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by tyfighter
705 days ago
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The BSF/BSR quirk is annoying, but I think there is a reason for it is that they were only thinking about it being used in a loop (or maybe an if) with something like: int mask = something;
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for (int index; _bit_scan_forward(&index, mask); mask ^= 1<<index) {
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} Since it sets the ZF on a zero input, they thought that must be all you need. But there are many other uses for (trailing|leading) zero count operations, and it would have been much better for them to just write the register anyway. |
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