/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ #define _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ /* * Compile time versions of __arch_hweightN() */ #define __const_hweight8(w) \ ((unsigned int) \ ((!!((w) & (1ULL << 0))) + \ (!!((w) & (1ULL << 1))) + \ (!!((w) & (1ULL << 2))) + \ (!!((w) & (1ULL << 3))) + \ (!!((w) & (1ULL << 4))) + \ (!!((w) & (1ULL << 5))) + \ (!!((w) & (1ULL << 6))) + \ (!!((w) & (1ULL << 7))))) #define __const_hweight16(w) (__const_hweight8(w) + __const_hweight8((w) >> 8 )) #define __const_hweight32(w) (__const_hweight16(w) + __const_hweight16((w) >> 16)) #define __const_hweight64(w) (__const_hweight32(w) + __const_hweight32((w) >> 32)) /* * Generic interface. */ #define hweight8(w) (__builtin_constant_p(w) ? __const_hweight8(w) : __arch_hweight8(w)) #define hweight16(w) (__builtin_constant_p(w) ? __const_hweight16(w) : __arch_hweight16(w)) #define hweight32(w) (__builtin_constant_p(w) ? __const_hweight32(w) : __arch_hweight32(w)) #define hweight64(w) (__builtin_constant_p(w) ? __const_hweight64(w) : __arch_hweight64(w)) /* * Interface for known constant arguments */ #define HWEIGHT8(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight8(w)) #define HWEIGHT16(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight16(w)) #define HWEIGHT32(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight32(w)) #define HWEIGHT64(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight64(w)) /* * Type invariant interface to the compile time constant hweight functions. */ #define HWEIGHT(w) HWEIGHT64((u64)w) #endif /* _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ */