__const_hweight8

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#define __const_hweight16(w) (__const_hweight8(w) + __const_hweight8((w) >> 8 ))

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#define hweight8(w) (__builtin_constant_p(w) ? __const_hweight8(w) : __arch_hweight8(w))

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#define HWEIGHT8(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight8(w))

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#define __const_hweight16(w) (__const_hweight8(w) + __const_hweight8((w) >> 8 ))

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#define hweight8(w) (__builtin_constant_p(w) ? __const_hweight8(w) : __arch_hweight8(w))

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#define HWEIGHT8(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight8(w))