| POPCOUNT(3) | Library Functions Manual | POPCOUNT(3) | 
popcount, popcountl,
  popcountll, popcount32,
  popcount64 —
#include <strings.h>
unsigned int
  
  popcount(unsigned
    int value);
unsigned int
  
  popcountl(unsigned
    long value);
unsigned int
  
  popcountll(unsigned
    long long value);
#include
    <stdint.h>
unsigned int
  
  popcount32(uint32_t
    value);
unsigned int
  
  popcount64(uint64_t
    value);
popcount functions return the number of bits set in
  value.
popcount(), popcountl(),
  popcountll(), popcount32(),
  and popcount64() functions appeared in
  NetBSD 6.0.
| August 22, 2011 | NetBSD 9.4 |