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bmi2 codepath for nthsetbit #171

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Sopel97 opened this issue Apr 3, 2022 · 0 comments

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Sopel97 commented Apr 3, 2022

https://github.com/glinscott/nnue-pytorch/blob/7d47cad764a95d4ad69f1b14a4a0722f1db63911/lib/nnue_training_data_formats.h#L264

revoof on discord suggested:

nthSetBitIndex could be _tzcnt_u64(_pdep_u64(1ULL << n, v)) if fast bmi2 is available

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