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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/101104] test case gcc.c-torture/execute/ieee/cdivchkld.c
 fails
Date: Tue, 20 Jul 2021 22:46:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101104

Segher Boessenkool <segher at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |segher at gcc dot gnu.org
          Component|testsuite                   |target

--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Patrick McGehearty from comment #1)
> I identified the root cause as not fully understanding the IBM native
> format. The gcc internal representation uses KF mode for IBM 128-bit
> floating point.

KFmode is IEEE QP float.  IFmode is double-double, "IBM extended double",
a pair of DP float numbers (with some rules, not every pair is valid).

TFmode is one of those.=