¶llvm::Register 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,
    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. In both cases, the function also updates the register of RegMo. 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:121

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

llvm::MachineOperand& RegMO

unsigned int OpIdx

Returns

The virtual register constrained to the right register class.