diff options
| -rw-r--r-- | include/cutils/bitops.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/cutils/bitops.h b/include/cutils/bitops.h index eb44236..c26dc54 100644 --- a/include/cutils/bitops.h +++ b/include/cutils/bitops.h @@ -75,6 +75,16 @@ static inline int bitmask_ffz(unsigned int *bitmask, int num_bits) return -1; } +static inline int bitmask_weight(unsigned int *bitmask, int num_bits) +{ + int i; + int weight = 0; + + for (i = 0; i < BITS_TO_WORDS(num_bits); i++) + weight += __builtin_popcount(bitmask[i]); + return weight; +} + static inline void bitmask_set(unsigned int *bitmask, int bit) { bitmask[BIT_WORD(bit)] |= BIT_MASK(bit); |