[Bug target/92168] New: Poor code generation for addcarry / subborrow

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92168

            Bug ID: 92168
           Summary: Poor code generation for addcarry / subborrow
           Product: gcc
           Version: 9.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dje at gcc dot gnu.org
  Target Milestone: ---
            Target: x86_64-*-*

Real World Technology reader reports poor GCC code generation relative to Clang
and MSVC for source code involving carry / borrow.

https://www.realworldtech.com/forum/?threadid=188061&curpostid=188061

with example at Compiler Explorer

https://godbolt.org/z/YYq6ou