1 #ifndef _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ 2 #define _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ 3 4 /* 5 * Compile time versions of __arch_hweightN() 6 */ 7 #define __const_hweight8(w) \ 8 ((unsigned int) \ 9 ((!!((w) & (1ULL << 0))) + \ 10 (!!((w) & (1ULL << 1))) + \ 11 (!!((w) & (1ULL << 2))) + \ 12 (!!((w) & (1ULL << 3))) + \ 13 (!!((w) & (1ULL << 4))) + \ 14 (!!((w) & (1ULL << 5))) + \ 15 (!!((w) & (1ULL << 6))) + \ 16 (!!((w) & (1ULL << 7))))) 17 18 #define __const_hweight16(w) (__const_hweight8(w) + __const_hweight8((w) >> 8 )) 19 #define __const_hweight32(w) (__const_hweight16(w) + __const_hweight16((w) >> 16)) 20 #define __const_hweight64(w) (__const_hweight32(w) + __const_hweight32((w) >> 32)) 21 22 /* 23 * Generic interface. 24 */ 25 #define hweight8(w) (__builtin_constant_p(w) ? __const_hweight8(w) : __arch_hweight8(w)) 26 #define hweight16(w) (__builtin_constant_p(w) ? __const_hweight16(w) : __arch_hweight16(w)) 27 #define hweight32(w) (__builtin_constant_p(w) ? __const_hweight32(w) : __arch_hweight32(w)) 28 #define hweight64(w) (__builtin_constant_p(w) ? __const_hweight64(w) : __arch_hweight64(w)) 29 30 /* 31 * Interface for known constant arguments 32 */ 33 #define HWEIGHT8(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight8(w)) 34 #define HWEIGHT16(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight16(w)) 35 #define HWEIGHT32(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight32(w)) 36 #define HWEIGHT64(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight64(w)) 37 38 /* 39 * Type invariant interface to the compile time constant hweight functions. 40 */ 41 #define HWEIGHT(w) HWEIGHT64((u64)w) 42 43 #endif /* _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ */ 44