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