RFR: 8160821: VarHandle accesses are penalized when argument conversion is required [v9]

[Chen Liang]

On Wed, 10 Dec 2025 07:32:59 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 17 additional commits since the last revision:
>> 
>>  - Review
>>  - Merge branch 'master' of https://github.com/openjdk/jdk into fix/vh-adapt-cache
>>  - Bugs and verify loader leak
>>  - Try to avoid loader leak
>>  - Merge branch 'master' of https://github.com/openjdk/jdk into fix/vh-adapt-cache
>>  - Revert void special case removal due to C2 shortage causing TestZGCBarrierElision::testAtomicThenAtomicAnotherField failure
>>  - Test from Jorn
>>  - Copyright years
>>  - Fix problem identified by Jorn
>>  - Rollback getAndAdd for now
>>  - ... and 7 more: https://git.openjdk.org/jdk/compare/bdc0543f...d734e8a6
>
> test/hotspot/jtreg/compiler/c2/irTests/constantFold/VarHandleMismatchedTypeFold.java line 2:
> 
>> 1: /*
>> 2:  * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
> 
> We want to eventually migrate all tests from `c2/irTests` to more "topic based" directories, so it would be great if you already migrated them now, since you probably would know a better name/place now already ;)

What would be a good directory? I used `c2/irTests/constantFold` as a topic. Maybe you can find a more straightforward directory for constant folding verification.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28585#discussion_r2607162521