AArch64LowerHomogeneousPrologEpilog.cpp File Reference (original) (raw)

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Macros
#define	AARCH64_LOWER_HOMOGENEOUS_PROLOG_EPILOG_NAME "AArch64 homogeneous prolog/epilog lowering pass"

Enumerations
enum	FrameHelperType { Prolog, PrologFrame, Epilog, EpilogTail }

Functions
	INITIALIZE_PASS (AArch64LowerHomogeneousPrologEpilog, "aarch64-lower-homogeneous-prolog-epilog", AARCH64_LOWER_HOMOGENEOUS_PROLOG_EPILOG_NAME, false, false) bool AArch64LowerHomogeneousPrologEpilog
static std::string	getFrameHelperName (SmallVectorImpl< unsigned > &Regs, FrameHelperType Type, unsigned FpOffset)
	Return a frame helper name with the given CSRs and the helper type.
static MachineFunction &	createFrameHelperMachineFunction (Module M, MachineModuleInfo MMI, StringRef Name)
	Create a Function for the unique frame helper with the given name.
static void	emitStore (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator Pos, const TargetInstrInfo &TII, unsigned Reg1, unsigned Reg2, int Offset, bool IsPreDec)
	Emit a store-pair instruction for frame-setup.
static void	emitLoad (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator Pos, const TargetInstrInfo &TII, unsigned Reg1, unsigned Reg2, int Offset, bool IsPostDec)
	Emit a load-pair instruction for frame-destroy.
static Function *	getOrCreateFrameHelper (Module M, MachineModuleInfo MMI, SmallVectorImpl< unsigned > &Regs, FrameHelperType Type, unsigned FpOffset=0)
	Return a unique function if a helper can be formed with the given Regs and frame type.
static bool	shouldUseFrameHelper (MachineBasicBlock &MBB, MachineBasicBlock::iterator &NextMBBI, SmallVectorImpl< unsigned > &Regs, FrameHelperType Type)
	This function checks if a frame helper should be used for HOM_Prolog/HOM_Epilog pseudo instruction expansion.

Variables
static cl::opt< int >	FrameHelperSizeThreshold ("frame-helper-size-threshold", cl::init(2), cl::Hidden, cl::desc("The minimum number of instructions that are outlined in a frame " "helper (default = 2)"))

◆ AARCH64_LOWER_HOMOGENEOUS_PROLOG_EPILOG_NAME

#define AARCH64_LOWER_HOMOGENEOUS_PROLOG_EPILOG_NAME "AArch64 homogeneous prolog/epilog lowering pass"

◆ FrameHelperType

◆ createFrameHelperMachineFunction()

Create a Function for the unique frame helper with the given name.

Return a newly created MachineFunction with an empty MachineBasicBlock.

Definition at line 155 of file AArch64LowerHomogeneousPrologEpilog.cpp.

References assert(), llvm::MachineFunction::begin(), llvm::CallingConv::C, llvm::BasicBlock::Create(), llvm::Function::Create(), llvm::MachineFunction::CreateMachineBasicBlock(), llvm::GlobalValue::ExternalLinkage, F, llvm::MachineRegisterInfo::freezeReservedRegs(), llvm::FunctionType::get(), llvm::MachineModuleInfo::getOrCreateMachineFunction(), llvm::MachineFunction::getProperties(), llvm::MachineFunction::getRegInfo(), llvm::Type::getVoidTy(), llvm::GlobalValue::Global, llvm::MachineFunction::insert(), llvm::GlobalValue::LinkOnceODRLinkage, and MBB.

Referenced by getOrCreateFrameHelper().

◆ emitLoad()

Emit a load-pair instruction for frame-destroy.

If Reg2 is AArch64::NoRegister, emit LDR instead.

Definition at line 234 of file AArch64LowerHomogeneousPrologEpilog.cpp.

References llvm::MachineInstrBuilder::addDef(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), assert(), llvm::BuildMI(), contains(), llvm::dwarf_linker::DebugLoc, llvm::MachineInstr::FrameDestroy, llvm::getDefRegState(), llvm::AArch64InstrInfo::getMemOpInfo(), MBB, llvm::Offset, Opc, llvm::MachineInstrBuilder::setMIFlag(), Success, and TII.

Referenced by getOrCreateFrameHelper().

◆ emitStore()

Emit a store-pair instruction for frame-setup.

If Reg2 is AArch64::NoRegister, emit STR instead.

Definition at line 193 of file AArch64LowerHomogeneousPrologEpilog.cpp.

References llvm::MachineInstrBuilder::addDef(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), assert(), llvm::BuildMI(), contains(), llvm::dwarf_linker::DebugLoc, llvm::MachineInstr::FrameSetup, llvm::AArch64InstrInfo::getMemOpInfo(), MBB, llvm::Offset, Opc, llvm::MachineInstrBuilder::setMIFlag(), Success, and TII.

Referenced by getOrCreateFrameHelper().

◆ getFrameHelperName()

◆ getOrCreateFrameHelper()

Return a unique function if a helper can be formed with the given Regs and frame type.

_OUTLINED_FUNCTION_PROLOG_x30x29x19x20x21x22: stp x22, x21, [sp, #-32]! ; x29/x30 has been stored at the caller stp x20, x19, [sp, #16] ret
_OUTLINED_FUNCTION_PROLOG_FRAME32_x30x29x19x20x21x22: stp x22, x21, [sp, #-32]! ; x29/x30 has been stored at the caller stp x20, x19, [sp, #16] add fp, sp, #32 ret
_OUTLINED_FUNCTION_EPILOG_x30x29x19x20x21x22: mov x16, x30 ldp x29, x30, [sp, #32] ldp x20, x19, [sp, #16] ldp x22, x21, [sp], #48 ret x16
_OUTLINED_FUNCTION_EPILOG_TAIL_x30x29x19x20x21x22: ldp x29, x30, [sp, #32] ldp x20, x19, [sp, #16] ldp x22, x21, [sp], #48 ret

Parameters

M	module
MMI	machine module info
Regs	callee save regs that the helper will handle
Type	frame helper type

Returns

a helper function

Definition at line 303 of file AArch64LowerHomogeneousPrologEpilog.cpp.

References llvm::MachineInstrBuilder::addDef(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::MachineInstrBuilder::addUse(), assert(), llvm::MachineFunction::begin(), llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::BuildMI(), createFrameHelperMachineFunction(), emitLoad(), emitStore(), Epilog, EpilogTail, F, llvm::find(), llvm::MachineInstr::FrameSetup, getFrameHelperName(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MachineFunction::getSubtarget(), I, MBB, Prolog, PrologFrame, llvm::MachineInstrBuilder::setMIFlag(), Size, llvm::SmallVectorTemplateCommon< T, typename >::size(), and TII.

◆ INITIALIZE_PASS()

INITIALIZE_PASS	(	AArch64LowerHomogeneousPrologEpilog	,
"aarch64-lower-homogeneous-prolog-epilog"	,
AARCH64_LOWER_HOMOGENEOUS_PROLOG_EPILOG_NAME	,
false	,
false	)

◆ shouldUseFrameHelper()

This function checks if a frame helper should be used for HOM_Prolog/HOM_Epilog pseudo instruction expansion.

Parameters

MBB	machine basic block
NextMBBI	next instruction following HOM_Prolog/HOM_Epilog
Regs	callee save registers that are saved or restored.
Type	frame helper type

Returns

True if a use of helper is qualified.

Definition at line 385 of file AArch64LowerHomogeneousPrologEpilog.cpp.

References assert(), Epilog, EpilogTail, FrameHelperSizeThreshold, llvm::is_contained(), MBB, Prolog, PrologFrame, llvm::SmallVectorTemplateCommon< T, typename >::size(), and TRI.

◆ FrameHelperSizeThreshold

cl::opt< int > FrameHelperSizeThreshold("frame-helper-size-threshold", cl::init(2), cl::Hidden, cl::desc("The minimum number of instructions that are outlined in a frame " "helper (default = 2)")) ( "frame-helper-size-threshold" , cl::init(2) , cl::Hidden , cl::desc("The minimum number of instructions that are outlined in a frame " "helper (default = 2)") )	static