struct RegsForValue

Declaration

struct RegsForValue { /* full declaration omitted */ };

Description

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.

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:832

Member Variables

public SmallVector<llvm::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.

public SmallVector<llvm::MVT, 4> RegVTs

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.

public SmallVector<unsigned int, 4> 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.

public SmallVector<unsigned int, 4> RegCount

This list holds the number of registers for each value.

public Optional<CallingConv::ID> CallConv

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

Method Overview

• public void AddInlineAsmOperands(unsigned int Code, bool HasMatching, unsigned int MatchingIdx, const llvm::SDLoc & dl, llvm::SelectionDAG & DAG, std::vector<SDValue> & Ops) const
• public RegsForValue()
• public RegsForValue(const SmallVector<unsigned int, 4> & regs, llvm::MVT regvt, llvm::EVT valuevt, Optional<CallingConv::ID> CC = None)
• public RegsForValue(llvm::LLVMContext & Context, const llvm::TargetLowering & TLI, const llvm::DataLayout & DL, unsigned int Reg, llvm::Type * Ty, Optional<CallingConv::ID> CC)
• public void append(const llvm::RegsForValue & RHS)
• public llvm::SDValue getCopyFromRegs(llvm::SelectionDAG & DAG, llvm::FunctionLoweringInfo & FuncInfo, const llvm::SDLoc & dl, llvm::SDValue & Chain, llvm::SDValue * Flag, const llvm::Value * V = nullptr) const
• public void getCopyToRegs(llvm::SDValue Val, llvm::SelectionDAG & DAG, const llvm::SDLoc & dl, llvm::SDValue & Chain, llvm::SDValue * Flag, const llvm::Value * V = nullptr, ISD::NodeType PreferredExtendType = ISD::ANY_EXTEND) const
• public SmallVector<std::pair<unsigned int, unsigned int>, 4> getRegsAndSizes() const
• public bool isABIMangled() const
• public bool occupiesMultipleRegs() const

Methods

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

Description

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.

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:898

Parameters

unsigned int Code

bool HasMatching

unsigned int MatchingIdx

const llvm::SDLoc& dl

llvm::SelectionDAG& DAG

std::vector<SDValue>& Ops

¶RegsForValue()

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:859

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

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:860

Parameters

const SmallVector<unsigned int, 4>& regs

llvm::MVT regvt

llvm::EVT valuevt

Optional<CallingConv::ID> CC = None

¶RegsForValue(llvm::LLVMContext& Context,
             const llvm::TargetLowering& TLI,
             const llvm::DataLayout& DL,
             unsigned int Reg,
             llvm::Type* Ty,
             Optional<CallingConv::ID> CC)

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:862

Parameters

llvm::LLVMContext& Context

const llvm::TargetLowering& TLI

const llvm::DataLayout& DL

unsigned int Reg

llvm::Type* Ty

Optional<CallingConv::ID> CC

¶void append(const llvm::RegsForValue& RHS)

Description

Add the specified values to this one.

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:871

Parameters

const llvm::RegsForValue& RHS

¶llvm::SDValue getCopyFromRegs(
    llvm::SelectionDAG& DAG,
    llvm::FunctionLoweringInfo& FuncInfo,
    const llvm::SDLoc& dl,
    llvm::SDValue& Chain,
    llvm::SDValue* Flag,
    const llvm::Value* V = nullptr) const

Description

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.

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:882

Parameters

llvm::SelectionDAG& DAG

llvm::FunctionLoweringInfo& FuncInfo

const llvm::SDLoc& dl

llvm::SDValue& Chain

llvm::SDValue* Flag

const llvm::Value* V = nullptr

¶void getCopyToRegs(
    llvm::SDValue Val,
    llvm::SelectionDAG& DAG,
    const llvm::SDLoc& dl,
    llvm::SDValue& Chain,
    llvm::SDValue* Flag,
    const llvm::Value* V = nullptr,
    ISD::NodeType PreferredExtendType =
        ISD::ANY_EXTEND) const

Description

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.

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:891

Parameters

llvm::SDValue Val

llvm::SelectionDAG& DAG

const llvm::SDLoc& dl

llvm::SDValue& Chain

llvm::SDValue* Flag

const llvm::Value* V = nullptr

ISD::NodeType PreferredExtendType = ISD::ANY_EXTEND

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

Description

Return a list of registers and their sizes.

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:908

¶bool isABIMangled() const

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:866

¶bool occupiesMultipleRegs() const

Description

Check if the total RegCount is greater than one.

Declared at: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h:903