[power-ieee128] OPEN CONV

[Jakub Jelinek <jakub@redhat.com>]

On Thu, Jan 06, 2022 at 09:01:54PM +0100, Thomas Koenig wrote:
> 
> On 06.01.22 06:00, Michael Meissner via Fortran wrote:
> What is still missing is the conversion for unformatted I/O, both
> ways.  I'll start doing some stuff on it. Just one question:
> What are functions that I can use to convert from IBM long double
> to IEEE and long double and vice versa?  It was in an e-mail somewhere,
> but I cannot find it at the moment.

So, what's the plan for that?
Can't find CONVERT= in Fortran 2018, so I assume it is a non-standard
extension,
https://www.intel.com/content/www/us/en/develop/documentation/fortran-compiler-oneapi-dev-guide-and-reference/top/language-reference/file-operation-i-o-statements/open-statement-specifiers/open-convert-specifier.html#open-convert-specifier
documents the Intel one and we accept
CONVERT='native'
CONVERT='swap'
CONVERT='big_endian'
CONVERT='little_endian'
Now, I suppose for powerpc64le we want to add
some more, but the question is how they play together
with the byteswapping and how to name them, so that
it is clear they talk about REAL/COMPLEX KIND=16 format
and nothing else.  Can we (or do we) want to allow
multiple comma separated strings from the orthogonal
choices, like
CONVERT='big_endian,ibm_extended'
CONVERT='swap,ieee_extended'
or add ibm_extended, ieee_extended and strings that
combine those with swap, big_endian and little_endian
ibm_extended_swap, ieee_extended_little etc.?

	Jakub