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<a name="g_t128_002dbit-Integers"></a>
<h3 class="section">6.9 128-bit Integers</h3>
<a name="index-_005f_005fint128-data-types"></a>

<p>As an extension the integer scalar type <code>__int128</code> is supported for
targets which have an integer mode wide enough to hold 128 bits.
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 for expressing an integer constant of type <code>__int128</code>
for targets with <code>long long</code> integer less than 128 bits wide.
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