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2011-11-07 Andrew MacLeod <amacleod@redhat.com> libstdc++-v3 * include/bits/atomic_base.h (atomic_thread_fence): Call builtin. (atomic_signal_fence): Call builtin. (atomic_flag::test_and_set): Call __atomic_exchange when it is lockfree, otherwise fall back to call __sync_lock_test_and_set. (atomic_flag::clear): Call __atomic_store when it is lockfree, otherwise fall back to call __sync_lock_release. gcc * doc/extend.texi: Docuemnt behaviour change for __atomic_exchange and __atomic_store. * optabs.c (expand_atomic_exchange): Expand to __sync_lock_test_and_set only when originated from that builtin. (expand_atomic_store): Expand to __sync_lock_release when originated from that builtin. * builtins.c (expand_builtin_sync_lock_test_and_set): Add flag that expand_atomic_exchange call originated from here. (expand_builtin_sync_lock_release): Add flag that expand_atomic_store call originated from here. (expand_builtin_atomic_exchange): Add origination flag. (expand_builtin_atomic_store): Add origination flag. * expr.h (expand_atomic_exchange, expand_atomic_store): Add boolean parameters to indicate implementation fall back options. From-SVN: r181111
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