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use BMI2's bzhi for rank calculation #382

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use BMI2's bzhi for rank calculation #382

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8 changes: 7 additions & 1 deletion include/sdsl/rank_support.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -147,7 +147,13 @@ struct rank_support_trait<1,1> {

static uint32_t word_rank(const uint64_t* data, size_type idx)
{
return bits::cnt(*(data+(idx>>6)) & bits::lo_set[idx&0x3F]);
#ifdef __BMI2__
return bits::cnt(
_bzhi_u64(data[idx>>6], idx&0x3F)
);
#else
return bits::cnt(*(data+(idx>>6)) & bits::lo_set[idx&0x3F]);
#endif
}

static uint32_t full_word_rank(const uint64_t* data, size_type idx)
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