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