Check for __GNUC__ definition
Wrap code checking against __GNUC__ to ensure it is defined. This can cause errors with compilers which do not define this preprocessor value.
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@ -259,7 +259,7 @@ private:
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if (low < k)
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(*outHigh)++;
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return low;
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#elif (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) && defined(__x86_64__)
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#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) && defined(__x86_64__)
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__extension__ typedef unsigned __int128 uint128;
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uint128 p = static_cast<uint128>(a) * static_cast<uint128>(b);
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p += k;
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@ -79,7 +79,7 @@ struct DiyFp {
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if (l & (uint64_t(1) << 63)) // rounding
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h++;
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return DiyFp(h, e + rhs.e + 64);
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#elif (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) && defined(__x86_64__)
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#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) && defined(__x86_64__)
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__extension__ typedef unsigned __int128 uint128;
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uint128 p = static_cast<uint128>(f) * static_cast<uint128>(rhs.f);
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uint64_t h = static_cast<uint64_t>(p >> 64);
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