RFR: 8260473: [vector] ZGC: VectorReshape test produces incorrect results with ZGC enabled [v7]

[王超]

On Fri, 29 Jan 2021 16:42:05 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> src/hotspot/share/opto/vector.cpp line 419:
>> 
>>> 417:     Node* vec_field_ld;
>>> 418:     {
>>> 419:       DecoratorSet decorators = C2_READ_ACCESS | C2_CONTROL_DEPENDENT_LOAD | IN_HEAP;
>> 
>> C2_READ_ACCESS will be set by "bs->load_at" so you can skip that. 
>> MO_UNORDERED is missing. That corresponds to "MemNode::unordered" in the original code.
>
> `C2_CONTROL_DEPENDENT_LOAD` is also redundant (though original code does that): it's just a plain load from a final instance field).

Fixed in the new pr: https://github.com/openjdk/jdk16/pull/139

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PR: https://git.openjdk.java.net/jdk/pull/2253