LLVM: lib/CodeGen/TargetFrameLoweringImpl.cpp Source File (original) (raw)
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27using namespace llvm;
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35 return false;
36}
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61}
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70 int FI) const {
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80}
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85 CalleeSaves.resize(TRI.getNumRegs());
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89 return;
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92 CalleeSaves.set(Info.getReg());
93}
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103 SavedRegs.resize(TRI.getNumRegs());
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106 const MCPhysReg *CSRegs = nullptr;
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114 CSRegs = TRI.getIPRACSRegs(&MF);
115 else
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119 if (!CSRegs || CSRegs[0] == 0)
120 return;
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137 return;
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142 for (unsigned i = 0; CSRegs[i]; ++i) {
143 unsigned Reg = CSRegs[i];
144 if (CallsUnwindInit || MRI.isPhysRegModified(Reg))
145 SavedRegs.set(Reg);
146 }
147}
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152 return false;
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157}
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160 if (.hasLocalLinkage() || F.hasAddressTaken() ||
161 .hasFnAttribute(Attribute::NoRecurse))
162 return false;
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164 for (const User *U : F.users())
165 if (auto *CB = dyn_cast(U))
166 if (CB->isTailCall())
167 return false;
168 return true;
169}
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173}
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177 llvm_unreachable("getInitialCFARegister() not implemented!");
178}
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184}
unsigned const MachineRegisterInfo * MRI
This file contains the simple types necessary to represent the attributes associated with functions a...
This file implements the BitVector class.
Analysis containing CSE Info
unsigned const TargetRegisterInfo * TRI
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
void resize(unsigned N, bool t=false)
resize - Grow or shrink the bitvector.
The CalleeSavedInfo class tracks the information need to locate where a callee saved register is in t...
bool hasFnAttribute(Attribute::AttrKind Kind) const
Return true if the function has the attribute.
bool usesWindowsCFI() const
The MachineFrameInfo class represents an abstract stack frame until prolog/epilog code is inserted.
uint64_t getStackSize() const
Return the number of bytes that must be allocated to hold all of the fixed size frame objects.
int64_t getOffsetAdjustment() const
Return the correction for frame offsets.
bool isCalleeSavedInfoValid() const
Has the callee saved info been calculated yet?
const std::vector< CalleeSavedInfo > & getCalleeSavedInfo() const
Returns a reference to call saved info vector for the current function.
bool hasStackObjects() const
Return true if there are any stack objects in this function.
int64_t getObjectOffset(int ObjectIdx) const
Return the assigned stack offset of the specified object from the incoming stack pointer.
const TargetSubtargetInfo & getSubtarget() const
getSubtarget - Return the subtarget for which this machine code is being compiled.
bool needsFrameMoves() const
True if this function needs frame moves for debug or exceptions.
MachineFrameInfo & getFrameInfo()
getFrameInfo - Return the frame info object for the current function.
bool callsUnwindInit() const
MachineRegisterInfo & getRegInfo()
getRegInfo - Return information about the registers currently in use.
Function & getFunction()
Return the LLVM function that this machine code represents.
const TargetMachine & getTarget() const
getTarget - Return the target machine this machine code is compiled with
MachineRegisterInfo - Keep track of information for virtual and physical registers,...
const MCPhysReg * getCalleeSavedRegs() const
Returns list of callee saved registers.
Wrapper class representing virtual and physical registers.
StackOffset holds a fixed and a scalable offset in bytes.
int64_t getFixed() const
Returns the fixed component of the stack.
bool hasFP(const MachineFunction &MF) const
hasFP - Return true if the specified function should have a dedicated frame pointer register.
virtual bool allocateScavengingFrameIndexesNearIncomingSP(const MachineFunction &MF) const
Control the placement of special register scavenging spill slots when allocating a stack frame.
virtual void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, RegScavenger *RS=nullptr) const
This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() sh...
virtual bool enableCalleeSaveSkip(const MachineFunction &MF) const
Returns true if the target can safely skip saving callee-saved registers for noreturn nounwind functi...
virtual Register getInitialCFARegister(const MachineFunction &MF) const
Return initial CFA register value i.e.
virtual void getCalleeSaves(const MachineFunction &MF, BitVector &SavedRegs) const
Returns the callee-saved registers as computed by determineCalleeSaves in the BitVector SavedRegs.
int getOffsetOfLocalArea() const
getOffsetOfLocalArea - This method returns the offset of the local area from the stack pointer on ent...
virtual DwarfFrameBase getDwarfFrameBase(const MachineFunction &MF) const
Return the frame base information to be encoded in the DWARF subprogram debug info.
virtual bool needsFrameIndexResolution(const MachineFunction &MF) const
virtual bool isProfitableForNoCSROpt(const Function &F) const
Check if the no-CSR optimisation is profitable for the given function.
static bool isSafeForNoCSROpt(const Function &F)
Check if given function is safe for not having callee saved registers.
virtual bool enableCFIFixup(MachineFunction &MF) const
Returns true if we may need to fix the unwind information for the function.
virtual ~TargetFrameLowering()
virtual StackOffset getFrameIndexReferenceFromSP(const MachineFunction &MF, int FI) const
getFrameIndexReferenceFromSP - This method returns the offset from the stack pointer to the slot of t...
virtual int getInitialCFAOffset(const MachineFunction &MF) const
Return initial CFA offset value i.e.
virtual StackOffset getFrameIndexReference(const MachineFunction &MF, int FI, Register &FrameReg) const
getFrameIndexReference - This method should return the base register and offset used to reference a f...
const MCAsmInfo * getMCAsmInfo() const
Return target specific asm information.
unsigned EnableIPRA
This flag enables InterProcedural Register Allocation (IPRA).
TargetRegisterInfo base class - We assume that the target defines a static array of TargetRegisterDes...
virtual bool useFPForScavengingIndex(const MachineFunction &MF) const
Returns true if the target wants to use frame pointer based accesses to spill to the scavenger emerge...
bool hasStackRealignment(const MachineFunction &MF) const
True if stack realignment is required and still possible.
virtual Register getFrameRegister(const MachineFunction &MF) const =0
Debug information queries.
virtual const TargetRegisterInfo * getRegisterInfo() const
getRegisterInfo - If register information is available, return it.
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
This is an optimization pass for GlobalISel generic memory operations.