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Since Ryu has the alias uint128_t for this same purpose, it seems best for us to use this name as well, so as to minimize the amount of local modifications we'd need to make to our copy of Ryu. (In a subsequent patch, we're going to remove Ryu's aliases so that it uses this one defined in floating_to_chars.cc.) libstdc++-v3/ChangeLog: * src/c++17/floating_to_chars.cc (uint128_t): New conditionally defined alias of unsigned __int128. (floating_type_traits_binary128::mantissa_t): Use uint128_t instead of unsigned __int128. (floating_type_traits<long double>::mantissa_t) [LONG_DOUBLE_KIND == LDK_IBM128]: Likewise. (get_ieee_repr): Likewise. Make casts from uint_t to mantissa_t and uint32_t explicit. Simplify the extraction of mantissa, exponent and sign bit.
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