¶unsigned int constrainOperandRegClass(
    const llvm::MachineFunction& MF,
    const llvm::TargetRegisterInfo& TRI,
    llvm::MachineRegisterInfo& MRI,
    const llvm::TargetInstrInfo& TII,
    const llvm::RegisterBankInfo& RBI,
    llvm::MachineInstr& InsertPt,
    const llvm::MCInstrDesc& II,
    const llvm::MachineOperand& RegMO,
    unsigned int OpIdx)

Description

Try to constrain Reg so that it is usable by argument OpIdx of the provided MCInstrDesc \p II. If this fails, create a new virtual register in the correct class and insert a COPY before \p InsertPt if it is a use or after if it is a definition. This is equivalent to constrainOperandRegClass(..., RegClass, ...) with RegClass obtained from the MCInstrDesc. The debug location of \p InsertPt is used for the new copy.

Declared at: llvm/include/llvm/CodeGen/GlobalISel/Utils.h:75

Parameters

const llvm::MachineFunction& MF

const llvm::TargetRegisterInfo& TRI

llvm::MachineRegisterInfo& MRI

const llvm::TargetInstrInfo& TII

const llvm::RegisterBankInfo& RBI

llvm::MachineInstr& InsertPt

const llvm::MCInstrDesc& II

const llvm::MachineOperand& RegMO

unsigned int OpIdx

Returns

The virtual register constrained to the right register class.