[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);



}