Re: [RFC][PATCH 0/5] arch: atomic rework

[Peter Zijlstra]

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.
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