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