class RegisterBankInfo::OperandsMapper

Declaration

class RegisterBankInfo::OperandsMapper { /* full declaration omitted */ };

Description

Helper class used to get/create the virtual registers that will be used to replace the MachineOperand when applying a mapping.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:279

Member Variables

private SmallVector<int, 8> OpToNewVRegIdx

The OpIdx-th cell contains the index in NewVRegs where the VRegs of the OpIdx-th operand starts. -1 means we do not have such mapping yet. Note: We use a SmallVector to avoid heap allocation for most cases.

private SmallVector<llvm::Register, 8> NewVRegs

Hold the registers that will be used to map MI with InstrMapping.

private llvm::MachineRegisterInfo& MRI

Current MachineRegisterInfo, used to create new virtual registers.

private llvm::MachineInstr& MI

Instruction being remapped.

private const llvm::RegisterBankInfo::InstructionMapping& InstrMapping

New mapping of the instruction.

private static const int DontKnowIdx

Constant value identifying that the index in OpToNewVRegIdx for an operand has not been set yet.

Method Overview

• public OperandsMapper(llvm::MachineInstr & MI, const llvm::RegisterBankInfo::InstructionMapping & InstrMapping, llvm::MachineRegisterInfo & MRI)
• public void createVRegs(unsigned int OpIdx)
• public void dump() const
• public const llvm::RegisterBankInfo::InstructionMapping & getInstrMapping() const
• public llvm::MachineInstr & getMI() const
• public llvm::MachineRegisterInfo & getMRI() const
• private SmallVectorImpl<Register>::const_iterator getNewVRegsEnd(unsigned int StartIdx, unsigned int NumVal) const
• private SmallVectorImpl<Register>::iterator getNewVRegsEnd(unsigned int StartIdx, unsigned int NumVal)
• public iterator_range<SmallVectorImpl<Register>::const_iterator> getVRegs(unsigned int OpIdx, bool ForDebug = false) const
• private iterator_range<SmallVectorImpl<Register>::iterator> getVRegsMem(unsigned int OpIdx)
• public void print(llvm::raw_ostream & OS, bool ForDebug = false) const
• public void setVRegs(unsigned int OpIdx, unsigned int PartialMapIdx, llvm::Register NewVReg)

Methods

¶OperandsMapper(
    llvm::MachineInstr& MI,
    const llvm::RegisterBankInfo::
        InstructionMapping& InstrMapping,
    llvm::MachineRegisterInfo& MRI)

Description

Create an OperandsMapper that will hold the information to apply \p InstrMapping to \p MI.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:322

Parameters

llvm::MachineInstr& MI

const llvm::RegisterBankInfo::InstructionMapping& InstrMapping

llvm::MachineRegisterInfo& MRI

¶void createVRegs(unsigned int OpIdx)

Description

Create as many new virtual registers as needed for the mapping of the \p OpIdx-th operand. The number of registers is determined by the number of breakdown for the related operand in the instruction mapping. The type of the new registers is a plain scalar of the right size. The proper type is expected to be set when the mapping is applied to the instruction(s) that realizes the mapping.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:349

Parameters

unsigned int OpIdx

¶void dump() const

Description

Print this operands mapper on dbgs() stream.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:379

¶const llvm::RegisterBankInfo::InstructionMapping&
getInstrMapping() const

Description

The final mapping of the instruction.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:331

¶llvm::MachineInstr& getMI() const

Description

@ { The MachineInstr being remapped.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:328

¶llvm::MachineRegisterInfo& getMRI() const

Description

The MachineRegisterInfo we used to realize the mapping.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:334

¶SmallVectorImpl<Register>::const_iterator
getNewVRegsEnd(unsigned int StartIdx,
               unsigned int NumVal) const

Description

Get the end iterator for a range starting at \p StartIdx and spannig \p NumVal in NewVRegs.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:314

Parameters

unsigned int StartIdx

unsigned int NumVal

¶SmallVectorImpl<Register>::iterator
getNewVRegsEnd(unsigned int StartIdx,
               unsigned int NumVal)

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:315

Parameters

unsigned int StartIdx

unsigned int NumVal

¶iterator_range<
    SmallVectorImpl<Register>::const_iterator>
getVRegs(unsigned int OpIdx,
         bool ForDebug = false) const

Description

Get all the virtual registers required to map the \p OpIdx-th operand of the instruction. This return an empty range when createVRegs or setVRegs has not been called. The iterator may be invalidated by a call to setVRegs or createVRegs. When \p ForDebug is true, we will not check that the list of new virtual registers does not contain uninitialized values.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:376

Parameters

unsigned int OpIdx

bool ForDebug = false

¶iterator_range<
    SmallVectorImpl<Register>::iterator>
getVRegsMem(unsigned int OpIdx)

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:308

Parameters

unsigned int OpIdx

¶void print(llvm::raw_ostream& OS,
           bool ForDebug = false) const

Description

Print this operands mapper on \p OS stream.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:382

Parameters

llvm::raw_ostream& OS

bool ForDebug = false

¶void setVRegs(unsigned int OpIdx,
              unsigned int PartialMapIdx,
              llvm::Register NewVReg)

Description

Set the virtual register of the \p PartialMapIdx-th partial mapping of the OpIdx-th operand to \p NewVReg.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:361

Parameters

unsigned int OpIdx

unsigned int PartialMapIdx

llvm::Register NewVReg