LLVM: llvm::RegsForValue Struct Reference (original) (raw)

This struct represents the registers (physical or virtual) that a particular set of values is assigned, and the type information about the value. More...

#include "[CodeGen/SelectionDAG/SelectionDAGBuilder.h](SelectionDAGBuilder%5F8h%5Fsource.html)"

Public Member Functions
RegsForValue ()=default
RegsForValue (const SmallVector< Register, 4 > &regs, MVT regvt, EVT valuevt, std::optional< CallingConv::ID > CC=std::nullopt)
RegsForValue (LLVMContext &Context, const TargetLowering &TLI, const DataLayout &DL, Register Reg, Type *Ty, std::optional< CallingConv::ID > CC)
bool isABIMangled () const
void append (const RegsForValue &RHS)
Add the specified values to this one.
SDValue getCopyFromRegs (SelectionDAG &DAG, FunctionLoweringInfo &FuncInfo, const SDLoc &dl, SDValue &Chain, SDValue *Glue, const Value *V=nullptr) const
Emit a series of CopyFromReg nodes that copies from this value and returns the result as a ValueVTs value.
void getCopyToRegs (SDValue Val, SelectionDAG &DAG, const SDLoc &dl, SDValue &Chain, SDValue *Glue, const Value *V=nullptr, ISD::NodeType PreferredExtendType=ISD::ANY_EXTEND) const
Emit a series of CopyToReg nodes that copies the specified value into the registers specified by this object.
void AddInlineAsmOperands (InlineAsm::Kind Code, bool HasMatching, unsigned MatchingIdx, const SDLoc &dl, SelectionDAG &DAG, std::vector< SDValue > &Ops) const
Add this value to the specified inlineasm node operand list.
bool occupiesMultipleRegs () const
Check if the total RegCount is greater than one.
SmallVector< std::pair< Register, TypeSize >, 4 > getRegsAndSizes () const
Return a list of registers and their sizes.
Public Attributes
SmallVector< EVT, 4 > ValueVTs
The value types of the values, which may not be legal, and may need be promoted or synthesized from one or more registers.
SmallVector< MVT, 4 > RegVTs
The value types of the registers.
SmallVector< Register, 4 > Regs
This list holds the registers assigned to the values.
SmallVector< unsigned, 4 > RegCount
This list holds the number of registers for each value.
std::optional< CallingConv::ID > CallConv
Records if this value needs to be treated in an ABI dependant manner, different to normal type legalization.

This struct represents the registers (physical or virtual) that a particular set of values is assigned, and the type information about the value.

The most common situation is to represent one value at a time, but struct or array values are handled element-wise as multiple values. The splitting of aggregates is performed recursively, so that we never have aggregate-typed registers. The values at this point do not necessarily have legal types, so each value may require one or more registers of some legal type.

Definition at line 759 of file SelectionDAGBuilder.h.

llvm::RegsForValue::RegsForValue ( ) default

◆ RegsForValue() [2/3]

◆ RegsForValue() [3/3]

Definition at line 867 of file SelectionDAGBuilder.cpp.

References CallConv, llvm::ComputeValueVTs(), DL, llvm::TargetLoweringBase::getNumRegisters(), llvm::TargetLoweringBase::getNumRegistersForCallingConv(), llvm::TargetLoweringBase::getRegisterType(), llvm::TargetLoweringBase::getRegisterTypeForCallingConv(), isABIMangled(), RegCount, Regs, RegVTs, and ValueVTs.

◆ AddInlineAsmOperands()

Add this value to the specified inlineasm node operand list.

This adds the code marker, matching input operand index (if applicable), and includes the number of values added into it.

Definition at line 1033 of file SelectionDAGBuilder.cpp.

References AbstractManglingParser< Derived, Alloc >::Ops, assert(), llvm::InlineAsm::Clobber, llvm::SelectionDAG::getContext(), llvm::MachineFunction::getFrameInfo(), llvm::TargetRegisterClass::getID(), llvm::SelectionDAG::getMachineFunction(), llvm::TargetLoweringBase::getNumRegisters(), llvm::MachineFunction::getRegInfo(), llvm::SelectionDAG::getRegister(), llvm::TargetLoweringBase::getStackPointerRegisterToSaveRestore(), llvm::SelectionDAG::getTargetConstant(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::MachineFrameInfo::hasOpaqueSPAdjustment(), I, MRI, Regs, RegVTs, and ValueVTs.

◆ append()

◆ getCopyFromRegs()

Emit a series of CopyFromReg nodes that copies from this value and returns the result as a ValueVTs value.

This uses Chain/Flag as the input and updates them for the output Chain/Flag. If the Flag pointer is NULL, no flag is used.

Definition at line 891 of file SelectionDAGBuilder.cpp.

References assert(), llvm::ISD::AssertSext, llvm::ISD::AssertZext, llvm::SmallVectorTemplateCommon< T, typename >::begin(), CallConv, llvm::SmallVectorImpl< T >::clear(), llvm::KnownBits::countMinLeadingZeros(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getContext(), getCopyFromParts(), llvm::SelectionDAG::getCopyFromReg(), llvm::EVT::getIntegerVT(), llvm::FunctionLoweringInfo::GetLiveOutRegInfo(), llvm::SelectionDAG::getNode(), llvm::TargetLoweringBase::getRegisterTypeForCallingConv(), llvm::MVT::getScalarSizeInBits(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SelectionDAG::getValueType(), llvm::SelectionDAG::getVTList(), isABIMangled(), llvm::MVT::isInteger(), llvm::FunctionLoweringInfo::LiveOutInfo::Known, llvm::ISD::MERGE_VALUES, llvm::FunctionLoweringInfo::LiveOutInfo::NumSignBits, P, RegCount, Regs, RegSize, RegVTs, llvm::SmallVectorImpl< T >::resize(), SDValue(), and ValueVTs.

Referenced by llvm::SelectionDAGBuilder::getCopyFromRegs(), and llvm::SelectionDAGBuilder::getValueImpl().

◆ getCopyToRegs()

Emit a series of CopyToReg nodes that copies the specified value into the registers specified by this object.

This uses Chain/Flag as the input and updates them for the output Chain/Flag. If the Flag pointer is nullptr, no flag is used. If V is not nullptr, then it is used in printing better diagnostic messages on error.

Definition at line 977 of file SelectionDAGBuilder.cpp.

References llvm::ISD::ANY_EXTEND, CallConv, llvm::SelectionDAG::getContext(), getCopyToParts(), llvm::SelectionDAG::getCopyToReg(), llvm::SelectionDAG::getNode(), llvm::TargetLoweringBase::getRegisterTypeForCallingConv(), llvm::SDValue::getResNo(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SDValue::getValue(), isABIMangled(), llvm::TargetLoweringBase::isZExtFree(), RegCount, Regs, RegVTs, llvm::ISD::TokenFactor, ValueVTs, and llvm::ISD::ZERO_EXTEND.

Referenced by llvm::SelectionDAGBuilder::CopyValueToVirtualRegister(), llvm::SelectionDAGBuilder::LowerAsSTATEPOINT(), and llvm::SelectionDAGBuilder::LowerStatepoint().

◆ getRegsAndSizes()

◆ isABIMangled()

bool llvm::RegsForValue::isABIMangled ( ) const inline

◆ occupiesMultipleRegs()

bool llvm::RegsForValue::occupiesMultipleRegs ( ) const inline

◆ CallConv

◆ RegCount

◆ Regs

◆ RegVTs

The value types of the registers.

This is the same size as ValueVTs and it records, for each value, what the type of the assigned register or registers are. (Individual values are never synthesized from more than one type of register.)

With virtual registers, the contents of RegVTs is redundant with TLI's getRegisterType member function, however when with physical registers it is necessary to have a separate record of the types.

Definition at line 772 of file SelectionDAGBuilder.h.

Referenced by AddInlineAsmOperands(), append(), getCopyFromRegs(), getCopyToRegs(), getRegsAndSizes(), RegsForValue(), and RegsForValue().

◆ ValueVTs

The documentation for this struct was generated from the following files: