[Bug target/55981] std::atomic store is split in two smaller stores

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55981

--- Comment #9 from Uros Bizjak <ubizjak at gmail dot com> 2013-01-15 19:39:20 UTC ---
(In reply to comment #4)
> (In reply to comment #2)
> > Btw, the same happens if atomic is replaced with "volatile unsigned long y" -
> > which does not violate the standard, but may be considered undesirable by some.
> > I don't have a strong opinion about this.
> 
> This really does need to be fixed in the "volatile unsigned long y" case, or
> device drivers storing constants to device registers will break.  So please fix
> this for volatiles as well as atomics.

Please open a new PR for this.