// Make sure the instruction is EXACTLY `xchg ax, ax'
if (MI.getOpcode() == X86::XCHGrr16) {
const MachineOperand &op0 = MI.getOperand(0), &op1 = MI.getOperand(1);
- if (op0.isMachineRegister() && op0.getMachineRegNum() == X86::AX &&
- op1.isMachineRegister() && op1.getMachineRegNum() == X86::AX) {
+ if (op0.isPhysicalRegister() && op0.getReg() == X86::AX &&
+ op1.isPhysicalRegister() && op1.getReg() == X86::AX) {
return true;
}
}