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by volta87
1971 days ago
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The article touches on this, since its an important realization. In C, however, if the integers are not unsigned, the add/sub version exhibits UB on overflow, because C unnecessarily ties signed/unsignedness with overflow behavior (UB, two's complement, etc.). Not that this is important, but could hint why this trick is more often shown with XOR than with add/sub. |
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