if (TM.getInstrInfo().isTwoAddrInstr(MI->getOpcode()) && i == 0) {
// must be same register number as the first operand
// This maps a = b + c into b += c, and saves b into a's spot
+ assert(MI->getOperand(1).isRegister() &&
+ MI->getOperand(1).getAllocatedRegNum() &&
+ MF->getRegClass(virtualReg) ==
+ PhysRegClasses[MI->getOperand(1).getAllocatedRegNum()] &&
+ "Two address instruction invalid!");
+
physReg = MI->getOperand(1).getAllocatedRegNum();
} else {
physReg = getFreeReg(virtualReg);