[thirdparty/gcc.git] / gcc / doc / gcc / extensions-to-the-c-language-family / 128-bit-integers.rst

..
  Copyright 1988-2022 Free Software Foundation, Inc.
  This is part of the GCC manual.
  For copying conditions, see the copyright.rst file.

.. index:: __int128 data types

.. _int128:

128-bit Integers
****************

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.
Commit	Line	Data
c63539ff ML	1	..
	2	Copyright 1988-2022 Free Software Foundation, Inc.
	3	This is part of the GCC manual.
	4	For copying conditions, see the copyright.rst file.
	5
	6	.. index:: __int128 data types
	7
	8	.. _int128:
	9
	10	128-bit Integers
	11	****************
	12
	13	As an extension the integer scalar type ``__int128`` is supported for
	14	targets which have an integer mode wide enough to hold 128 bits.
	15	Simply write ``__int128`` for a signed 128-bit integer, or
	16	``unsigned __int128`` for an unsigned 128-bit integer. There is no
	17	support in GCC for expressing an integer constant of type ``__int128``
3ed1b4ce	18	for targets with ``long long`` integer less than 128 bits wide.