When a non constant memory model is passed to __atomic_*
gcc falls back to seq_cst. This drops any HLE acquire or release bits.
This can happen when <atomic> is used with -O0
as the member functions are not always inlined then and the memory
argument passed in ends up being non-constant.
v2: Use _GLIBCXX_ALWAYS_INLINE
libstdc++-v3/:
2013-05-08 Andi Kleen <ak@linux.intel.com>
PR target/55947
* libstdc++-v3/include/bits/atomic_base.h
(_GLIBCXX_ALWAYS_INLINE): Add new macro.
(atomic_thread_fence, atomic_signal_fence, test_and_set,
clear, store, load, exchange, compare_exchange_weak)
compare_exchange_strong, fetch_add, fetch_sub, fetch_and,
fetch_or, fetch_xor): Mark _GLIBCXX_ALWAYS_INLINE.
From-SVN: r198733
a062bb4ba6