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[Bug libstdc++/51798] [4.7 regression] libstdc++ atomicity performance regression due to __sync_fetch_and_add
- From: "dje at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 26 Jan 2012 15:02:14 +0000
- Subject: [Bug libstdc++/51798] [4.7 regression] libstdc++ atomicity performance regression due to __sync_fetch_and_add
- Auto-submitted: auto-generated
- References: <bug-51798-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51798
--- Comment #13 from David Edelsohn <dje at gcc dot gnu.org> 2012-01-26 15:02:14 UTC ---
If libstdc++-v3 does not consistently use its own atomicity.h everywhere, then
it is even more broken. Any code that explicitly calls __sync_* in
libstdc++-v3 has introduced a performance regression.