RFR: 8290892: C2: Intrinsify Reference.reachabilityFence [v19]

[Vladimir Ivanov]

On Thu, 30 Oct 2025 15:15:05 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Vladimir Ivanov has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix merge
>
> src/hotspot/share/opto/loopnode.cpp line 5119:
> 
>> 5117:   if (stop_early) {
>> 5118:     assert(do_expensive_nodes || do_optimize_reachability_fences, "why are we here?");
>> 5119:     if (do_optimize_reachability_fences && optimize_reachability_fences()) {
> 
> Can you explain why you call `optimize_reachability_fences` here and also below?

The intention is to optimize RF nodes irrespective of whether loop optimizations are performed or not. (It mimics similar logic for expensive nodes.)

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PR Review Comment: https://git.openjdk.org/jdk/pull/25315#discussion_r2488049270