HyperLogLogRank.h File Reference

#include "../Shared/funcannotations.h"

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Functions
FORCE_INLINE uint8_t	get_rank (uint64_t x, uint32_t b)

Function Documentation

FORCE_INLINE uint8_t get_rank	(	uint64_t	x,
		uint32_t	b
	)

Definition at line 30 of file HyperLogLogRank.h.

Referenced by agg_approximate_count_distinct(), agg_approximate_count_distinct_gpu(), and approximate_distinct_tuples_impl().

                                                      {
#ifdef _MSC_VER
  return std::min(b, static_cast<uint32_t>(x ? __lzcnt64(x) : 64)) + 1;
#else
  return std::min(b, static_cast<uint32_t>(x ? __builtin_clzl(x) : 64)) + 1;
#endif
}

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