[Bug middle-end/51766] [4.7 regression] sync_fetch_and_xxx atomicity

[dje at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51766

--- Comment #11 from David Edelsohn <dje at gcc dot gnu.org> 2012-01-10 18:33:56 UTC ---
Jonathan,

I understand that the new __atomic_* builtins provide that flexibility.

I also am pointing out that GCC followed Intel semantics and Intel chose
semantics to benefit them.  Why should GCC prefer and impose semantics that
advantage a particular architecture or vendor?

You can argue that the __sync_* definition is the playing field and the rule
and POWER has to deal with it.  And I am responding that the builtins were
implemented appropriate for POWER and now GCC has moved the goal post.