mapleFU commented on PR #39403:
URL: https://github.com/apache/arrow/pull/39403#issuecomment-1873378808
Oh I think I've found the reason...
```c++
uint64_t TrailingBits2(uint64_t v, int num_bits) {
if (__builtin_expect(num_bits == 0, 0)) return 0;
if (__builtin_expect(num_bits >= 64, 0)) return v;
return ((v >> num_bits) << num_bits) ^ v;
}
```
Also generate `bzhi`. Seems we need rethink the problem here:
https://github.com/apache/arrow/pull/39403#discussion_r1439035783
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