[Bug target/93141] Missed optimization : Use of adc when checking overflow

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93141

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2020-01-03
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47589
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47589&action=edit
gcc10-pr93141.patch

Untested patch that improves double-word __builtin_add_overflow and thus also
the original testcase too.  __builtin_sub_overflow is for next week.