[Bug target/95750] [x86] Use dummy atomic insn instead of mfence in __atomic_thread_fence(seq_cst)

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95750

--- Comment #16 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Uros Bizjak <uros@gcc.gnu.org>:

https://gcc.gnu.org/g:8c7bb540803e8bff9998bc86806e8a83acc75370

commit r11-2306-g8c7bb540803e8bff9998bc86806e8a83acc75370
Author: Uros Bizjak <ubizjak@gmail.com>
Date:   Fri Jul 24 15:59:38 2020 +0200

    i386: Emit mfence_sse2 for -Os [PR95750]

    2020-07-24  Uroš Bizjak  <ubizjak@gmail.com>

    gcc/ChangeLog:
            PR target/95750
            * config/i386/sync.md (mmem_thread_fence): Emit mfence_sse2 for
-Os.