), replaceCoroEnd(), replaceFallthroughCoroEnd(), replaceFI(), replaceUnwindCoroEnd(), llvm::X86FrameLowering::restoreWin32EHStackPointers(), and llvm::coro::AsyncABI::splitCoroutine().

MaxImmU16

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

static

Definition at line 33 of file XCoreFrameLowering.cpp.

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