[Bug libstdc++/54861] std::atomic_signal_fence(std::memory_order_seq_cst) issues unnecessary mfence

[ozabluda at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54861



--- Comment #3 from Oleg Zabluda <ozabluda at gmail dot com> 2012-10-09 
18:48:56 UTC ---

I can confirm that this fixes it in gcc 4.7.0.