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| author | Jakub Jelinek <jakub@redhat.com> | 2012-01-27 21:26:03 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2012-01-27 21:26:03 +0100 |
| commit | 7dcbaaa984509967baf669a2e9888098960bfa9a (patch) | |
| tree | 5b7db7f79034ddfe2f779404f6d0f19901311e42 /libstdc++-v3/include | |
| parent | 8c6cb782a355e540036b38f8124a1870612c4950 (diff) | |
| download | gcc-7dcbaaa984509967baf669a2e9888098960bfa9a.zip gcc-7dcbaaa984509967baf669a2e9888098960bfa9a.tar.gz gcc-7dcbaaa984509967baf669a2e9888098960bfa9a.tar.bz2 | |
re PR libstdc++/51798 (libstdc++ atomicity performance regression due to __sync_fetch_and_add)
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.
From-SVN: r183644
Diffstat (limited to 'libstdc++-v3/include')
| -rw-r--r-- | libstdc++-v3/include/ext/atomicity.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libstdc++-v3/include/ext/atomicity.h b/libstdc++-v3/include/ext/atomicity.h index c63b1d4..c603063 100644 --- a/libstdc++-v3/include/ext/atomicity.h +++ b/libstdc++-v3/include/ext/atomicity.h @@ -1,6 +1,6 @@ // Support for atomic operations -*- C++ -*- -// Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010, 2011 +// Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010, 2011, 2012 // Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free @@ -45,11 +45,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION #ifdef _GLIBCXX_ATOMIC_BUILTINS static inline _Atomic_word __exchange_and_add(volatile _Atomic_word* __mem, int __val) - { return __sync_fetch_and_add(__mem, __val); } + { return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); } static inline void __atomic_add(volatile _Atomic_word* __mem, int __val) - { __sync_fetch_and_add(__mem, __val); } + { __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); } #else _Atomic_word __attribute__ ((__unused__)) |