On Mon, 11 Nov 2024, Jakub Jelinek wrote:
> Hi!
>
> C23 roughly says that {d,D}{32,64,128} floating point constant suffixes
> are alternate spellings of {df,dd,dl} suffixes in annex H.
>
> So, the following patch allows that alternate spelling.
This is OK.
> Or is it intentional it isn't enabled and we need to do everything in
> there first before trying to define __STDC_IEC_60559_DFP__?
> Like add support for _Decimal32x and _Decimal64x types (including
> the d32x and d64x suffixes) etc.
It's reasonable to add support incrementally rather than needing to add
everything at once.
There is no such type as _Decimal32x, just _Decimal64x (required in Annex
H) and _Decimal128x (optional).
__STDC_IEC_60559_DFP__ is one of those predefined macros for a combination
of language and library features (i.e. one for stdc-predef.h, given both
language and library support - and libdfp, if that's what you use for DFP
features (see also
<https://sourceware.org/pipermail/libc-alpha/2019-September/106579.html>),
is a long way from supporting all of the features more recent than TR
24732:2009). It does not require Annex H features unless
__STDC_IEC_60559_TYPES__ is defined as well.
--
Joseph S. Myers
josmy...@redhat.com
