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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/102989] Implement C2x's n2763 (_BitInt)
Date: Fri, 02 Jun 2023 10:43:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102989

--- Comment #54 from rguenther at suse dot de <rguenther at suse dot de> ---
On Fri, 2 Jun 2023, jakub at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102989
>=20
> Jakub Jelinek <jakub at gcc dot gnu.org> changed:
>=20
>            What    |Removed                     |Added
> -------------------------------------------------------------------------=
---
>   Attachment #55169|0                           |1
>         is obsolete|                            |
>=20
> --- Comment #53 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> Created attachment 55240
>   --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55240&action=3Dedit
> gcc14-bitint-wip.patch
>=20
> Further updates.  This introduces a new bitintlower (and bitintlower0) pa=
ss,
> categorizes
> _BitInt types into 4 categories (small, which are kept as is as they work=
 out
> of the box, middle, which have already more than one limb, but there exis=
ts
> DImode or TImode
> type which is supported and covers the precision, here lowering is done by
> casting to
> INTEGER_TYPE and back, large which is up to double that size (so it will =
be
> lowered to straight line code) and huge, which will use loops.  The lower=
ing is
> so far implemented for the middle _BitInts.
> Added some runtime testsuite coverage for the small and middle _BitInts (=
so on
> x86-64 up to 128 bits).

At least for -Os we probably want to consider moving everything but=20
small and maybe middle to out of line library functions?=