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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: Wed, 25 Jan 2012 15:43:51 +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 #10 from David Edelsohn <dje at gcc dot gnu.org> 2012-01-25 15:43:51 UTC ---
> All that has to be done is replace the two __sync_fetch_and_add(...) with
> __atomic_fetch_add(.., __ATOMIC_ACQ_REL) in atomicity.h isn't it?
In src/libstdc++-v3/include/ext/atomicity.h and in
src/libstdc++-v3/config/cpu/generic/atomicity_builtins/atomicity.h