On 12/05/2014 09:49 PM, Martin Buchholz wrote: > The actual implementations of storestore (see below) seem to > universally give you the stronger ::release barrier, and it seems > likely that hotspot engineers are implicitly relying on that, that > some uses of ::storestore in the hotspot sources are bugs (should be > ::release instead) and that there is very little potential performance > benefit from using ::storestore instead of ::release, precisely > because the additional loadstore barrier is very close to free on all > current hardware.
That's not really true for ARM, where the additional loadstore requires a full barrier. There is a good use for a storestore, which is when zeroing a newly-created object. Andrew.
