On Sat, Jan 8, 2022 at 1:59 PM Michael Meissner <meiss...@linux.ibm.com> wrote: > > On Sat, Jan 08, 2022 at 03:18:07PM +0100, Jakub Jelinek wrote: > > On Sat, Jan 08, 2022 at 03:13:10PM +0100, Thomas Koenig wrote: > > > > > > On 08.01.22 15:02, Jakub Jelinek via Fortran wrote: > > > > Note, as for byteswapping, apparently it wasn't ever working right fox > > > > the IBM extended real(kind=16) and complex(kind=16). > > > > > > The lack of bug reports since the conversion feature was introduced in > > > 2006, more than 15 years ago, tells us something, I guess... > > > > powerpc64le was only introduced in GCC 4.8 in 2013, so slightly less > > than that, but still. > > Either nobody interchanges/shares fortran unformatted data between > > powerpc big and little endian, or if they do, they don't use real(kind=16) > > or complex(kind=16) in there... > > I still wish I had had the forethought when we were setting up the LE ABI to > change the default 128-bit format to IEEE instead of IBM. But alas, I didn't. > You would still need converters between the big endian IBM format and little > endian IEEE format, but it would have avoided a lot of the problems where GCC > assumes there is only one floating point format for each size.
Mike, The LE ABI initial target was Power8 and IEEE128 hardware support was added to Power9. The ABI was a conscious decision. IEEE 128 was not a viable requirement for the LE ABI at the time of the transition. Thanks, David
