Can I use bitwise operators instead of logical ones?

Question

Bitwise operators work on bits, logical operators evaluate boolean expressions. As long as expressions return bool, why don\'t we use bitwise operators instead

Answer 1

Even if you achieve the same result with the bit-wise operator, it's better to use logical operator here due to performance reason.

In expression (age < 0) || (age > 100) second condition (age > 100) will be calculated only if (age < 0) is false. For such expression compiler produce code like this:

cmpl   $0x0,-0x4(%rbp)                 
js     1004010f9   // <-- Skip right expr evaluation if left true
cmpl   $0x64,-0x4(%rbp)               
jle    100401100 

|| doesn't produce any extra branching to be able to skip second expression evaluation.