| Using the GNU Compiler Collection (GCC): __int128 |
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As an extension the integer scalar type __int128 is supported for
targets which have an integer mode wide enough to hold 128 bits.
Simply write __int128 for a signed 128-bit integer, or
unsigned __int128 for an unsigned 128-bit integer. There is no
support in GCC for expressing an integer constant of type __int128
for targets with long long integer less than 128 bits wide.