RFR: 8325589: C2 SuperWord refactoring: create VLoopAnalyzer with Submodules [v3]

[Emanuel Peter]

On Wed, 14 Feb 2024 15:31:40 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> Emanuel Peter has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains eight commits:
>> 
>>  - manual merge
>>  - move _loop_or_ctrl from ResouceArena, bc ResourceMark in SuperWord::dependence_graph
>>  - remove some comments
>>  - VLoopTypes
>>  - VLoopBody
>>  - VLoopMemorySlices
>>  - VLoopReductions
>>  - 8325589
>
> src/hotspot/share/opto/superword.hpp line 235:
> 
>> 233:   CountedLoopNode* cl()                 const { return vloop().cl(); }
>> 234:   PhiNode* iv()                         const { return vloop().iv(); }
>> 235:   int iv_stride()                       const { return cl()->stride_con(); }
> 
> Could these also be field? You access these quite a lot but only inside this class and they seem to be constant.

I aready did this in a previous PR. If we think it is important to cache these values for performance, then we can do that in a future RFE.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17800#discussion_r1489705877