¶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::TargetRegisterClass& RegClass,
    llvm::MachineOperand& RegMO)

Description

Constrain the Register operand OpIdx, so that it is now constrained to the TargetRegisterClass passed as an argument (RegClass). 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. The debug location of \p InsertPt is used for the new copy.

Declared at: llvm/include/llvm/CodeGen/GlobalISel/Utils.h:102

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::TargetRegisterClass& RegClass

llvm::MachineOperand& RegMO

Returns

The virtual register constrained to the right register class.