On 01/07/2018 07:20 PM, Bill Schmidt wrote: > Hi Richard, > > Unfortunately, I don't see any way that this will be useful for the ppc > targets. We don't > have a way to force resolution of a condition prior to continuing > speculation, so this > will just introduce another comparison that we would speculate past. For our > mitigation > we will have to introduce an instruction that halts all speculation at that > point, and place > it in front of all dangerous loads. I wish it were otherwise. So could you have an expander for __builtin_load_no_speculate that just emits the magic insn that halts all speculation and essentially ignores the additional stuff that __builtin_load_no_speculate might be able to do on other platforms?
jeff
