RFR: 8343685: C2 SuperWord: refactor VPointer with MemPointer [v4]

[Emanuel Peter]

On Mon, 13 Jan 2025 20:02:16 GMT, Vladimir Kozlov <kvn 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 116 commits:
>> 
>>  - copyright 2025
>>  - Merge branch 'master' into JDK-8343685-VPointer-MemPointer
>>  - manual merge
>>  - fix printing
>>  - rename
>>  - fix up print
>>  - add TestEquivalentInvariants.java
>>  - improve documentation
>>  - hide parser via delegation
>>  - Merge branch 'master' into JDK-8343685-VPointer-MemPointer
>>  - ... and 106 more: https://git.openjdk.org/jdk/compare/84e6432b...b64f9295
>
> src/hotspot/share/opto/mempointer.hpp line 620:
> 
>> 618: 
>> 619: private:
>> 620:   NOT_PRODUCT( const TraceMemPointer& _trace; )
> 
> Why you prefer `_trace` to be first and not last?

Ah, I think in a previous version I needed the _trace while initializing other parts... but I don't any more.

Nice catch!

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PR Review Comment: https://git.openjdk.org/jdk/pull/21926#discussion_r1914319474