More on memory barriers
dl at cs.oswego.edu
Wed Sep 17 11:16:36 UTC 2014
On 09/17/2014 06:31 AM, Andrew Haley wrote:
> On 09/16/2014 08:40 AM, Andrew Haley wrote:
>> On 15/09/14 17:20, Vitaly Davidovich wrote:
>>> Looking at hg history, MemBarStoreStore was added a few years ago, whereas
>>> the code in question is much older. The comments in the changelist adding
>>> MemBarStoreStore seem to indicate it was done to address a specific issue,
>>> and my guess is that it wasn't "retrofitted" into all possible places.
>> That sounds plausible. I'll change this to a StoreStore in the AArch64
>> port and do some testing.
> Bah, that doesn't work. Escape analysis assumes that a StoreStore
> is only used in certain contexts. Back to the drawing board.
The setup for StoreStore seems suspicious. I believe that this could
only work in C2 if done in the way I mentioned: StoreStore must be
handled identically to Release by c2, but possibly more cheaply
matched. Can StoreStore be reworked as a subtype or property of
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