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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/79173] add-with-carry and subtract-with-borrow support
 (x86_64 and others)
Date: Sun, 15 Nov 2020 21:32:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D79173

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Michael_S from comment #5)
> I agree with regard to "other targets", first of all, aarch64, but x86_64
> variant of gcc already provides requested functionality in for of
> _subborrow_u64 () and _addcarry_u64() intrinsic functions.
> The problem here is not lack of functionality, but very poor implementati=
on
> (mentioned many times on bugzilla with minimal effect).
> In that regard gcc is more than decade behind MSVC and ~4 years behind
> clang/llvm. Surprisingly, icc is also quite bad.

Are you sure you have tested gcc trunk?
There have been fixes for this a month ago as part of PR97387 fixes.=