On Fri, Feb 07, 2014 at 08:44:05AM +0100, Peter Zijlstra wrote: > On Thu, Feb 06, 2014 at 08:20:51PM -0800, Paul E. McKenney wrote: > > Hopefully some discussion of out-of-thin-air values as well. > > Yes, absolutely shoot store speculation in the head already. Then drive > a wooden stake through its hart. > > C11/C++11 should not be allowed to claim itself a memory model until that > is sorted.
There actually is a proposal being put forward, but it might not make ARM and Power people happy because it involves adding a compare, a branch, and an ISB/isync after every relaxed load... Me, I agree with you, much preferring the no-store-speculation approach. Thanx, Paul