1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ 3*4882a593Smuzhiyun #define _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun /* 6*4882a593Smuzhiyun * Compile time versions of __arch_hweightN() 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun #define __const_hweight8(w) \ 9*4882a593Smuzhiyun ((unsigned int) \ 10*4882a593Smuzhiyun ((!!((w) & (1ULL << 0))) + \ 11*4882a593Smuzhiyun (!!((w) & (1ULL << 1))) + \ 12*4882a593Smuzhiyun (!!((w) & (1ULL << 2))) + \ 13*4882a593Smuzhiyun (!!((w) & (1ULL << 3))) + \ 14*4882a593Smuzhiyun (!!((w) & (1ULL << 4))) + \ 15*4882a593Smuzhiyun (!!((w) & (1ULL << 5))) + \ 16*4882a593Smuzhiyun (!!((w) & (1ULL << 6))) + \ 17*4882a593Smuzhiyun (!!((w) & (1ULL << 7))))) 18*4882a593Smuzhiyun 19*4882a593Smuzhiyun #define __const_hweight16(w) (__const_hweight8(w) + __const_hweight8((w) >> 8 )) 20*4882a593Smuzhiyun #define __const_hweight32(w) (__const_hweight16(w) + __const_hweight16((w) >> 16)) 21*4882a593Smuzhiyun #define __const_hweight64(w) (__const_hweight32(w) + __const_hweight32((w) >> 32)) 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun /* 24*4882a593Smuzhiyun * Generic interface. 25*4882a593Smuzhiyun */ 26*4882a593Smuzhiyun #define hweight8(w) (__builtin_constant_p(w) ? __const_hweight8(w) : __arch_hweight8(w)) 27*4882a593Smuzhiyun #define hweight16(w) (__builtin_constant_p(w) ? __const_hweight16(w) : __arch_hweight16(w)) 28*4882a593Smuzhiyun #define hweight32(w) (__builtin_constant_p(w) ? __const_hweight32(w) : __arch_hweight32(w)) 29*4882a593Smuzhiyun #define hweight64(w) (__builtin_constant_p(w) ? __const_hweight64(w) : __arch_hweight64(w)) 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun /* 32*4882a593Smuzhiyun * Interface for known constant arguments 33*4882a593Smuzhiyun */ 34*4882a593Smuzhiyun #define HWEIGHT8(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight8(w)) 35*4882a593Smuzhiyun #define HWEIGHT16(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight16(w)) 36*4882a593Smuzhiyun #define HWEIGHT32(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight32(w)) 37*4882a593Smuzhiyun #define HWEIGHT64(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight64(w)) 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun /* 40*4882a593Smuzhiyun * Type invariant interface to the compile time constant hweight functions. 41*4882a593Smuzhiyun */ 42*4882a593Smuzhiyun #define HWEIGHT(w) HWEIGHT64((u64)w) 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun #endif /* _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ */ 45