RFR: 8252848: Optimize small primitive arrayCopy operations through partial inlining using AVX-512 masked instructions [v3]

[Jatin Bhateja]

On Fri, 16 Oct 2020 14:53:32 GMT, Nils Eliasson <neliasso at openjdk.org> wrote:

>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Replacing explicit type checks with existing type checking routines
>
> src/hotspot/share/opto/cfgnode.cpp line 436:
> 
>> 434:   Node* rep_node = NULL;
>> 435:   PhaseIterGVN *igvn = phase->is_IterGVN();
>> 436:   if (in(1)->is_top() && !in(2)->is_top()) {
> 
> The Phi-nodes for loops are always normalized - in(1) will be loop-entry and in(2) is the backedge. So if in(1) is top - in(2) will be a self loop.

Yes, loop self loop check is no longer needed, removed associated phi disintegration logic also, there was  a problem with the inputs connection exit_region (convergence region after partially in-lined fast path region and stub call slow path region) which has been fixed, it was maligning the graph shape.

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PR: https://git.openjdk.java.net/jdk/pull/302