Contents
How do I optimize XOR?
A Better Solution can find XOR without using loop.
- Find bitwise OR of x and y (Result has set bits where either x has set or y has set bit).
- To remove extra set bits find places where both x and y have set bits.
- bitwise AND of “(x | y)” and “~x | ~y” produces the required result.
What is the fastest way to get XOR?
To find each bit of XOR just calculate number of 1’s in the corresponding bits. If it is even or zero then that XOR’ed bit is 0. If it is odd then that XOR’ed bit is 1.
Is XOR faster than addition?
It depends when and what you are comparing! Suppose, if you just want to add 1 to any number then addition operator will be fast than doing it by bitwise operation. So it totally depends on situation. Even to swap two numbers bitwise xor is supposedly the fast method you may have heard.
What is XOR in algorithm?
In computer programming, the exclusive or swap (sometimes shortened to XOR swap) is an algorithm that uses the exclusive or bitwise operation to swap the values of two variables without using the temporary variable which is normally required.
What is maximum XOR value?
Bit representation of 1 = 001. Now, you can see that after selecting as much numbers you want and selecting any of them you can not obtain XOR value greater than 111 i.e 7. So, for a given n and k >1 the maximum possible XOR value is 2log2(n)+1-1 (that is the value when all bits of n are turned to 1). Java.
Is XOR operation costly?
The exclusive-or operation is widely used in cryptography. The same XOR function can be used for both encryption and decryption. Also, XOR operation has low computational cost.
Is XOR faster?
Likewise non-x86 variable instruction length processors that require the zero to be encoded in the instruction will also require a longer instruction, longer fetch time, more cache consumed if there is a cache, etc. So the xor is faster (usually, depends on how it encodes).
Why is XOR not secure?
The problem with XOR encryption is that for long runs of the same characters, it is very easy to see the password. Such long runs are most commonly spaces in text files. Say your password is 8 chars, and the text file has 16 spaces in some line (for example, in the middle of ASCII-graphics table).