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<title>__int128 - Using the GNU Compiler Collection (GCC)</title>
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<h3 class="section">6.8 128-bits integers</h3>
<p><a name="index-g_t_0040code_007b_005f_005fint128_007d-data-types-2370"></a>
As an extension the integer scalar type <code>__int128</code> is supported for
targets having an integer mode wide enough to hold 128-bit.
Simply write <code>__int128</code> for a signed 128-bit integer, or
<code>unsigned __int128</code> for an unsigned 128-bit integer. There is no
support in GCC to express an integer constant of type <code>__int128</code>
for targets having <code>long long</code> integer with less then 128 bit width.
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