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From: "vital.had at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/59666] IBM long double arithmetic results invalid in
 non-default rounding modes
Date: Mon, 01 May 2023 18:06:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D59666

Sergey Fedorov <vital.had at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vital.had at gmail dot com

--- Comment #8 from Sergey Fedorov <vital.had at gmail dot com> ---
(In reply to Vincent Lef=C3=A8vre from comment #1)
> (In reply to Joseph S. Myers from comment #0)
> It seems to be like that "by design" (though this is not satisfactory) and
> part of the ppc64 ABI for instance:
>=20
> http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#PREC
>=20
> "The software support is restricted to round-to-nearest mode. Programs th=
at
> use extended precision must ensure that this rounding mode is in effect w=
hen
> extended-precision calculations are performed."

Also true for AIX:
https://www.ibm.com/docs/sr/xcafbg/9.0.0?topic=3DSS3KZ4_9.0.0/com.ibm.xlf11=
1.bg.doc/xlfopg/fp-overview.html

Does anyone know whether this is also true for Darwin on PowerPC though?=