[Bug target/59666] IBM long double arithmetic results invalid in non-default rounding modes

[vincent-gcc at vinc17 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59666

--- Comment #7 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to joseph@codesourcery.com from comment #6)
> There are no such requirements in ISO C for non-IEEE types;

The standard says nowhere that the rounding directions that are provided by the
implementation apply only to IEEE types. It even explicitly says that there may
be additional implementation-defined rounding directions, thus not related to
IEEE at all!