[Bug tree-optimization/78810] [7 Regression] Optimized out volatile memory access

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78810

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |trippels at gcc dot gnu.org
         Resolution|---                         |INVALID

--- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
They invoke undefined behavior by using misaligned accesses, see:
https://bugs.ruby-lang.org/issues/11831

It was fixed once, but they dropped the fix in the current versions.