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_ */

 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_ */