LLVM  8.0.0svn
Public Member Functions | Public Attributes | List of all members
llvm::RegsForValue Struct Reference

RegsForValue - 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"

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Public Member Functions

 RegsForValue ()=default
 
 RegsForValue (const SmallVector< unsigned, 4 > &regs, MVT regvt, EVT valuevt, Optional< CallingConv::ID > CC=None)
 
 RegsForValue (LLVMContext &Context, const TargetLowering &TLI, const DataLayout &DL, unsigned Reg, Type *Ty, Optional< CallingConv::ID > CC)
 
bool isABIMangled () const
 
void append (const RegsForValue &RHS)
 Add the specified values to this one. More...
 
SDValue getCopyFromRegs (SelectionDAG &DAG, FunctionLoweringInfo &FuncInfo, const SDLoc &dl, SDValue &Chain, SDValue *Flag, const Value *V=nullptr) const
 Emit a series of CopyFromReg nodes that copies from this value and returns the result as a ValueVTs value. More...
 
void getCopyToRegs (SDValue Val, SelectionDAG &DAG, const SDLoc &dl, SDValue &Chain, SDValue *Flag, 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. More...
 
void AddInlineAsmOperands (unsigned 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. More...
 
bool occupiesMultipleRegs () const
 Check if the total RegCount is greater than one. More...
 
SmallVector< std::pair< unsigned, unsigned >, 4 > getRegsAndSizes () const
 Return a list of registers and their sizes. More...
 

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. More...
 
SmallVector< MVT, 4 > RegVTs
 The value types of the registers. More...
 
SmallVector< unsigned, 4 > Regs
 This list holds the registers assigned to the values. More...
 
SmallVector< unsigned, 4 > RegCount
 This list holds the number of registers for each value. More...
 
Optional< CallingConv::IDCallConv
 Records if this value needs to be treated in an ABI dependant manner, different to normal type legalization. More...
 

Detailed Description

RegsForValue - 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 993 of file SelectionDAGBuilder.h.

Constructor & Destructor Documentation

◆ RegsForValue() [1/3]

llvm::RegsForValue::RegsForValue ( )
default

Referenced by GetRegistersForValue().

◆ RegsForValue() [2/3]

RegsForValue::RegsForValue ( const SmallVector< unsigned, 4 > &  regs,
MVT  regvt,
EVT  valuevt,
Optional< CallingConv::ID CC = None 
)

Definition at line 757 of file SelectionDAGBuilder.cpp.

◆ RegsForValue() [3/3]

RegsForValue::RegsForValue ( LLVMContext Context,
const TargetLowering TLI,
const DataLayout DL,
unsigned  Reg,
Type Ty,
Optional< CallingConv::ID CC 
)

Member Function Documentation

◆ AddInlineAsmOperands()

void RegsForValue::AddInlineAsmOperands ( unsigned  Code,
bool  HasMatching,
unsigned  MatchingIdx,
const SDLoc dl,
SelectionDAG DAG,
std::vector< SDValue > &  Ops 
) const

◆ append()

void llvm::RegsForValue::append ( const RegsForValue RHS)
inline

◆ getCopyFromRegs()

SDValue RegsForValue::getCopyFromRegs ( SelectionDAG DAG,
FunctionLoweringInfo FuncInfo,
const SDLoc dl,
SDValue Chain,
SDValue Flag,
const Value V = nullptr 
) const

◆ getCopyToRegs()

void RegsForValue::getCopyToRegs ( SDValue  Val,
SelectionDAG DAG,
const SDLoc dl,
SDValue Chain,
SDValue Flag,
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.

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 873 of file SelectionDAGBuilder.cpp.

References llvm::ISD::ANY_EXTEND, llvm::SelectionDAG::getContext(), getCopyToParts(), llvm::SelectionDAG::getCopyToReg(), llvm::SelectionDAG::getNode(), llvm::TargetLoweringBase::getRegisterTypeForCallingConv(), llvm::SDValue::getResNo(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SDValue::getValue(), llvm::Optional< T >::getValue(), isABIMangled(), llvm::TargetLoweringBase::isZExtFree(), llvm::MVT::Other, RegCount, Regs, RegVTs, llvm::SmallVectorBase::size(), llvm::ISD::TokenFactor, ValueVTs, and llvm::ISD::ZERO_EXTEND.

◆ getRegsAndSizes()

SmallVector< std::pair< unsigned, unsigned >, 4 > RegsForValue::getRegsAndSizes ( ) const

Return a list of registers and their sizes.

Definition at line 983 of file SelectionDAGBuilder.cpp.

References E, llvm::MVT::getSizeInBits(), I, llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back(), RegCount, Regs, RegVTs, and llvm::zip_first().

◆ isABIMangled()

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

Definition at line 1027 of file SelectionDAGBuilder.h.

References llvm::Optional< T >::hasValue().

Referenced by getCopyFromRegs(), getCopyToRegs(), and RegsForValue().

◆ occupiesMultipleRegs()

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

Check if the total RegCount is greater than one.

Definition at line 1064 of file SelectionDAGBuilder.h.

References llvm::SmallVectorTemplateCommon< T, typename >::begin(), and llvm::SmallVectorTemplateCommon< T, typename >::end().

Member Data Documentation

◆ CallConv

Optional<CallingConv::ID> llvm::RegsForValue::CallConv

Records if this value needs to be treated in an ABI dependant manner, different to normal type legalization.

Definition at line 1018 of file SelectionDAGBuilder.h.

Referenced by getCopyFromRegs().

◆ RegCount

SmallVector<unsigned, 4> llvm::RegsForValue::RegCount

This list holds the number of registers for each value.

Definition at line 1014 of file SelectionDAGBuilder.h.

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

◆ Regs

SmallVector<unsigned, 4> llvm::RegsForValue::Regs

This list holds the registers assigned to the values.

Each legal or promoted value requires one register, and each expanded value requires multiple registers.

Definition at line 1011 of file SelectionDAGBuilder.h.

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

◆ RegVTs

SmallVector<MVT, 4> llvm::RegsForValue::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 1006 of file SelectionDAGBuilder.h.

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

◆ ValueVTs

SmallVector<EVT, 4> llvm::RegsForValue::ValueVTs

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