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6.8 128-bits integers

As an extension the integer scalar type __int128 is supported for targets having an integer mode wide enough to hold 128-bit. Simply write __int128 for a signed 128-bit integer, or unsigned __int128 for an unsigned 128-bit integer. There is no support in GCC to express an integer constant of type __int128 for targets having long long integer with less then 128 bit width.