RFR(XS): 8150727: [JVMCI] add LoadLoad to the implicit memory barriers on AMD64

[Tom Rodriguez]

It shouldn’t.  A MembarNode is still built since we have to order the memory operations.  The implicit barriers stuff just means we don’t need extra instructions to ensure the ordering beyond issuing them in the right order.

tom

> On Feb 26, 2016, at 10:32 AM, Christian Thalinger <christian.thalinger at oracle.com> wrote:
> 
> I’m assuming this doesn’t change the generated code at all.  Does it reduce the number of nodes in compiler graphs?
> 
>> On Feb 26, 2016, at 4:47 AM, Roland Schatz <roland.schatz at oracle.com <mailto:roland.schatz at oracle.com>> wrote:
>> 
>> Hi,
>> 
>> Please review and integrate this small fix:
>> http://cr.openjdk.java.net/~rschatz/JDK-8150727/webrev.00/ <http://cr.openjdk.java.net/~rschatz/JDK-8150727/webrev.00/>
>> https://bugs.openjdk.java.net/browse/JDK-8150727 <https://bugs.openjdk.java.net/browse/JDK-8150727>
>> 
>> It was contributed by Benoit Daloze (cc'ed), and lgtm (but I'm not a reviewer myself).
>> 
>> Thanks,
>> Roland
> 

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