Intel Corporation Verification Engineer interview questions

Second interview question: Given the following assembly commands: MOV Ri <-- Rj/immediate (put register j or immediate value into reg i) INC Ri (++) DEC Ri (--) JNZ Ri (jump not zero) 1. Code an assembly program that calculates x*y where x and y are unsigned integers 2. What values of x and y will cause the program to fail? 3. Modify the program to deal with these values 4. What result will we get if we run the program with values from question 2 and no modification from question 3? 5. Is it possible to answer question 1 without MOV command? Prove it!