RFR (S) 8153792: EA: assert(ptn->as_LocalVar()->edge_count() > 0) failed: sanity when compiling compareAndExchange

[Paul Sandoz]

> On 12 May 2016, at 00:16, Aleksey Shipilev <aleksey.shipilev at oracle.com> wrote:
> 
> Hi,
> 
> Please review the bugfix for the EA assert failure when compiling new
> compareAndExchange intrinsics:
>  https://bugs.openjdk.java.net/browse/JDK-8153792
> 
> The bug is caused by the initial VarHandles change in the EA, and is
> actually a simple overlook: Op_CompareAndExchange* were added at the
> same switch case as Op_GetAndSet* (since they are similar), but the
> condition within the case itself was not changed. So, EA misses an edge
> from the load, and complains.
> 
> Easy fix:
>  http://cr.openjdk.java.net/~shade/8153792/webrev.01/
> 
> Testing: local Linux x86/fastdebug and failing test; RBT (hs-comp-tier0)
> 

+1

Paul.
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