[Bug rtl-optimization/97387] we are near 2021, add carry intrinsic still does the wrong thing and generates silly code.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97387

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-10-13

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
I guess the best way forward is to create sth like .ADD_OVERFLOW for
add-with-carry and open-code those intrinsics in a form we can recognize.

Obviously there seems to be pieces on RTL missing since the x86 builtin
should better expand to (generic!) RTL that can be recognized by adc patterns.