On Fri, Feb 07, 2014 at 10:02:16AM -0800, Paul E. McKenney wrote: > As near as I can tell, compiler writers hate the idea of prohibiting > speculative-store optimizations because it requires them to introduce > both control and data dependency tracking into their compilers. Many of > them seem to hate dependency tracking with a purple passion. At least, > such a hatred would go a long way towards explaining the incomplete > and high-overhead implementations of memory_order_consume, the long > and successful use of idioms based on the memory_order_consume pattern > notwithstanding [*]. ;-)
Just tell them that because the hardware provides control dependencies we actually use and rely on them. Not that I expect they care too much what we do, given the current state of things.
