[Bug target/81316] New: Missing memory side effect on __atomic_store

[mfcc64 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81316

            Bug ID: 81316
           Summary: Missing memory side effect on __atomic_store
           Product: gcc
           Version: 6.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mfcc64 at gmail dot com
  Target Milestone: ---

Created attachment 41679
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41679&action=edit
Testcase

Missing memory side effect on __atomic_store using __ATOMIC_RELEASE.

How to reproduce (atomic-fail.c attached):
gcc atomic-fail.c -O2 -pthread -o atomic-fail
./atomic-fail
Error: val != 1, missing memory side effect.


The bug is not reproduced with __atomic_store using __ATOMIC_SEQ_CST. Probably
this is similar to Bug80640.