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Add popcount for 64bit ints

This commit is contained in:
Behdad Esfahbod 2017-10-15 16:00:09 +02:00
parent 473b17af4d
commit 6fb4ac73f9
1 changed files with 12 additions and 0 deletions
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12
src/hb-private.hh
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@ -333,6 +333,18 @@ _hb_popcount32 (uint32_t mask)
return (((y + (y >> 3)) & 030707070707) % 077); return (((y + (y >> 3)) & 030707070707) % 077);
#endif #endif
} }
static inline HB_CONST_FUNC unsigned int
_hb_popcount64 (uint64_t mask)
{
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
return __builtin_popcountl (mask);
#else
return _hb_popcount32 (mask) + _hb_popcount32 (mask >> 32);
#endif
}
template <typename T> static inline unsigned int _hb_popcount (T mask);
template <> inline unsigned int _hb_popcount<uint32_t> (uint32_t mask) { return _hb_popcount32 (mask); }
template <> inline unsigned int _hb_popcount<uint64_t> (uint64_t mask) { return _hb_popcount64 (mask); }
/* Returns the number of bits needed to store number */ /* Returns the number of bits needed to store number */
static inline HB_CONST_FUNC unsigned int static inline HB_CONST_FUNC unsigned int