RFR: 8342692: C2: long counted loop/long range checks: don't create loop-nest for short running loops [v20]

[Christian Hagedorn]

On Thu, 15 May 2025 15:26:34 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> src/hotspot/share/opto/loopnode.cpp line 1269:
>> 
>>> 1267:     }
>>> 1268: #endif
>>> 1269:     entry_control = head->skip_strip_mined()->in(LoopNode::EntryControl);
>> 
>> It looks like this line rather belongs to the `Predicate` on L1275? Might have been moved here by accident.
>
> I don't think that's the case. Predicates were added so `entry_control` needs to be refreshed.

You're right, I thought we need the skipping of strip mined loop below as well. But we don't have a strip mined loop for the long case - so all good.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21630#discussion_r2099725506