[Bug middle-end/79173] add-with-carry and subtract-with-borrow support (x86_64 and others)

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79173

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=97387
          Component|target                      |middle-end

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
x86 has _addcarry_u64 which gets it mostly (see PR 97387).

The clang builtins __builtin_*_overflow are there but not the __builtin_add*
builtins.

GCC does do a decent job of optimizing the original code now too.