AArch64FrameLowering.cpp File Reference

#include "AArch64FrameLowering.h"
#include "AArch64InstrInfo.h"
#include "AArch64MachineFunctionInfo.h"
#include "AArch64RegisterInfo.h"
#include "AArch64Subtarget.h"
#include "AArch64TargetMachine.h"
#include "MCTargetDesc/AArch64AddressingModes.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/LivePhysRegs.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/CodeGen/WinEHFuncInfo.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/Function.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include <cassert>
#include <cstdint>
#include <iterator>
#include <vector>

Include dependency graph for AArch64FrameLowering.cpp:

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "frame-info"

Functions
	STATISTIC (NumRedZoneFunctions, "Number of functions using red zone")
static int64_t	getArgumentStackToRestore (MachineFunction &MF, MachineBasicBlock &MBB)
	Returns how much of the incoming argument stack area (in bytes) we should clean up in an epilogue. More...
static bool	produceCompactUnwindFrame (MachineFunction &MF)
static bool	needsWinCFI (const MachineFunction &MF)
static StackOffset	getSVEStackSize (const MachineFunction &MF)
	Returns the size of the entire SVE stackframe (calleesaves + spills). More...
static unsigned	estimateRSStackSizeLimit (MachineFunction &MF)
	Look at each instruction that references stack frames and return the stack size limit beyond which some of these instructions will require a scratch register during their expansion later. More...
static unsigned	getFixedObjectSize (const MachineFunction &MF, const AArch64FunctionInfo *AFI, bool IsWin64, bool IsFunclet)
	Returns the size of the fixed object area (allocated next to sp on entry) On Win64 this may include a var args area and an UnwindHelp object for EH. More...
static void	appendVGScaledOffsetExpr (SmallVectorImpl< char > &Expr, int NumBytes, int NumVGScaledBytes, unsigned VG, llvm::raw_string_ostream &Comment)
static unsigned	findScratchNonCalleeSaveRegister (MachineBasicBlock *MBB)
static bool	windowsRequiresStackProbe (MachineFunction &MF, uint64_t StackSizeInBytes)
static MachineBasicBlock::iterator	InsertSEH (MachineBasicBlock::iterator MBBI, const TargetInstrInfo &TII, MachineInstr::MIFlag Flag)
static void	fixupSEHOpcode (MachineBasicBlock::iterator MBBI, unsigned LocalStackSize)
static MachineBasicBlock::iterator	convertCalleeSaveRestoreToSPPrePostIncDec (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &DL, const TargetInstrInfo *TII, int CSStackSizeInc, bool NeedsWinCFI, bool *HasWinCFI, bool InProlog=true)
static void	fixupCalleeSaveRestoreStackOffset (MachineInstr &MI, uint64_t LocalStackSize, bool NeedsWinCFI, bool *HasWinCFI)
static void	adaptForLdStOpt (MachineBasicBlock &MBB, MachineBasicBlock::iterator FirstSPPopI, MachineBasicBlock::iterator LastPopI)
static bool	isTargetWindows (const MachineFunction &MF)
static bool	IsSVECalleeSave (MachineBasicBlock::iterator I)
static void	InsertReturnAddressAuth (MachineFunction &MF, MachineBasicBlock &MBB)
static bool	isFuncletReturnInstr (const MachineInstr &MI)
static StackOffset	getFPOffset (const MachineFunction &MF, int64_t ObjectOffset)
static StackOffset	getStackOffset (const MachineFunction &MF, int64_t ObjectOffset)
static unsigned	getPrologueDeath (MachineFunction &MF, unsigned Reg)
static bool	invalidateWindowsRegisterPairing (unsigned Reg1, unsigned Reg2, bool NeedsWinCFI, bool IsFirst)
static bool	invalidateRegisterPairing (unsigned Reg1, unsigned Reg2, bool UsesWinAAPCS, bool NeedsWinCFI, bool NeedsFrameRecord, bool IsFirst)
	Returns true if Reg1 and Reg2 cannot be paired using a ldp/stp instruction. More...
static void	computeCalleeSaveRegisterPairs (MachineFunction &MF, ArrayRef< CalleeSavedInfo > CSI, const TargetRegisterInfo *TRI, SmallVectorImpl< RegPairInfo > &RegPairs, bool &NeedShadowCallStackProlog, bool NeedsFrameRecord)
static bool	getSVECalleeSaveSlotRange (const MachineFrameInfo &MFI, int &Min, int &Max)
	returns true if there are any SVE callee saves. More...
static int64_t	determineSVEStackObjectOffsets (MachineFrameInfo &MFI, int &MinCSFrameIndex, int &MaxCSFrameIndex, bool AssignOffsets)

Variables
static cl::opt< bool >	EnableRedZone ("aarch64-redzone", cl::desc("enable use of redzone on AArch64"), cl::init(false), cl::Hidden)
static cl::opt< bool >	ReverseCSRRestoreSeq ("reverse-csr-restore-seq", cl::desc("reverse the CSR restore sequence"), cl::init(false), cl::Hidden)
static cl::opt< bool >	StackTaggingMergeSetTag ("stack-tagging-merge-settag", cl::desc("merge settag instruction in function epilog"), cl::init(true), cl::Hidden)
static cl::opt< bool >	OrderFrameObjects ("aarch64-order-frame-objects", cl::desc("sort stack allocations"), cl::init(true), cl::Hidden)
cl::opt< bool >	EnableHomogeneousPrologEpilog ("homogeneous-prolog-epilog", cl::init(false), cl::ZeroOrMore, cl::Hidden, cl::desc("Emit homogeneous prologue and epilogue for the size " "optimization (default = off)"))
static const unsigned	DefaultSafeSPDisplacement = 255
	This is the biggest offset to the stack pointer we can encode in aarch64 instructions (without using a separate calculation and a temp register). More...

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "frame-info"

Definition at line 169 of file AArch64FrameLowering.cpp.

Function Documentation

adaptForLdStOpt()

static void adaptForLdStOpt ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  FirstSPPopI, MachineBasicBlock::iterator  LastPopI  )

static

Definition at line 1052 of file AArch64FrameLowering.cpp.

References MBB, ReverseCSRRestoreSeq, and llvm::MachineBasicBlock::splice().

Referenced by llvm::AArch64FrameLowering::emitEpilogue().

appendVGScaledOffsetExpr()

static void appendVGScaledOffsetExpr ( SmallVectorImpl< char > &  Expr, int  NumBytes, int  NumVGScaledBytes, unsigned  VG, llvm::raw_string_ostream &  Comment  )

static

Definition at line 445 of file AArch64FrameLowering.cpp.

References llvm::abs(), llvm::SmallVectorImpl< T >::append(), llvm::encodeSLEB128(), and llvm::encodeULEB128().

computeCalleeSaveRegisterPairs()

static void computeCalleeSaveRegisterPairs ( MachineFunction &  MF, ArrayRef< CalleeSavedInfo >  CSI, const TargetRegisterInfo *  TRI, SmallVectorImpl< RegPairInfo > &  RegPairs, bool &  NeedShadowCallStackProlog, bool  NeedsFrameRecord  )

static

Definition at line 2277 of file AArch64FrameLowering.cpp.

References Align, assert(), contains(), llvm::ArrayRef< T >::empty(), llvm::AArch64FunctionInfo::getCalleeSavedStackSize(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getSubtarget(), llvm::AArch64FunctionInfo::getSVECalleeSavedStackSize(), llvm::AArch64FunctionInfo::hasCalleeSaveStackFreeSpace(), llvm::Function::hasFnAttribute(), llvm::AArch64FunctionInfo::hasSwiftAsyncContext(), i, invalidateRegisterPairing(), invalidateWindowsRegisterPairing(), isTargetWindows(), llvm::AArch64Subtarget::isXRegisterReserved(), llvm_unreachable, needsWinCFI(), Offset, llvm::CallingConv::PreserveMost, produceCompactUnwindFrame(), llvm::report_fatal_error(), llvm::reverse(), llvm::NVPTX::PTXCvtMode::RPI, llvm::AArch64FunctionInfo::setCalleeSaveBaseToFrameRecordOffset(), and llvm::ArrayRef< T >::size().

Referenced by llvm::AArch64FrameLowering::restoreCalleeSavedRegisters(), and llvm::AArch64FrameLowering::spillCalleeSavedRegisters().

convertCalleeSaveRestoreToSPPrePostIncDec()

static MachineBasicBlock::iterator convertCalleeSaveRestoreToSPPrePostIncDec ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI, const DebugLoc &  DL, const TargetInstrInfo *  TII, int  CSStackSizeInc, bool  NeedsWinCFI, bool *  HasWinCFI, bool  InProlog = true  )

static

Definition at line 881 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::add(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), assert(), llvm::BuildMI(), llvm::RegState::Define, DL, llvm::emitFrameOffset(), llvm::MachineBasicBlock::erase(), llvm::TypeSize::Fixed(), llvm::MachineInstr::FrameDestroy, llvm::MachineInstr::FrameSetup, llvm::StackOffset::getFixed(), InsertSEH(), llvm::AArch64InstrInfo::isSEHInstruction(), llvm_unreachable, MBB, MBBI, llvm::MachineInstrBuilder::setMemRefs(), llvm::MachineInstrBuilder::setMIFlags(), Success, and TII.

Referenced by llvm::AArch64FrameLowering::emitEpilogue(), and llvm::AArch64FrameLowering::emitPrologue().

determineSVEStackObjectOffsets()

static int64_t determineSVEStackObjectOffsets ( MachineFrameInfo &  MFI, int &  MinCSFrameIndex, int &  MaxCSFrameIndex, bool  AssignOffsets  )

static

Definition at line 3009 of file AArch64FrameLowering.cpp.

References Align, llvm::alignTo(), assert(), llvm::dbgs(), E, llvm::MachineFrameInfo::getObjectAlign(), llvm::MachineFrameInfo::getObjectIndexBegin(), llvm::MachineFrameInfo::getObjectIndexEnd(), llvm::MachineFrameInfo::getObjectSize(), llvm::MachineFrameInfo::getStackID(), getSVECalleeSaveSlotRange(), I, llvm::MachineFrameInfo::isDeadObjectIndex(), LLVM_DEBUG, Offset, llvm::report_fatal_error(), llvm::TargetStackID::ScalableVector, and llvm::MachineFrameInfo::setObjectOffset().

estimateRSStackSizeLimit()

static unsigned estimateRSStackSizeLimit ( MachineFunction &  MF )

static

Look at each instruction that references stack frames and return the stack size limit beyond which some of these instructions will require a scratch register during their expansion later.

Definition at line 283 of file AArch64FrameLowering.cpp.

References llvm::AArch64FrameOffsetCannotUpdate, DefaultSafeSPDisplacement, llvm::isAArch64FrameOffsetLegal(), MBB, MI, and Offset.

Referenced by llvm::AArch64FrameLowering::determineCalleeSaves().

findScratchNonCalleeSaveRegister()

static unsigned findScratchNonCalleeSaveRegister ( MachineBasicBlock *  MBB )

static

Definition at line 588 of file AArch64FrameLowering.cpp.

References llvm::LivePhysRegs::addLiveIns(), llvm::LivePhysRegs::addReg(), llvm::LivePhysRegs::available(), llvm::MachineFunction::front(), llvm::MachineRegisterInfo::getCalleeSavedRegs(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getRegInfo(), llvm::AArch64Subtarget::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), i, MBB, MRI, Reg, and TRI.

Referenced by llvm::AArch64FrameLowering::canUseAsPrologue().

fixupCalleeSaveRestoreStackOffset()

static void fixupCalleeSaveRestoreStackOffset ( MachineInstr &  MI, uint64_t  LocalStackSize, bool  NeedsWinCFI, bool *  HasWinCFI  )

static

Definition at line 993 of file AArch64FrameLowering.cpp.

References assert(), fixupSEHOpcode(), llvm::MachineOperand::getImm(), llvm::AArch64InstrInfo::isSEHInstruction(), llvm_unreachable, MBBI, MI, and llvm::MachineOperand::setImm().

Referenced by llvm::AArch64FrameLowering::emitEpilogue().

fixupSEHOpcode()

static void fixupSEHOpcode ( MachineBasicBlock::iterator  MBBI, unsigned  LocalStackSize  )

static

Definition at line 859 of file AArch64FrameLowering.cpp.

References llvm::MachineOperand::getImm(), llvm_unreachable, MBBI, and llvm::MachineOperand::setImm().

Referenced by fixupCalleeSaveRestoreStackOffset().

getArgumentStackToRestore()

static int64_t getArgumentStackToRestore ( MachineFunction &  MF, MachineBasicBlock &  MBB  )

static

Returns how much of the incoming argument stack area (in bytes) we should clean up in an epilogue.

For the C calling convention this will be 0, for guaranteed tail call conventions it can be positive (a normal return or a tail call to a function that uses less stack space for arguments) or negative (for a tail call to a function that needs more stack space than us for arguments).

Definition at line 202 of file AArch64FrameLowering.cpp.

References llvm::MachineBasicBlock::end(), llvm::AArch64FunctionInfo::getArgumentStackToRestore(), llvm::MachineOperand::getImm(), llvm::MachineFunction::getInfo(), llvm::MachineBasicBlock::getLastNonDebugInstr(), MBB, and MBBI.

Referenced by llvm::AArch64FrameLowering::emitEpilogue().

getFixedObjectSize()

static unsigned getFixedObjectSize ( const MachineFunction &  MF, const AArch64FunctionInfo *  AFI, bool  IsWin64, bool  IsFunclet  )

static

Returns the size of the fixed object area (allocated next to sp on entry) On Win64 this may include a var args area and an UnwindHelp object for EH.

Definition at line 315 of file AArch64FrameLowering.cpp.

References llvm::alignTo(), llvm::AArch64FunctionInfo::getTailCallReservedStack(), llvm::AArch64FunctionInfo::getVarArgsGPRSize(), llvm::MachineFunction::hasEHFunclets(), and llvm::report_fatal_error().

Referenced by llvm::AArch64FrameLowering::emitEpilogue(), llvm::AArch64FrameLowering::emitPrologue(), getFPOffset(), and llvm::AArch64FrameLowering::processFunctionBeforeFrameFinalized().

getFPOffset()

static StackOffset getFPOffset ( const MachineFunction &  MF, int64_t  ObjectOffset  )

static

Definition at line 2007 of file AArch64FrameLowering.cpp.

References llvm::AArch64FunctionInfo::getCalleeSaveBaseToFrameRecordOffset(), llvm::AArch64FunctionInfo::getCalleeSavedStackSize(), llvm::Function::getCallingConv(), llvm::StackOffset::getFixed(), getFixedObjectSize(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), and llvm::MachineFunction::getSubtarget().

Referenced by llvm::AArch64FrameLowering::getSEHFrameIndexOffset(), and llvm::AArch64FrameLowering::resolveFrameOffsetReference().

getPrologueDeath()

static unsigned getPrologueDeath ( MachineFunction &  MF, unsigned  Reg  )

static

Definition at line 2182 of file AArch64FrameLowering.cpp.

References llvm::getKillRegState(), llvm::MachineFunction::getRegInfo(), llvm::MachineRegisterInfo::isLiveIn(), and Reg.

Referenced by llvm::AArch64FrameLowering::spillCalleeSavedRegisters().

getStackOffset()

static StackOffset getStackOffset ( const MachineFunction &  MF, int64_t  ObjectOffset  )

static

Definition at line 2021 of file AArch64FrameLowering.cpp.

References llvm::StackOffset::getFixed(), and llvm::MachineFunction::getFrameInfo().

Referenced by llvm::AArch64FrameLowering::getFrameIndexReferencePreferSP(), llvm::AArch64FrameLowering::getSEHFrameIndexOffset(), and llvm::AArch64FrameLowering::resolveFrameOffsetReference().

getSVECalleeSaveSlotRange()

static bool getSVECalleeSaveSlotRange ( const MachineFrameInfo &  MFI, int &  Min, int &  Max  )

static

returns true if there are any SVE callee saves.

Definition at line 2981 of file AArch64FrameLowering.cpp.

References assert(), contains(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineFrameInfo::isCalleeSavedInfoValid(), llvm::max(), and llvm::min().

Referenced by determineSVEStackObjectOffsets().

getSVEStackSize()

static StackOffset getSVEStackSize ( const MachineFunction &  MF )

static

Returns the size of the entire SVE stackframe (calleesaves + spills).

Definition at line 332 of file AArch64FrameLowering.cpp.

References llvm::MachineFunction::getInfo(), llvm::StackOffset::getScalable(), and llvm::AArch64FunctionInfo::getStackSizeSVE().

Referenced by llvm::AArch64FrameLowering::canUseRedZone(), llvm::AArch64FrameLowering::emitEpilogue(), llvm::AArch64FrameLowering::emitPrologue(), and llvm::AArch64FrameLowering::resolveFrameOffsetReference().

InsertReturnAddressAuth()

static void InsertReturnAddressAuth ( MachineFunction &  MF, MachineBasicBlock &  MBB  )

static

Definition at line 1640 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), llvm::MachineInstrBuilder::copyImplicitOps(), llvm::MCCFIInstruction::createNegateRAState(), DL, llvm::MachineBasicBlock::end(), llvm::MachineBasicBlock::erase(), llvm::MachineInstr::FrameDestroy, llvm::MachineBasicBlock::getFirstTerminator(), llvm::MachineFunction::getInfo(), llvm::AArch64Subtarget::getInstrInfo(), llvm::MachineFunction::getSubtarget(), llvm::AArch64Subtarget::hasPAuth(), MBB, MBBI, llvm::MachineInstrBuilder::setMIFlag(), llvm::MachineInstrBuilder::setMIFlags(), and TII.

Referenced by llvm::AArch64FrameLowering::emitEpilogue().

InsertSEH()

static MachineBasicBlock::iterator InsertSEH ( MachineBasicBlock::iterator  MBBI, const TargetInstrInfo &  TII, MachineInstr::MIFlag  Flag  )

static

Definition at line 739 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::BuildMI(), DL, llvm::MachineBasicBlock::getParent(), llvm::AArch64Subtarget::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), I, llvm::MachineBasicBlock::insertAfter(), LLVM_FALLTHROUGH, llvm_unreachable, MBB, MBBI, Reg, llvm::MachineInstrBuilder::setMIFlag(), and TII.

Referenced by convertCalleeSaveRestoreToSPPrePostIncDec(), llvm::AArch64FrameLowering::restoreCalleeSavedRegisters(), and llvm::AArch64FrameLowering::spillCalleeSavedRegisters().

invalidateRegisterPairing()

static bool invalidateRegisterPairing ( unsigned  Reg1, unsigned  Reg2, bool  UsesWinAAPCS, bool  NeedsWinCFI, bool  NeedsFrameRecord, bool  IsFirst  )

static

Returns true if Reg1 and Reg2 cannot be paired using a ldp/stp instruction.

WindowsCFI requires that only consecutive registers can be paired. LR and FP need to be allocated together when the frame needs to save the frame-record. This means any other register pairing with LR is invalid.

Definition at line 2231 of file AArch64FrameLowering.cpp.

References invalidateWindowsRegisterPairing().

Referenced by computeCalleeSaveRegisterPairs().

invalidateWindowsRegisterPairing()

static bool invalidateWindowsRegisterPairing ( unsigned  Reg1, unsigned  Reg2, bool  NeedsWinCFI, bool  IsFirst  )

static

Definition at line 2201 of file AArch64FrameLowering.cpp.

Referenced by computeCalleeSaveRegisterPairs(), and invalidateRegisterPairing().

isFuncletReturnInstr()

static bool isFuncletReturnInstr ( const MachineInstr &  MI )

static

Definition at line 1678 of file AArch64FrameLowering.cpp.

References llvm::ISD::CATCHRET, llvm::ISD::CLEANUPRET, and MI.

Referenced by llvm::AArch64FrameLowering::emitEpilogue().

IsSVECalleeSave()

static bool IsSVECalleeSave ( MachineBasicBlock::iterator  I )

static

Definition at line 1089 of file AArch64FrameLowering.cpp.

References llvm::MachineInstr::FrameDestroy, llvm::MachineInstr::FrameSetup, and I.

Referenced by llvm::AArch64FrameLowering::emitEpilogue().

isTargetWindows()

static bool isTargetWindows ( const MachineFunction &  MF )

static

Definition at line 1084 of file AArch64FrameLowering.cpp.

References llvm::MachineFunction::getSubtarget().

Referenced by computeCalleeSaveRegisterPairs().

needsWinCFI()

static bool needsWinCFI ( const MachineFunction &  MF )

static

Definition at line 649 of file AArch64FrameLowering.cpp.

References F, llvm::MachineFunction::getFunction(), llvm::TargetMachine::getMCAsmInfo(), llvm::MachineFunction::getTarget(), and llvm::MCAsmInfo::usesWindowsCFI().

Referenced by llvm::AArch64FrameLowering::assignCalleeSavedSpillSlots(), computeCalleeSaveRegisterPairs(), llvm::AArch64FrameLowering::emitEpilogue(), llvm::AArch64FrameLowering::emitPrologue(), llvm::AArch64FrameLowering::restoreCalleeSavedRegisters(), and llvm::AArch64FrameLowering::spillCalleeSavedRegisters().

produceCompactUnwindFrame()

static bool produceCompactUnwindFrame ( MachineFunction &  MF )

static

Definition at line 2192 of file AArch64FrameLowering.cpp.

References Attrs, llvm::Function::getAttributes(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getSubtarget(), llvm::AArch64Subtarget::getTargetLowering(), llvm::AArch64Subtarget::isTargetMachO(), llvm::AArch64TargetLowering::supportSwiftError(), and llvm::CallingConv::SwiftTail.

Referenced by computeCalleeSaveRegisterPairs().

STATISTIC()

STATISTIC	(	NumRedZoneFunctions	,
		"Number of functions using red zone"
	)

windowsRequiresStackProbe()

static bool windowsRequiresStackProbe ( MachineFunction &  MF, uint64_t  StackSizeInBytes  )

static

Definition at line 632 of file AArch64FrameLowering.cpp.

References F, llvm::MachineFunction::getFunction(), llvm::MachineFunction::getSubtarget(), and llvm::AArch64Subtarget::isTargetWindows().

Referenced by llvm::AArch64FrameLowering::determineCalleeSaves(), and llvm::AArch64FrameLowering::emitPrologue().

Variable Documentation

DefaultSafeSPDisplacement

const unsigned DefaultSafeSPDisplacement = 255

static

This is the biggest offset to the stack pointer we can encode in aarch64 instructions (without using a separate calculation and a temp register).

Note that the exception here are vector stores/loads which cannot encode any displacements (see estimateRSStackSizeLimit(), isAArch64FrameOffsetLegal()).

Definition at line 278 of file AArch64FrameLowering.cpp.

Referenced by estimateRSStackSizeLimit(), and llvm::AArch64FrameLowering::hasFP().

EnableHomogeneousPrologEpilog

cl::opt<bool> EnableHomogeneousPrologEpilog("homogeneous-prolog-epilog", cl::init(false), cl::ZeroOrMore, cl::Hidden, cl::desc("Emit homogeneous prologue and epilogue for the size " "optimization (default = off)"))

EnableRedZone

cl::opt<bool> EnableRedZone("aarch64-redzone", cl::desc("enable use of redzone on AArch64"), cl::init(false), cl::Hidden)

static

Referenced by llvm::AArch64FrameLowering::canUseRedZone().

OrderFrameObjects

cl::opt<bool> OrderFrameObjects("aarch64-order-frame-objects", cl::desc("sort stack allocations"), cl::init(true), cl::Hidden)

static

Referenced by llvm::AArch64FrameLowering::orderFrameObjects().

ReverseCSRRestoreSeq

cl::opt<bool> ReverseCSRRestoreSeq("reverse-csr-restore-seq", cl::desc("reverse the CSR restore sequence"), cl::init(false), cl::Hidden)

static

Referenced by adaptForLdStOpt(), and llvm::AArch64FrameLowering::restoreCalleeSavedRegisters().

StackTaggingMergeSetTag

cl::opt<bool> StackTaggingMergeSetTag("stack-tagging-merge-settag", cl::desc("merge settag instruction in function epilog"), cl::init(true), cl::Hidden)

static

Referenced by llvm::AArch64FrameLowering::processFunctionBeforeFrameIndicesReplaced().