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Good code is its own best documentation. As you're about to add a comment, ask yourself, 'How can I improve the code so that this comment isn't needed?' Improve the code and then document it to make it even clearer. |
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Just as one example, the compiler can assume that the carry flag is clear after an unsigned addition and go and do some optimizations based on that. If you have just done a 2's complement addition the carry flag could be set leading to undefined behavior.
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