https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59767
--- Comment #6 from Andrew Macleod <amacleod at redhat dot com> --- The standard doesn't define what machines should generate what code. It defines terms for observing effects that need to be adhered to. Their machine model was created over a few years during the early stages of the memory model to help observe and test those effects. To the best of our knowledge we think the results from this model are an efficient and correct implementation within the standards definition. If you can provide a test case which demonstrates that this is not a correct implementation based on observable effects (ie the load is observed out of order somewhere), then we'd look at fixing it in GCC. If you want to discuss whether parts are or aren't compliant without a test case that fails, then you should contact the authors with your questions since they can give you a far better answer than I ever could.
