MCInstPrinter::printRegName

I have a question regarding implementation of subclasses of MCInstPrinter.
I am implementing Machine IR layer to MC layer lowering for Mips.

What’s the best way to print the value of “Register” in the following code in MCAsmStreamer::EmitRegisterName? Do I have to convert the LLVM register number back to its corresponding dwarf register number in function InstPrinter->printRegName? I just want to have it output the same register number as before (the same output the false path would produce).

void MCAsmStreamer::EmitRegisterName(int64_t Register) {
if (InstPrinter) {
const TargetAsmInfo &asmInfo = getContext().getTargetAsmInfo();
unsigned LLVMRegister = asmInfo.getLLVMRegNum(Register, true);
InstPrinter->printRegName(OS, LLVMRegister);
} else {
OS << Register;
}
}

My current implementation of printRegName which I copied from other backends (X86, ARM and PowerPC) looks like this:

void MipsInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
OS << getRegisterName(RegNo);
}

This will result in code like this
.cfi_offset RA, -4
, instead of something like this:
.cfi_offset 31, -4