__buildin_expect and if condition behaviour

• I wonder how they achieved || functionality with (&& and unlikely) in the below piece of code.

if (unlikely(!arch_get_random_seed_long(&v)) && unlikely(!arch_get_random_long(&v))) {                break;   }

• As per design, if arch_get_random_seed_long gets value &v there is no need to fill the value again in arch_get_random_long(). This piece of code working fine.

• But, how do 'unlikely' achieve this. Skipping the remaining code after && once [unlikely(!0)] is achieved.

Thanks,Paavaanan