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28 lines
535 B
C
28 lines
535 B
C
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#ifdef __GNUC__
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static IFT ifilter_bitsum(IFT x)
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{
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if (sizeof(IFT) == 16)
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return (((IFT) 1) <<
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(__builtin_popcountll((unsigned long long) (x >> (sizeof(IFT) * 8 / 2))) +
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__builtin_popcountll((unsigned long long) x))) - 1;
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if (sizeof(IFT) == 8)
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return (((IFT) 1) << __builtin_popcountll((unsigned long long) x)) - 1;
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return (((IFT) 1) << __builtin_popcount((unsigned int) x)) - 1;
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}
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#else
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static IFT ifilter_bitsum(IFT x)
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{
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int v = 0;
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while (x != 0) {
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x &= x - 1;
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v++;
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}
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return (((IFT) 1) << v) - 1;
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}
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#endif
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