1<html lang="en"> 2<head> 3<title>__int128 - Using the GNU Compiler Collection (GCC)</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Using the GNU Compiler Collection (GCC)"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="C-Extensions.html#C-Extensions" title="C Extensions"> 9<link rel="prev" href="Long-Long.html#Long-Long" title="Long Long"> 10<link rel="next" href="Complex.html#Complex" title="Complex"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<!-- 13Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 141998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 152010 Free Software Foundation, Inc. 16 17Permission is granted to copy, distribute and/or modify this document 18under the terms of the GNU Free Documentation License, Version 1.3 or 19any later version published by the Free Software Foundation; with the 20Invariant Sections being ``Funding Free Software'', the Front-Cover 21Texts being (a) (see below), and with the Back-Cover Texts being (b) 22(see below). A copy of the license is included in the section entitled 23``GNU Free Documentation License''. 24 25(a) The FSF's Front-Cover Text is: 26 27 A GNU Manual 28 29(b) The FSF's Back-Cover Text is: 30 31 You have freedom to copy and modify this GNU Manual, like GNU 32 software. Copies published by the Free Software Foundation raise 33 funds for GNU development.--> 34<meta http-equiv="Content-Style-Type" content="text/css"> 35<style type="text/css"><!-- 36 pre.display { font-family:inherit } 37 pre.format { font-family:inherit } 38 pre.smalldisplay { font-family:inherit; font-size:smaller } 39 pre.smallformat { font-family:inherit; font-size:smaller } 40 pre.smallexample { font-size:smaller } 41 pre.smalllisp { font-size:smaller } 42 span.sc { font-variant:small-caps } 43 span.roman { font-family:serif; font-weight:normal; } 44 span.sansserif { font-family:sans-serif; font-weight:normal; } 45--></style> 46<link rel="stylesheet" type="text/css" href="../cs.css"> 47</head> 48<body> 49<div class="node"> 50<a name="__int128"></a> 51<a name="g_t_005f_005fint128"></a> 52<p> 53Next: <a rel="next" accesskey="n" href="Complex.html#Complex">Complex</a>, 54Previous: <a rel="previous" accesskey="p" href="Long-Long.html#Long-Long">Long Long</a>, 55Up: <a rel="up" accesskey="u" href="C-Extensions.html#C-Extensions">C Extensions</a> 56<hr> 57</div> 58 59<h3 class="section">6.8 128-bits integers</h3> 60 61<p><a name="index-g_t_0040code_007b_005f_005fint128_007d-data-types-2275"></a> 62As an extension the integer scalar type <code>__int128</code> is supported for 63targets having an integer mode wide enough to hold 128-bit. 64Simply write <code>__int128</code> for a signed 128-bit integer, or 65<code>unsigned __int128</code> for an unsigned 128-bit integer. There is no 66support in GCC to express an integer constant of type <code>__int128</code> 67for targets having <code>long long</code> integer with less then 128 bit width. 68 69 </body></html> 70 71