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5270 | serge | 1 | #ifndef _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ |
2 | #define _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ |
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3 | |||
4 | /* |
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5 | * Compile time versions of __arch_hweightN() |
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6 | */ |
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7 | #define __const_hweight8(w) \ |
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8 | ((unsigned int) \ |
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9 | ((!!((w) & (1ULL << 0))) + \ |
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10 | (!!((w) & (1ULL << 1))) + \ |
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11 | (!!((w) & (1ULL << 2))) + \ |
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12 | (!!((w) & (1ULL << 3))) + \ |
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13 | (!!((w) & (1ULL << 4))) + \ |
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14 | (!!((w) & (1ULL << 5))) + \ |
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15 | (!!((w) & (1ULL << 6))) + \ |
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16 | (!!((w) & (1ULL << 7))))) |
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17 | |||
18 | #define __const_hweight16(w) (__const_hweight8(w) + __const_hweight8((w) >> 8 )) |
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19 | #define __const_hweight32(w) (__const_hweight16(w) + __const_hweight16((w) >> 16)) |
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20 | #define __const_hweight64(w) (__const_hweight32(w) + __const_hweight32((w) >> 32)) |
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21 | |||
22 | /* |
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23 | * Generic interface. |
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24 | */ |
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25 | #define hweight8(w) (__builtin_constant_p(w) ? __const_hweight8(w) : __arch_hweight8(w)) |
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26 | #define hweight16(w) (__builtin_constant_p(w) ? __const_hweight16(w) : __arch_hweight16(w)) |
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27 | #define hweight32(w) (__builtin_constant_p(w) ? __const_hweight32(w) : __arch_hweight32(w)) |
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28 | #define hweight64(w) (__builtin_constant_p(w) ? __const_hweight64(w) : __arch_hweight64(w)) |
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29 | |||
30 | /* |
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31 | * Interface for known constant arguments |
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32 | */ |
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33 | #define HWEIGHT8(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight8(w)) |
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34 | #define HWEIGHT16(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight16(w)) |
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35 | #define HWEIGHT32(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight32(w)) |
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36 | #define HWEIGHT64(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight64(w)) |
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37 | |||
38 | /* |
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39 | * Type invariant interface to the compile time constant hweight functions. |
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40 | */ |
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41 | #define HWEIGHT(w) HWEIGHT64((u64)w) |
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42 | |||
43 | #endif /* _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ */><>><>><>><>><>><>><>><> |