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From: "meissner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99197] Built-ins for packing/unpacking __ibm128 not
 documented
Date: Tue, 15 Feb 2022 00:17:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99197

Michael Meissner <meissner at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |meissner at gcc dot gnu.org
         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
These functions have been documented since June 2018.  The file extend.texi
contains:

The @code{__builtin_unpack_ibm128} function takes a @code{__ibm128}
argument and a compile time constant of 0 or 1.  If the constant is 0,
the first @code{double} within the @code{__ibm128} is returned,
otherwise the second @code{double} is returned.

The @code{__builtin_pack_ibm128} function takes two @code{double}
arguments and returns a @code{__ibm128} value that combines the two
arguments.=