[Bug target/86019] [8/9 Regression] Unref implementation using atomic_thread_fence generates worse code on x86-64 in gcc 8.1 than 7.3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86019

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
                URL|missed-optimization         |
      Known to work|                            |7.3.0
            Version|unknown                     |8.1.0
   Target Milestone|---                         |8.2
            Summary|Unref implementation using  |[8/9 Regression] Unref
                   |atomic_thread_fence         |implementation using
                   |generates worse code on     |atomic_thread_fence
                   |x86-64 in gcc 8.1 than 7.3  |generates worse code on
                   |                            |x86-64 in gcc 8.1 than 7.3