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  • math - What does the ^ (XOR) operator do? - Stack Overflow
    The XOR ( ^) is an logical operator that will return 1 when the bits are different and 0 elsewhere A negative number is stored in binary as two's complement In 2's complement, The leftmost bit position is reserved for the sign of the value (positive or negative) and doesn't contribute towards the value of number
  • Logical XOR operator in C++? - Stack Overflow
    Proper manual logical XOR implementation depends on how closely you want to mimic the general behavior of other logical operators (|| and ) with your XOR There are two important things about these operators: 1) they guarantee short-circuit evaluation, 2) they introduce a sequence point, 3) they evaluate their operands only once
  • What does bitwise XOR (exclusive OR) mean? - Stack Overflow
    So, if you XOR a number onto itself, you always get 0 (believe it or not, but that property of XOR has been used by compilers, when a 0 needs to be loaded into a CPU register It's faster to perform a bit operation than to explicitly push 0 into a register The compiler will just produce assembly code to XOR a register onto itself)
  • Fast XOR of multiple integers - Code Review Stack Exchange
    (Proof sketch: Let the bitwise XOR of all inputs except the last one be A, and let the desired output be C Now, for any A and C, we can choose the last input value to be B = A ⊕ C, which implies A ⊕ B = C Also, since the XOR operation is commutative and associative, the order of the inputs does not matter )
  • Speed optimization for block XOR - Code Review Stack Exchange
    Then you would use the appropriate xor-instruction and store the result So 2 loads, 1 xor and 1 store for 16 bytes (or even more using AVX) I would expect this code to be memory-bound, probably even if you are not using SIMD instructions Depending on your target-hardware, you could also try to use more threads otherwise
  • 如何理解「异或（XOR）」运算在计算机科学中的重要性？ - 知乎
    xor 运算有一个很奇妙的特点：如果对一个值连续做两次 xor，会返回这个值本身。 第一次 XOR 1010 ^ 1111 0101 第二次 XOR 0101 ^ 1111 1010 上面代码中，原始值是1010，再任意选择一个值（上例是1111），做两次 XOR，最后总是会得到原始值1010。
  • XOR Encryption, Decryption, and Cracking in Python
    As five of the first six challenges are XOR related problems I thought it would be a good idea to compile my work into a single program capable of encrypting, decrypting, and cracking using the XOR cipher The program is capable of both single-byte and multi-byte encryption modes and can employ statistical analysis to guess a key when none is
  • 怎么用最少的mosfet完成异或运算？ - 知乎
    都是n沟道增强型MOSFET我现在只能想到一个用8个mosfet完成异或运算的方法，觉得还是太多了。





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