Which is better option to use for dividing an integer number by 2?

Question

Which of the following techniques is the best option for dividing an integer by 2 and why?

Technique 1:

x = x >> 1;

Technique

Answer 1

I am telling for the purpose of programming competitions. Generally they have very large inputs where division by 2 takes place many times and its known that input is positive or negative.

x>>1 will be better than x/2. I checked on ideone.com by running a program where more than 10^10 division by 2 operations took place. x/2 took nearly 5.5s whereas x>>1 took nearly 2.6s for same program.