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This implements a minimal integer class type that emulates 128-bit unsigned arithmetic using a pair of 64-bit integers, which the floating-point std::to_chars implementation then uses as a drop-in replacement for unsigned __int128 on targets that lack the latter. After this patch, we now fully support formatting of large long double types on such targets. Since Ryu performs 128-bit division/modulus only by 2, 5 and 10, this integer class type supports only these divisors rather than general division/modulus. libstdc++-v3/ChangeLog: * src/c++17/floating_to_chars.cc: Simplify the file as if __SIZEOF_INT128__ is always defined. [!defined __SIZEOF_INT128__]: Include "uint128_t.h". Define a base-10 to_chars overload for the uint128_t class type. * src/c++17/uint128_t.h: New file. * testsuite/20_util/to_chars/long_double.cc: No longer expect an execution FAIL on targets that have a large long double type but lack __int128.
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