gcc: __int128

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1 6.8 128-bit Integers
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1 As an extension the integer scalar type '__int128' is supported for
1 targets which have an integer mode wide enough to hold 128 bits.  Simply
1 write '__int128' for a signed 128-bit integer, or 'unsigned __int128'
1 for an unsigned 128-bit integer.  There is no support in GCC for
1 expressing an integer constant of type '__int128' for targets with 'long
1 long' integer less than 128 bits wide.
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