On Sun, 11 Feb 2024, 20:54 Thiago Macieira via Std-Proposals, <std-proposals@lists.isocpp.org> wrote:
On Sunday, 11 February 2024 11:02:14 PST Jonathan Wakely wrote:
> I should also note that current GCC trunk still has no support for _BitInt
> (that I can see).
> As Jan already said, it supports it fully.

Not the one Matt has on Godbolt:

Note the -m32

I don't think anything except the x86_64 psABI has specified how to represent _BitInt yet.