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[Bug libstdc++/51798] [4.7 regression] libstdc++ atomicity performance regression due to __sync_fetch_and_add
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 27 Jan 2012 20:26:12 +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 #24 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-27 20:26:12 UTC ---
Author: jakub
Date: Fri Jan 27 20:26:03 2012
New Revision: 183644
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=183644
Log:
PR libstdc++/51798
* config/cpu/generic/atomicity_builtins/atomicity.h
(__exchange_and_add, __atomic_add): Use __atomic_fetch_add
with __ATOMIC_ACQ_REL semantics instead of __sync_fetch_and_add.
* include/ext/atomicity.h (__exchange_and_add, __atomic_add):
Likewise.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/config/cpu/generic/atomicity_builtins/atomicity.h
trunk/libstdc++-v3/include/ext/atomicity.h