[Bug target/55947] non constant memory models lose HLE qualifiers

[andi-gcc at firstfloor dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55947

--- Comment #3 from Andi Kleen <andi-gcc at firstfloor dot org> 2013-03-13 13:49:10 UTC ---
It was pointed out to me that atomic triggers this with, when compiled with no
optimization. For HLE wrong hints would be generated.


bool test_and_set(memory_order __m = memory_order_seq_cst) noexcept
{

      return __atomic_test_and_set (&_M_i, __m);

}

bool foo(std::atomic_flag fl) {

    return fl.test_and_set(std::memory_order_relaxed);

}